CN102654455A - Laser gas analyzer for multicomponent multiplexing measurement - Google Patents
Laser gas analyzer for multicomponent multiplexing measurement Download PDFInfo
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- CN102654455A CN102654455A CN2012101060867A CN201210106086A CN102654455A CN 102654455 A CN102654455 A CN 102654455A CN 2012101060867 A CN2012101060867 A CN 2012101060867A CN 201210106086 A CN201210106086 A CN 201210106086A CN 102654455 A CN102654455 A CN 102654455A
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Abstract
The invention discloses a laser gas analyzer for multicomponent multiplexing measurement, comprising a laser driving control circuit, three packaged lasers, an optical fiber beam combiner, a collimating lens, an optical receiving module and a signal processing and display module, wherein the laser driving control circuit modulates and drives the three packaged lasers to emit different laser light rays needing to be modulated in wavelength; the laser light emitted by each packaged laser is transmitted through a single-mode optical fiber; the single-mode optical fibers are combined into an optical fiber beam through the optical fiber beam combiner; the laser light is emitted from the tail part of the optical fiber beam, and enters into the optical receiving module for collection and light-splitting detection after collimation in the collimating lens; and a signal obtained after light-splitting detection is transmitted to the signal processing and display module for processing so that real-time concentrations of a plurality of gases needing to be detected can be obtained. According to the invention, multiplexing detection is carried out on the laser lights with various wavelengths in an optical fiber beam mode; and such a method is capable of effectively avoiding optical noise aroused by the processing of a wavelength division multiplexing device, improving the accuracy of the analyzer measuring concentrations and reducing the cost.
Description
Technical field
The present invention relates to a kind of laser gas analyzer, relate in particular to the laser gas analyzer of the multiplexing measurement of a kind of polycomponent.
Background technology
The semiconductor laser gas analyser is the gas controlling device of a kind of " in real time ", " online ", is usually used in fields such as petrochemical industry, iron and steel, cement, environmental protection, industrial on-line monitoring.Laser gas analyzer is a kind of highly sensitive gas analysis means, and its principle is after the laser of specific wavelength passes through gas, because of receiving the absorption at gas specific absorption peak, to produce the decay of light intensity.The available Beer-Lambert law of the decay of light intensity accurate description:
Wherein
is respectively after laser passes through gas; Through the light intensity before the gas; V is the frequency of laser; P, X and L are respectively pressure, concentration and the light paths of gas.The strong S of line (T) is the function of temperature T, the shape of linear function
expression absorption line.Can know that by the Beer-Lambert law decay of light intensity and the concentration of tested gas are directly proportional, thereby can obtain the concentration of tested gas through the decay of Laser Measurement after through gas.Simultaneously,, do not receive the interference of other gases, have very high measurement sensitivity because the emission peak very narrow (less than 15MHz) of Distributed Feedback Laser can select single gas absorption spectrum line to measure during work.
With respect to traditional some touch sensor (like zirconia etc.), laser gas analyzer can detect the gas concentration to be measured on the light path because " original position " formula of employing is measured, so can the on-the-spot gas concentration of more real response measurement.Special in the bigger environment of some measurement volumes, like the process gas measurement in the large-sized boiler etc., laser gas analyzer is " accurately " more, the concentration of the course of reaction gas of " in real time " more, and maintenance simultaneously has very big application advantage less.
The process gas concentration of various ingredients possibly measured simultaneously in a plurality of positions in the commercial production field.Like the accurate measure CO of needs in the large-scale burning boiler, CO2, various features gas concentrations such as O2 could be optimized control to burning efficiency.Simultaneously, because the large-sized boiler volume is bigger, single sensing point can not effectively reflect the boiler overall density, so also need measure the various features gas concentration at a plurality of measurement points.But every instrument of common laser gas analyzer can only be measured a kind of concentration of characteristic gas, if the concentration of a plurality of at the scene position measurement various features gases will be arranged many analysers, the on-the-spot installation can be very complicated, chaotic.Even so many welding flange perforate can't be provided in some positions, can't carry out the measurement of characteristic gas concentration.Addressing this is that the best way is that the various wavelength lasers of measuring multiple gases are multiplexed on same the light path, only can obtain the concentration of various features gas through a pair of welding flange.
Summary of the invention
The object of the invention is exactly in order to overcome the defective of prior art, and the laser gas analyzer of the minimum multiplexing measurement of polycomponent of a kind of simple in structure, handling ease, introducing optical noise possibility is provided.
