CN110398741A - Ultrasonic sensor, range-measurement system and distance measuring method - Google Patents
Ultrasonic sensor, range-measurement system and distance measuring method Download PDFInfo
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- CN110398741A CN110398741A CN201910709054.8A CN201910709054A CN110398741A CN 110398741 A CN110398741 A CN 110398741A CN 201910709054 A CN201910709054 A CN 201910709054A CN 110398741 A CN110398741 A CN 110398741A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
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- Radar, Positioning & Navigation (AREA)
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- Acoustics & Sound (AREA)
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
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Abstract
The present invention provides a kind of ultrasonic sensor, range-measurement system and distance measuring methods, wherein the ultrasonic sensor includes: the processing unit being set on circuit board and the visiting core connecting with processing unit and USB interface；Wherein, visiting core is used to emit ultrasonic wave and receives the echo-signal of return；USB interface is used to connect with control equipment, carries out signal transmission；Processing unit, the control instruction sent for receiving and parsing through control equipment by USB interface, the visiting core transmitting ultrasonic wave is controlled according to control instruction and receives the echo-signal of return, ultrasonic sensor is calculated according to echo-signal, and the distance is fed back into control equipment at a distance from target object, and through the USB interface.The present invention is communicated by USB interface convenient for the control such as ultrasonic sensor and mobile phone, computer equipment, and the distance that ultrasonic sensor monitors is sent to control equipment, versatile, does not need to buy interface convertor, save the cost.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an ultrasonic sensor, a distance measuring system and a distance measuring method.
Background
An ultrasonic sensor is a sensor that converts an ultrasonic signal into another energy signal (typically an electrical signal). The ultrasonic waves can generate obvious reflection to form reflection echoes when encountering impurities or target objects, so that the ultrasonic waves can be used for measuring distances and are widely applied to the aspects of industry, national defense, biomedicine and the like.
However, the distance monitored by the existing ultrasonic sensor can only be transmitted to the control devices such as mobile phones and computers through a specific interface (such as a LIN interface) or an interface converter, so that the universality is poor, and great inconvenience is brought to the application and installation of users.
Disclosure of Invention
The invention aims to provide an ultrasonic sensor, a distance measuring system and a distance measuring method, and aims to solve the problems that the existing ultrasonic sensor needs to send a monitoring result to control equipment such as a mobile phone, a computer and the like through a specific interface or an interface converter, the universality is poor, and the installation is inconvenient.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an ultrasonic sensor which comprises a processing unit arranged on a circuit board, and a probe core and a USB interface which are connected with the processing unit; wherein,
the probe core is used for transmitting ultrasonic waves and receiving returned echo signals;
the USB interface is used for being connected with control equipment to carry out signal transmission;
the processing unit is used for receiving and analyzing a control instruction sent by the control equipment through the USB interface, controlling the probe core to transmit ultrasonic waves and receive returned echo signals according to the control instruction, calculating the distance between the ultrasonic sensor and a target object according to the echo signals, and feeding the distance back to the control equipment through the USB interface.
In one embodiment, the ultrasonic sensor further comprises:
and the ultrasonic driving circuit is connected with the probe core and is used for improving the transmitting frequency of the probe core.
In one embodiment, the ultrasonic sensor further comprises:
and the amplifying circuit is connected with the probe core and is used for amplifying the echo signal received by the probe core.
In an embodiment, the processing unit is electrically connected to an analog-to-digital conversion circuit and a filter circuit, the filter circuit is configured to perform filtering processing on the echo signal, and the analog-to-digital conversion circuit is configured to convert the echo signal after the filtering processing into a digital signal.
In an embodiment, ultrasonic sensor still includes the casing and inhales the sound cotton, circuit board, visit the core and inhale the cotton encapsulation of sound in the cavity of casing, inhale the sound cotton set up in circuit board and visit between the core.
The invention also provides a distance measuring system which comprises control equipment and at least two ultrasonic sensors, wherein each ultrasonic sensor is connected with the control equipment through a USB interface.
The invention also provides a distance measuring method, which is realized on the basis of any one of the ultrasonic sensors, and the method comprises the following steps:
receiving and analyzing a control instruction sent by the control equipment through the USB interface;
controlling the probe core to transmit ultrasonic waves and receive returned echo signals according to the control instruction;
and calculating the distance between the ultrasonic sensor and the target object according to the echo signal, and feeding back the distance to the control equipment through the USB interface.
