CN103257110A - Signal transmission method for laser online gas analysis and transmission device thereof - Google Patents
Signal transmission method for laser online gas analysis and transmission device thereof Download PDFInfo
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- CN103257110A CN103257110A CN2012100338856A CN201210033885A CN103257110A CN 103257110 A CN103257110 A CN 103257110A CN 2012100338856 A CN2012100338856 A CN 2012100338856A CN 201210033885 A CN201210033885 A CN 201210033885A CN 103257110 A CN103257110 A CN 103257110A
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Abstract
The invention provides a DLAS (diode laser absorption spectroscopy) technology based signal transmission method for laser online gas analysis and a transmission device thereof, as well as a laser online gas analysis instrument equipped with the signal transmission device. The method includes: transmitting a measuring light beam emitted by a semiconductor laser device to a measuring position through output optical fiber, setting an active optical-optical conversion module at the receiving end of a measuring unit to receive free space laser absorbed by a measured gas, amplifying a signal and then coupling it to the output optical fiber so as to be transmitted to a photoelectric detector at a distal end. Compared with existing laser online gas analysis instrument's signal transmission devices using cable transmission electric signals and using a passive optical coupled device to receive optical signals, etc., optical fiber transmission has small optical signal attenuation, so that remote signal transmission can be realized. Also, optical signals have strong anti-electromagnetic interference ability, thus realizing electric isolation so as to achieve the explosion proof purpose.
Description
Technical field
The present invention relates to the gas concentration analysis field, particularly a kind of method for transmitting signals and transmitting device thereof for the online gas analysis of laser, and the online gas analysis instrument of laser with this signal transmitting apparatus.
Background technology
DLAS (Diode Laser Absorption Spectroscopy, semi-conductor laser absorption spectrum) technology is based on laser energy is absorbed the principle measure gas concentrations that forms absorption spectrum by gas molecule " frequency-selecting " technology.Specifically, when the laser beam of the specific wavelength that semiconductor laser is launched was passed tested gas, tested gas absorbed laser beam and causes laser intensity to produce decay, and the decay of laser intensity is directly proportional with tested gas content.Therefore, by measuring the concentration that the laser intensity decay can be known tested gas.
Have the following advantages based on the online gas analysis instrument of the laser of DLAS technology: (1) rugged surroundings adaptive faculty is strong, need not the pre-service of sampling, and realizes on-the-spot on-line continuous measurement; (2) can overcome the interference of background gas, moisture and dust, the measuring accuracy height; (3) response speed is fast, can realize the management of industrial process real-time online; (4) can the Measurement and analysis multiple gases, wide application.
The online gas analysis instrument of laser comprises CPU (central processing unit) and measuring unit.Because LASER Light Source and conventional fiber that the DLAS technology adopts have favorable compatibility, so semiconductor laser can be arranged in the CPU (central processing unit), by optical fiber Laser Transmission is arrived measure field, thereby reduce the complicacy of the transmitting terminal of measuring unit greatly.If the receiving end at measuring unit also can transfer signals to CPU (central processing unit) by optical fiber, can strengthen the ability of anti-electromagnetic interference capability, adaptation rugged surroundings and the explosion-proof environment of the online gas analyzer instrument of laser greatly.But will be very difficult through the direct coupled into optical fibres of free space laser of tested gas absorption at receiving end, the light path degree of regulation need reach the micron order precision, is difficult to more realize in industry spot; Perhaps use expensive space laser-fiber coupler at receiving end, but this passive optical coupler spare can cause the loss of luminous energy in coupling process, reduces the signal to noise ratio (S/N ratio) of signal, and then influences accuracy of detection, and direct-coupled light signal is very weak, is unfavorable for long Distance Transmission.
