CN113574417A - Detection device, detection system and detection method - Google Patents

Abstract

A detection apparatus for detecting an object includes a housing having an inner face with a reflectance equal to or lower than a certain value; an emitter configured to emit infrared rays into the housing; a sensor configured to detect infrared rays; and one or more processors configured to adjust the intensity of the reflected infrared rays according to the detection result of the sensor.

Description

Detection device, detection system and detection method

Technical Field

The invention relates to an apparatus, a system and a method for detecting an object.

Background

As a technique for detecting an object, a detection technique using infrared rays (also referred to as infrared light) is known. The detection method using infrared rays includes a method of detecting an object according to whether infrared light is blocked by the object passing between a light emitting portion and a light receiving portion; and a method of detecting an object based on whether or not the amount of light received by the light receiving portion changes due to reflection of infrared rays emitted by the light emitting portion at the object (for example, refer to patent documents 1 and 2).

CITATION LIST

Patent document

[ patent document 1 ] JP-2727293-B (JP-1995-123894-A)

[ patent document 2 ] JP-2017-192321-A

Disclosure of Invention

Technical problem

In the former method, however, the object cannot be detected unless the object passes through the infrared ray passing path, and therefore, it is necessary to provide a plurality of infrared ray paths, which require a plurality of sets of light emitting portions and light receiving portions,

therefore, the former method has a disadvantage of increased cost.

On the other hand, the latter method is based on observing the change in the amount of light returned after diffused reflection in a space, and only requires one set of a light emitting portion and a light receiving portion. Pests as objects exist in various sizes in the growing process, and therefore, it is necessary to increase the ratio of the maximum value to the minimum value of the change in the amount of light (dynamic range) in order to distinguish the pests of various sizes. However, the latter method has a disadvantage in that, when the dynamic range is increased, it is impossible to distinguish whether a small change in the amount of light is from the size of the pest or from an error, resulting in an increase in detection error.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus, a system, and a method that can be provided at low cost and can reduce detection errors.

Means for solving the problems

The disclosed embodiments include a detection apparatus for detecting an object, the detection apparatus including a housing having an inner face with a reflectivity equal to or lower than a certain value; an emitter configured to emit infrared rays into the housing; a sensor configured to detect infrared rays; and one or more processors configured to adjust the intensity of the reflected infrared rays according to the detection result of the sensor.

Effects of the invention

According to one or more embodiments of the present invention, an apparatus, system, and method are provided at low cost and capable of reducing detection errors.

Drawings

The drawings are intended to depict example embodiments of the disclosure, and should not be interpreted as limiting the scope thereof. The drawings are not to be considered as drawn to scale unless explicitly indicated. Also, like or similar reference characters designate like or similar components throughout the several views.

Fig. 1 is a graph illustrating a relationship between a detected value of infrared rays and temperature and time according to an embodiment of the present invention.

Fig. 2 is a diagram of one example of an appearance of a detection apparatus according to one embodiment of the present disclosure.

FIG. 3 is a perspective view of one example of the interior of a detection device according to one embodiment of the present disclosure.

Fig. 4 is a plan view of an example of the interior of a detection device according to one embodiment of the present disclosure.

Fig. 5 is a cross-sectional view of an example of a detection device according to an embodiment of the present disclosure.

Fig. 6 is a diagram illustrating one example of a hardware configuration of a detection apparatus according to one embodiment of the present disclosure.

Fig. 7 is a block diagram illustrating one example of a functional configuration of a detection apparatus according to one embodiment of the present disclosure.

Fig. 8 is a diagram illustrating a configuration example of a transmitting device included in a detection apparatus according to an embodiment of the present disclosure.

Fig. 9 is a diagram illustrating a configuration example of a detection apparatus included in a detection apparatus according to an embodiment of the present disclosure.

Fig. 10 is a flowchart illustrating an example of an initial calibration process performed by a detection device according to an embodiment of the present disclosure.

Fig. 11 is a diagram illustrating an example of a table for managing calibration values after an initial calibration process according to an embodiment of the present disclosure.

Fig. 12 is a diagram in which, in the characteristic curve on the light receiving side, the shape of the characteristic curve changes when the gain changes in different ranges, according to an embodiment of the present invention.

FIG. 13 is a flow chart illustrating a pre-processing flow according to an embodiment of the present invention.

Fig. 14 is a flowchart illustrating an example of the calibration process and the detection process performed at regular time intervals according to an embodiment of the present disclosure.

Fig. 15 is a diagram illustrating an example of a table for managing calibration values to be referred to in the frequency selection process according to an embodiment of the present disclosure.

Fig. 16 is a flowchart illustrating an example of a process performed by the detection apparatus for shifting the temporary frequency to the determination frequency according to an embodiment of the present disclosure.

Fig. 17 is a diagram illustrating an example of a table that manages calibration values when shifting a temporary frequency to a determined frequency according to an embodiment of the present disclosure.

FIG. 18 is a perspective view of another example of the interior of a detection device according to one embodiment of the present disclosure.

Detailed Description

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In describing the embodiments illustrated in the drawings, specific terminology is employed for the sake of clarity. However, the disclosure of the present specification is not intended to be limited to the specific terminology so selected, and it is to be understood that each specific element includes all technical equivalents that operate in a similar manner and achieve a similar result with a similar function.

The detection device of the present invention is a device for detecting an object by infrared rays, and is a device for detecting insect pests in a narrow space close to a closed space such as an insect pest trap by infrared rays. In the embodiment of the present invention, the object to be detected may be a cockroach, but the object to be detected is not limited to this example.

The detecting device emits infrared rays from the emitting means, captures a change between the infrared rays reflected back in the space and the infrared rays reflected back from the insect pests in a state where the insect pests are captured, thereby detecting the captured state of the insect pests.

Here, the disadvantages associated with detection devices employing this approach are described. It is necessary to adjust the intensity of the reflected infrared light, i.e., the amount of the reflected infrared light (the amount of the infrared light received after being reflected back), so that the range of the difference between the case where the insect pest is not caught and the case where the insect pest has been caught can be detected falls within the dynamic range of the infrared light detecting apparatus. Especially insect pests are present during growth in the range from a few millimetres to a few centimetres in size, which requires a sufficiently large dynamic range to detect such size differences.

On the other hand, in the case of detecting small insect pests of several millimeters in size, the variation in the light amount is small, and therefore, when the dynamic range is increased, it is impossible to distinguish whether the small variation in the light amount is caused by capturing insect pests or is caused by an error, and the detection error increases.

Examples of the errors include an error in molding of a housing forming a space for catching insect pests, a characteristic error of the emitting means and the detecting means, a mounting error of the emitting means and the detecting means, an accuracy error of a control means (e.g., an electronic circuit of a central processing unit CPU) controlling the emitting means and the detecting means, and a change in the amount of light due to a change in temperature. Among these errors, other than the error due to temperature change, are static errors inherent to the device.

