CN218445113U - Photoelectric detection device for monitoring ambient air quality - Google Patents
Photoelectric detection device for monitoring ambient air quality Download PDFInfo
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- CN218445113U CN218445113U CN202222442206.2U CN202222442206U CN218445113U CN 218445113 U CN218445113 U CN 218445113U CN 202222442206 U CN202222442206 U CN 202222442206U CN 218445113 U CN218445113 U CN 218445113U
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Abstract
The utility model discloses a photoelectric detection device for ambient air quality monitoring, including photoelectric detection sensor, signal processing module and data acquisition module, signal processing module includes two fortune and puts compensation regulating circuit and differential amplification regulating circuit, data acquisition module includes AD converter and microprocessor, microprocessor still is connected with the display through data bus; the utility model discloses a signal processing module takes care of the detected signal of photoelectric detection sensor, utilizes two fortune to put the compensation and adjusts the work stable state that effectively guarantees triode VT1 to utilize the differential amplification principle can avoid the temperature drift phenomenon out of order among the detected signal processing well, promote the stability and the precision that detected signal enlargies, promote photoelectric detection device's measurement accuracy.
Description
Technical Field
The utility model relates to an air quality detection device technical field especially relates to a photoelectric detection device for ambient air quality monitoring.
Background
With the rapid development of industry and the rapid increase of vehicles, air pollution becomes a very prominent problem. In order to better control and treat pollution and improve the quality of the atmosphere, the atmosphere needs to be monitored in real time, and the degree of the atmospheric pollution needs to be known and mastered in time. The optical and spectroscopic technology becomes an ideal tool for monitoring the atmospheric environment by the large-range, high-sensitivity and multi-component complete non-contact online detection capability, wherein a photoelectric detection sensor becomes a core component commonly used in portable and fixed detection instruments, various organic compounds and some inorganic gases in the ambient air can be detected, and the photoelectric detection sensor adopts analog current/voltage signal output, but the existing photoelectric detection device has temperature drift imbalance phenomenon in the detection signal processing process, so that the detection signal is not accurately amplified, and the detection result has deviation.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
To the above situation, in order to overcome the defects of the prior art, an object of the present invention is to provide a photoelectric detection device for monitoring the quality of ambient air.
The technical scheme for solving the problem is as follows: a photoelectric detection device for ambient air quality monitoring, including photoelectric detection sensor, signal processing module and data acquisition module, the signal processing module includes that compensation regulating circuit and differential amplification regulating circuit are put to two fortune, compensation regulating circuit's input is put to two fortune is connected photoelectric detection sensor's signal output part, compensation regulating circuit's output is put to two fortune is connected differential amplification regulating circuit's input, differential amplification regulating circuit's output is connected data acquisition module, data acquisition module includes AD converter and microprocessor, microprocessor still has the display through data bus connection.
Preferably, the dual operational amplifier compensation adjusting circuit comprises an operational amplifier AR1 and an operational amplifier AR2, an inverting input terminal of the operational amplifier AR1 is connected to the signal output terminal of the photoelectric detection sensor through a resistor R1 and is grounded through a capacitor C1, a non-inverting input terminal of the operational amplifier AR1 is grounded through a resistor R2 and is connected to the non-inverting input terminal of the operational amplifier AR1 and the first input terminal of the differential amplification adjusting circuit through a resistor R3; the inverting input end of the operational amplifier AR2 is connected with the inverting input end of the operational amplifier AR1 through a resistor R4, and is connected with the output end of the operational amplifier AR2 and the second input end of the differential amplification regulating circuit through a capacitor C3, and the non-inverting input end of the operational amplifier AR2 is grounded through a capacitor C2.
Preferably, the differential amplification regulating circuit comprises a triode VT1, a collector of the triode VT1 is connected to a first input terminal of the differential amplification regulating circuit, a base of the triode VT1 is connected to a second input terminal of the differential amplification regulating circuit and a cathode of the zener diode DZ1, an anode of the zener diode DZ1 is grounded, an emitter of the triode VT1 is connected to one end of the capacitor C4 and the a/D converter through the varistor RP1, and the other end of the capacitor C4 is grounded.