Prior art normally arranges photodetector at the receiving end of measuring unit, be converted to electric signal with the light signal that will be received, thereby avoid the loss of luminous energy in coupling and transmission course, preserve the information in the light signal to greatest extent, but photodetector output is analog electrical signal, be interfered easily by cable transmission, be unfavorable for long Distance Transmission.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solve based in the online gas analysis instrument of the laser of DLAS technology, use cable transmission signal anti-electromagnetic interference capability is weak, transmission range is near, and uses passive optical coupler spare to receive the problem that signal causes signal attenuation.
For achieving the above object, one aspect of the present invention provides a kind of method for transmitting signals for the online gas analysis of laser, may further comprise the steps: semiconductor laser emission measurement light beam; Described measuring beam transfers to the transmitting terminal of measuring unit by output optical fibre; Described measuring beam penetrates described output optical fibre at described transmitting terminal and forms the free space laser beam, injects tested gas; Use active light-light modular converter to receive free space laser after described tested gas absorption at the receiving end of measuring unit, conversion is enlarged into the CPU (central processing unit) that transfers to far-end behind the optical-fiber laser by input optical fibre.
In embodiments of the present invention, described active light-light modular converter receives the free space laser after described tested gas absorption, and the step that conversion is enlarged into optical-fiber laser comprises: the described free space laser after described tested gas absorption inputs to photodetector and is converted to current signal; Described current signal inputs to signal amplification circuit and is converted to voltage signal and amplification; Voltage signal after the amplification inputs to drive circuit for laser, the electric current of the voltage signal modulation diode laser of described drive circuit for laser after according to described amplification; Described diode laser is according to the described optical-fiber laser of current emission after modulating.
In embodiments of the present invention, the optical maser wavelength that described active light-light modular converter receives be the continuous wavelength in the wavelength coverage from the visible light to the near infrared light, and the optical maser wavelength of output is ultraviolet light, visible light, the interior arbitrary wavelength of near-infrared wavelength scope.
In embodiments of the present invention, semiconductor laser, CPU (central processing unit) and the optical signal transmission between the measuring unit at scene all realize by optical fiber, because the fiber middle light signal decay is little, so the one way transmission range maximum of described measuring beam can reach greater than 1Km.
In embodiments of the present invention, described measuring beam transfers to the transmitting terminal of described measuring unit through collimator apparatus, is that parallel beam is injected described tested gas afterwards with described free space laser beam datum.
The present invention provides a kind of signal transmitting apparatus for the online gas analysis of laser on the other hand, comprise: CPU (central processing unit), comprise semiconductor laser and first photodetector, described semiconductor laser is used for the emission measurement light beam, and described first photodetector is used for the optical-fiber laser after tested gas absorption is converted to electric signal; Measuring unit, comprise the transmitting terminal and the receiving end that lay respectively at tested gas pipeline two ends, described transmitting terminal is used for receiving described measuring beam and its form with free space laser is injected described tested gas, described receiving terminal is provided with active light-light modular converter, is used for the described free space laser after described tested gas absorption is converted to described optical-fiber laser; Compound cable, described compound cable is used for connecting described CPU (central processing unit) and measuring unit, comprise output optical fibre and input optical fibre, wherein, the two ends of described output optical fibre are connected with the transmitting terminal of described semiconductor laser and described measuring unit respectively, be used for described measuring beam is transferred to the transmitting terminal of described measuring unit, the two ends of described input optical fibre are connected with described first photodetector with described active light-light modular converter respectively, are used for described optical-fiber laser is transferred to described first photodetector.
In embodiments of the present invention, described active light-light modular converter comprises: second photodetector is used for the described free space laser after described tested gas partially absorbs is converted to current signal; Signal amplification circuit is connected with described second photodetector, is used for described current signal being converted to voltage signal and amplifying; Drive circuit for laser is connected with described signal amplification circuit, and being used for provides permanent power control and overcurrent protection to described diode laser, and according to the voltage signal after amplifying the electric current of described diode laser is modulated; Described diode laser is connected with described drive circuit for laser, is used for according to the described optical-fiber laser of current emission after the modulation; Power interface is used for inserting external power source to described active light-light modular converter power supply.By the receiving end at measuring unit active light-light modular converter is set, be used for receiving the free space laser after tested gas absorption, light signal after output is amplified also is coupled into input optical fibre, to realize by the conversion amplification of free space laser to optical-fiber laser.