A correction may be made before the detection process is performed to reduce static errors and improve the accuracy of detecting insect pests.

In general, in the case of using a Light Emitting Diode (LED) as a light source of a light emitting device, the amount of light decreases with an increase in temperature, and the amount of light increases with a decrease in temperature, which is a characteristic of the LED. In addition, the output values of the electronic circuit and the detection device also vary due to a change in temperature. Therefore, the temperature characteristics of the entire apparatus need to be considered. The temperature dynamic changes, the change in the amount of light due to the temperature change is sufficiently larger than the change in the amount of light required to detect insect pests of several millimeters in size. Therefore, in the case where correction is performed only before the detection processing is performed, many detection errors occur, as in the case of the above-described static error, and insect pests cannot be accurately detected.

Fig. 1 is a graph showing a relationship between a temperature and time of a detection value of infrared rays as an actual test result, and the test is started at an ambient temperature of 20 ℃, adjustment (calibration) is performed so as to reduce a static error inherent in the device, and a light amount of reflected infrared rays (reflected infrared ray received light amount) as the detection value is set to a threshold value (0).

When the test is started, the temperature will change over time. In interval 1, the temperature gradually decreases with the fluctuation. The amount of light increases as the temperature decreases. Once the temperature returns to 20 ℃, the temperature then gradually rises with the fluctuations during interval 2. When the temperature is higher than 20 ℃, the amount of light is equal to or lower than the threshold. In fig. 1, even if the light amount is a negative value, the value of the light amount is shown as 0. Therefore, it is unknown whether the light amount actually has a negative value.

When the temperature reaches 23 c (point indicated with a in the figure), an object of a size of a few millimeters is let in. In the 3 rd section, the object is allowed to enter and remain as it is without changing the position of the object. When an object enters, the temperature fluctuates greatly. However, the fluctuation gradually decreases and the temperature decreases.

In fig. 1, when the temperature is, for example, 23 ℃, that is, when the temperature is higher than 20 ℃, the light amount is equal to or lower than the threshold value. On the other hand, when the temperature is decreased to about 20 ℃, the light amount is increased to reach an environment close to the environment where calibration is performed. This is because when the temperature is higher than the calibration temperature (i.e., 20 ℃), the amount of light emitted from the light source of the light-emitting device decreases, and thus the amount of light reflected back from the object also decreases. Therefore, even if an object is let in, the object cannot be detected unless the temperature returns to the calibration temperature of 20 ℃.

For these reasons, before the detection process is performed, it is necessary to perform initial calibration for reducing static errors to obtain calibration parameters for adjusting the light amount for each temperature.

The detection device according to the present invention has a function of adjusting the amount of light reflected back, with which an initial calibration can be performed, obtaining a calibration parameter for each temperature. As a result, object detection errors due to environmental changes or environmental errors can be reduced. In addition, a single group of emitting means and detecting means corresponding to the conventional light emitting portion and light receiving portion, respectively, can be provided, so that the detecting apparatus can be provided at low cost.

The detection apparatus of the present embodiment is explained in detail with reference to the drawings. Fig. 2 is an example of the appearance of the detection apparatus. The detection device 10 comprises a housing 11. The housing 11 includes an object detection portion and a device portion 13. Here, the detection apparatus of the present embodiment is described as a device including the object detection section 12 and the device section 13, but the detection apparatus of the present embodiment is not limited to such a device. For example, a detection system including a plurality of devices is provided by separating a part or all of the device unit 13 into one or more devices.

When the detection system includes a plurality of devices, the devices are not limited to being directly connected to each other by cables or the like, and may be connected through one or more networks. Further, the network may be a wired network or a wireless network.

The object detection unit 12 and the device unit 13 are each box-shaped and have a space therein. The object detection unit 12 and the device unit 13 are adjacent to each other and separated by a partition 14. The internal space of the object detection unit 12 is a detection space, and the object detection unit 12 has a trapezoidal external shape. The device portion 13 has a rectangular parallelepiped outer shape. These shapes are examples, and the shapes of the object detection section 12 and the device section 13 are not limited to these examples.

The object detection unit 12 includes a bottom wall 12a, an upper wall 12b, and side walls 12c to 12 e. The detection space is an internal space surrounded by the bottom wall 12a, the upper wall 12b, the side walls 12c to 12e, and the partition wall 14.

When the detection device 10 is disposed on the disposition surface, the bottom wall 12a is located at the bottom in contact with the disposition surface. The upper wall 12b is disposed away from the bottom wall 12a, above the bottom wall 12a, so that the upper wall 12b faces the bottom wall 12 a. The side walls 12c to 12e are continuous with the bottom wall 12a and the upper wall 12b, and the side walls 12c to 12e and the partition wall 14 are provided around the detection space. The side walls 12c to 12e are inclined so that the detection space is gradually narrowed from the bottom wall 12a to the upper wall 12 b.

The side walls 12c to 12e are provided with an opening 15 at a lower portion continuous with the bottom wall 12 a. The opening 15 is elongated (slit-shaped) extending along the edge of the bottom wall 12 a. The opening is an entrance through which pests enter the internal detection space from the outside.

The housing 11 is made of a non-metallic material and has a black color so that the reflectance of infrared rays on the inner face facing the detection space is equal to or lower than a certain value, for example, 0.1%. For example, the material includes plastics, rubber, and ceramics, and plastics such as acrylonitrile-butadiene-styrene copolymer resin (ABS resin) can enable weight reduction and low-cost production. The reflectance is a ratio of a luminous flux of reflected light with respect to a luminous flux of incident light on a specific face. The case 11 may be made of a material having a reflectance exceeding 0.1%, and the inner face may be covered with a plate, sheet, film, paint, or the like having a reflectance of 0.1% or less. The color is preferably black to reduce reflectance, but may also be dark brown or navy.

Fig. 3 is a perspective view of an example of the inside of the detection apparatus. Fig. 4 is a plan view of an example of the inside of the detection apparatus. Fig. 3 is a perspective view of the inside as viewed from the upper wall 12b side. Fig. 4 is a plan view of the inside as viewed from the bottom wall 12a side. In these figures, the directions are defined as follows. The shorter side direction of the bottom wall 12a is defined as the x-axis direction. The longitudinal direction of the bottom wall 12a is defined as the y-axis direction. The upward direction of the bottom wall 12a, i.e., the direction from the bottom wall 12a to the upper wall 12b, is defined as the z-axis direction. Fig. 5 is a sectional view of the housing 11 taken along the y-axis direction.

The object detection unit 12 includes a ridge portion 12f protruding from the inner surface of the bottom wall 12a in the z-axis direction. The ridge portion 12f is made of the same material as the housing 11. The ridge portion 12f may be made of a different material from the housing 11, and may be integrated with the bottom wall 12 a. The ridge portion 12f extends in a band-like shape along three openings 15 provided in the vicinity of the openings 15, the openings 15 being provided along the edge of the bottom wall 12 a. This is to prevent infrared rays from radiating outward through the opening 15, and further, to absorb infrared rays radiated inward from the outside through the opening 15.

