CN105388125A - Optical detection system for carbon monoxide concentration - Google Patents
Optical detection system for carbon monoxide concentration Download PDFInfo
- Publication number
- CN105388125A CN105388125A CN201510724393.5A CN201510724393A CN105388125A CN 105388125 A CN105388125 A CN 105388125A CN 201510724393 A CN201510724393 A CN 201510724393A CN 105388125 A CN105388125 A CN 105388125A
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- CN
- China
- Prior art keywords
- air chamber
- systems
- optical inspection
- carbonomonoxide concentration
- amplifier
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
Abstract
The invention discloses an optical detection system for the carbon monoxide concentration. The optical detection system comprises a tunable DFBLD, a coupler, a reference air chamber, a detection air chamber, photoelectric detectors, pre-amplifiers, a differential signal device, a lock-phase amplifier and a signal processor; the tunable DFBLD is connected with the coupler, the coupler is connected with the reference air chamber and the detection air chamber, the reference air chamber and the detection air chamber are each connected with one photoelectric detector, and each photoelectric detector is connected with one pre-amplifier and then connected into the same differential signal device and enters the signal processor after being amplified by the lock-phase amplifier. According to the optical detection system for the carbon monoxide concentration, errors are small, the test precision of the system is improved, and the wider detection limit is achieved.
Description
Technical field
The present invention relates to a kind of Systems for optical inspection of carbonomonoxide concentration, belong to optoelectronic information technical field.
Background technology
The optical detective technology major part of carbonomonoxide concentration conventional is at present theoretical based on the absorption spectrum of gas analysis, namely utilizes the principle of the absorption of the light space gas molecule of specific wavelength to detect the concentration of gas.Because the live width of the molecular spectrum of gas is very narrow, spectrum width is generally nanometer scale, and absorbed power is small compared with outside noise, directly by detect light intensity weak come measure gas concentrations be very difficult.
Tunable diode laser absorption spectroscopy technology (TDLAS) is the wavelength tuning scan characteristic utilizing laser instrument, obtains the absorption spectrum in tested gas characteristic absorption spectrum ranges, thus realizes the qualitative of CO gas or quantitative test.The principle of this technology is that the optical maser wavelength by regulating size of current to control is aimed at a certain absorption peak of tested gas.By sinusoidal signal, optical maser wavelength to be modulated. the laser after modulation is by tested gas. due to the absorption effect of gas. wavelength-modulated is converted to intensity modulated. when laser center wavelength aims at the center at gas absorption peak. export the second harmonic signal that light includes modulating frequency. now signal amplitude is proportional to the concentration of gas.By extracting the second harmonic of absorption signal. the measurement of gas concentration can be realized.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of Systems for optical inspection of carbonomonoxide concentration.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
The Systems for optical inspection of carbonomonoxide concentration, comprising: tunable DFBLD(distributed feedback laser diode), coupling mechanism, reference gas chamber, detection air chamber, photodetector, prime amplifier, differential signal device, lock-in amplifier, signal processor; Tunable DFBLD butt coupling device, coupling mechanism simultaneously with reference gas chamber, detect air chamber and be connected respectively, reference gas chamber, detection air chamber respectively connect a photodetector, each photodetector connects a prime amplifier respectively, then access same differential signal device, be then amplified into signal processor through lock-in amplifier.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described signal processor comprises photoelectric switching circuit and level shifting circuit.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described coupling mechanism is photoelectrical coupler.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described photo-detector adopts PIN photodiode.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described photo-detector adopts avalanche type APD photodiode.
Beneficial effect: the Systems for optical inspection of carbonomonoxide concentration provided by the invention, TDLAS is adopted to measure the CO that concentration range is 1-9%, the measurement result of Second Harmonic Method and the error of calibration value is utilized to be less than 3%, the resolution measuring CO concentration can reach 0.0001%, improve system testing precision, there is wider detectability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, the Systems for optical inspection of carbonomonoxide concentration, comprising: tunable DFBLD(distributed feedback laser diode), coupling mechanism, reference gas chamber, detection air chamber, photodetector, prime amplifier, differential signal device, lock-in amplifier, signal processor; Tunable DFBLD butt coupling device, coupling mechanism simultaneously with reference gas chamber, detect air chamber and be connected respectively, reference gas chamber, detection air chamber respectively connect a photodetector, each photodetector connects a prime amplifier respectively, then access same differential signal device, be then amplified into signal processor through lock-in amplifier.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described signal processor comprises photoelectric switching circuit and level shifting circuit.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described coupling mechanism is photoelectrical coupler.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described photo-detector adopts PIN photodiode.
The Systems for optical inspection of described carbonomonoxide concentration, is characterized in that: described photo-detector adopts avalanche type APD photodiode.
The Systems for optical inspection of carbonomonoxide concentration provided by the invention, TDLAS is adopted to measure the CO that concentration range is 1-9%, the measurement result of Second Harmonic Method and the error of calibration value is utilized to be less than 3%, the resolution measuring CO concentration can reach 0.0001%, improve system testing precision, there is wider detectability.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. the Systems for optical inspection of carbonomonoxide concentration, comprising: tunable DFBLD, coupling mechanism, reference gas chamber, detection air chamber, photodetector, prime amplifier, differential signal device, lock-in amplifier, signal processor; Tunable DFBLD butt coupling device, coupling mechanism simultaneously with reference gas chamber, detect air chamber and be connected respectively, reference gas chamber, detection air chamber respectively connect a photodetector, each photodetector connects a prime amplifier respectively, then access same differential signal device, be then amplified into signal processor through lock-in amplifier.