In embodiments of the present invention, kind according to measured gas can be selected different semiconductor laser wavelengths for use, the optical maser wavelength that described active light-light modular converter receives is the continuous wavelength in the wavelength coverage from the visible light to the near infrared light, the optical maser wavelength of output can be the arbitrary wavelength in ultraviolet light, visible light, the near-infrared wavelength scope according to selected diode laser, for example, in the preferred embodiment of the invention, adopt the diode laser of 1310nm near-infrared band.
In embodiments of the present invention, described compound cable also comprises cable, and described cable connects described power interface and described external power source with to described active light-light modular converter power supply.
In embodiments of the present invention, described active light-light modular converter adopts the power supply of low-voltage direct (for example 24V) power supply source, and supply current is less than 100mA, satisfies the safety anti-explosive requirement so can guarantee the thermal effect that produces etc.
In embodiments of the present invention, described output optical fibre and input optical fibre are single-mode fiber.The transmission range of single-mode fiber can be higher than the transmission range of multimode optical fiber far away up to 50-100km, so more be conducive to realize the signal long-distance transmissions.
In embodiments of the present invention, the transmitting terminal of described measuring unit is provided with collimator apparatus, and the described free space laser alignment that described collimator apparatus is used for penetrating from described output optical fibre is to inject tested gas again behind the parallel beam.
Further aspect of the present invention also provides a kind of laser online gas analyzer instrument, comprises aforesaid signal transmitting apparatus for the online gas analyzer of laser.
In embodiments of the present invention, described CPU (central processing unit) also comprises control and signal processing module, described control is connected with described semiconductor laser, described first photodetector with signal processing module, the intensity and the wavelength that are used for the measuring beam of the described semiconductor laser emission of control, and the concentration of calculating tested gas according to the electric signal of described first photodetector feedback.
The invention provides a kind of method for transmitting signals and transmitting device thereof of being used for the online gas analysis of laser based on the DLAS technology, and the online gas analysis instrument of laser with this signal transmitting apparatus.Be transferred to the measuring position by the measuring beam with the semiconductor laser emission by output optical fibre, receiving end at measuring unit arranges active light-light dress die change piece reception through the free space laser after the tested gas absorption, will be coupled into the photodetector that output optical fibre is transferred to far-end again after the signal amplification.With respect to the signal transmitting apparatus that uses the online gas analyzers of existing laser such as cable transmission electric signal and use passive optical coupler spare receiving optical signals, the advantage of Optical Fiber Transmission is:
(1) Optical Fiber Transmission has little, the bandwidth of signal attenuation, and the optical fiber own vol is little, in light weight, thereby can realize the signal long-distance transmissions;
(2) fiber optic cables have bigger impedance to the electromagnetic noise such as radio, motor or other adjacent cables, to the strong interference immunity of electrical noise;
(3) optical fiber adopts glass material, and the insulativity height can be because reasons such as short circuit, thunderbolt produce spark, so high safety, are suitable for occasions such as inflammable, explosive.
The aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the method for transmitting signals process flow diagram of the online gas analysis of laser of the embodiment of the invention;
Fig. 2 is the structural representation of the online gas analysis instrument of laser of the embodiment of the invention;
Fig. 3 is the structural representation of the active light-light modular converter of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical or similar label is represented identical or similar elements or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
Need to prove that in addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".
In description of the invention, need to prove that unless clear and definite regulation and restriction are arranged in addition, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be fixedly connected, also can be to removably connect, or connect integratedly; Can be mechanical connection, also can be to be electrically connected; Can be directly to link to each other, also can link to each other indirectly by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete implication in the present invention.
