CN215374218U - Illuminance measuring device - Google Patents

Abstract

The application provides an illuminance measurement device, includes: the sensor is used for detecting the illuminance and outputting a first signal according to a detection result; the first circuit is electrically connected with the sensor, receives a first signal output by the sensor, performs analog-to-digital conversion and outputs a second signal; the second circuit is electrically connected with the first circuit, receives the second signal and transmits the second signal to the display equipment; the illuminance measuring device is integrated, and the sensor, the first circuit and the second circuit keep fixed relative positions.

Description

Illuminance measuring device

Technical Field

The application belongs to the technical field of environment measuring instruments, and particularly relates to an illumination measuring device.

Background

Illuminance refers to the luminous flux of visible light received per unit area, in lux, and is a quantity used to indicate the intensity of the light and the degree to which the surface area of an object is illuminated, and can be measured by an illuminometer.

The traditional illuminometer is generally composed of a probe and an instrument, is difficult to install during use and brings inconvenience to transportation, so that a technical scheme is necessary to solve the problems of difficult installation and inconvenient transportation of the illuminometer.

Disclosure of Invention

The present invention provides an illuminance measuring apparatus comprising:

the sensor is used for detecting the illuminance and outputting a first signal according to a detection result;

the first circuit is electrically connected with the sensor, receives a first signal output by the sensor, performs analog-to-digital conversion and outputs a second signal;

the second circuit is electrically connected with the first circuit, receives the second signal and transmits the second signal to the display equipment;

the illuminance measuring device is integrated, and the sensor, the first circuit and the second circuit keep fixed relative positions.

Further, the illuminance measurement apparatus further includes: the constant temperature cavity, the sensor sets up inside the constant temperature cavity, the constant temperature cavity will the operational environment of sensor maintains in fixed temperature range.

Further, the outer wall of the constant temperature cavity is provided with a heating belt, the heating belt heats the constant temperature cavity when being electrified, and when the constant temperature cavity reaches a fixed temperature range, the heating belt is powered off, wherein the fixed temperature range is 20-30 ℃.

Further, the illuminance measurement apparatus further includes: the light shading cylinder comprises at least three diaphragms which are coaxially arranged, and the light shading cylinder and the sensor are coaxially arranged.

Further, the display device is used for displaying the detection result of the sensor, and the display device displays at least 5 digits.

Furthermore, the display device is a touch screen, and the illuminance measuring device is calibrated and zeroed through the touch screen.

Further, the second circuit comprises a processor, and the processor is used for data processing and realizing automatic conversion of the four-gear tenfold relation range.

Further, the photocurrent measurement range of the sensor is 0.005 × 10^-7A—19999×10^-8A。

Further, the sensor includes a silicon photocell.

Further, the sensor is provided with a color filter in front, and the color filter is used for correcting a human visual function V (lambda) of a light sensitivity response curve of the silicon photocell.

The application provides an illuminance measuring device installation convenient operation, transportation are convenient, the appearance is pleasing to the eye.

Drawings

FIG. 1 is a schematic view of an illuminance measuring device according to the present application;

fig. 2 is a schematic diagram of a first and a second circuit of the present application.

Detailed Description

The present invention will be described in detail with reference to the specific embodiments shown in the drawings, which are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the specific embodiments are included in the scope of the present invention.

As shown in fig. 1, the present application provides an illuminance measurement device including: sensor 1, first circuit 4 and second circuit 5. The sensor 1 is configured to detect illuminance and output a first signal according to a detection result. The first circuit 4 is electrically connected with the sensor 1, receives a first signal output by the sensor 1, performs analog-to-digital conversion, and outputs a second signal. The second circuit 5 is electrically connected to the first circuit 4, receives the second signal and transmits the second signal to the display device 6. The illuminance measuring device is an integrated device, and the sensor 1, the first circuit 4, and the second circuit 5 are kept fixed relative to each other.

As an alternative implementation, the first circuit 4 comprises a current-to-voltage conversion circuit, as shown in fig. 2. The current signal generated by the sensor 1 through light irradiation is converted into a voltage signal by a current-voltage conversion circuit. The first circuit 4 further comprises an amplification circuit by which the voltage signal is amplified. The first circuit 4 further comprises an analog-to-digital conversion circuit which converts the amplified voltage signal into a form of a digital signal.

As an alternative implementation, the second circuit 5 comprises a processor for data processing. The second circuit 5 is electrically connected to the display device 6, and the second circuit 5 displays the received second signal on the display device 6 after data processing. In an implementation manner provided by the present application, the second signal is a digital signal converted after the voltage signal is amplified.