The ridge portion 12f is U-shaped when viewed from above, but is not limited thereto. Like the case 11, the raised portion 12f may be made of a material having an infrared reflectance of 0.1% or less, or the raised portion 12f may be made of a material having a reflectance exceeding 0.1%, and the surface thereof may be covered with a plate, sheet, film, paint, or the like having a reflectance of 0.1% or less. The raised portion 12f may be colored black, dark brown, navy blue, or the like, as in the case 11.

For example, the distance between the opening 15 and the raised portion 12f and the protruding dimension of the raised portion 12f in the z-axis direction may be determined in accordance with the shape and size of the opening 15 and the above-described desired preventive effect.

The device section 13 includes a control board 16 and a power supply 17, the control board 16 controls the entire inspection apparatus 10, and the power supply 17 supplies power necessary for the operation of the control board 16.

The control board 16 is supported by the bottom wall 12a by the support legs 13a, and is disposed between the upper wall 12b and the bottom wall 12a of the housing 11. The control substrate 16 includes a plate-shaped protrusion 13b, and the protrusion 13b extends to the detection space 12g in the y-axis direction through the partition wall 14. The projection 13b has an upper surface provided with the emitting means 18 and a lower surface provided with the detecting means 19.

The emitting means 18 comprises an infrared LED and a prism. The infrared LED emits infrared rays having a wavelength range of approximately 700 to 2500nm in the y-axis direction. The optical axis of the infrared LED may be parallel to the y-axis direction, or may be inclined at a predetermined angle with respect to the y-axis direction. The transmitting device 18 is an example of a transmitter.

The prism is disposed on an optical axis of the infrared LED such that the prism and the infrared LED are spaced apart, the prism having a semi-cylindrical side such that incident infrared rays are radially diffused along an x-y plane. As a result, infrared rays are radiated into the entire detection space 12 g.

The detection device 19 receives the infrared rays emitted from the emission device 18, reflected from the side walls 12c to 12e, etc., and returned to the detection device 19, and then the detection device 19 converts the received infrared rays into a signal indicating the intensity of the received infrared rays and outputs the signal, the detection device 19 being one example of a sensor.

Fig. 6 is a diagram showing an example of a hardware configuration of the detection apparatus 10, and the detection apparatus 10 includes, as hardware, a transmission device 18, a detection device 19, a power supply 17, a control device 20, a memory 21, an input/output device 22, and a temperature measurement device 23.

The control device 20 is realized by a CPU or the like, and the control device 20 executes a program stored in the memory 21 to perform overall control of the detection apparatus 10, initial calibration processing, detection processing described later, and the like. The control device 20 is an example of one or more processors. The memory 21 functions as a storage unit that stores data such as tables and detection results described below in addition to programs. The power supply 17 is a battery or the like, and supplies power to the control device 20. The input/output device 22 is a communication interface I/F or the like, and controls communication with an external server or the like. The temperature measuring device 23 is a temperature sensor or the like, and measures the temperature inside the housing 11 (detection space). The control device 20 is not limited to a device that reads out a program from the memory 21 and executes the program of control or the like, and the control device 20 may include one or more circuits dedicated to control or respective processes.

Fig. 7 is a block diagram showing one example of the functional configuration of the detection apparatus. The detection apparatus 10 includes an operation control unit 25, a size detection unit 26, a timer unit 27, an adjustment unit 28, and a temperature correction control unit 29 as functional units realized by the control device 20.

The operation control unit 25 controls the overall operation of the detection apparatus 10. The operation control unit 25 supplies the electric power supplied from the power supply 17 to the respective components, and controls, for example, the operation of the light emitting device 18 for turning on and off the light source and the detection operation of the detection device 19. The operation control unit 25 determines whether or not there is a pest based on the infrared light receiving signal output from the detection device 19. When a pest enters the housing 11, infrared reflected light from the pest is received, and an output signal changes. The operation control unit 25 judges whether or not there is a pest based on the presence or absence of the change.

The size detection unit 26 detects the size of the insect pest existing in the housing 11 based on the light reception signal of the infrared ray output from the detection device 19. The size detecting unit 26 identifies the size of the entering insect pest based on the difference between the signals emitted before and after the entry of the insect pest. The size detecting unit 26 holds a table or the like so as to detect the size corresponding to the difference between the signals, and therefore, the size detecting unit 26 can calculate the size of the insect pest using the table or the like. The size detection unit 26 performs a process of detecting the size only in a case where the operation control unit 25 detects the insect pest.

The timer unit 27 measures time and outputs the measured time. The operation control unit 25 instructs the temperature measuring unit 23 to measure the current temperature in the housing 11 according to the measurement time output from the timer unit 27. The operation control unit 25 may be configured as follows: the operation control unit 25 causes the temperature measuring unit 23 to continuously monitor the temperature and outputs a signal when the temperature reaches a prescribed value, and the operation control unit 25 thus receives a notification that the temperature reaches the prescribed value.

The adjustment unit 28 performs investigation to obtain a calibration parameter (calibration value) for adjusting the light receiving amount of infrared rays with respect to temperature as needed in response to receiving an instruction from the operation control unit 25.

The temperature correction control unit 29 determines whether the calibration value obtained by the adjustment unit 28 is valid or not based on the temperature output from the temperature measurement device 23. If the adjustment unit 28 finds the calibration value in a state where no pest is present in the housing 11, the temperature correction control unit 29 determines that the calibration value is valid, and therefore, the temperature correction control unit 29 causes the memory 21 to store the calibration value as the determined calibration value in association with the temperature output from the temperature measurement device 23. When the memory 21 does not store the calibration value for determining the temperature output from the temperature measuring device 23, the temperature correction control unit 29 stores the calibration value checked by the adjustment unit 28 in the memory 21 as a temporary calibration value in association with the temperature. The temporary calibration value is a calibration value at which the validity cannot be determined.

The temperature correction control unit 29 notifies the operation control unit 25 of the decided calibration value and reference value (to be described below) stored in association with the temperature output from the temperature measuring device 23. The operation control unit 25 sets the notified calibration value, controls the operation of the transmitting device 18 or the detecting device 19 to perform the detection process. The temperature correction control unit 29 changes the temporary calibration value stored in the memory 21 to the decided calibration value according to the result of the detection processing.

Fig. 8 shows a configuration example of the transmitting device 18. The emitting device 18 includes a resistor 30, an infrared LED31, and a switching element 32. The resistor 30 is a current limiting resistor for preventing an overcurrent from flowing into the infrared LED 31. The infrared LED31 is used as a light source, and emits infrared rays upon receiving a current supply.

