CN102269698A - Device for detecting nitrous oxide based on infrared absorption spectrum - Google Patents
Device for detecting nitrous oxide based on infrared absorption spectrum Download PDFInfo
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- CN102269698A CN102269698A CN 201110184032 CN201110184032A CN102269698A CN 102269698 A CN102269698 A CN 102269698A CN 201110184032 CN201110184032 CN 201110184032 CN 201110184032 A CN201110184032 A CN 201110184032A CN 102269698 A CN102269698 A CN 102269698A
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Abstract
The invention relates to a device for detecting nitrous oxide based on an infrared absorption spectrum, which comprises an infrared laser device, wherein a gas absorption cell filled with gas to be detected is arranged on the infrared-laser-emitting side of the infrared laser device, a photoelectric detector is arranged on the other side of the gas absorption cell, and the signal output end of the photoelectric detector is connected with the signal input end of a microprocessor through an amplifier. When the N2O gas in the gas absorption cell is irradiated by the infrared laser, the N2O gas can selectively absorb photons in a certain frequency, so that the intensity of transmitted light becomes smaller; the photoelectric conversion of output laser signals and the amplification of electric signals are performed through the circuit system, thereby completing the resolution of N2O gas concentration signals; and finally, the microprocessor is used to realize the relevant processing of detection signals and the visualization of data and a graphical interface. The device is simple in equipment, low in cost and convenient to operate, and does not need a gas chromatographic instrument or other large equipment; the result of detection data can be visualized; and professionals are not required for operation.
Description
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Technical field
The present invention relates to the gas concentration detection range, especially a kind of nitrous oxide pick-up unit based on infrared absorption spectrum.
Background technology
In recent years, the environmental problem that greenhouse gas emission brings causes people's attention day by day, six kinds of greenhouse gases of being badly in need of reducing discharging that Kyoto Protocol is pointed out comprise carbon dioxide, methane, nitrous oxide, hydrogen fluorine carbonide, perfluocarbon, sulfur hexafluoride, wherein N
2O comes in third.Although N in the atmosphere
2The content of O seldom, about 0.3～0.4uL/L, but N
2The warming effect of O is extremely obvious, is about CO
2150～200 times, and N
2O is extremely stable in atmosphere, and its mean lifetime reaches 114 years, in recent years the N in the atmosphere
2O concentration increases with annual 0.3% speed, so detect and control effectively N exactly
2The discharging of O is significant.
Present N
2The main detection means of O is a vapor-phase chromatography, promptly uses the chromatography of gas as mobile phase.The shortcoming that vapor-phase chromatography detects is: need main equipments such as gas chromatograph, the cost costliness; Must carry out in the laboratory, can't accomplish on-the-spot the detection; The testing process complexity need be operated by the professional.
Summary of the invention
The object of the present invention is to provide the nitrous oxide pick-up unit that a kind of cost is lower, be convenient to operate, can realize on-the-spot detection based on infrared absorption spectrum.
For achieving the above object, the present invention has adopted following technical scheme: a kind of nitrous oxide pick-up unit based on infrared absorption spectrum, comprise infrared laser, be positioned at the side that infrared laser sends infrared laser the gas absorption cell that inside is filled with gas to be detected is set, the opposite side of gas absorption cell is provided with photodetector, and the signal output part of photodetector links to each other with the signal input part of microprocessor by amplifier.
As shown from the above technical solution, the present invention is according to N
2O gas carries out the character that the infrared radiation selectivity absorbs, the N in gas absorption cell
2When O gas is subjected to infrared laser irradiation that infrared laser sends, N
2O gas-selectively ground absorbs the photon of some frequency, diminishes thereby show as the transmission light intensity; Amplify by opto-electronic conversion, the electric signal of Circuits System again, finish N to the output laser signal
2The parsing of O gas concentration signal; Realize the visual of the relevant treatment of detection signal and data and graphical interfaces by microprocessor at last.Present device is simple, cost is lower, need not main equipments such as gas chromatograph; Easy to operate, it is visual to detect data result, need not professional's operation.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the structural representation of gas absorption cell among the present invention, collimating apparatus and photodetector.