As an alternative implementation, the second circuit 5 is provided with a communication interface for communication connection with an external computer. Optionally, the communication interface may be an RS-485 communication interface.

As an alternative implementation, the display device 6 may be a touch screen. Can demonstrate key panel on the touch-sensitive screen, through operating key panel, can realize calibrating, zero calibration to the illuminance measuring device that this application provided.

As an alternative implementation, the display device 6 is used for displaying the detection result of the sensor 1, and the display device 6 displays at least 5 digits.

As an optional implementation manner, the processor in the second circuit 5 performs data processing on the second signal, so as to implement automatic conversion of the fourth ten-fold relational range. This design can improve the display accuracy of the illuminance measuring apparatus.

As an alternative implementation, the sensor 1 may comprise a silicon photocell, which, when illuminated by light, converts the light energy into electrical energy, according to the photoelectric effect, thereby causing a current to flow in the circuit. The intensity of the generated current is in a certain proportional relation with the illuminance, so that the illuminance can be quantitatively detected by detecting the current.

The key influencing the test accuracy of various photometric physical quantities is the correction of a human eye visual function V (lambda) of a light sensitivity response curve of a detector. Because the silicon photocell has good long-term stability and long service life, the silicon photocell has been widely used in photometric tests to replace selenium photocells, but the spectral sensitivity response curve of the silicon photocell is greatly different from the CIE1931 standard human eye vision function V (lambda). The level of correction of the human eye vision function V (lambda) of the light sensitivity response curve directly influences the testing precision of the instrument. As an alternative implementation, the present application incorporates a color filter in front of the sensor 1, which is used to modify the human eye's visual function V (λ) of the light sensitivity response curve of the silicon photocell.

According to the temperature characteristics of the silicon photocell, the open-circuit voltage of the silicon photocell decreases along with the temperature rise of the working environment, and the short-circuit current increases slowly along with the temperature rise. Therefore, for a silicon photocell, the temperature of the working environment is an important index affecting the measurement accuracy or the control accuracy thereof. When a silicon photocell is used as the detection element, it is necessary to take into account the influence of temperature drift.

As an alternative implementation manner, the illuminance measurement device provided by the present application further includes a thermostatic chamber 2. The sensor 1 is arranged inside the thermostatic chamber 2, and the thermostatic chamber 2 maintains the working environment of the sensor 1 within a fixed temperature range. The variation of the measurement accuracy of the illuminance measurement device due to the variation of the operating environment temperature of the sensor 1 is attenuated to some extent.

As an alternative realization, a heating belt 3 can be arranged on the outer wall of the thermostatic chamber 2. When the heating belt 3 is energized, the heating belt 3 works to heat the thermostatic chamber 2. When the thermostatic chamber 2 reaches a fixed temperature range, the heating belt 3 is powered off, and the heating belt 3 stops working at the moment. Wherein the fixed temperature range is 20-30 ℃.

As another alternative implementation manner, the temperature of the thermostatic chamber 2 may be set, the heating belt 3 stops operating when the temperature in the thermostatic chamber 2 reaches a preset value, and the heating belt 3 starts operating again when the temperature in the thermostatic chamber 2 is lower than the preset value. In this way, the temperature in the thermostatic chamber 2 can be maintained in a more precise temperature range, so that the influence of the temperature of the working environment on the measurement accuracy of the sensor 1 is further weakened.

The traditional illuminometer is generally composed of a probe and a meter, is difficult to install when in use and brings inconvenience to transportation. As an alternative implementation, the present application provides an integrated illuminance measurement device. As shown in fig. 1, the present application fixedly connects the first circuit 4 to the thermostatic chamber 2 at the time of design, so that the first circuit 4 and the sensor 1 maintain a fixed relative position. The second circuit 5 is connected to the housing of the illuminance measuring device provided in the present application, so that the sensor 1, the first circuit 4, and the second circuit 5 maintain a fixed relative position therebetween. The design can effectively reduce the cost, the product transportation is convenient, and the appearance of the product is attractive.

