CN220552526U - Photosensitive sensor calibration circuit - Google Patents
Photosensitive sensor calibration circuit Download PDFInfo
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- CN220552526U CN220552526U CN202222265221.4U CN202222265221U CN220552526U CN 220552526 U CN220552526 U CN 220552526U CN 202222265221 U CN202222265221 U CN 202222265221U CN 220552526 U CN220552526 U CN 220552526U
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Abstract
The utility model relates to a photosensitive sensor calibration circuit, which is characterized in that: the circuit comprises: the photoelectric analog sensor conditioning circuit (1), the multipath photoelectric digital sensor interface circuit (2), the power-controllable full-wavelength linear LED lamp source (3), the standard illuminance detection reference circuit (4) and the control circuit (5), wherein the photoelectric analog sensor conditioning circuit (1), the multipath photoelectric digital sensor interface circuit (2), the power-controllable full-wavelength linear LED lamp source (3) and the standard illuminance detection reference circuit (4) are respectively and electrically connected with the control circuit (5) through interface circuits, and the control circuit (5) is further electrically connected with an input/output interface circuit and a communication interface circuit through interfaces. The photosensor calibration circuit can adapt to the calibration of a common photosensor, and improves the quality of optical products related to photosensor application.
Description
Technical Field
The utility model relates to a photosensitive sensor calibration circuit, belonging to the field of signal detection and analysis.
Background
The photosensitive sensor has wide application prospect in the occasions such as aviation instruments, medical instruments, laboratory equipment, photographic analysis systems, smoke detection, high-performance liquid crystal display screen backlight detection and the like. Currently, there are two main types of photosensitive sensors:
(1) a photo-receiving diode or photo-receiving triode of the discrete component;
(2) integrated with an integrated analog or digital photosensitive device.
However, currently, the user's precision calibration and detection methods for such "photo sensors" lack systematic measurement tools or means.
Disclosure of Invention
The utility model aims to provide a photosensitive sensor calibration circuit which can adapt to the calibration of a common photosensitive sensor and improve the quality of optical products related to the application of the photosensitive sensor.
The utility model aims to achieve the purpose in this way, and relates to a photosensitive sensor calibration circuit, which is characterized in that: the circuit comprises: the photoelectric analog sensor conditioning circuit, the multi-path photoelectric digital sensor interface circuit, the full-wavelength linear LED light source with controllable power, the standard illuminance detection reference circuit and the control circuit are respectively and electrically connected with the control circuit interface circuit through interfaces, wherein the control circuit is further electrically connected with the input/output interface circuit and the communication interface circuit through the interfaces.
The photoelectric analog sensor conditioning circuit comprises: the optical signal detection amplifying circuit comprises a light signal detection amplifying circuit formed by a light sensitive diode, an optical signal detection amplifying circuit formed by a light sensitive diode and a photoelectric analog integrated circuit, the optical signal detection amplifying circuit formed by the light sensitive diode and the photoelectric analog integrated circuit, the three paths of optical signal detection amplifying circuits respectively enter a 4-out-of-1 dual-channel analog switch, the output end of the 4-out-of-1 dual-channel analog switch is subjected to differential amplification and then enters the A/D input end of a control circuit for processing, the channel selection end of the 4-out-of-1 dual-channel analog switch is also electrically connected with two I/O port ends of the control circuit, and the channel selection is carried out by the two I/O port ends of the control circuit.
The optical signal detection amplifying circuit composed of the photodiodes includes: the digital photodiode signal processing circuit comprises a photodiode 1V1, a capacitor 1C1, a first operational amplifier 1U1, resistors 1R1, 1R2 and 1R3, wherein the capacitor 1C1 and the resistor 1R1 are connected between the negative end and the output end of the first operational amplifier 1U1 in a bridging mode, the photodiode 1V1 is electrically connected with the negative phase and the positive phase end of the first operational amplifier 1U1, the resistors 1R2 and 1R3 are connected between the output end and the ground in series, the amplification factor of the photodiode 1V1 is controlled by selecting the resistance value of the 1R1, the output of the 1U1 is divided by the 1R2 and 1R3, and the signals at the two ends a1 and a2 of the 1R2 are subjected to differential analog-digital conversion 1U5 under the gating of a multipath analog switch 1U 4.