Preferably, the photoelectric detection sensor is a PID-TECH photoionization sensor eVx.
Through the technical scheme, the beneficial effects of the utility model are that: the utility model discloses a signal processing module takes care of the detected signal of photoelectric detection sensor, utilizes two fortune to put the compensation and adjusts the work stable state that effectively guarantees triode VT1 to utilize the differential amplification principle can avoid the temperature drift phenomenon of adjusting well among the detected signal processing, promote the stability and the precision that the detected signal enlargies, promote photoelectric detection device's measurement accuracy.
Drawings
Fig. 1 is a block diagram of the system of the present invention.
Fig. 2 is a schematic circuit diagram of the signal processing module of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings in which fig. 1 through 2 are shown. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in figure 1, the photoelectric detection device for monitoring the ambient air quality comprises a photoelectric detection sensor, a signal processing module and a data acquisition module, wherein the signal processing module comprises a double-operational amplifier compensation adjusting circuit and a differential amplification adjusting circuit, the input end of the double-operational amplifier compensation adjusting circuit is connected with the signal output end of the photoelectric detection sensor, the output end of the double-operational amplifier compensation adjusting circuit is connected with the input end of the differential amplification adjusting circuit, the output end of the differential amplification adjusting circuit is connected with the data acquisition module, the data acquisition module comprises an A/D converter and a microprocessor, and the microprocessor is further connected with a display through a data bus.
As shown in fig. 2, the dual operational amplifier compensation adjusting circuit includes an operational amplifier AR1 and an operational amplifier AR2, an inverting input terminal of the operational amplifier AR1 is connected to the signal output terminal of the photoelectric detection sensor through a resistor R1 and is grounded through a capacitor C1, a non-inverting input terminal of the operational amplifier AR1 is grounded through a resistor R2 and is connected to the non-inverting input terminal of the operational amplifier AR1 and the first input terminal of the differential amplification adjusting circuit through a resistor R3; the inverting input end of the operational amplifier AR2 is connected with the inverting input end of the operational amplifier AR1 through a resistor R4, and is connected with the output end of the operational amplifier AR2 and the second input end of the differential amplification regulating circuit through a capacitor C3, and the non-inverting input end of the operational amplifier AR2 is grounded through a capacitor C2.
Furthermore, the differential amplification regulating circuit comprises a triode VT1, a collector of the triode VT1 is connected with a first input end of the differential amplification regulating circuit, a base of the triode VT1 is connected with a second input end of the differential amplification regulating circuit and a cathode of a voltage stabilizing diode DZ1, an anode of the voltage stabilizing diode DZ1 is grounded, an emitter of the triode VT1 is connected with one end of a capacitor C4 and the A/D converter through a rheostat RP1, and the other end of the capacitor C4 is grounded.
When the utility model is used in concrete, the photoelectric detection sensor in the photoelectric detection device can adopt a PID-TECH photoelectric ionization sensor eVx, has the analog voltage signal output of 0.045V to 2.5V, and can also adopt other photoelectric detection sensor models with analog signal output; in order to ensure the accuracy of the amplification processing of the detection signal, the detection signal is conditioned by adopting a signal processing module, and the specific working principle is as follows: firstly, the dual operational amplifier compensation regulating circuit performs low-pass noise reduction on an output signal of the photoelectric detection sensor by adopting RC filtering to eliminate external interference clutter intrusion, and then sends the signal into an operational amplifier AR1 and an operational amplifier AR2 respectively in two paths for shunt amplification, wherein the operational amplifier AR1 rapidly improves the intensity of the detection signal by using the inverse amplification principle, and the operational amplifier AR2 adds a capacitor C3 in the amplification process to form electric feedback compensation so as to ensure the continuous stability of the output signal of the operational amplifier AR2, and meanwhile, the capacitor C2 also has good thermal noise suppression effect so as to avoid generating amplification null shift; secondly, the output signals of the operational amplifier AR1 and the operational amplifier AR2 are differentially amplified by the triode VT1 in the differential amplification regulating circuit, the base electrode of the triode VT1 is driven by the output signal of the operational amplifier AR2, so that the work steady state of the triode VT1 can be well ensured, and the base electrode conducting signal of the triode VT1 is stabilized by the zener diode DZ1, so that the stability of the source electrode output signal of the triode VT1 is greatly improved, and finally, the base electrode conducting signal is sent into an A/D converter for analog-to-digital conversion after RC filtering to form a digital quantity signal which can be identified by a microprocessor, environmental air quality data are obtained by the microprocessor through analysis, and the data result is sent to a display for display, so that a user can conveniently check the environmental air quality data.