The switching element 32 functions as a switch, and the switching element 32 turns on and off the switch to control a current flowing to the infrared LED31 or not flowing to the infrared LED 31. The switching element 32 is, for example, an n-Metal Oxide Semiconductor Field Effect Transistor (MOSFET) having three regions called a gate, a drain, and a source, and when a voltage applied between the gate and the source exceeds a threshold, a current flows from the drain to the source to realize a state where the switch is turned on. When the voltage is below the threshold, current flows from the drain to the source to achieve a switch off state. An infrared LED31 is connected to the drain side of the n-MOSFET, and when the switch is on, the infrared LED31 lights up, and when the switch is off, the infrared LED31 lights out.

The emitting device 18 modulates the emitted infrared rays to distinguish the emitted infrared rays from the infrared rays of the natural world. To achieve modulation, a pulse modulated voltage is applied to the gate of the n-MOSFET. For example, a pulse modulated voltage having a frequency of 38kHz is applied to the gate.

Fig. 9 shows a configuration example of the detection device 19, and the detection device 19 includes a PIN photodiode 33, an I-V converter 34, an amplifier 35, a band-limiting filter 36, and a demodulator 37.

The PIN photodiode 33 has a high-speed response characteristic, and converts modulated infrared rays into electric current. The conversion of infrared rays into electric current is not limited to the PIN photodiode 33, and a PN photodiode, an avalanche photodiode (APD photodiode), or the like may be used instead of the PIN photodiode.

The I-V converter 34 converts the current from the PIN photodiode 33 into a voltage. The amplifier 35 amplifies the voltage as a signal with a predetermined amplification factor. The band-limiting filter 36 adjusts the center frequency to a modulation frequency of, for example, 38kHz, and therefore, the band-limiting filter 36 passes only the signal of this frequency band, while attenuating other signals. The demodulator 37 converts the signal passed through the band-limiting filter 36 into an output signal.

The infrared rays emitted from the emitting device 18 are partially absorbed in the housing 11, partially leaked out of the housing 11, and partially reflected to reach the detecting device 19. The detection device 19 detects a change in the inside of the housing 11 based on a change in the amount of received reflected infrared light. As a method of detecting this change, the following method may be employed: for example, the reflected light in the initial state is kept constant, the value of the amount of received light at this time is set as a threshold value, and when the value of the amount of received light exceeds the threshold value, it is determined that an object such as insect pest has entered the housing 11, and reflection from the object occurs. The above method is an example, and the method of detecting the change is not limited to this example. Next, a detailed description will be provided assuming that the above-described method is employed.

In order to implement this method, it is necessary to adjust the amount of light received that varies between devices to a threshold value of an initial state. The light receiving amount may be adjusted on the infrared ray irradiation side, or may be adjusted on the light receiving side.

As examples of a method of adjusting the light receiving amount on the irradiation side, a method of adjusting the amount of current supplied to the infrared LED31, and a method of changing the modulation frequency of 38kHz of the voltage (rectangular wave) applied to the gate of the switching element 32 can be cited. The latter varies with the amount of light according to the filter characteristics of the band-limiting filter 36 of the detection device 19. Further, a method of changing the pulse width of the voltage (rectangular wave) applied to the gate of the switching element 32 to adjust the pulse demodulation (pulse detection) sensitivity on the light receiving side may also be taken as an example of a method of adjusting the light receiving amount on the irradiation side.

The method of adjusting the amplification factor in the amplifier 35 of the detection device 19 can be used as an example of a method of adjusting the light receiving amount on the light receiving side. These methods are examples, and therefore, the method of adjusting the light receiving amount is not limited to these methods. In addition, when the modulation frequency changing method is adopted, the modulation frequency changing method can be easily realized by digital control.

Fig. 10 is a flowchart showing an example of the initial correction processing. The initial correction processing is performed at the time of power-on or initialization of the detection apparatus 10, because it is highly likely that no pest enters the housing 11 when the power-on or initialization is performed, and therefore it can be considered that the housing 11 is in a state where no pest enters.

The initial calibration process starts at step S100, and at step S101, the detection device 10 is kept on standby for a while until the characteristics of the sensor or the like used as the temperature measurement device 23 are stabilized. Whether the period of time has elapsed is judged based on the time measured by the timer unit 27. Judged by the operation control unit 25.

After a predetermined time has elapsed, the flow proceeds to step S102, and the operation control unit 25 instructs the temperature measuring device 23 to measure the temperature, and the temperature measuring device 23 receives the instruction to measure the current temperature. The temperature measured at this time was regarded as the temperature at the time of initial calibration. For convenience of description, it is assumed that the measured temperature is 20 ℃.

After the temperature measurement, the calibration process is started. In the calibration process, in step S103, the adjustment unit 28 sets the modulation frequency to an initial value so that the frequency is initialized. The modulation frequency is maximized at the modulation frequency of 38kHz, that is, the frequency at which the maximum amount of received light is obtained, according to the characteristics of the band-limiting filter 36 of the detection device 19. According to the characteristics of the band-limiting filter 36, when the modulation frequency is higher or lower than 38kHz, the amount of received light decreases from the maximum amount of received light. Therefore, after the calibration process, the light receiving amount becomes a threshold at two frequencies, that is, a frequency equal to or higher than 38kHz and a frequency lower than 38 kHz. Thus, the initial value of the frequency may be 38kHz, or may be sufficiently above 38kHz or sufficiently below 38 kHz. In this example, it is assumed that the initial value of the frequency is set to, for example, 40kHz sufficiently high.

After setting the initial value, the frequency at which the amount of received light is equal to the threshold value is searched for. In step S104, the transmitting device 18 receives a voltage having a set frequency and transmits infrared rays according to the voltage. This frequency is set to 40kHz, which is sufficiently higher than 38kHz, and therefore, the amount of received light is reduced to a sufficiently low value, and the amount of reflected light is reduced to 0.

In step S105, the detection device 19 waits for a lapse of a certain period of time, and detects the light receiving amount as an integrated value of the light receiving amount in the certain period of time. When the detection is completed, in step S106, the emission of the infrared rays by the emitting device 18 is stopped.

Here, the threshold value is considered to be the light receiving amount of 0. When the modulation frequency is decreased from 40kHz to 38kHz, the light receiving amount changes from 0 to a value greater than 0 at a specific frequency. The specific frequency at which the amount of received light changes from 0 was set as a calibration value at a temperature of 20 ℃. In order to detect such a change in the amount of received light, it is necessary to adjust the amount of emitted infrared light so that a sufficiently large amount of received light can be detected at least when the frequency is set to the maximum amount of received light.

In step S107, the adjustment unit 28 determines whether the light receiving amount as the detection result exceeds a threshold value to determine whether the set frequency is a frequency at which the light receiving amount changes from 0. If it is determined that the light receiving amount does not exceed the threshold value, the process proceeds to step S108, the adjustment unit 28 changes the frequency, and the process returns to step S104. On the other hand, if it is determined that the light receiving amount exceeds the threshold value, the calibration process is ended, and the process proceeds to step S109.