The optical signal detection amplifying circuit formed by the photosensitive transistor comprises: the output of the load resistor 1R4 and the filter capacitor 1C2 serving as the emitter follower of the photosensitive transistor 1V2 is subjected to impedance change by the second operational amplifier 1U2, the input voltage-dividing resistor 1R6 is sampled and entered, the input is gated by the multipath analog switch 1U4, and the differential analog-to-digital conversion 1U5 is carried out, so that the signals of the photosensitive transistor are obtained.
The photoelectric analog integrated circuit 1U3 is divided by the resistors 1R7 and 1R8 under the gating of the 4-select 1 double-channel analog switch 1U4, and the digital signal of the integrated analog photosensitive device is obtained by the differential analog-to-digital conversion 1U 5.
A 4-to-1 two-channel analog switch 1U4 or a two-way 4-to-1 analog switch such as CD4052.
The controllable full wavelength linear LED lamp source of power includes: the PWM signal-controlled analog output signal and the power LED drive circuit, wherein the PWM signal-controlled analog output signal comprises: the first operational amplifier buffer amplifier 3U1 and the second operational amplifier buffer amplifier 3U2 are formed in cascade, the PWM T1 signal from the control circuit is amplified by 2 times by the first operational amplifier buffer amplifier 3U1, first-stage filtering is carried out through a 310k resistor and a 1UF capacitor, second-stage smoothing filtering is carried out through a 420k resistor and a 2.2UF capacitor, the direct current component with the positive width T1Z ratio of the PWM T1 is detected, and the direct current component is buffered through the 3U2 operational amplifier and then is sent to the fan driving circuit.
The power LED driving circuit includes: the power type N-channel MOS transistors 3V1 and 3V2, the two paths of power type operation and release buffer circuits 3U3 and 3U4 and the power LED, the size of V3 from the power type operation and release buffer circuits 3U3 and 3U4 are respectively controlled by the output of the power type N-channel MOS transistors 3V1 and 3V2 after the direct current level is controlled by the size of V3 from the power type operation and release buffer circuits 3U3 and 3U4, and the grid electrode of the power type N-channel connected by the power type N-channel MOS transistors 3V1 and 3V2 in parallel is respectively controlled by the output drive A and the drive B after the power type operation and release buffer circuits 3U3 and 3U 4.
The standard illuminance detection reference circuit adopts an illuminance meter.
The control circuit is an ARM processor.
The utility model has the advantages that: the utility model adopts a photoelectric analog sensor conditioning circuit 1, a multipath photoelectric digital sensor interface circuit 2, a power controllable full-wavelength linear LED lamp source 3, a standard illumination detection reference circuit 4 and a control circuit 5 to form a photosensitive sensor calibration circuit and detection, takes the light source intensity of an LED as an output quantity and takes a standard illumination signal as a comparison quantity, carries out curve fitting from small to large through a software PID (proportion integration differentiation) adjustment algorithm, and carries out digital difference between the detected photosensitive sensor signal and a standard curve to obtain a calibration curve coefficient and an accuracy value, thereby being capable of accurately improving the quality of optical products related to photosensitive sensor application.
The utility model will be further described with reference to examples and figures.
Drawings
FIG. 1 is a schematic block diagram of a circuit of an embodiment of the present utility model;
FIG. 2 is a multi-channel photoelectric analog sensor conditioning circuit;
FIG. 3 is a schematic diagram of an analog output signal of PWM signal control;
fig. 4 is a schematic diagram of a power LED driving circuit.
1, a photoelectric analog sensor conditioning circuit; 2. a multi-path photoelectric digital sensor interface circuit; 3. a power controllable full-wavelength linear LED lamp source; 4. a standard illuminance detection reference circuit; 5. and a control circuit.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the present utility model relates to a photosensitive sensor calibration circuit, which is characterized in that: the circuit comprises: the photoelectric analog sensor conditioning circuit 1, the multipath photoelectric digital sensor interface circuit 2, the power controllable full-wavelength linear LED lamp source 3, the standard illuminance detection reference circuit 4 and the control circuit 5 are respectively and electrically connected with the control circuit 5 through interface circuits, wherein the control circuit 5 is further electrically connected with the input/output interface circuit and the communication interface circuit through interfaces.