To sum up, the utility model discloses a signal processing module takes care of the detected signal of photoelectric detection sensor, utilizes two fortune to put the compensation and adjust the work stable state of effectively guaranteeing triode VT1 to utilize the differential amplification principle can avoid the temperature drift imbalance phenomenon among the detected signal processing well, promote the stability and the precision that detected signal enlargies, promote photoelectric detection device's measurement accuracy.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (4)
1. A photoelectric detection device for ambient air quality monitoring, including photoelectric detection sensor, signal processing module and data acquisition module, its characterized in that: the signal processing module comprises a double-operational-amplifier compensation adjusting circuit and a differential amplification adjusting circuit, the input end of the double-operational-amplifier compensation adjusting circuit is connected with the signal output end of the photoelectric detection sensor, the output end of the double-operational-amplifier compensation adjusting circuit is connected with the input end of the differential amplification adjusting circuit, the output end of the differential amplification adjusting circuit is connected with the data acquisition module, the data acquisition module comprises an analog/digital (A/D) converter and a microprocessor, and the microprocessor is further connected with a display through a data bus.
2. The photoelectric detection device for ambient air quality monitoring according to claim 1, wherein: the double operational amplifier compensation regulating circuit comprises an operational amplifier AR1 and an operational amplifier AR2, wherein the inverting input end of the operational amplifier AR1 is connected with the signal output end of the photoelectric detection sensor through a resistor R1 and is grounded through a capacitor C1, the non-inverting input end of the operational amplifier AR1 is grounded through a resistor R2 and is connected with the non-inverting input end of the operational amplifier AR1 and the first input end of the differential amplification regulating circuit through a resistor R3; the inverting input end of the operational amplifier AR2 is connected with the inverting input end of the operational amplifier AR1 through a resistor R4, and is connected with the output end of the operational amplifier AR2 and the second input end of the differential amplification regulating circuit through a capacitor C3, and the non-inverting input end of the operational amplifier AR2 is grounded through a capacitor C2.
3. The photoelectric detection device for ambient air quality monitoring according to claim 2, wherein: the differential amplification regulating circuit comprises a triode VT1, a collector of the triode VT1 is connected with a first input end of the differential amplification regulating circuit, a base of the triode VT1 is connected with a second input end of the differential amplification regulating circuit and a cathode of a voltage stabilizing diode DZ1, an anode of the voltage stabilizing diode DZ1 is grounded, an emitter of the triode VT1 is connected with one end of a capacitor C4 and the A/D converter through a rheostat RP1, and the other end of the capacitor C4 is grounded.
4. The photoelectric detection device for ambient air quality monitoring according to claim 3, wherein: the photoelectric detection sensor is a PID-TECH photoionization sensor eVx.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222442206.2U CN218445113U (en) | 2022-09-15 | 2022-09-15 | Photoelectric detection device for monitoring ambient air quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222442206.2U CN218445113U (en) | 2022-09-15 | 2022-09-15 | Photoelectric detection device for monitoring ambient air quality |
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| Publication Number | Publication Date |
|---|---|
| CN218445113U true CN218445113U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222442206.2U Active CN218445113U (en) | 2022-09-15 | 2022-09-15 | Photoelectric detection device for monitoring ambient air quality |
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| Country | Link |
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| CN (1) | CN218445113U (en) |
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2022
- 2022-09-15 CN CN202222442206.2U patent/CN218445113U/en active Active
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