The invention provides a kind of method for transmitting signals for the online gas analysis of laser, Fig. 1 is the method for transmitting signals process flow diagram of the online gas analysis of laser of the embodiment of the invention, may further comprise the steps:
Step S01: semiconductor laser emission measurement light beam.In the present embodiment, the measuring beam that semiconductor laser emission was modulated, semiconductor laser can be integrated in the CPU (central processing unit), and this CPU (central processing unit) can place the place away from the scene, for example laboratory etc.
Step S02: measuring beam transfers to the transmitting terminal of measuring unit by output optical fibre.Measuring unit places measure field, is used for tested gas spot sampling test.
Step S03: measuring beam penetrates output optical fibre at transmitting terminal and forms the free space laser beam, injects tested gas.In the preferred embodiment of the invention, the transmitting terminal of measuring unit is provided with collimator apparatus, and measuring beam transfers to transmitting terminal through collimator apparatus, is that parallel beam is injected tested gas afterwards with described free space laser beam datum.In the present embodiment, input optical fibre and output optical fibre are single-mode fiber.
Step S04: use active light-light modular converter to receive free space laser after tested gas absorption at the receiving end of measuring unit, conversion is enlarged into the CPU (central processing unit) that transfers to far-end behind the optical-fiber laser by input optical fibre.In embodiments of the present invention, the step of active light-light modular converter reception conversion amplifying optical signals specifically can may further comprise the steps: the free space laser after tested gas absorption inputs to photodetector and is converted to current signal; Current signal inputs to signal amplification circuit and is converted to voltage signal and amplification; Voltage signal after the amplification inputs to drive circuit for laser, and drive circuit for laser is according to the electric current of the voltage signal modulation diode laser after amplifying; Diode laser is according to the current emission optical-fiber laser after modulating.After the optical-fiber laser signal transfers to CPU (central processing unit), can again this optical-fiber laser signal be converted to electric signal through the photodetector of CPU (central processing unit) and carry out tested gas concentration analysis.In embodiments of the present invention, the optical maser wavelength that active light-light modular converter receives be the continuous wavelength in the wavelength coverage from the visible light to the near infrared light, and the optical maser wavelength of output is ultraviolet light, visible light, the interior arbitrary wavelength of near-infrared wavelength scope.That is, the laser signal wavelength of the transmitting terminal of measuring unit reception can be different with the laser signal wavelength of the receiving end output of measuring unit.
In embodiments of the present invention, semiconductor laser, CPU (central processing unit) and the optical signal transmission between the measuring unit at scene all realize by optical fiber, because the fiber middle light signal decay is little, so the one way transmission range maximum of described measuring beam can reach greater than 1Km, is conducive to realize the signal long-distance transmissions.
Based on above-mentioned method for transmitting signals, the present invention further provides a kind of signal transmitting apparatus for the online gas analysis of laser and the online gas analysis instrument of laser thereof, Figure 2 shows that the structural representation of the online gas analysis instrument of laser of the embodiment of the invention.As shown in Figure 2, the signal transmitting apparatus that should be used for the online gas analyzer of laser comprises CPU (central processing unit) 100 and measuring unit 200, and the composite cable 300 that connects CPU (central processing unit) 100 and measuring unit 200.
Wherein, CPU (central processing unit) 100 comprises semiconductor laser 2 and first photodetector 3, and semiconductor laser 2 is used for the measuring beam that emission was modulated, and first photodetector 3 is used for the optical-fiber laser after tested gas absorption is converted to electric signal.Further, in preferred embodiment of the present invention, the CPU (central processing unit) 100 of the online gas analyzer instrument of laser can also comprise control and signal processing module 1 and low-voltage dc power supply 4, control is connected with semiconductor laser 2, first photodetector 3 with signal processing module 1, be used for laser current by control semiconductor laser 2 and temperature with intensity and the wavelength of the measuring beam of controlling its emission, and the concentration of calculating tested gas according to the electric signal of first photodetector, 3 feedbacks.