The illuminometer is easy to be affected by stray light when the light source works on site, so that the final measurement result is not accurate enough. In order to effectively eliminate the interference of stray light and improve the measurement accuracy of the illuminometer, as an optional implementation mode, the illuminance measurement device provided by the application further comprises a shading cylinder 7. The light shielding cylinder 7 comprises at least three diaphragms which are coaxially arranged, and the light shielding cylinder 7 is coaxially arranged with the sensor 1. The diaphragm is an entity which plays a role in limiting light beams in an optical system, the function of the diaphragm can be divided into two aspects, one is to limit the size of the light beams, the other is to limit the size of a field of view, and the diaphragm is divided into an aperture diaphragm and a field of view diaphragm according to the function of the diaphragm. For convenience of description, the aperture stops are a first stop 71, a second stop 72, and a third stop 73, respectively.

For ease of explanation, reference directions to the embodiments provided in the present application are preferably defined herein. In the embodiment provided by the present application, when the illuminance measuring apparatus is operated, the direction of the incident light path is taken as the positive reference direction. In the positive reference direction, the incident light ray passes through the first diaphragm 71, the second diaphragm 72, the third diaphragm 73 in this order, and finally reaches the sensor 1. The clear aperture of the first diaphragm 71 is larger than that of the second diaphragm 72, and the clear aperture of the second diaphragm 72 is larger than that of the third diaphragm 73.

As an optional implementation manner, in order to avoid that the light reflected by the inner wall affects the detection precision, the inner wall of the light shielding cylinder 7 may be blackened.

As an optional implementation manner, it is avoided that the light emitted by the light source to be measured is reflected by the light shielding cylinder 7 due to the smooth inner wall, so as to affect the measurement accuracy. Therefore, the inner wall of the light shielding cylinder 7 is provided with the extinction threads, the roughness of the inner wall of the light shielding cylinder 7 is increased, the reflected light of the inner wall is changed into diffuse reflection, and the influence of stray light is eliminated.

As an alternative implementation, the photocurrent measurement range of the sensor 1 is 0.005 × 10^-7A—19999×10^-8A。

The application provides an illuminance measuring device's rated operating condition does: temperature: 25. + -. 5 ℃ humidity: less than or equal to 85% R.H, power supply AC 220V +/-10V, 50Hz +/-1 Hz.

The allowable working conditions of the illuminance measuring device provided by the application are as follows: temperature: 0-40 ℃, humidity: less than or equal to 90% r.h, supply: AC 220V +/-10%, 50/60 Hz;

the above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still fall within the protection scope of the technical spirit of the present invention.

Claims (10)

1. An illuminance measurement device, characterized in that: comprises that

The sensor is used for detecting the illuminance and outputting a first signal according to a detection result;

the first circuit is electrically connected with the sensor, receives a first signal output by the sensor, performs analog-to-digital conversion and outputs a second signal;

the second circuit is electrically connected with the first circuit, receives the second signal and transmits the second signal to the display equipment;

the illuminance measuring device is integrated, and the sensor, the first circuit and the second circuit keep fixed relative positions.

2. The illuminance measurement device according to claim 1, characterized by further comprising: the constant temperature cavity, the sensor sets up inside the constant temperature cavity, the constant temperature cavity will the operational environment of sensor maintains in fixed temperature range.

3. The illuminance measurement device according to claim 2, characterized in that: the outer wall of the constant temperature cavity is provided with a heating belt, the heating belt heats the constant temperature cavity when being electrified, and when the constant temperature cavity reaches a fixed temperature range, the heating belt is powered off, wherein the fixed temperature range is 20-30 ℃.

4. The illuminance measurement device according to claim 1, characterized by further comprising: the light shading cylinder comprises at least three diaphragms which are coaxially arranged, and the light shading cylinder and the sensor are coaxially arranged.

5. The illuminance measurement device according to claim 1, characterized in that: the display device is used for displaying the detection result of the sensor, and the display device at least displays 5 digits.

6. The illuminance measurement device according to claim 5, characterized in that: the display device is a touch screen, and the illuminance measuring device is calibrated and zeroed through the touch screen.

7. The illuminance measurement device according to claim 5, characterized in that: the second circuit comprises a processor, and the processor is used for data processing and realizing automatic conversion of a fourth-gear ten-fold relation range.

8. The illuminance measurement device according to claim 1, characterized in that: the photocurrent measurement range of the sensor is 0.005 × 10^-7A—19999×10^-8A。

9. The illuminance measurement device according to claim 1, characterized in that: the sensor includes a silicon photocell.

10. The illuminance measurement device according to claim 9, characterized in that: the sensor is provided with a color filter in front, and the color filter is used for correcting a human visual function V (lambda) of a light sensitivity response curve of the silicon photocell.

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