The present invention realizes through following technical scheme:
The laser gas analyzer of the multiplexing measurement of a kind of polycomponent; Include Laser Drive control circuit, three encapsulated laser, optical-fiber bundling device, collimation lens, Optical Receivers and signal Processing and display module; First encapsulated laser is measured concentration of oxygen; Second and the 3rd encapsulated laser measured carbon monoxide and concentration of carbon dioxide respectively; The modulation of described Laser Drive control circuit, drive described three encapsulated laser and send different wavelength of laser, wherein the optical maser wavelength sent of first encapsulated laser is 0.7 μ m, and second and the 3rd optical maser wavelength that encapsulated laser is sent is 1.5 μ m; Be connected to a single-mode fiber on the tail optical fiber of three encapsulated laser respectively; Three single-mode fibers synthesize fibre bundle through behind the described optical-fiber bundling devices, and laser penetrates and incides on the described collimation lens from the afterbody of fibre bundle, pass gas to be measured through the laser behind the collimation and get into described Optical Receivers and collect light, divide photodetection; To pass through optical signal transmission after the branch photodetection to described signal Processing and display module; Signal Processing and display module average, after the filtering, nonlinear fitting algorithm process, obtain the concentration of three kinds of gases, and respectively concentration value is shown light signal.
Characteristic of the present invention also is: the cutoff wavelength of described single-mode fiber guarantees that greater than wavelength maximum in the various laser various laser transmit maintenance single mode, the optical noise of having avoided the optical fiber multimode to cause in single-mode fiber; Described Optical Receivers transfers signals to signal Processing and display module through cable; Described minute photodetection concrete grammar is time division multiplex or wavelength-division multiplex method; Used large diameter condenser lens to collect laser in the described Optical Receivers; With compensation because each the optical fiber luminous position collimation emission angle that causes problem of difference to some extent that differs in the fibre bundle; Software simulation result as shown in Figure 2 can know the influence of adopting the emission angle difference that large diameter condenser lens fully can the compensated optical fiber band comes; Can according to the difference of the gas that will measure, make encapsulated laser send with the laser of the corresponding wavelength of gas that will measure; According to what of the gaseous species that will measure, can increase or reduce the quantity of encapsulated laser, reach the purpose of measurement multiple gases concentration.
The present invention measures the encapsulated laser of various process gas concentration through the modulation of Laser Drive control circuit, driving; Obtain the laser output of required modulation; The laser of encapsulated laser output transmits through single-mode fiber; Adopt three encapsulated laser to measure oxygen, carbon monoxide and concentration of carbon dioxide respectively among Fig. 1, its wavelength coverage be 0.7 μ m to 1.5 μ m, the mode that adopts wavelength-division multiplex to close bundle is difficult in so wide bandwidth interior focusing and well closes bundle by force; On the other hand, laser gas analyzer is usually used in measuring trace gas concentration, and its resolution need reach 10
-5-10
-6, adopt wavelength-division multiplex technique that optical fiber is melted and draw the optical noise that is easy to introduce optical fiber, reduce the performance of laser gas analyzer.The present invention adopts the way of fibre bundle that various laser are multiplexed into same light path, behind the collimation lens collimation, injects scene to be measured and carries out gas concentration measurement.The laser intensity of each wavelength is measured through reception, beam splitting system through the laser behind the gas to be measured.Intensity measurements inserts signal processing module through cable.Signal processing module is handled detectable signal, obtains the real-time concentration of the various procedures gas of required detection.
Shown in Figure 2 is the collimated light beam deviation angle of fibre bundle cross section and ZEMAX software simulation.The present invention adopts the single-mode fiber of standard to carry out the transmission of various wavelength lasers, and the cladding diameter of standard single-mode fiber is 128um.Ideal situation, fibre bundle per two is 128um with the spacing between the fiber core.At this moment, the simulation softward result is visible from Fig. 2 bottom, because the collimated light deviation angle that respectively causes with optical fiber luminous position difference in the fibre bundle and little.Receiving end adopts large diameter condenser lens can eliminate the influence of the small fleet angle of collimation emission light fully.On the other hand; Wavelength-division multiplex closes Shu Fangfa relatively; The method that adopts fibre bundle various laser to be closed bundle is not drawn processing because of single-mode fiber not being melted, and can avoid introducing optical interference, guarantees that the performance of laser gas analyzer can not reduce because the monochromatic light road is multiplexing.
Advantage of the present invention is: the mode that the present invention adopts optical-fiber bundling is carried out multiplexing detection with multi-wavelength's laser; This method can effectively be avoided the optical noise introduced because of the WDM device processing problems; Improve the accuracy of apparatus measures concentration, and can reduce cost.