In step S109, the adjusting unit 28 stores the obtained calibration value in the memory 21, and ends the processing in step S110. The calibration value is an initial calibration value, which is a value including frequency and temperature.

Fig. 11 is a table illustrating an example of a table to manage calibration values after an initial calibration process. The table shows the correspondence between each temperature and the frequency set for each temperature. The frequency includes a decision frequency, a temporary frequency, and a reference frequency.

The decision frequency is a calibration value obtained as a result of performing calibration processing in a state where an object does not enter the housing 11 or in a state where it can be judged that an object does not enter the housing 11. In the decision frequency, the past temporal frequency obtained in a state where no insect pest enters or in a state where it can be judged that no insect pest enters is also included.

The provisional frequency is a calibration value obtained when the calibration process is performed in a state in which it cannot be determined that an object has not entered the housing 11. The reference frequency is obtained as follows: for the assumed value of the frequency set at each temperature measured and stored in advance, the individual error relating to the device is not considered, and therefore, the static individual error (offset value) defined as follows is considered: the difference between the temperature and frequency obtained at the initial calibration and the frequency measured at the same temperature at the initial calibration and stored in advance. The same offset value is taken into account when obtaining the reference frequency, and is added over the entire temperature range according to the assumed value of the frequency corresponding to each temperature. In addition, the reference frequency does not take into account the individual difference (dynamic individual error) of the temperature characteristic, and therefore, the reference frequency is regarded as a reference value.

The assumed value of the reference frequency may be a value previously stored in a table, but is not limited to this value. For example, the assumed value of the reference frequency may be calculated based on a calculation formula derived from values measured in advance at the respective temperatures, which represents the temperature characteristics. The offset value obtained at the time of initial calibration is also considered in the case of calculation based on the calculation formula. However, in this case, the reference frequency column need not be provided.

When the calibration process is performed without an object in the housing 11, the frequency of the relative measurement temperature can be decided, and therefore, the decided frequency is input into the decided frequency column. Therefore, when the frequency is determined to be 39.1kHz at the measurement temperature of 20 ℃ in the initial calibration process, 39.1kHz is input in the column of the determination frequency corresponding to the temperature of 20 ℃, as shown in fig. 11.

Cockroaches are known to be active at temperatures of about 20-32 c, and therefore, when an object is a cockroach which is an insect pest, the temperature range may be set to, for example, 0-45 c.

In addition, when the temperature characteristic of the assumed value is nonlinear and a nonlinear curve representing the characteristic changes depending on adjustment parameters other than the frequency, in this case, if simply considering the static individual error (offset value), the assumed value may be significantly offset in the temperature range. Examples of the adjustment parameters other than the frequency include the pulse width, the current amount, and the amplification factor of the rectangular wave described above. The assumed values are used only for the assumptions. On the other hand, when it takes time to determine the frequency, a detection result based on an assumed value is used as a basis for the detection. Therefore, it is desirable that the amount of deviation of the assumed value is as small as possible.

When the reception sensitivity is adjusted using the modulation frequency, a characteristic curve of the filter characteristic on the light receiving side, which represents the relationship between the frequency and the gain, corresponds to a curve representing the reception sensitivity in the assumed temperature range. However, if the emission intensities are different, the ranges of the characteristic curves to be used are also different, and therefore, a deviation occurs in the assumed values.

Fig. 12 is a diagram showing an example of a change in the shape of a characteristic curve on the light receiving side when the gain is changed in different ranges. Fig. 12 is a graph showing a curve shape by a dotted line and a dashed line, and shows a difference in shape.

In order to eliminate such a deviation, a preprocessing for adjusting the light emission amount, that is, the infrared light emission amount by another adjustment method so that the assumed frequency value of the temperature at that time, the light receiving amount is equal to or less than a predetermined threshold value is performed before the initial calibration processing. Another example of the adjusting method includes a method of adjusting the amount of current.

Here, the assumed value is an assumed value of a frequency as one of the adjustment parameters, and the current amount as the other adjustment parameter is adjusted so that the current amount obtained as a result of the adjustment is set to a fixed value, which will be described. However, the adjustment parameters are not limited to the above. Adjustment parameters other than frequency may be selected, such as pulse width, current magnitude, or amplification factor. Further, any parameter other than the parameter selected as the adjustment parameter may be selected as another adjustment parameter. Two or more parameters other than the parameter selected as the adjustment parameter may also be selected as the adjustment parameter.

FIG. 13 is a flowchart showing a flow of the pretreatment. When the power is turned on, the operation is started in step S200. In step S201, the detection apparatus 10 is kept in a standby state for a while until the characteristics of the sensor or the like serving as the temperature measuring device 23 are stabilized.

After a certain time has elapsed, the flow proceeds to step S202, and the operation control unit 25 instructs the temperature measuring device 23 to measure the temperature, and the temperature measuring device 23 receives the instruction to measure the current temperature.

After the temperature measurement, the pretreatment is started. The pre-processing is performed by a pre-processing unit. The preprocessing unit is realized, for example, by a control device 20 that operates according to a program read out from a memory 21, or by one or more dedicated circuits. In step S203, the preprocessing unit sets a reference frequency corresponding to the temperature. In step S204, the preprocessing unit instructs the transmitting device 18 to receive a voltage of a set frequency, and transmits infrared rays according to the voltage.

In step S205, the preprocessing unit waits for a lapse of a period of time, and instructs the detection device 19 to detect the light receiving amount as an accumulated value of light received during the period of time. When the detection is completed, the emission of infrared rays by the emission means 18 is stopped in step S206.

In step S207, the preprocessing unit determines whether the light receiving amount as the detection result exceeds a threshold value. If it is determined that the light receiving amount does not exceed the threshold value, the process proceeds to step S208, the preprocessing unit adjusts the amount of current to change the amount of light emission, and then the process returns to step S204. On the other hand, if it is determined that the amount of received light exceeds the threshold value, the current amount at that time is set to a fixed value, and the preprocessing is ended. Then, the process advances to step S209 to perform the calibration process. The calibration process has already been described with reference to fig. 10, and therefore, the description of the calibration process is omitted here. After the calibration process, the parameters are stored in step S210, and the process ends in step S211.

The preprocessing is performed in this way, and therefore, even when the adjustment accuracy of the light emission amount is low, as a result of the light emission amount adjustment, the characteristic curve becomes close to a curve representing a certain degree of reception sensitivity, thereby reducing the deviation, and therefore, the remaining deviation amount can be regarded as a linear deviation. In this case, if the initial calibration is performed after the preprocessing, the deviation amount can be significantly reduced.