In an embodiment, before calculating the distance between the ultrasonic sensor and the target object according to the echo signal, the method further includes:
when the echo signal does not meet the preset requirement, controlling an ultrasonic drive circuit to improve the emission frequency of the probe core;
and controlling the probe core to emit the ultrasonic wave again and receive the returned echo signal until the echo signal meets the preset requirement, and executing the step of calculating the distance between the ultrasonic sensor and the target object according to the echo signal.
In an embodiment, after the controlling the probe core to transmit the ultrasonic wave and receive the returned echo signal according to the control instruction, the method further includes:
filtering a aftershock signal in the echo signal;
screening out signals with amplitude values meeting the threshold requirement from the filtered echo signals to obtain target objects;
and storing the related information of the target objects according to the maximum number of the target objects preset by a user.
In an embodiment, before the receiving and analyzing the control instruction sent by the control device through the USB interface, the method further includes:
and receiving a parameter modification or parameter configuration instruction issued by the control equipment through the USB interface, and modifying or configuring the parameters of the ultrasonic sensor.
In one embodiment, the step of calculating the distance between the ultrasonic sensor and the target object according to the echo signal includes:
detecting the working temperature of the ultrasonic sensor to generate a temperature signal;
and calculating the distance between the ultrasonic sensor and the target object according to the echo signal and the temperature signal.
Compared with the prior art, the scheme of the invention has the following advantages:
the invention provides an ultrasonic sensor, a distance measuring system and a distance measuring method, comprising a processing unit arranged on a circuit board, and a probe core and a USB interface which are connected with the processing unit; the probe core is used for transmitting ultrasonic waves and receiving returned echo signals; the USB interface is used for being connected with control equipment to carry out signal transmission; the processing unit is used for receiving and analyzing a control instruction sent by the control equipment through the USB interface, controlling the probe core to transmit ultrasonic waves and receive returned echo signals according to the control instruction, calculating the distance between the ultrasonic sensor and a target object according to the echo signals, and feeding the distance back to the control equipment through the USB interface. According to the invention, the ultrasonic sensor can conveniently communicate with control equipment such as a mobile phone and a computer through the USB interface, and the distance monitored by the ultrasonic sensor is sent to the control equipment, so that the universal convenience is improved, an interface converter does not need to be purchased specially, and the cost is saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of an ultrasonic sensor shown in accordance with an exemplary embodiment, with control equipment shown for ease of illustration;
FIG. 2 is a schematic diagram illustrating a distance measurement of an ultrasonic sensor in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating a partial structure of an ultrasonic sensor in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating one manner of connecting a USB interface to a control device in accordance with an exemplary embodiment;
fig. 5 is a flow chart illustrating a ranging method according to an example embodiment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Referring to fig. 1 in combination with fig. 2, the present invention provides an ultrasonic sensor, which is used to solve the problems of poor versatility and inconvenient installation of the conventional ultrasonic sensor that a specific interface or an interface converter is required to transmit a monitoring result to a control device such as a mobile phone or a computer. In one embodiment, the ultrasonic sensor includes a processing unit 120 disposed on a circuit board, and a probe 110 and a USB interface 130 connected to the processing unit 120; wherein,
the probe core 110 is used for emitting ultrasonic waves, the ultrasonic waves return when encountering a target object, and the probe core 110 is also used for receiving echo signals returned by the ultrasonic waves. The USB interface 130 is used for connecting with a control device to perform signal transmission; the processing unit 120 is configured to receive and analyze a control instruction sent by the control device through the USB interface 130, control the core probe 110 to transmit ultrasonic waves and receive a returned echo signal according to the control instruction, calculate a distance between the ultrasonic sensor and a target object according to the echo signal, and feed the distance back to the control device through the USB interface 130.
According to the invention, the USB interface 130 is convenient for the ultrasonic sensor to communicate with control equipment such as a mobile phone and a computer, and the distance monitored by the ultrasonic sensor is sent to the control equipment, so that the adaptability of the ultrasonic sensor to various occasions is improved, the universal convenience is strong, an interface converter does not need to be purchased specially, the installation and debugging are convenient, the cost is saved, and the multi-sensor communication network is also favorable for being established.