Description of drawings
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is fibre bundle multiplexing structure and software simulation collimated light beam fleet angle.
Embodiment
As shown in Figure 1; The laser gas analyzer of the multiplexing measurement of a kind of polycomponent; Include Laser Drive control circuit 1, three encapsulated laser 2, optical-fiber bundling device 3, collimation lens 6, Optical Receivers 7 and signal Processing and display modules 8; First encapsulated laser is measured concentration of oxygen; Second and the 3rd encapsulated laser measured carbon monoxide and concentration of carbon dioxide respectively, 1 modulation of described Laser Drive control circuit, drives described three encapsulated laser 2 and sends different wavelength of laser, and wherein the optical maser wavelength sent of first encapsulated laser is 0.7 μ m; Second and the 3rd optical maser wavelength that encapsulated laser is sent is 1.5 μ m; Be connected to 3, three single-mode fibers of a single-mode fiber 3 on the tail optical fiber of three encapsulated laser 2 respectively and synthesize fibre bundle 5 through behind the described optical-fiber bundling device 4, laser penetrates and incides on the described collimation lens 6 from the afterbody of fibre bundle 5; Passing gas to be measured through the laser behind the collimation gets into described Optical Receivers 7 and collects light, divides photodetection; Dividing the photodetection concrete grammar is time division multiplex or wavelength-division multiplex method, will pass through optical signal transmission after the branch photodetection to described signal Processing and display module 8, and 8 pairs of light signals of signal Processing and display module average, after the filtering, nonlinear fitting algorithm process; Obtain the concentration of three kinds of gases, and respectively concentration value is shown.The cutoff wavelength of described single-mode fiber 3 guarantees that greater than wavelength maximum in the various laser various laser transmit maintenance single mode, the optical noise of having avoided the optical fiber multimode to cause in single-mode fiber 3; Described Optical Receivers 7 transfers signals to signal Processing and display module 8 through cable; Used large diameter condenser lens to collect laser in the described Optical Receivers 7; With compensation because each the optical fiber luminous position collimation emission angle that causes problem of difference to some extent that differs in the fibre bundle 5; Software simulation result as shown in Figure 2 can know the influence of adopting the emission angle difference that large diameter condenser lens fully can compensated optical fiber bundle 5 brings; Can according to the difference of the gas that will measure, make encapsulated laser 2 send with the laser of the corresponding wavelength of gas that will measure; According to what of the gaseous species that will measure, can increase or reduce the quantity of encapsulated laser 2, reach the purpose of measurement multiple gases concentration.
Claims (6)
1. the laser gas analyzer of the multiplexing measurement of polycomponent; It is characterized in that: include Laser Drive control circuit, three encapsulated laser, optical-fiber bundling device, collimation lens, Optical Receivers and signal Processing and display module; First encapsulated laser is measured concentration of oxygen; Second and the 3rd encapsulated laser measured carbon monoxide and concentration of carbon dioxide respectively; The modulation of described Laser Drive control circuit, drive described three encapsulated laser and send different wavelength of laser, wherein the optical maser wavelength sent of first encapsulated laser is 0.7 μ m, and second and the 3rd optical maser wavelength that encapsulated laser is sent is 1.5 μ m; Be connected to a single-mode fiber on the tail optical fiber of three encapsulated laser respectively; Three single-mode fibers synthesize fibre bundle through behind the described optical-fiber bundling devices, and laser penetrates and incides on the described collimation lens from the afterbody of fibre bundle, pass gas to be measured through the laser behind the collimation and get into described Optical Receivers and collect light, divide photodetection; To pass through optical signal transmission after the branch photodetection to described signal Processing and display module; Signal Processing and display module average, after the filtering, nonlinear fitting algorithm process, obtain the concentration of three kinds of gases, and respectively concentration value is shown light signal.
2. the laser gas analyzer of the multiplexing measurement of polycomponent according to claim 1 is characterized in that: the cutoff wavelength of described single-mode fiber is greater than wavelength maximum in three kinds of laser.
3. the laser gas analyzer of the multiplexing measurement of polycomponent according to claim 1 is characterized in that: described Optical Receivers arrives signal Processing and display module through cable with optical signal transmission.
4. the laser gas analyzer of the multiplexing measurement of polycomponent according to claim 1 is characterized in that: used large diameter condenser lens to collect laser in the described Optical Receivers.
5. the laser gas analyzer of the multiplexing measurement of polycomponent according to claim 1 is characterized in that: described minute photodetection concrete grammar is time division multiplex or wavelength-division multiplex method.