Fig. 14 is a flowchart showing an example of the calibration processing and the detection processing performed at regular time intervals. This calibration process needs to be performed not only at the time of turning on the power of the detection apparatus 10 or at the time of initialization, but also after that. This is because of the temperature change in the housing 11 when the detection apparatus 10 is operating. Therefore, it is necessary to check the change of the state in the housing 11 at regular time intervals. The detection process may be performed at any time, and the detection process and the calibration process may also be performed at regular time intervals.

The timer unit 27 generates a trigger signal at regular time intervals. The process starts at step S300, and at step S301, the operation control unit 25 waits for the trigger signal to be generated, and instructs the temperature measuring device 23 to measure the temperature in response to the generation of the trigger signal. In step S302, the temperature measuring device 23 receives a command to measure the temperature in the housing 11.

In step S303, the temperature correction control unit 29 determines whether the temperature measured by the temperature measuring device 23 is the decided temperature. Whether or not the temperature is determined may be determined based on whether or not the value is set in a column of a determination frequency corresponding to the temperature, which is an effective frequency, in a table for managing calibration values.

When it is determined in step S303 that the temperature is the determined temperature, the temperature correction control unit 29 refers to the table in step S304, acquires the determination frequency corresponding to the temperature, and notifies the operation control unit 25 of the acquired determination frequency. The operation control unit 25 sets the notified decision frequency, and controls the frequency of the voltage to be input to the transmission device 18. In step S305, the transmitting device 18 receives a voltage of a set frequency, and transmits infrared rays based on the voltage.

In step S306, the detection device 19 waits for a lapse of a certain period of time, and detects the light receiving amount which is an accumulated value of the light amounts received in the certain period of time. When the detection is completed, in step S307, the emission of infrared rays by the emission device 18 is stopped. In step S308, the operation control unit 25 and the size detection unit 26 output, for example, a detection result as to whether or not the insect pest has entered, and if the insect pest has entered, a detection result of the approximate size of the insect pest, the detection result being stored in the memory 21, and the process ends in step S315.

If it is determined in step S303 that the temperature is not the decided temperature, the temperature correction control unit 29 determines in step S309 whether the temperature is the temporarily decided temperature. Whether or not the temperature is temporarily determined may be determined based on whether or not the value is set in the temporary frequency field corresponding to the temperature in the table for managing calibration values.

If it is determined in step S309 that the temperature is not the provisional decision temperature, the process proceeds to step S310, and the adjustment unit 28 executes the calibration process. The calibration process is the process of step S103 to step S108 in fig. 10. After the calibration processing is performed, the processing proceeds to step S311, the temperature correction control unit 29 stores the calibration value as a temporary parameter in the memory 21, and then the processing returns to step S309.

If it is determined in step S309 that the temperature is temporarily decided, the process proceeds to step S312, and the operation control unit 25 performs the frequency selection process. In the frequency selection process, a determination frequency or a reference frequency corresponding to a temperature close to the measured current temperature is selected.

When there is a decision frequency corresponding to a temperature within a certain temperature range with respect to the current temperature, the decision frequency is selected. When there are a plurality of decision frequencies corresponding to temperatures within a certain temperature range, a decision frequency corresponding to a temperature closest to the current temperature is selected from the plurality of decision frequencies. When there is no decision frequency corresponding to a temperature within a certain temperature range, a reference frequency corresponding to a temperature within a certain temperature range is selected, and when there are a plurality of reference frequencies, a reference frequency corresponding to a temperature closest to the current temperature is selected. The fixed temperature range may be determined by the accuracy of setting the frequency, the amount of change in the amount of received light, or the like.

Fig. 15 is a table illustrating an example of a table for managing calibration values to be referred to when selecting a frequency. For example, assume that the current temperature is 17 ℃. Referring to the table, a decision frequency or a reference frequency corresponding to the current temperature is not input in the table. In this case, a certain temperature range is set to 17. + -. 1 ℃ so that 16 ℃ and 18 ℃ are within this temperature range. At 18 ℃ 39.1kHz has been input as the determining frequency, and therefore 39.1kHz was chosen. On the other hand, the reference frequency of 39.2kHz is set at 16 ℃, but since the reference frequency is a reference value that does not take into account individual errors in temperature characteristics, the order of priority is assigned to the determination frequency.

Assuming that the current temperature is 15 ℃, neither the determination frequency nor the reference frequency is set. Thus, reference is made to frequencies of 14 ℃ or 16 ℃. No decision frequency was input at 14 ℃ or 16 ℃, but a reference frequency was input. Therefore, the reference frequency corresponding to the temperature closest to the current temperature is selected. In fig. 15, the temperatures are only depicted as 14 ℃ and 16 ℃, but also the decimal values are taken into account, and a certain reference frequency is selected. For example, assuming that the current temperature is 15.1 ℃, the above temperatures contained in the table are actually 14.2 ℃ and 15.7 ℃, which are within the range of 15.1 ± 1 ℃. Then, considering the decimal value, the reference frequency 39.2kHz corresponding to 15.7 ℃ closest to the current temperature is selected.

In the table shown in fig. 15, as a calibration value obtained in performing the calibration process when the measured temperature is 24 ℃, the frequency 38.9kHz is input to the temporary frequency field.

Referring to fig. 14, after selecting a frequency, in the frequency selection process, the selected frequency is set to the transmission device 18. After the frequency selection processing, detection processing is performed in step S313. The detection process is a process from step S305 to step S307. In step S314, based on the received-light amount, the operation control unit 25 and the size detection unit 26 output a temporary result of the detection, for example, as to whether or not pests have entered, store the temporary result of the detection in the memory 21, and end the processing in step S315.

After the initial calibration process, the calibration process is performed at regular time intervals, and if the measured temperature is different between each time point, a frequency determined only by the initial calibration process is set as a determination frequency, and besides, a temporary frequency. The detection process is not performed in the initial calibration process. Therefore, at a temperature corresponding to the determination frequency, i.e., the determined temperature, it is unclear whether the insect pest enters the housing 11.

In the calibration process performed at regular time intervals, if the measured temperature is the decided temperature, the detection process is performed for the first time in the calibration process. In this detection process, if no entry of pest is detected, even in the calibration process performed so far, it can be judged that there is no entry of pest. Therefore, the provisional frequency obtained in the calibration process performed so far can be regarded as the decision frequency.

On the other hand, in the detection process performed when the measured temperature is the decided temperature, where it is detected that the insect pest has entered, the detection result obtained so far is a provisional detection result, the point in time at which the insect pest entered cannot be specified, and therefore, all the provisional frequencies obtained so far cannot be used as the decision frequency. Therefore, all temporary frequencies obtained so far cannot be utilized as the decision frequency. Therefore, all temporary frequencies obtained so far are invalid frequencies, which can be deleted. In this case, insect pests may be removed, and after initialization is performed, it is performed again from the initial calibration process.