Fig. 3 is the structural representation of active light-light modular converter 7.As shown in Figure 3, in preferred embodiment of the present invention, active light-light modular converter 7 comprises: second photodetector 701, signal amplification circuit 702, laser drive circuit 703, diode laser 704 and power interface 705.Wherein, second photodetector 701 is used for the free space laser after tested gas partially absorbs is converted to current signal; Signal amplification circuit 702 is connected with second photodetector 701, is used for that current signal is carried out current-voltage and is converted to voltage signal and amplification; Drive circuit for laser 703 is connected with signal amplification circuit 702, and being used for provides permanent power control and overcurrent protection function to diode laser 704, and according to the voltage signal after amplifying the laser current of diode laser 704 is modulated; Diode laser 704 is connected with drive circuit for laser 703, is used for according to the emission of the laser current after modulation laser intensity signal, and this laser intensity signal is coupled into output optical fibre laser in the tail optical fiber of diode laser 704; Power interface 705 is used for inserting external power source to active light-light modular converter 7 power supplies.By the receiving end at measuring unit active light-light modular converter is set, be used for receiving the free space laser after tested gas absorption, light signal after output is amplified also is coupled into input optical fibre, to realize by the conversion amplification of free space laser to optical-fiber laser.In embodiments of the present invention, kind according to measured gas can be selected different semiconductor laser wavelengths for use, the laser wavelength range that active light-light modular converter 7 receives is determined by second photodetector 701, can be the continuous wavelength in the wavelength coverage from the visible light to the near infrared light; The optical maser wavelength of output is determined by selected diode laser 704, can be the arbitrary wavelength in ultraviolet light, visible light, the near-infrared wavelength scope.For example, in the preferred embodiment of the invention, second photodetector 701 can be that wavelength coverage is the near infrared detector of 800-1800nm, and diode laser 704 can be that wavelength is the diode laser of the near-infrared band of 1310nm.
The invention provides a kind of based on the signal transmitting apparatus that is used for the online gas analysis of laser of DLAS technology and the online gas analysis instrument of laser with this signal transmitting apparatus.Be transferred to the measuring position by the measuring beam with the semiconductor laser emission by output optical fibre, receiving end at measuring unit arranges active light-light dress die change piece reception through the free space laser after the tested gas absorption, will be coupled into the photodetector that output optical fibre is transferred to far-end again after the signal amplification.With respect to the signal transmitting apparatus that uses the online gas analyzers of existing laser such as cable transmission electric signal and use passive optical coupler spare receiving optical signals, the attenuated optical signal of Optical Fiber Transmission is little, thereby can realize the signal long-distance transmissions, and the light signal anti-electromagnetic interference capability is strong, thereby can realize that electrical isolation is to reach explosion-proof purpose.
In the description of this instructions, concrete feature, structure, material or characteristics that the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example description are contained at least one embodiment of the present invention or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete feature, structure, material or the characteristics of description can be with the suitable manner combination in any one or more embodiment or example.Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (14)
1. method for transmitting signals that is used for the online gas analysis of laser may further comprise the steps:
Semiconductor laser emission measurement light beam;
Described measuring beam transfers to the transmitting terminal of measuring unit by output optical fibre;
Described measuring beam penetrates described output optical fibre at described transmitting terminal and forms the free space laser beam, injects tested gas;
Use active light-light modular converter to receive free space laser after described tested gas absorption at the receiving end of measuring unit, conversion is enlarged into the CPU (central processing unit) that transfers to far-end behind the optical-fiber laser by input optical fibre.
2. the method for transmitting signals for the online gas analysis of laser as claimed in claim 1 is characterized in that, described active light-light modular converter receives the free space laser after described tested gas absorption, and the step that conversion is enlarged into optical-fiber laser comprises:
Described free space laser after described tested gas absorption inputs to photodetector and is converted to current signal;
Described current signal inputs to signal amplification circuit and is converted to voltage signal and amplification;
Voltage signal after the amplification inputs to drive circuit for laser, the electric current of the voltage signal modulation diode laser of described drive circuit for laser after according to described amplification;
Described diode laser is according to the described optical-fiber laser of current emission after modulating.