6. the laser gas analyzer of the multiplexing measurement of polycomponent according to claim 1 is characterized in that: according to the difference of the gas that will measure, make encapsulated laser send with the laser of the corresponding wavelength of gas that will measure; According to what of the gaseous species that will measure, can increase or reduce the quantity of encapsulated laser.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103115888A (en) * | 2013-02-02 | 2013-05-22 | 中国科学院安徽光学精密机械研究所 | Time division multiplexing system for data collection by utilizing differential absorption lidar |
| CN103439292A (en) * | 2013-09-11 | 2013-12-11 | 清华大学 | Multi-channel laser absorption spectrum measuring system |
| CN103592253A (en) * | 2013-11-06 | 2014-02-19 | 安徽皖仪科技股份有限公司 | Laser gas analyzer for precise temperature compensation in concentration of gas to be measured |
| CN103604773A (en) * | 2013-11-22 | 2014-02-26 | 长春理工大学 | Laser beam combiner for simultaneously detecting various types of gas of TDLAS (Tunable Diode Laser Absorption Spectroscopy) |
| CN106872401A (en) * | 2017-02-27 | 2017-06-20 | 重庆大学 | A kind of distributed infrared laser multi-parameter gas on-line detecting system |
| JP2018506027A (en) * | 2014-12-23 | 2018-03-01 | ゾロ テクノロジーズ，インコーポレイティド | TDLAS structure for wide spacing wavelengths |
| CN109900648A (en) * | 2019-03-20 | 2019-06-18 | 重庆梅安森科技股份有限公司 | Distributed optical fiber sensor applied to underground pipe gallery |
| CN110553986A (en) * | 2019-08-26 | 2019-12-10 | 国网吉林省电力有限公司四平供电公司 | Multifunctional comprehensive analyzer for each component of decomposition product in SF6 gas |
| CN110567912A (en) * | 2019-09-30 | 2019-12-13 | 大连艾科科技开发有限公司 | Carbon monoxide concentration detection module, carbon monoxide concentration telemeter and application |
| CN111444466A (en) * | 2020-03-24 | 2020-07-24 | 中国科学院长春光学精密机械与物理研究所 | Method and device for establishing binary absorption aliasing spectrum detection model and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103115888A (en) * | 2013-02-02 | 2013-05-22 | 中国科学院安徽光学精密机械研究所 | Time division multiplexing system for data collection by utilizing differential absorption lidar |
| CN103439292A (en) * | 2013-09-11 | 2013-12-11 | 清华大学 | Multi-channel laser absorption spectrum measuring system |
| CN103592253A (en) * | 2013-11-06 | 2014-02-19 | 安徽皖仪科技股份有限公司 | Laser gas analyzer for precise temperature compensation in concentration of gas to be measured |
| CN103604773A (en) * | 2013-11-22 | 2014-02-26 | 长春理工大学 | Laser beam combiner for simultaneously detecting various types of gas of TDLAS (Tunable Diode Laser Absorption Spectroscopy) |
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| JP2018506027A (en) * | 2014-12-23 | 2018-03-01 | ゾロ テクノロジーズ，インコーポレイティド | TDLAS structure for wide spacing wavelengths |
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| US10830698B2 (en) | 2014-12-23 | 2020-11-10 | Onpoint Technologies, Llc | TDLAS architecture for widely spaced wavelength |
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| CN106872401A (en) * | 2017-02-27 | 2017-06-20 | 重庆大学 | A kind of distributed infrared laser multi-parameter gas on-line detecting system |
| CN109900648A (en) * | 2019-03-20 | 2019-06-18 | 重庆梅安森科技股份有限公司 | Distributed optical fiber sensor applied to underground pipe gallery |
| CN110553986A (en) * | 2019-08-26 | 2019-12-10 | 国网吉林省电力有限公司四平供电公司 | Multifunctional comprehensive analyzer for each component of decomposition product in SF6 gas |
| CN110567912A (en) * | 2019-09-30 | 2019-12-13 | 大连艾科科技开发有限公司 | Carbon monoxide concentration detection module, carbon monoxide concentration telemeter and application |
| CN111444466A (en) * | 2020-03-24 | 2020-07-24 | 中国科学院长春光学精密机械与物理研究所 | Method and device for establishing binary absorption aliasing spectrum detection model and electronic equipment |
| CN111444466B (en) * | 2020-03-24 | 2021-12-31 | 中国科学院长春光学精密机械与物理研究所 | Method and device for establishing binary absorption aliasing spectrum detection model and electronic equipment |
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Application publication date: 20120905 |