Fig. 16 is a flowchart illustrating an example of a process of shifting a temporary frequency to a decided frequency. The process starts at step S400. In step S401, the operation control unit 25 waits for the timer unit 27 to generate the trigger signal, instructs the temperature measuring device 23 to measure the temperature in response to the generation of the trigger signal, and in step S402, the temperature measuring device 23 receives the instruction to measure the temperature in the housing 11.

In step S403, the temperature correction control unit 29 determines whether the temperature measured by the temperature measuring device 23 is the decided temperature. Whether or not the temperature is determined may be determined based on whether or not the value is set in the determination frequency field corresponding to the temperature in the table for managing the calibration values.

When it is determined in step S403 that the temperature is the determined temperature, the temperature correction control unit 29 refers to the table in step S404, acquires the determination frequency corresponding to the temperature, and notifies the operation control unit 25 of the acquired determination frequency. The operation control unit 25 sets the determination frequency notified, and controls the frequency of the voltage input to the transmitter 18. Next, in step S405, the transmitting device 18 receives the voltage of the set frequency and transmits infrared rays based on the voltage. Then, the detection device 19 receives the reflected infrared ray. In this way, the detection process is performed. The detection processing is the processing from step S305 to step S307 in fig. 14.

In step S406, the operation control unit 25 and the size detection unit 26 output a detection result, for example, as to whether or not insect pests have entered, in accordance with the received light amount, the detection result being stored in the memory 21. In step S407, the temperature correction control unit 29 confirms whether or not the insect pest has entered with reference to the detection result, and thus the detection result indicates that the insect pest has not been detected. If no insect pest has been detected, the process proceeds to step S408. If insect pests are detected, the process proceeds to step S409.

In step S408, the temperature correction control unit 29 shifts the temporary frequency input to the table to the column of the decision frequency in the same table. Then, the process proceeds to step S411, and the process is ended.

In step S409, the temperature correction control unit 29 deletes all temporary frequencies input into the table. Then, the process proceeds to step S411, and the process is ended.

If it is determined in step S403 that the temperature is not the determined temperature, the process proceeds to step S410, and a provisional determination process is executed. The provisional decision processing is the processing from step S309 to step S314 in fig. 14. After the provisional decision processing is completed, the process proceeds to step S411, and the process is ended.

Fig. 17 illustrates an example of a table for managing the temporary frequency as a calibration value when deciding the frequency shift. As shown in fig. 11, the initialization was performed at 20 ℃, and in the calibration process performed after a certain time has elapsed, the measurement temperature was 24 ℃, as shown in fig. 15, and a temporary frequency of 38.9kHz was obtained. In the calibration process performed after a certain period of time, the measured temperature was 20 ℃, and the result of the detection was that no pest was detected.

Therefore, no insect pest was detected even in the calibration process performed at 24 ℃, and therefore, as shown in fig. 15, the temporary frequency of 38.9kHz at 24 ℃ was shifted to the decision frequency corresponding to the same temperature shown in fig. 17, i.e., 24 ℃.

When the provisional frequency is shifted to the determination frequency, the determination frequencies of 24 ℃ and 26 ℃ are inputted, and the determination frequency of 25 ℃ therebetween becomes a blank state without being inputted. When reference is made to the decision frequencies of 24 ℃ and 26 ℃, both are 38.9 kHz. In this way, when the determination frequency corresponding to a certain temperature is in the empty space and the determination frequency ranges of the upper and lower temperatures are the same frequency, the determination frequency of the temperature between the upper and lower temperatures may be determined to be the same frequency as the determination frequency of the upper and lower temperatures.

Therefore, the determination frequency at 25 ℃ was determined to be 38.9kHz, which is the same as the determination frequencies at 24 ℃ and 26 ℃, and as shown in FIG. 17, 38.9kHz was entered in the determination frequency column at 25 ℃.

In this way, a parameter such as a frequency corresponding to each temperature is decided and input at any time, and a table is filled with the decision frequency, whereby the decision frequency corresponding to the measured temperature can be set, and the detection process can be performed. Therefore, even if the temperature changes, the detection result can be output, and the detection error is reduced.

Fig. 18 is a perspective view of another example of the inside of the inspection apparatus 10. The detection apparatus 10 includes an object detection part 12 and a device part 13, and in addition, the detection apparatus 10 further includes a trap 40 for catching vermin and a switch 41 for attaching and detaching the trap 40. The object detection unit 12 and the device unit 13 are explained, and therefore, the following explanation is focused on the catcher 40 and the switch 41.

The catcher 40 includes an adhesive portion 40a, a peripheral portion 40b, and a protruding portion 40 c. The adhesive portion 40a catches the pest, the peripheral edge portion 40b surrounds the adhesive portion 40a and is adjacent to the lower surface of the bottom wall 12a, and the projection portion 40c is provided on the peripheral edge portion 40b and projects in the Z-axis direction. The bottom wall 12a has an opening 50 at its center, and for example, the opening 50 has a rectangular shape and a prescribed size. The peripheral edge 40b of the catcher 40 is adjacent to the lower surface of the bottom wall 12a, and the adhesive portion 40a is exposed in the opening 50. For example, the adhesive portion 40a is formed by attaching an adhesive sheet or the like to the center portion of the plate-like catcher 40.

The switch 41 is provided on the bottom wall 12a, and includes an insertion portion into which the projection 40c is inserted, and is turned on when the projection 40c is inserted into the insertion portion. When the projection 40c is pulled out from the insertion portion, the switch is turned off. This is an example and is not limited to this structure.

The switch 41 also has the function of a power switch. In this case, when the catcher 40 is detached, the power is turned off, and when the catcher 40 is attached, the power is turned on. For example, the protruding portion 40c has a conductive portion. The switch 41 has two contacts, and when the projection 40c is inserted into the insertion portion and the catcher 40 is mounted, the two contacts are connected to the conductive portion to achieve electrical connection, and thus, the power source can be turned on. On the other hand, when the projection 40c is pulled out from the insertion portion to remove the catcher 40, the electrical connection is broken, and therefore, the power supply is disconnected. By causing the switch 41 to function as a power switch in this manner, when the catcher 40 is attached, the power is turned on and the initialization is started.

When the trap 40 is replaced, a difference occurs between the state of the detection space before replacement and the state of the detection space after replacement due to a trap shape deviation or the like, which also causes a change in the amount of received infrared rays. Therefore, at the time of replacement of the catcher 40, the power supply is temporarily turned off and then turned on, and as a result, the initial calibration process can be restarted as the initialization process.

At this time, the result of the initial calibration processing is output, and the result is notified to an external data server or the like together with a flag indicating the result of the initial calibration processing. Upon receiving the notification, the data server or the like may record the date and time of replacement of the capturer 40.

The present invention has been described so far with respect to the detection apparatus, the detection system, and the detection method according to the above-described embodiments, however, the present invention is not limited to the above-described embodiments, and other embodiments, additions, modifications, deletions, and the like may be performed within a range that can be conceived by those skilled in the art. In addition, any form is included in the scope of the present invention as long as the action and effect of the present invention are achieved.