3. the method for transmitting signals for the online gas analysis of laser as claimed in claim 2, it is characterized in that, the optical maser wavelength that described active light-light modular converter receives be the continuous wavelength in the wavelength coverage from the visible light to the near infrared light, and the optical maser wavelength of output is ultraviolet light, visible light, the interior arbitrary wavelength of near-infrared wavelength scope.
4. the method for transmitting signals for the online gas analysis of laser as claimed in claim 1 is characterized in that, the one way transmission range of described measuring beam is greater than 1Km.
5. the method for transmitting signals for the online gas analysis of laser as claimed in claim 1, it is characterized in that, described measuring beam transfers to the transmitting terminal of described measuring unit through collimator apparatus, is that parallel beam is injected described tested gas afterwards with described free space laser beam datum.
6. a signal transmitting apparatus that is used for the online gas analyzer of laser is characterized in that, comprising:
CPU (central processing unit) comprises semiconductor laser and first photodetector, and described semiconductor laser is used for the emission measurement light beam, and described first photodetector is used for the optical-fiber laser after tested gas absorption is converted to electric signal;
Measuring unit, comprise the transmitting terminal and the receiving end that lay respectively at tested gas pipeline two ends, described transmitting terminal is used for receiving described measuring beam and its form with free space laser is injected described tested gas, described receiving terminal is provided with active light-light modular converter, is used for the described free space laser after described tested gas absorption is converted to described optical-fiber laser;
Compound cable, described compound cable is used for connecting described CPU (central processing unit) and measuring unit, comprise output optical fibre and input optical fibre, wherein, the two ends of described output optical fibre are connected with the transmitting terminal of described semiconductor laser and described measuring unit respectively, be used for described measuring beam is transferred to the transmitting terminal of described measuring unit, the two ends of described input optical fibre are connected with described first photodetector with described active light-light modular converter respectively, are used for described optical-fiber laser is transferred to described first photodetector.
7. the signal transmitting apparatus for the online gas analyzer of laser as claimed in claim 1 is characterized in that, described active light-light modular converter comprises:
Second photodetector is used for the described free space laser after described tested gas absorption is converted to current signal;
Signal amplification circuit is connected with described second photodetector, is used for described current signal being converted to voltage signal and amplifying;
Drive circuit for laser is connected with described signal amplification circuit, and being used for provides permanent power control and overcurrent protection to described diode laser, and according to the voltage signal after amplifying the electric current of described diode laser is modulated;
Described diode laser is connected with described drive circuit for laser, is used for according to the described optical-fiber laser of current emission after the modulation;
Power interface is used for inserting external power source to described active light-light modular converter power supply.
8. the signal transmitting apparatus for the online gas analyzer of laser as claimed in claim 7, it is characterized in that, the optical maser wavelength that described active light-light modular converter receives be the continuous wavelength in the wavelength coverage from the visible light to the near infrared light, and the optical maser wavelength of output is ultraviolet light, visible light, the interior arbitrary wavelength of near-infrared wavelength scope.
9. the signal transmitting apparatus for the online gas analyzer of laser as claimed in claim 7 is characterized in that, described compound cable also comprises cable, and described cable connects described power interface and described external power source with to described active light-light modular converter power supply.
10. the signal transmitting apparatus for the online gas analyzer of laser as claimed in claim 6 is characterized in that, the supply current of described active light-light modular converter is less than 100mA.
11. the signal transmitting apparatus for the online gas analyzer of laser as claimed in claim 6 is characterized in that, described input optical fibre and output optical fibre are single-mode fiber.
12. the signal transmitting apparatus for the online gas analyzer of laser as claimed in claim 6, it is characterized in that, the transmitting terminal of described measuring unit is provided with collimator apparatus, and the described free space laser alignment that described collimator apparatus is used for penetrating from described output optical fibre is parallel beam.
