CN103674797A - Sensor for particulate matter concentration detection - Google Patents
Sensor for particulate matter concentration detection Download PDFInfo
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- CN103674797A CN103674797A CN201310727374.9A CN201310727374A CN103674797A CN 103674797 A CN103674797 A CN 103674797A CN 201310727374 A CN201310727374 A CN 201310727374A CN 103674797 A CN103674797 A CN 103674797A
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Abstract
The invention discloses a sensor for particulate matter concentration detection. The sensor comprises a semiconductor laser unit, an avalanche photodiode and an optoelectronic signal conditioning circuit, wherein the avalanche photodiode is connected with the optoelectronic signal conditioning circuit to form a detection channel between the semiconductor laser unit and the avalanche photodiode. The sensor is simple in structure and low in cost, has the advantages of precision in measurement, quickness in response, small error, high sensitivity, and good stability, can detect the concentration of PM 2.5 precisely, and effectively improves the detecting precision.
Description
Technical field
The present invention relates to the sensor that Atmospheric Grains concentration detects, particularly a kind of photoelectric sensor that detects PM2.5.
Background technology
At present, photoelectric sensor has been applied to the detection of PM2.5, the selected light-source brightness of common photoelectric sensor is lower, photovalve sensitivity is also lower, fine nature due to PM2.5, make the light intensity that modulate circuit detects change small, affected photoelectric conversion process, so PM2.5 accuracy of detection is not high.
Summary of the invention
The object of the invention is to provide a kind of particle concentration detecting sensor, to improve the accuracy of detection of PM2.5.
According to an aspect of the present invention, particle concentration detecting sensor is provided, comprise semiconductor laser, avalanche photodide and photosignal modulate circuit, avalanche photodide is connected with photosignal modulate circuit, makes to form sense channel between semiconductor laser and avalanche photodide.
Its beneficial effect is: owing to forming sense channel between semiconductor laser and avalanche photodide, thereby semiconductor laser, avalanche photodide and photosignal modulate circuit have formed correlation type photoelectric sensor, use high brightness, highly sensitive, the semiconductor laser of good stability is as transmitter, use has interior gain, the good avalanche photodide of sensitivity is as receiver, stability in use is good, error little photosignal modulate circuit as testing circuit, therefore can realize the accurate detection of PM2.5, also improved the accuracy of detection of PM2.5.
In some embodiments, photosignal modulate circuit, comprising:
I/V change-over circuit, is converted to voltage signal output for the current signal that avalanche photodide opto-electronic conversion is produced;
Voltage amplifier circuit, for amplifying output by described voltage signal;
Voltage follower circuit, for carrying out voltage stabilizing output by the described voltage signal amplifying;
Negative voltage transition device, is connected with power supply, the conversion of arrive-5V power supply of realization+5V.
Its beneficial effect is: the current signal of avalanche photodide opto-electronic conversion being exported due to I/V change-over circuit is converted to Voltage-output, by voltage amplifier circuit, output voltage is amplified to processing again, through the output voltage amplifying after processing, by voltage follower circuit, realize buffering, isolation, impedance transformation and improve load capacity, obtain stable output voltage, therefore can realize the reliability and stability of photosignal modulate circuit.
In some embodiments, between semiconductor laser and avalanche photodide, be provided with successively the first convex lens, the second convex lens and the 3rd convex lens, the first convex lens are near semiconductor laser, and the second convex lens, the 3rd convex lens lay respectively at the both sides of sense channel.
Its beneficial effect is: the illumination of semiconductor laser light source being sent due to the first convex lens, the second convex lens is mapped to light sensitive area, secondary at the first convex lens, the second convex lens converges under effect, through sense channel, by the 3rd convex lens, light is collected and sends to avalanche photodide, therefore can realize the collecting action of light, effectively avoid the waste of light.
In some embodiments, sensor seals by black aluminum pipe.
Its beneficial effect is: due to black aluminum pipe sealing for whole sensor, avoided light sensitive area veiling glare in addition to enter light sensitive area, therefore can realize the light pulse signal of collecting reliable and stable, the performance of sensor is improved, increase output signal-to-noise ratio, improved transducer sensitivity.
Beneficial effect of the present invention is: simple in structure, cost is low, have advantages of measure accurately, reaction is fast, error is little, highly sensitive, good stability, can accurately detect PM2.5 concentration, has effectively improved accuracy of detection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the particle concentration detecting sensor of one embodiment of the present invention;
Fig. 2 is the circuit diagram of photosignal modulate circuit in particle concentration detecting sensor shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Fig. 1 has schematically shown the particle concentration detecting sensor according to one embodiment of the present invention.