Embodiment
A kind of nitrous oxide pick-up unit based on infrared absorption spectrum, comprise infrared laser 1, the centre wavelength of described infrared laser 1 is 4470nm, be positioned at the side that infrared laser 1 sends infrared laser the gas absorption cell 2 that inside is filled with gas to be detected is set, the infrared laser that infrared laser 1 sends is transferred in the gas absorption cell 2, the opposite side of gas absorption cell 2 is provided with photodetector 3, described photodetector 3 adopts PIN photodiode, and it has good linearity, highly sensitive, response band is wide, response speed is fast, dynamic perfromance is good, advantages such as the stable performance noise is little and cheap.The signal output part of photodetector 3 links to each other by the signal input part of amplifier with microprocessor 4, and the signal output part of described microprocessor 4 links to each other with LCDs, as shown in Figure 1.
Be further described below in conjunction with Fig. 1.
The input end of described infrared laser 1 links to each other with temperature regulation circuit with current stabilization circuit respectively, and temperature regulation circuit and current stabilization circuit guarantee that light source can operate as normal under the situation of external interference, and the laser signal intensity and the centre frequency of output are relatively stable.The signal output part of photodetector 3 links to each other with the input end of photoelectric switching circuit, the output terminal of photoelectric switching circuit links to each other with the input end of pre-amplification circuit, described amplifier is a lock-in amplifier, the output terminal of pre-amplification circuit links to each other with the input end of lock-in amplifier, and the output terminal of lock-in amplifier links to each other with the signal input part of microprocessor 4.The input end of modulation circuit links to each other with sine wave generating circuit with triangle wave generating circuit respectively, the output terminal of modulation circuit links to each other with the input end of infrared laser 1 and lock-in amplifier respectively, the amplitude of sine wave generating circuit modulation infrared laser output light signal, realize that by lock-in amplifier harmonic wave detects, the frequency of triangle wave generating circuit modulation infrared laser output light signal realizes the fine setting of laser center wavelength.
The present invention adopts SR830 two-channel digital lock-in amplifier, the reference signal that its utilizes and measured signal has same frequency and a phase relation is benchmark as a comparison, only the noise component to measured signal itself and those and the same frequency of reference signal or frequency multiplication, homophase has response, therefore, can suppress system noise significantly, improve the signal to noise ratio (S/N ratio) of signal.
Described microprocessor 4 is based on the arm processor exploitation, and arm processor carries AD conversion and memory management unit, can transplant (SuSE) Linux OS and load the AD driver, for gas concentration changing value display process on the operation of equipment interface provides support.The digital signal after nitrous oxide concentration detection application program transforms according to AD and the standardization nitrous oxide concentration curve of foundation are presented at the nitrous oxide concentration value on the LCDs of equipment, read for the user.Use serial ports to change the USB line, the information of equipment is sent on the computer, realize communicating by letter of computer and equipment.
Because the laser signal variation delta I that nitrous oxide absorbs compares extremely faint with the noise in light source output signal and the total system, be that output signal has ultralow signal to noise ratio (S/N ratio), in order effectively useful signal to be extracted and to amplify, the present invention has introduced phase-locked amplifying circuit: at first design pre-amplification circuit, the Signal Pretreatment of photodetector 3 outputs is tentatively amplified; Next designs modulation circuit, and the output of this circuit is divided into two parts, and a part is used for the modulated laser light source makes it the output AC signal, and another part is as the reference signal of lock-in amplifier; The signal that contains noise that pre-amplification circuit is exported is as the input signal of lock-in amplifier at last, and modulation signal is as the reference signal, and lock-in amplifier will extract with the useful signal of reference signal same frequency.
With low frequency sawtooth wave, two signal stacks of high_frequency sine wave conduct excitation, the serrated signal of first low frequency, it comes from the DA output of ARM control; Another is the sinewave modulation signal of high frequency, and it is to be obtained after shaping by ARM output square wave.These two modulation signals all are voltage signals, send into infrared laser 1 modulation signal input end after their additions, thereby realize the Current Control to distributed feedback type semiconductor laser.The sawtooth signal of its medium and low frequency is used for changing the center of infrared laser 1 output wavelength, and the sinusoidal signal of high frequency is used for the modulated laser output amplitude, realizes that the harmonic wave of lock-in amplifier detects.