As shown in fig. 2, the conditioning circuit 1 of the photoelectric analog sensor includes: the optical signal detection amplifying circuit is composed of a light-sensitive diode, an optical signal detection amplifying circuit and a photoelectric analog integrated circuit, wherein the optical signal detection amplifying circuit is composed of a light-sensitive diode, and the photoelectric analog integrated circuit is composed of a photoelectric analog integrated circuit, the three paths of optical signal detection amplifying circuits respectively enter a 4-1-choice two-channel analog switch, the output end of the 4-1-choice two-channel analog switch is amplified by a difference and then enters the A/D input end of the control circuit 5 for processing, the channel selection end of the 4-1-choice two-channel analog switch is electrically connected with two I/O port ends of the control circuit 5, and the channel selection is carried out by the two I/O port ends of the control circuit 5.
In fig. 2, an optical signal detection amplifying circuit constituted by photodiodes includes: the photodiode 1V1 is electrically connected with the negative phase and the positive phase of the first operational amplifier 1U1, the resistors 1R2 and 1R3 are connected in series between the output end and the ground, and the amplification factor of the photodiode 1V1 is controlled by selecting the resistance value of 1R 1. The output of the 1U1 is divided by 1R2 and 1R3, and the signals a1 and a2 at two ends of the 1R2 are gated by a multi-path analog switch 1U4 after the division, and the digital photodiode signal is obtained by differential analog-digital conversion 1U 5.
In fig. 2, an optical signal detection amplifying circuit formed by a light-sensitive transistor includes: the output of the load resistor 1R4 and the filter capacitor 1C2 serving as the emitter follower of the photosensitive transistor 1V2 is subjected to impedance change by the second operational amplifier 1U2, the input voltage-dividing resistor 1R6 is sampled and entered, the input is gated by the multipath analog switch 1U4, and the differential analog-to-digital conversion 1U5 is carried out, so that the signals of the photosensitive transistor are obtained.
In fig. 2, the optoelectronic analog integrated circuit 1U3 is divided by resistors 1R7 and 1R8 and is gated by a 4-select 1 two-channel analog switch 1U4, and a digital signal of the integrated analog photosensitive device is obtained by differential analog-to-digital conversion 1U 5.
A 4-to-1 two-channel analog switch 1U4 or a two-way 4-to-1 analog switch such as CD4052.
The multipath photoelectric digital sensor interface circuit 2 adopts standard I 2 C bus interface, rate up to 1MHz, considering I 2 Compatibility of C bus, the utility model pulls up 6.8k of electricity on SDA and SCL two lines (see figure 1)To ensure that multiple devices share connections. The photoelectric data of each digital sensor is read by the MCU setting drive.
As shown in fig. 3, the power controllable full-wavelength linear LED lamp source 3 includes: the PWM signal-controlled analog output signal and the power LED drive circuit, wherein the PWM signal-controlled analog output signal comprises: the first operational amplifier 3U1 and the second operational amplifier 3U2 are formed in cascade, and in order to calibrate the linear range and accuracy of the "photosensitive sensor", a controllable linear stable light source must be output in the embodiment of the present utility model, and under the control of the control circuit 5, the controllable linear stable light source outputs a stable LED driving signal through the conversion of the PWM signal by the duty ratio.
The PWM T1 signal from the control circuit 5 is amplified by 2 times by the first operational amplifier 3U1, is subjected to first-stage filtering by a 310k resistor (3R 3) and a 1UF capacitor (3C 1), is subjected to second-stage smooth filtering by a 420k resistor (3R 4) and a 2.2UF capacitor (3C 2), and is detected to be a direct current component with the positive width T1Z ratio of the PWM T1, and is buffered by the 3U2 operational amplifier and then is sent to a fan driving circuit. The positive width T1Z of T1 is proportional to the dc component detected by the filter. Namely: the wider T1Z the higher the V3 amplitude.