In an embodiment, in order to improve the user interaction experience, the detection of the target object may also be started by the user, and after the user inputs a detection instruction, the ultrasonic sensor is started to detect the target object, where the detection instruction may be input through a switch input, an interface input, a voice or a gesture, or other instruction. Of course, the detection mode of the target object is not limited to user activation, and the target object may be detected in a set period by the machine.
Further, the distance between the ultrasonic sensor and the target object is calculated by the following formula:
L＝V*T/2；
wherein, the L is the distance between the ultrasonic sensor and the target object, the V is the propagation speed of the ultrasonic wave (the propagation speed of sound in the air is 340m/s at 15 ℃), and the T is the time of transmitting and receiving the echo signal by the ultrasonic wave.
Further, the probe core 110 includes a transmitter and a receiver, the transmitter is used for transmitting ultrasonic waves; the receiver is configured to receive an echo signal returned when the ultrasonic wave encounters the target object, and send the echo signal to the processing unit 120 for processing.
Further, the USB interface 130 includes an input interface for connecting with a control device and an output interface for connecting with the processing unit 120 of the ultrasonic sensor; the input interface and the output interface are provided with a power interface, a ground wire interface and a data transmission interface.
In one embodiment, the control device may issue an instruction to modify or configure the functional parameters of the ultrasonic sensor according to the operating environment of the ultrasonic sensor through the USB interface 130 according to the corresponding protocol. For example, when the temperature of the current working environment is higher, the functional parameters of the ultrasonic sensor are adjusted to be parameters suitable for the environment with higher temperature, so that the measurement performance of the ultrasonic sensor can be adjusted in real time according to the working environment, the real-time performance and the stability are improved, the adaptability of the ultrasonic sensor to various occasions is also improved, the installation and the debugging are convenient, and the cost of the debugging and the installation is reduced.
In one embodiment, the ultrasonic sensor further comprises a storage unit, which can be used for storing the parameters of the ultrasonic sensor after being modified or configured by the user. For example, the processing unit 120 may store various parameters modified or configured by the user in a flash memory built in the ultrasonic sensor, so as to be directly called when the ultrasonic sensor is used next time, and also avoid the need for the user to resend an instruction to modify or configure the parameters after the ultrasonic sensor is powered off every time, thereby simplifying the operation flow.
Further, the ultrasonic sensor further comprises a temperature and humidity sensor, the temperature and humidity sensor is connected with the processing unit 120 and used for detecting the temperature and the humidity of the working environment of the ultrasonic sensor and sending temperature and humidity signals to the processing unit 120, and the processing unit 120 combines the temperature and humidity signals to correct the distance between the temperature and the target object so as to correct the temperature drift caused by the temperature accumulation inside the ultrasonic sensor and reduce the influence of the humidity on distance detection, thereby improving the accuracy of distance detection.
At present, an ultrasonic sensor is limited by the frequency of ultrasonic waves (such as 58kHz-80kHz), the distance measurement resolution can only be 0.5cm at minimum, and the application scene with higher resolution cannot be met. Therefore, in an embodiment, the ultrasonic sensor further includes an ultrasonic driving circuit connected to the probe core 110, and configured to increase the transmitting frequency of the probe core 110, so that for a scene with a high measurement resolution requirement, the transmitting frequency of the probe core 110 can be increased to several hundred kHz by the ultrasonic driving circuit, so that the minimum measurement resolution can reach 0.3mm, and the measurement accuracy is further improved.
In an embodiment, the ultrasonic sensor further includes an amplifying circuit connected to the probe core 110, for amplifying the echo signal received by the probe core 110, so as to facilitate the processing of the echo signal by the processing unit 120.
In an embodiment, the processing unit 120 is electrically connected to an analog-to-digital conversion circuit and a filter circuit, the filter circuit is configured to perform filtering processing on the echo signal, and the analog-to-digital conversion circuit is configured to convert the echo signal after the filtering processing into a digital signal, so as to filter an interference signal, and enable the whole calculation and data transmission to adopt a digital signal form, so that the processing unit 120 is convenient to calculate a distance between the ultrasonic sensor and a target object, reduce distortion, and improve detection accuracy and transmission speed.