As shown in Figure 1, this particle concentration detecting sensor comprises semiconductor laser 1, avalanche photodide 2 and photosignal modulate circuit 3, avalanche photodide 2 is connected with photosignal modulate circuit 3, makes to form sense channel 4 between semiconductor laser 1 and avalanche photodide 2.
Between semiconductor laser 1 and avalanche photodide 2, be provided with from left to right the first convex lens 5, the second convex lens 6 and the 3rd convex lens 7, the first convex lens 5 and the second convex lens 6 are positioned at a side of sense channel 4, and the 3rd convex lens 7 are positioned at the opposite side of sense channel 4.
As shown in Figure 1, the path that in figure, the direction of arrow has indicated light to irradiate.Light source adopts operating voltage 4.5V～5V, wavelength 650nm, and the semiconductor laser of power 10mW, its brightness is high, good stability.Optical detection device adopts the Si avalanche photodide of AD500-8-TO52-S1, its junction capacity is little, highly sensitive, response is fast, the variation of energy rapid reaction particle concentration, on 650nm wavelength, there is higher responsiveness, and optimum gain is 60, amplifying circuit without high-gain just can obtain desired result, has reduced noise and has reduced circuit instability.
As shown in Figure 2, photosignal modulate circuit 3 comprises I/V change-over circuit 9, voltage amplifier circuit 10, voltage follower circuit 11 and negative voltage transition device 12.
The light beam of semiconductor laser 1 transmitting is received by avalanche photodide 2, through opto-electronic conversion generation current i, and input I/V change-over circuit 9, I/V change-over circuit 9 employing resistance R 1 and electrochemical capacitor C1 respectively formed weak signal generator in parallel with avalanche photodide 2 carry out I/V conversion, thereby make current i be converted to voltage V by resistance R 1
iN, i.e. V
iN=i*R1.
Voltage V
iNinput voltage amplifying circuit 10 amplifies, and voltage amplifier circuit 10 adopts operational amplifier U1, and U1 can select AD8610, due to V
iNdetection signal smaller, by AD8610 in-phase amplification circuit, amplify so that the data acquisition of rear class, and regulating resistance R3 changes gain, and meets formula:
In voltage amplifier circuit 10, C2, C3 play the filter action of input power.
Voltage V
iNoutput voltage V after amplifying
oUT1, and following by inputting voltages circuit 11, voltage follower circuit 11 adopts operational amplifier U2, and U2 can select TL072, and TL072 comprises two amplifiers, and the parameter of these two amplifiers is consistent, input voltage deviation and bias current all equate, when R4=R5,
V
OUT1＝V
OUT
Thereby by impedance transformation, obtain stable output voltage V
oUT, for the signal of rear class, process Reliable guarantee be provided.In voltage follower circuit 11, capacitor C 4 can be avoided high-frequency self-excitation vibration, and C5, C6 play the filter action of input power.
Negative voltage transition device 12 adopts reversal of poles power supply changeover device U3, U3 can select ICL7660, the stability of power supply and the voltage balance of positive-negative power directly affect amplifier performance, utilize the conversion of arrive-5V power supply of ICL7660 chip realization+5V, thereby reduce the impact on photosignal modulate circuit 3.
Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (4)
1. particle concentration detecting sensor, it is characterized in that, comprise semiconductor laser, avalanche photodide and photosignal modulate circuit, described avalanche photodide is connected with described photosignal modulate circuit, makes to form sense channel between described semiconductor laser and described avalanche photodide.
2. sensor according to claim 1, is characterized in that,
Described photosignal modulate circuit, comprising:
I/V change-over circuit, is converted to voltage signal output for the current signal that avalanche photodide opto-electronic conversion is produced;
Voltage amplifier circuit, for amplifying output by described voltage signal;
Voltage follower circuit, for carrying out voltage stabilizing output by the described voltage signal amplifying;
Negative voltage transition device, is connected with power supply, the conversion of arrive-5V power supply of realization+5V.
3. sensor according to claim 1, it is characterized in that, between described semiconductor laser and avalanche photodide, be provided with successively the first convex lens, the second convex lens and the 3rd convex lens, described the first convex lens are near semiconductor laser, and described the second convex lens, the 3rd convex lens lay respectively at the both sides of sense channel.