The power LED driving circuit is shown in figure 4,
the power LED driving circuit is shown in fig. 4, and includes: the power type N-channel MOS transistors 3V1 and 3V2, the two paths of power type operation and release buffer circuits 3U3 and 3U4 and the power LED, the size of V3 from the power type operation and release buffer circuits 3U3 and 3U4 are respectively controlled by the output of the power type N-channel MOS transistors 3V1 and 3V2 after the direct current level is controlled by the size of V3 from the power type operation and release buffer circuits 3U3 and 3U4, and the grid electrode of the power type N-channel connected by the power type N-channel MOS transistors 3V1 and 3V2 in parallel is respectively controlled by the output drive A and the drive B after the power type operation and release buffer circuits 3U3 and 3U 4.
Due to the independent functions of the drive A and the drive B, the 3V1 and the 3V2 cannot influence the total power of the 3V1 and the 3V2 after being connected in parallel due to the performance difference of the device. As can be seen from FIG. 4, V3 is inversely proportional to UDS, and is applied to the power supply U of the LED M Is Ucc-U DS When V3 increases, U DS Reduction, U M In increasing, conversely, when V3 decreases, U DS The number of the cells to be processed is increased,U M namely, the LED lamp is reduced, and the LED lamp is automatically adjusted under the action of V3. In order to make LED lamp power supply U M The 3C5 should select an electrolytic capacitor of 470uF or more for energy storage and filtering.
The standard illuminance detection reference circuit 4 adopts an illuminance meter, and in order to obtain the comparison between the signal output values of the photoelectric analog sensor conditioning circuit 1 and the multipath photoelectric digital sensor interface circuit 2 and the standard measured values, an international standard illuminance meter instrument is adopted as a calibration basis.
The signal from the same light source is automatically fitted and corrected by the output of the photosensitive sensor to be tested and the output of the illuminance meter signal, and the MCU outputs data such as measurement calibration coefficient, measurement correction curve, measurement error, measurement grade and the like.
The control circuit 5 is an ARM processor comprising I 2 The input/output interface circuit and the communication interface circuit respectively adopt RJ45 network communication, an LCD liquid crystal display screen and keys. Under the control of embedded bottom software, the system is realized in the operations of multi-path photoelectric sensor training detection, comparison, calibration calculation and the like.
In order to realize the calibration precision of the photosensitive sensor, the utility model uses the light source intensity of the LED of 1-12 ten thousand lumens as the output quantity, uses the standard illuminance signal as the comparison quantity, carries out curve fitting from small to large through a software PID (proportion integration differentiation) adjustment algorithm, and carries out digital difference between the measured photosensitive sensor signal and the standard curve to obtain the calibration curve coefficient and the precision value.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, such changes and modifications are also intended to be within the scope of the utility model.
Claims (10)
1. A photosensitive sensor calibration circuit is characterized in that: the circuit comprises: the photoelectric analog sensor conditioning circuit (1), the multipath photoelectric digital sensor interface circuit (2), the power-controllable full-wavelength linear LED lamp source (3), the standard illuminance detection reference circuit (4) and the control circuit (5), wherein the photoelectric analog sensor conditioning circuit (1), the multipath photoelectric digital sensor interface circuit (2), the power-controllable full-wavelength linear LED lamp source (3) and the standard illuminance detection reference circuit (4) are respectively and electrically connected with the control circuit (5) through interface circuits, and the control circuit (5) is further electrically connected with an input/output interface circuit and a communication interface circuit through interfaces.
2. The photosensitive sensor calibration circuit of claim 1, wherein: the photoelectric analog sensor conditioning circuit (1) comprises: the optical signal detection amplifying circuit is composed of a light-sensitive diode, an optical signal detection amplifying circuit and a photoelectric analog integrated circuit, wherein the optical signal detection amplifying circuit is composed of a light-sensitive diode, and the optical signal detection amplifying circuit is composed of a photoelectric analog integrated circuit, the three paths of optical signal detection amplifying circuits respectively enter a 4-1-choice two-channel analog switch, the output end of the 4-1-choice two-channel analog switch is subjected to differential amplification and then enters the A/D input end of a control circuit (5) for processing, the channel selection end of the 4-1-choice two-channel analog switch is also electrically connected with two I/O port ends of the control circuit (5), and the channel selection is carried out by the two I/O port ends of the control circuit (5).