In one embodiment, the ultrasonic sensor further comprises a modulator electrically connected to the processing unit 120, and the modulator is configured to package the distance in a USB standard protocol format, so as to feed back the packaged distance to the control device in the form of a data packet through the USB interface 130. And after receiving the data packet, the control equipment unpacks the data packet in the USB standard protocol format and extracts the information of the data packet.
In one embodiment, as shown in fig. 3, the processing unit 120, the ultrasonic driving circuit, the amplifying circuit, the analog-to-digital conversion circuit and the filtering circuit can be integrated on the same circuit board 4, so that the whole ultrasonic sensor has a compact structure and a reduced size. The ultrasonic sensor further comprises a shell 1 and sound-absorbing cotton (not shown), the circuit board 4, the probe core 110 and the sound-absorbing cotton are packaged in the cavity 2 of the shell 1, and the sound-absorbing cotton is arranged between the circuit board 4 and the probe core 110. The sound absorption cotton is used for absorbing redundant ultrasonic waves emitted by the ultrasonic sensor so as to prevent the redundant ultrasonic waves from interfering with a detection signal of a target object detected by the ultrasonic sensor. And the redundant space part in the cavity 2 of the shell 1 can be filled and encapsulated by adopting sealant.
Furthermore, the shell 1 is provided with an elastic sheet for mounting the ultrasonic sensor. A core-probing capsule 3 is further arranged between the probing core 110 and the circuit board 4, the probing core 110 is fastened in the housing 1 by annular fastening force of the capsule 3 on the probing core 110, and external moisture is prevented from entering the circuit board in the cavity 2 through a gap between the probing core 110 and the housing 1.
The invention also provides a distance measuring system which comprises control equipment and at least two ultrasonic sensors, wherein each ultrasonic sensor is connected with the control equipment through a USB interface. Referring to fig. 4, an output interface of one USB interface may be connected to a plurality of ultrasonic sensors through a USB harness, an input interface may be connected to a plurality of other USB interfaces through USB expansion interfaces, and the other USB interfaces may be connected to a control device, respectively, so as to implement a multi-sensor communication network.
As shown in fig. 5, the present invention further provides a distance measuring method implemented on the basis of the ultrasonic sensor, and the method includes the following steps:
s11, receiving and analyzing a control instruction sent by the control equipment through the USB interface;
s12, controlling the probe core to transmit ultrasonic waves and receive returned echo signals according to the control instruction;
and S13, calculating the distance between the ultrasonic sensor and the target object according to the echo signal, and feeding back the distance to the control equipment through the USB interface.
In this embodiment, a control instruction sent by the control device may be received through a USB interface, the control instruction is decompressed, whether address information included in the control instruction matches the address of the ultrasonic sensor is determined, and when the address matching is successful, the specific instruction content is analyzed and executed. The address information may include an IP address, etc.
According to the invention, the communication between the ultrasonic sensor and the control equipment such as a mobile phone and a computer is facilitated through the USB interface, and the distance monitored by the ultrasonic sensor is sent to the control equipment, so that the adaptability of the ultrasonic sensor to various occasions is improved, the universal convenience is stronger, an interface converter is not required to be purchased specially, the installation and debugging are convenient, the cost is saved, and the construction of a multi-sensor communication network is facilitated.
The step of feeding back the distance to the control device through the USB interface may specifically include:
and packaging the distance in a USB standard protocol format, and feeding back to the control equipment through a USB interface.
In an embodiment, in order to improve the user interaction experience, the detection of the target object may also be started by the user, and after the user inputs a detection instruction, the ultrasonic sensor is started to detect the target object, where the detection instruction may be input through a switch input, an interface input, a voice or a gesture, or other instruction. Of course, the detection mode of the target object is not limited to user activation, and the target object may be detected in a set period by the machine.
In an embodiment, before calculating the distance between the ultrasonic sensor and the target object according to the echo signal, the method may further include:
when the echo signal does not meet the preset requirement, controlling an ultrasonic drive circuit to improve the emission frequency of the probe core;
and controlling the probe core to emit the ultrasonic wave again and receive the returned echo signal until the echo signal meets the preset requirement, and executing the step of calculating the distance between the ultrasonic sensor and the target object according to the echo signal.