As shown in Figure 2, described gas absorption cell 2 comprises glass tube 5, and the two ends mouth of pipe of glass tube 5 welds quartz glass plate 6 respectively, offers N on the pipe shaft of glass tube 5 respectively
2Air intake opening 7, gas inlet to be detected 8 and exhausr port 9, N
2Air intake opening 7, gas inlet to be detected 8 and exhausr port 9 can be realized advancing/going out of gas and simple proportioning fast.Glass tube 5 is fixed on the optical table by pillar 10, has reduced because the system noise that mechanical shaking brings.End near infrared laser 1 in the glass tube 5 is provided with collimation lens 11, end near photodetector 3 in the glass tube 5 is provided with collector lens 12, infrared laser 1 links to each other with collimating apparatus 13 by optical fiber 16, collimating apparatus 13 is installed on the optical table by first hold-down support 14, fiber-optical probe is installed on second hold-down support 15, second hold-down support 15 is installed on the optical table, has reduced because the system noise that mechanical shaking brings.Described infrared laser 1, collimating apparatus 13, gas absorption cell 2, collector lens 12 and photodetector 3 are positioned on the same central horizontal axis.Gas absorption cell 2 adopts glass material, and is easy to make, with low cost, and can see the inner case of gas absorption cell 2 in test process, is easy to control.
When detecting, close gas inlet 8 to be detected earlier, open N
2Air intake opening 7 and exhausr port 9, slowly logical high-purity N
2Two minutes, get rid of interference gas in the gas absorption cell; Close N again
2Air intake opening 7 is opened gas inlet 8 to be detected and exhausr port 9, allows be mixed with N
2The sample gas of O gas slowly enters gas absorption cell by gas inlet 8 to be detected after pre-service, be uniformly distributed in air chamber 1 inside, closes air intake opening 2 and gas outlet 4;
Infrared laser 1 powers on, the infrared laser that infrared laser 1 sends becomes directional light and enters gas absorption cell 2 after optical fiber 16 transmission, collimating apparatus 13 are corrected, according to the Lambert-Beer law, because the absorption of the nitrous oxide gas in the gas absorption cell 2, infrared laser intensity weakens; At the other end of gas absorption cell 2, infrared laser arrives photodetectors 3 through collector lens 12, and photodetector 3 changes into electric signal with the variation of light signal and transfers to photoelectric switching circuit;
Can read the N of measurement on the LCDs
2The O gas concentration value; Close gas inlet 8 to be detected, open N
2Air intake opening 7 and exhausr port 9, slowly logical high-purity N
2One minute, guarantee that the air scavenge in the gas absorption cell 2 is clean, close gas inlet 8 to be detected, N at last
2Air intake opening 7 and exhausr port 9 detect and finish.
In a word, the present invention has the following advantages: need not to adopt main equipments such as gas chromatograph, chromatogram station, reduced cost, under situation of making in enormous quantities, cost will further reduce; Added circuit modules such as current stabilization circuit, temperature regulation circuit, laser signal is more stable; Introduced modulation circuit and lock-in amplifier, improved the ability that circuit suppresses noise, realized that the feeble signal of ultralow signal to noise ratio (S/N ratio) is amplified, for the detection of the inferior nitrogen of oxide in trace quantities since provides safeguard; Make full use of proven technique and product in the present optical fiber telecommunications system,, realize online remote measurement by the optical fiber low-loss transmission, and sensing probe part essential safety; Have characteristics such as measurement range is wide, selectivity is good, can the nitrous oxide gas of detectable concentration in 0～100% scope, and do not allow to be subject to the interference of other gases; Have characteristics such as high sensitivity, quick measurement, can quick and precisely reflect the variation of nitrous oxide content, can realize the continuous on-line monitoring of nitrous oxide content.