4. sensor according to claim 1, is characterized in that, described sensor seals by black aluminum pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310727374.9A CN103674797A (en) | 2013-12-25 | 2013-12-25 | Sensor for particulate matter concentration detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310727374.9A CN103674797A (en) | 2013-12-25 | 2013-12-25 | Sensor for particulate matter concentration detection |
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| CN103674797A true CN103674797A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310727374.9A Pending CN103674797A (en) | 2013-12-25 | 2013-12-25 | Sensor for particulate matter concentration detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833621A (en) * | 2015-04-27 | 2015-08-12 | 江苏大学 | Medical atomizer salt fog concentration detection sensor and detection method |
| CN104849238A (en) * | 2015-06-10 | 2015-08-19 | 浙江诸暨奇创电子科技有限公司 | Infrared turbidity detection device |
| CN111044862A (en) * | 2019-12-23 | 2020-04-21 | 南通大学 | Device for testing volume of gas capable of penetrating through fabric under action of simulated arc deflagration shock wave |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580535Y (en) * | 2002-11-13 | 2003-10-15 | 北京安控科技发展有限公司 | Voltage signal modulation circuit |
| CN2754061Y (en) * | 2004-12-23 | 2006-01-25 | 苏州科技学院现代电子技术研究所 | Portable high-flow laser dust measuring instrument optical sensor |
| CN2935133Y (en) * | 2006-06-09 | 2007-08-15 | 深圳市赛纳威环境仪器有限公司 | Optical sensor |
| CN202033282U (en) * | 2011-04-20 | 2011-11-09 | 北京汇丰隆经济技术开发有限公司 | Optical path system used for portable bioaerosol single particle detection instrument |
-
2013
- 2013-12-25 CN CN201310727374.9A patent/CN103674797A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580535Y (en) * | 2002-11-13 | 2003-10-15 | 北京安控科技发展有限公司 | Voltage signal modulation circuit |
| CN2754061Y (en) * | 2004-12-23 | 2006-01-25 | 苏州科技学院现代电子技术研究所 | Portable high-flow laser dust measuring instrument optical sensor |
| CN2935133Y (en) * | 2006-06-09 | 2007-08-15 | 深圳市赛纳威环境仪器有限公司 | Optical sensor |
| CN202033282U (en) * | 2011-04-20 | 2011-11-09 | 北京汇丰隆经济技术开发有限公司 | Optical path system used for portable bioaerosol single particle detection instrument |
Non-Patent Citations (1)
| Title |
|---|
| 赵亮等: "微弱信号调理电路的设计及研究", 《西南科技大学学报》, vol. 31, no. 15, 31 December 2012 (2012-12-31) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833621A (en) * | 2015-04-27 | 2015-08-12 | 江苏大学 | Medical atomizer salt fog concentration detection sensor and detection method |
| CN104833621B (en) * | 2015-04-27 | 2018-04-03 | 江苏大学 | A kind of vaporizer concentration of saline fog detection sensor and detection method |
| CN104849238A (en) * | 2015-06-10 | 2015-08-19 | 浙江诸暨奇创电子科技有限公司 | Infrared turbidity detection device |
| CN104849238B (en) * | 2015-06-10 | 2017-10-03 | 浙江诸暨奇创电子科技有限公司 | A kind of infrared turbidity detection device |
| CN111044862A (en) * | 2019-12-23 | 2020-04-21 | 南通大学 | Device for testing volume of gas capable of penetrating through fabric under action of simulated arc deflagration shock wave |
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Inventor after: Yang Yongjie Inventor after: Shen Hongming Inventor after: Xu Peng Inventor after: Yang Saicheng Inventor after: Zhang Yusheng Inventor after: Yang Beiping Inventor after: Chen Pei Inventor before: Yang Yongjie Inventor before: Shen Hongmin Inventor before: Xu Peng Inventor before: Yang Saicheng Inventor before: Zhang Yusheng Inventor before: Yang Beiping Inventor before: Chen Pei |
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Free format text: CORRECT: INVENTOR; FROM: YANG YONGJIE SHEN HONGMIN XU PENG YANG SAICHENG ZHANG YUSHENG YANG BEIPING CHEN PEI TO: YANG YONGJIE SHEN HONGMING XU PENG YANG SAICHENG ZHANG YUSHENG YANG BEIPING CHEN PEI |
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Application publication date: 20140326 |