At present, an ultrasonic sensor is limited by the frequency of ultrasonic waves (such as 58kHz-80kHz), the distance measurement resolution can only be 0.5cm at minimum, and the application scene with higher resolution cannot be met. Therefore, in this embodiment, after the processing unit receives the echo signal, the processing unit analyzes the echo signal, and determines whether the echo signal meets a preset requirement, for example, whether the number of target objects in the echo signal meets the preset requirement, the number of interference signals in the echo signal is small, or effective information in the echo signal is complete, and if so, calculates the distance between the ultrasonic sensor and the target object according to the echo signal.
And when the echo signal does not meet the preset requirement, controlling an ultrasonic drive circuit to increase the transmitting frequency of the probe core so as to transmit the ultrasonic wave again by the increased transmitting frequency and receive the returned echo signal, then judging whether the echo signal meets the preset requirement again, and calculating the distance between the ultrasonic sensor and the target object according to the echo signal when the echo signal meets the preset requirement.
The ultrasonic drive circuit is used for improving the transmitting frequency of the probe core, so that the transmitting frequency of the probe core can be increased to hundreds of kHz through the ultrasonic drive circuit aiming at a scene with high measurement resolution requirement, the minimum measured resolution can reach 0.3mm, and the measurement accuracy is further improved.
In an embodiment, the ultrasonic driving circuit may further send a driving signal to the ultrasonic sensor to drive the ultrasonic sensor to emit an ultrasonic signal satisfying a predetermined range by adjusting the emission power. For example, when the target object is far away and the target object is not detected many times, the transmitting power of the probe core is increased through the ultrasonic driving circuit, so that the transmitted ultrasonic waves can fly for a long distance.
In an embodiment, after the controlling the probe core to transmit the ultrasonic wave and receive the returned echo signal according to the control instruction, the method may further include:
filtering a aftershock signal in the echo signal;
screening out signals with amplitude values meeting the threshold requirement from the filtered echo signals to obtain target objects;
and storing the related information of the target objects according to the maximum number of the target objects preset by a user.
In this embodiment, the amplitude of the echo signal is characteristic of the target object. In general, the larger the amplitude of the echo signal, the closer the target object is to the ultrasonic sensor. Certainly, the echo signal may also include a noise interference amplitude, and therefore, the noise amplitude needs to be filtered below the threshold by setting a suitable threshold, so that the amplitude greater than the threshold in the echo signal can be determined as the amplitude of the target object. And then, storing the related information of the target objects according to the maximum number of the target objects preset by the user so as to detect all the target objects to the maximum extent, reduce detection errors and improve detection accuracy.
In an embodiment, before receiving and parsing the control instruction sent by the control device through the USB interface, the method may further include:
and receiving a parameter modification or parameter configuration instruction issued by the control equipment through the USB interface, and modifying or configuring the parameters of the ultrasonic sensor.
In this embodiment, the control device may issue an instruction to modify or configure the functional parameters of the ultrasonic sensor through the USB interface according to a protocol via the USB interface according to the operating environment of the ultrasonic sensor. For example, when the temperature of the current working environment is higher, the functional parameters of the ultrasonic sensor are adjusted to be parameters suitable for the environment with higher temperature, so that the measurement performance of the ultrasonic sensor can be adjusted in real time according to the working environment, the real-time performance and the stability are improved, the adaptability of the ultrasonic sensor to various occasions is also improved, the installation and the debugging are convenient, and the cost of the debugging and the installation is reduced.
In an embodiment, after modifying or configuring the parameter of the ultrasonic sensor, the method may further include:
various parameters modified or configured by the user are stored in a flash memory built in the ultrasonic sensor.
In this embodiment, the ultrasonic sensor further comprises a storage unit operable to store parameters for a user to modify or configure the ultrasonic sensor. For example, the processing unit can store various parameters modified or configured by a user in a flash memory built in the ultrasonic sensor so as to be directly called when the ultrasonic sensor is used next time, thereby avoiding the need that the user resends instructions to modify or configure the parameters after the ultrasonic sensor is powered off every time and simplifying the operation flow.
In one embodiment, the step of calculating the distance between the ultrasonic sensor and the target object according to the echo signal includes:
detecting the working temperature of the ultrasonic sensor to generate a temperature signal;
and calculating the distance between the ultrasonic sensor and the target object according to the echo signal and the temperature signal.
In this embodiment, the processing unit is further configured to correct the distance signal in combination with the temperature and humidity signal, so as to correct a temperature drift caused by temperature accumulation inside the ultrasonic sensor, thereby improving accuracy of distance detection.