3. The photosensitive sensor calibration circuit of claim 2, wherein: the optical signal detection amplifying circuit composed of the photodiodes includes: the photodiode 1V1 is electrically connected with the negative phase and the positive phase of the first operational amplifier 1U1, the resistors 1R2 and 1R3 are connected in series between the output end and the ground, and the amplification factor of the photodiode 1V1 is controlled by selecting the resistance value of 1R 1; the output of the 1U1 is divided by 1R2 and 1R3, and the signals a1 and a2 at two ends of the 1R2 are gated by a multi-path analog switch 1U4 after the division, and the digital photodiode signal is obtained by differential analog-digital conversion 1U 5.
4. The photosensitive sensor calibration circuit of claim 2, wherein: the optical signal detection amplifying circuit formed by the photosensitive transistor comprises: the output of the load resistor 1R4 and the filter capacitor 1C2 serving as the emitter follower of the photosensitive transistor 1V2 is subjected to impedance change by the second operational amplifier 1U2, the input voltage-dividing resistor 1R6 is sampled and entered, the input is gated by the multipath analog switch 1U4, and the differential analog-to-digital conversion 1U5 is carried out, so that the signals of the photosensitive transistor are obtained.
5. The photosensitive sensor calibration circuit of claim 2, wherein: the photoelectric analog integrated circuit 1U3 is divided by the resistors 1R7 and 1R8 under the gating of the 4-select 1 double-channel analog switch 1U4, and the digital signal of the integrated analog photosensitive device is obtained by the differential analog-to-digital conversion 1U 5.
6. The photosensitive sensor calibration circuit of claim 2, wherein: a 4-to-1 two-channel analog switch 1U4 or a two-way 4-to-1 analog switch such as CD4052.
7. The photosensitive sensor calibration circuit of claim 1, wherein: the power-controllable full-wavelength linear LED lamp source (3) comprises: the PWM signal-controlled analog output signal and the power LED drive circuit, wherein the PWM signal-controlled analog output signal comprises: the first operational amplifier buffer amplifier 3U1 and the second operational amplifier buffer amplifier 3U2 are formed in cascade, the PWM T1 signal from the control circuit (5) is amplified by 2 times by the first operational amplifier 3U1, and is subjected to first-stage filtering through a 310k resistor and a 1UF capacitor, is subjected to second-stage smooth filtering through a 420k resistor and a 2.2UF capacitor, and is subjected to positive width T1Z ratio direct current component of the PWM T1, and is buffered through the 3U2 operational amplifier and then is sent to the fan driving circuit.
8. The photosensitive sensor calibration circuit of claim 7, wherein: the power LED driving circuit includes: the power type N-channel MOS transistors 3V1 and 3V2, the two paths of power type operation and release buffer circuits 3U3 and 3U4 and the power LED, the size of V3 is controllable in direct current level, after the two paths of power type operation and release buffer circuits 3U3 and 3U4 are respectively passed through, the outputs of the 3U3 and 3U4 respectively control the two power type N-channel MOS transistors 3V1 and 3V2, and the outputs after the power type operation and release buffer circuits 3U3 and 3U4 drive A and drive B respectively control the grid electrodes of the power type N-channel connected in parallel by the 3V1 and 3V 2.
9. The photosensitive sensor calibration circuit of claim 1, wherein: the standard illuminance detection reference circuit (4) uses an illuminance meter.
10. The photosensitive sensor calibration circuit of claim 7, wherein: the control circuit (5) is an ARM processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222265221.4U CN220552526U (en) | 2022-08-28 | 2022-08-28 | Photosensitive sensor calibration circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222265221.4U CN220552526U (en) | 2022-08-28 | 2022-08-28 | Photosensitive sensor calibration circuit |
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| CN220552526U true CN220552526U (en) | 2024-03-01 |
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| CN202222265221.4U Active CN220552526U (en) | 2022-08-28 | 2022-08-28 | Photosensitive sensor calibration circuit |
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| CN (1) | CN220552526U (en) |
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- 2022-08-28 CN CN202222265221.4U patent/CN220552526U/en active Active
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