Therefore, for example, a program for realizing each function of the above-described control device, a recording medium on which the program is recorded, and a server device that stores the above-described program and provides the program in response to a download request may also be provided, and further, the detection system may include the above-described data server or the like.

The above embodiments are illustrative and do not limit the disclosure of the present invention. Accordingly, many additional modifications and variations are possible in light of the above teaching. For example, elements and/or features of different illustrative embodiments may be combined with each other and/or substituted for each other within the scope of the invention. Any of the above-described operations may be performed in various other ways, in different orders than the above-described operations.

The functions of the described embodiments may be implemented by one or more processing circuits or circuits. The processing circuitry comprises a programmed processor, which includes as a processor circuitry such devices as Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Field Programmable Gate Arrays (FPGAs) and conventional circuit elements arranged to perform the described functions.

The present patent application is based on and claims from 35U.S.C. § 119(a) priority from Japanese patent application No. 2019-.

List of reference numerals

10 detection device

11 casing

12 object detecting part

12a bottom wall

12b upper wall

12 c-12 e side wall

12f bump

12g detection space

13 device part

13a supporting leg

13b projection

14 bulkhead

15 opening part

16 control substrate

17 power supply

18 emitting device

19 detection device

20 control device

21 memory

22 input/output device

23 temperature measuring device

25 operating the control unit

26 size detection unit

27 timer unit

28 adjustment unit

29 temperature correction control unit

30 resistance

31 infrared LED

32 switching element

33PIN photodiode

34I-V converter

35 amplifier

36 band-limiting filter

37 demodulator

40 Capture device

40a adhesive part

40b peripheral edge portion

40c projection

41 switch

50 opening

Claims (17)

1. A detection apparatus for detecting an object, the detection apparatus comprising:

a case having an inner face having a reflectance equal to or lower than a certain value;

an emitter configured to emit infrared rays into the housing;

a sensor configured to detect infrared rays; and

one or more processors configured to adjust the intensity of the reflected infrared rays according to the detection result of the sensor.

2. The detection apparatus of claim 1,

the transmitter transmits infrared rays modulated in response to a rectangular wave input, an

The one or more processors are further configured to adjust a frequency of the rectangular wave such that an intensity of the reflected infrared ray is maintained at a predetermined threshold in a state where the object is not present in the housing.

3. The detection apparatus of claim 1,

the transmitter transmits infrared rays modulated in response to a rectangular wave input, an

The one or more processors are further configured to adjust a pulse width of the rectangular wave such that an intensity of the reflected infrared ray is maintained at a predetermined threshold in a state where the object is not present in the housing.

4. The detection apparatus of claim 1,

the transmitter transmits infrared rays according to the amount of input current, an

The one or more processors are further configured to adjust the amount of input current such that the intensity of the reflected infrared light remains at a predetermined threshold in a state where the object is not present in the housing.

5. The detection apparatus of claim 1,

the transmitter emits infrared light modulated in response to a square wave input,

the sensor includes an amplifier configured to amplify a detected amount of infrared rays, and

the one or more processors are further configured to adjust an amplification factor of the amplifier such that an intensity of the reflected infrared light is maintained at a predetermined threshold in a state where the object is not present in the housing.

6. The detection apparatus according to any one of claims 2 to 5,

the detection device detects the object according to whether the intensity of the reflected infrared ray exceeds the predetermined threshold.

7. The detection apparatus according to any one of claims 1 to 6, further comprising:

a temperature sensor configured to measure a temperature in the housing,

wherein the one or more processors are further configured to determine whether a value adjusted by the one or more processors is valid at the temperature measured by the temperature sensor.

8. The detection apparatus of claim 7,

the one or more processors are further configured to, when the value is adjusted in a state where the object is not present within the housing, determine that the value adjusted by the one or more processors is valid, cause the memory to store the value as a decision value associated with the temperature measured by the temperature sensor.

9. The detection apparatus of claim 8,

in the event that the memory does not store a determinative value for the temperature measured by a temperature sensor, the one or more processors are further configured to cause the memory to store the value adjusted by the one or more processors as a temporary value related to the temperature.

10. The detection apparatus according to any one of claims 7 to 9,

the one or more processors are further configured to set a value measured in advance at each temperature as the assumed value corresponding to each temperature, cause the memory to store the assumed value in association with each temperature, and set a value obtained based on the assumed value in reconsideration of individual errors as a reference value.

11. The detection apparatus according to any one of claims 7 to 9,

the one or more processors are further configured to calculate an assumed value from a calculation formula derived based on values measured in advance at respective temperatures, and set a value obtained based on the assumed value in reconsideration of individual errors as a reference value.

12. The detection apparatus according to claim 10 or 11,

the adjustment parameter corresponding to each temperature as the assumed value is selected from a frequency of the rectangular wave input for emitting infrared rays, a pulse width of the rectangular wave, and an amplification factor of an amplifier configured to amplify a detected amount of infrared rays,

the one or more processors are further configured to determine a fixed value if an adjustment parameter other than the selected adjustment parameter is set to a fixed value.

13. The detection apparatus according to any one of claims 10 to 12,

the one or more processors are further configured to: when a memory does not store a decision value determined to be valid for the temperature measured by the temperature sensor, the transmitter or the sensor is controlled by using a decision value or a reference value stored in association with the temperature closest to the temperature measured by the temperature sensor.

14. The detection apparatus of claim 9,

in the case where the memory stores decision values for the temperatures measured by the temperature sensors, and the object is not detected in the process of detecting the object, the one or more processors are further configured to change each temporary value associated with the each temperature currently stored to each decision value, causing the memory to store the each decision value associated with the each temperature.

15. The detection apparatus according to any one of claims 1 to 14,

the object is an insect pest and the object is,

the detection apparatus further comprises:

a trap configured to trap insect pests, the trap being replaceably mounted to the housing; and

a switch configured to turn off a power supply when the trap is detached from the housing and to turn on the power supply when the trap is attached to the housing,

the one or more processors are further configured to execute an initialization process for adjustment each time the catcher is replaced, so that the reflection intensity of the infrared rays is maintained at a predetermined value in a state where the object is not present in the case.

16. A detection system for detecting an object, the detection system comprising:

a case having an inner face having a reflectance equal to or lower than a certain value;

a transmitter configured to transmit infrared rays into the housing;

a sensor configured to detect the infrared ray; and

one or more processors configured to adjust the reflection intensity of the infrared rays according to the detection result of the sensor.

17. A detection method performed by a detection apparatus for detecting an object, the detection method comprising:

emitting infrared rays from an emitter into a housing having an inner face with a reflectance equal to or lower than a certain value;

detecting infrared rays by a sensor; and

detecting an object based on a detection result of the sensor,

wherein the detection method further comprises:

and adjusting the reflection intensity of the infrared ray according to the detection result of the sensor.

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