In an exemplary embodiment, there is also provided a storage medium comprising instructions, such as a memory comprising instructions, executable by a processor of a control device to perform the ranging method described above. For example, the storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (11)
1. An ultrasonic sensor is characterized by comprising a processing unit arranged on a circuit board, and a probe core and a USB interface which are connected with the processing unit; wherein,
the probe core is used for transmitting ultrasonic waves and receiving returned echo signals;
the USB interface is used for being connected with control equipment to carry out signal transmission;
the processing unit is used for receiving and analyzing a control instruction sent by the control equipment through the USB interface, controlling the probe core to transmit ultrasonic waves and receive returned echo signals according to the control instruction, calculating the distance between the ultrasonic sensor and a target object according to the echo signals, and feeding the distance back to the control equipment through the USB interface.
2. The ultrasonic sensor of claim 1, further comprising:
and the ultrasonic driving circuit is connected with the probe core and is used for improving the transmitting frequency of the probe core.
3. The ultrasonic sensor of claim 1, further comprising:
and the amplifying circuit is connected with the probe core and is used for amplifying the echo signal received by the probe core.
4. The ultrasonic sensor according to claim 1, wherein the processing unit is electrically connected to an analog-to-digital conversion circuit and a filter circuit, the filter circuit is configured to perform a filtering process on the echo signal, and the analog-to-digital conversion circuit is configured to convert the echo signal after the filtering process into a digital signal.
5. The ultrasonic sensor of claim 1, further comprising a housing and sound absorbing cotton, wherein the circuit board, the probe core and the sound absorbing cotton are enclosed in a cavity of the housing, and the sound absorbing cotton is disposed between the circuit board and the probe core.
6. A ranging system comprising a control device and at least two ultrasonic sensors according to any one of claims 1 to 5, wherein each of the ultrasonic sensors is connected to the control device via a USB interface.
7. A distance measuring method implemented on the ultrasonic sensor according to any one of claims 1 to 5, comprising the steps of:
receiving and analyzing a control instruction sent by the control equipment through the USB interface;
controlling the probe core to transmit ultrasonic waves and receive returned echo signals according to the control instruction;
and calculating the distance between the ultrasonic sensor and the target object according to the echo signal, and feeding back the distance to the control equipment through the USB interface.
8. The range finding method of claim 7, wherein before calculating the distance between the ultrasonic sensor and the target object according to the echo signal, the method further comprises:
when the echo signal does not meet the preset requirement, controlling an ultrasonic drive circuit to improve the emission frequency of the probe core;
and controlling the probe core to emit the ultrasonic wave again and receive the returned echo signal until the echo signal meets the preset requirement, and executing the step of calculating the distance between the ultrasonic sensor and the target object according to the echo signal.
9. The distance measuring method according to claim 7, wherein after controlling the probe core to emit the ultrasonic wave and receive the returned echo signal according to the control command, the method further comprises:
filtering a aftershock signal in the echo signal;
screening out signals with amplitude values meeting the threshold requirement from the filtered echo signals to obtain target objects;
and storing the related information of the target objects according to the maximum number of the target objects preset by a user.
10. The ranging method according to claim 7, wherein before the receiving and analyzing the control command sent by the control device through the USB interface, the method further comprises:
and receiving a parameter modification or parameter configuration instruction issued by the control equipment through the USB interface, and modifying or configuring the parameters of the ultrasonic sensor.
11. The distance measuring method according to claim 7, wherein said step of calculating the distance between the ultrasonic sensor and the target object based on the echo signal comprises:
detecting the working temperature of the ultrasonic sensor to generate a temperature signal;
and calculating the distance between the ultrasonic sensor and the target object according to the echo signal and the temperature signal.
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| CN110850417A (en) * | 2019-11-18 | 2020-02-28 | 广东奥迪威传感科技股份有限公司 | Ultrasonic ranging module and ultrasonic ranging equipment |
| CN110940986A (en) * | 2019-12-25 | 2020-03-31 | 广东奥迪威传感科技股份有限公司 | Ultrasonic detection device and ultrasonic detection system |
| CN112630781A (en) * | 2020-11-27 | 2021-04-09 | 深圳数联天下智能科技有限公司 | Ultrasonic distance measuring device and ultrasonic distance measuring method |
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