13. the online gas analysis instrument of laser is characterized in that, comprising: as each described signal transmitting apparatus for the online gas analyzer of laser of claim 6-12.
14. the online gas analysis instrument of laser as claimed in claim 13, it is characterized in that, described CPU (central processing unit) also comprises control and signal processing module, described control is connected with described semiconductor laser, described first photodetector with signal processing module, the intensity and the wavelength that are used for the measuring beam of the described semiconductor laser emission of control, and the concentration of calculating tested gas according to the electric signal of described first photodetector feedback.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475326A (en) * | 2013-09-03 | 2013-12-25 | 周健 | Digital double-phase lock-in amplifier for laser online gas analyzer |
| CN109215297A (en) * | 2018-11-13 | 2019-01-15 | 珠海任驰光电科技有限公司 | A kind of time-sharing multiplex optical fiber flammable gas alarm device and method |
| CN110411980A (en) * | 2019-09-04 | 2019-11-05 | 北京市人工影响天气办公室 | Cloud chamber moisture monitoring system |
| CN114216860A (en) * | 2021-11-29 | 2022-03-22 | 国网重庆市电力公司电力科学研究院 | System and method for detecting decomposition products of insulating gas of high-voltage equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59155741A (en) * | 1983-02-24 | 1984-09-04 | Mitsubishi Heavy Ind Ltd | Particle detecting apparatus |
| CN1426180A (en) * | 2002-12-12 | 2003-06-25 | 武汉光迅科技有限责任公司 | Light wave length/mode converter |
| CN2571077Y (en) * | 2002-09-20 | 2003-09-03 | 肖登侯 | Temperature detecting remote digital transmission equipment based on optical fiber |
| US6814501B2 (en) * | 2001-11-14 | 2004-11-09 | Fuji Xerox Co., Ltd. | Light-emitting device and optical transmission unit |
| CN1888865A (en) * | 2006-07-19 | 2007-01-03 | 中国科学院安徽光学精密机械研究所 | Opening natural gas leaking multi-channel monitoring method and light path structure |
-
2012
- 2012-02-15 CN CN2012100338856A patent/CN103257110A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59155741A (en) * | 1983-02-24 | 1984-09-04 | Mitsubishi Heavy Ind Ltd | Particle detecting apparatus |
| US6814501B2 (en) * | 2001-11-14 | 2004-11-09 | Fuji Xerox Co., Ltd. | Light-emitting device and optical transmission unit |
| CN2571077Y (en) * | 2002-09-20 | 2003-09-03 | 肖登侯 | Temperature detecting remote digital transmission equipment based on optical fiber |
| CN1426180A (en) * | 2002-12-12 | 2003-06-25 | 武汉光迅科技有限责任公司 | Light wave length/mode converter |
| CN1888865A (en) * | 2006-07-19 | 2007-01-03 | 中国科学院安徽光学精密机械研究所 | Opening natural gas leaking multi-channel monitoring method and light path structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475326A (en) * | 2013-09-03 | 2013-12-25 | 周健 | Digital double-phase lock-in amplifier for laser online gas analyzer |
| CN109215297A (en) * | 2018-11-13 | 2019-01-15 | 珠海任驰光电科技有限公司 | A kind of time-sharing multiplex optical fiber flammable gas alarm device and method |
| CN110411980A (en) * | 2019-09-04 | 2019-11-05 | 北京市人工影响天气办公室 | Cloud chamber moisture monitoring system |
| CN114216860A (en) * | 2021-11-29 | 2022-03-22 | 国网重庆市电力公司电力科学研究院 | System and method for detecting decomposition products of insulating gas of high-voltage equipment |
| CN114216860B (en) * | 2021-11-29 | 2024-03-19 | 国网重庆市电力公司电力科学研究院 | System and method for detecting decomposition products of insulating gas of high-voltage equipment |
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Application publication date: 20130821 |