Claims (6)
1. nitrous oxide pick-up unit based on infrared absorption spectrum, it is characterized in that: comprise infrared laser (1), be positioned at the side that infrared laser (1) sends infrared laser the gas absorption cell (2) that inside is filled with gas to be detected is set, the opposite side of gas absorption cell (2) is provided with photodetector (3), and the signal output part of photodetector (3) links to each other by the signal input part of amplifier with microprocessor (4).
2. the nitrous oxide pick-up unit based on infrared absorption spectrum according to claim 1, it is characterized in that: the input end of described infrared laser (1) links to each other with temperature regulation circuit with current stabilization circuit respectively, the signal output part of photodetector (3) links to each other with the input end of photoelectric switching circuit, the output terminal of photoelectric switching circuit links to each other with the input end of pre-amplification circuit, described amplifier is a lock-in amplifier, the output terminal of pre-amplification circuit links to each other with the input end of lock-in amplifier, the output terminal of lock-in amplifier links to each other with the signal input part of microprocessor (4), the input end of modulation circuit links to each other with sine wave generating circuit with triangle wave generating circuit respectively, and the output terminal of modulation circuit links to each other with the input end of infrared laser (1) and lock-in amplifier respectively.
3. the nitrous oxide pick-up unit based on infrared absorption spectrum according to claim 1 is characterized in that: the signal output part of described microprocessor (4) links to each other with LCDs.
4. the nitrous oxide pick-up unit based on infrared absorption spectrum according to claim 1, it is characterized in that: described gas absorption cell (2) comprises glass tube (5), the two ends mouth of pipe of glass tube (5) welds quartz glass plate (6) respectively, offers N respectively on the pipe shaft of glass tube (5)
2Air intake opening (7), gas inlet to be detected (8) and exhausr port (9), glass tube (5) is fixed on the optical table by pillar (10), end near infrared laser (1) in the glass tube (5) is provided with collimation lens (11), end near photodetector (3) in the glass tube (5) is provided with collector lens (12), infrared laser (1) links to each other with collimating apparatus (13) by optical fiber (16), collimating apparatus (13) is installed on the optical table by first hold-down support (14), fiber-optical probe is installed on second hold-down support (15), and second hold-down support (15) is installed on the optical table.
5. the nitrous oxide pick-up unit based on infrared absorption spectrum according to claim 2 is characterized in that: described photodetector (3) adopts PIN photodiode, and the centre wavelength of described infrared laser (1) is 4470nm.
6. the nitrous oxide pick-up unit based on infrared absorption spectrum according to claim 4 is characterized in that: described infrared laser (1), collimating apparatus (13), gas absorption cell (2), collector lens (12) and photodetector (3) are positioned on the same central horizontal axis.
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| CN 201110184032 CN102269698A (en) | 2011-07-04 | 2011-07-04 | Device for detecting nitrous oxide based on infrared absorption spectrum |
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| CN 201110184032 CN102269698A (en) | 2011-07-04 | 2011-07-04 | Device for detecting nitrous oxide based on infrared absorption spectrum |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103543119A (en) * | 2012-07-12 | 2014-01-29 | 成都科盛石油科技有限公司 | Petroleum logging carbon dioxide detector capable of performing real-time communication |