2. the Systems for optical inspection of carbonomonoxide concentration according to claim 1, is characterized in that: described signal processor comprises photoelectric switching circuit and level shifting circuit.
3. the Systems for optical inspection of carbonomonoxide concentration according to claim 1, is characterized in that: described coupling mechanism is photoelectrical coupler.
4. the Systems for optical inspection of carbonomonoxide concentration according to claim 1, is characterized in that: described photo-detector adopts PIN photodiode.
5. the Systems for optical inspection of carbonomonoxide concentration according to claim 1, is characterized in that: described photo-detector adopts avalanche type APD photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510724393.5A CN105388125A (en) | 2015-10-30 | 2015-10-30 | Optical detection system for carbon monoxide concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510724393.5A CN105388125A (en) | 2015-10-30 | 2015-10-30 | Optical detection system for carbon monoxide concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105388125A true CN105388125A (en) | 2016-03-09 |
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| CN201510724393.5A Pending CN105388125A (en) | 2015-10-30 | 2015-10-30 | Optical detection system for carbon monoxide concentration |
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| CN (1) | CN105388125A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891115A (en) * | 2016-06-02 | 2016-08-24 | 盐城工学院 | Flue gas component monitoring device and method based on ZigBee |
| CN106053362A (en) * | 2016-05-23 | 2016-10-26 | 北京赛科希德科技股份有限公司 | Absorbance detection system and method |
| CN106908413A (en) * | 2017-05-05 | 2017-06-30 | 江苏三恒科技股份有限公司 | Laser methane monochromatic light road harmonic measurement device and method based on FPGA |
| CN110160990A (en) * | 2019-05-30 | 2019-08-23 | 深圳华领气体技术有限公司 | Trace gas and its isotope real time on-line detection device |
| CN110261349A (en) * | 2019-07-04 | 2019-09-20 | 哈尔滨工程大学 | Gas concentration measuring method and device based on TDLAS |
| CN110320178A (en) * | 2019-07-17 | 2019-10-11 | 电子科技大学 | A kind of gas detecting system and its detection method based on wavelength modulation spectrum technology |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101308090A (en) * | 2008-06-09 | 2008-11-19 | 中国科学技术大学 | Fire field multi- parameter optical maser wavelength modulated spectrum detector method and apparatus |
| CN101504367A (en) * | 2009-03-10 | 2009-08-12 | 哈尔滨工业大学 | Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide |
| CN100559160C (en) * | 2003-09-12 | 2009-11-11 | Ir微系统股份有限公司 | Gas detection method and gas detector device |
| CN102478510A (en) * | 2010-11-24 | 2012-05-30 | 上海复莱信息技术有限公司 | Spectrum-type sensor for methane detection |
| CN103499545A (en) * | 2013-10-14 | 2014-01-08 | 北京信息科技大学 | Semiconductor laser gas detection system with function of gas reference cavity feedback compensation |
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2015
- 2015-10-30 CN CN201510724393.5A patent/CN105388125A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100559160C (en) * | 2003-09-12 | 2009-11-11 | Ir微系统股份有限公司 | Gas detection method and gas detector device |
| CN101308090A (en) * | 2008-06-09 | 2008-11-19 | 中国科学技术大学 | Fire field multi- parameter optical maser wavelength modulated spectrum detector method and apparatus |
| CN101504367A (en) * | 2009-03-10 | 2009-08-12 | 哈尔滨工业大学 | Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide |
| CN102478510A (en) * | 2010-11-24 | 2012-05-30 | 上海复莱信息技术有限公司 | Spectrum-type sensor for methane detection |
| CN103499545A (en) * | 2013-10-14 | 2014-01-08 | 北京信息科技大学 | Semiconductor laser gas detection system with function of gas reference cavity feedback compensation |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053362A (en) * | 2016-05-23 | 2016-10-26 | 北京赛科希德科技股份有限公司 | Absorbance detection system and method |
| CN106053362B (en) * | 2016-05-23 | 2022-05-31 | 北京赛科希德科技股份有限公司 | Absorbance detection system and method |
| CN105891115A (en) * | 2016-06-02 | 2016-08-24 | 盐城工学院 | Flue gas component monitoring device and method based on ZigBee |
| CN106908413A (en) * | 2017-05-05 | 2017-06-30 | 江苏三恒科技股份有限公司 | Laser methane monochromatic light road harmonic measurement device and method based on FPGA |
| CN110160990A (en) * | 2019-05-30 | 2019-08-23 | 深圳华领气体技术有限公司 | Trace gas and its isotope real time on-line detection device |
| CN110261349A (en) * | 2019-07-04 | 2019-09-20 | 哈尔滨工程大学 | Gas concentration measuring method and device based on TDLAS |
| CN110320178A (en) * | 2019-07-17 | 2019-10-11 | 电子科技大学 | A kind of gas detecting system and its detection method based on wavelength modulation spectrum technology |
| CN110320178B (en) * | 2019-07-17 | 2021-12-10 | 电子科技大学 | Gas detection system based on wavelength modulation spectrum technology and detection method thereof |
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Application publication date: 20160309 |