| CN103743694A (en) * | 2013-12-31 | 2014-04-23 | 杭州泰林生物技术设备有限公司 | Non-dispersed infrared gas detector |
| CN104390937A (en) * | 2014-11-24 | 2015-03-04 | 中国科学院合肥物质科学研究院 | Trace nitrous oxide gas detection device |
| CN105403530A (en) * | 2015-10-26 | 2016-03-16 | 长沙开元仪器股份有限公司 | Gas concentration detection apparatus and method thereof |
| CN106053376A (en) * | 2016-08-16 | 2016-10-26 | 北京千安哲信息技术有限公司 | Gas pollutant detection device |
| CN107533000A (en) * | 2015-03-31 | 2018-01-02 | 日本电信电话株式会社 | N2O analytical equipments and analysis method |
| CN108627429A (en) * | 2018-07-31 | 2018-10-09 | 郑州智谷工业技术有限公司 | A kind of nitrous oxide monitoring device and its monitoring method |
| CN108956517A (en) * | 2018-09-11 | 2018-12-07 | 哈尔滨工业大学 | A kind of real-time online continuously monitors the device and its application method of sulfate concentration |
| CN110160977A (en) * | 2019-06-17 | 2019-08-23 | 浙江三青环保科技有限公司 | A kind of full spectral water quality on-Line Monitor Device |
| CN111982858A (en) * | 2020-07-27 | 2020-11-24 | 浙江欧文光谱科技有限公司 | Three kinds of easy-to-addiction gas medicine detector |
| CN115855871A (en) * | 2022-12-09 | 2023-03-28 | 重庆大学 | Nitrous oxide monitoring devices based on solid raman laser |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543119A (en) * | 2012-07-12 | 2014-01-29 | 成都科盛石油科技有限公司 | Petroleum logging carbon dioxide detector capable of performing real-time communication |
| CN103743694A (en) * | 2013-12-31 | 2014-04-23 | 杭州泰林生物技术设备有限公司 | Non-dispersed infrared gas detector |
| CN104390937A (en) * | 2014-11-24 | 2015-03-04 | 中国科学院合肥物质科学研究院 | Trace nitrous oxide gas detection device |
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| CN107533000A (en) * | 2015-03-31 | 2018-01-02 | 日本电信电话株式会社 | N2O analytical equipments and analysis method |
| CN107533000B (en) * | 2015-03-31 | 2020-05-22 | 日本电信电话株式会社 | N2O analysis device and analysis method |
| CN105403530A (en) * | 2015-10-26 | 2016-03-16 | 长沙开元仪器股份有限公司 | Gas concentration detection apparatus and method thereof |
| CN106053376A (en) * | 2016-08-16 | 2016-10-26 | 北京千安哲信息技术有限公司 | Gas pollutant detection device |
| CN108627429A (en) * | 2018-07-31 | 2018-10-09 | 郑州智谷工业技术有限公司 | A kind of nitrous oxide monitoring device and its monitoring method |
| CN108627429B (en) * | 2018-07-31 | 2021-12-31 | 白宇轩 | Nitrous oxide monitoring device and monitoring method thereof |
| CN108956517A (en) * | 2018-09-11 | 2018-12-07 | 哈尔滨工业大学 | A kind of real-time online continuously monitors the device and its application method of sulfate concentration |
| CN110160977A (en) * | 2019-06-17 | 2019-08-23 | 浙江三青环保科技有限公司 | A kind of full spectral water quality on-Line Monitor Device |
| CN110160977B (en) * | 2019-06-17 | 2020-02-21 | 浙江三青环保科技有限公司 | Full-spectrum water quality online monitoring device |
| CN111982858A (en) * | 2020-07-27 | 2020-11-24 | 浙江欧文光谱科技有限公司 | Three kinds of easy-to-addiction gas medicine detector |
| CN115855871A (en) * | 2022-12-09 | 2023-03-28 | 重庆大学 | Nitrous oxide monitoring devices based on solid raman laser |
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Inventor after: Zheng Shouguo Inventor after: Li Miao Inventor after: Shi Huaiwen Inventor after: Zeng Xinhua Inventor after: Zhang Jian Inventor after: Liang Fangli Inventor after: Hu Zelin Inventor after: Ren Yugang Inventor after: Zhu Zede Inventor before: Zheng Shouguo Inventor before: Li Miao Inventor before: Shi Huaiwen Inventor before: Zeng Xinhua Inventor before: Zhang Jian Inventor before: Hu Zelin Inventor before: Ren Yugang Inventor before: Zhu Zede |
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Free format text: CORRECT: INVENTOR; FROM: ZHENG SHOUGUO LI MIAO SHI HUAIWEN CENG XINHUA ZHANG JIAN HU ZELIN REN YUGANG ZHU ZEDE TO: ZHENG SHOUGUO LI MIAO SHI HUAIWEN CENG XINHUA ZHANG JIAN LIANG FANGLI HU ZELIN REN YUGANG ZHU ZEDE |
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Application publication date: 20111207 |