CN104132911B - Open type long optical distance CO and CH4 online testing instrument - Google Patents
Open type long optical distance CO and CH4 online testing instrument Download PDFInfo
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- CN104132911B CN104132911B CN201410380325.7A CN201410380325A CN104132911B CN 104132911 B CN104132911 B CN 104132911B CN 201410380325 A CN201410380325 A CN 201410380325A CN 104132911 B CN104132911 B CN 104132911B
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Abstract
The invention discloses an open type long optical distance CO and CH4 online testing instrument which comprises a host box and an open type long optical distance system, a DFB (distributed feedback) semiconductor infrared laser with a center wavelength of 2334nm and a corresponding laser current control and temperature control circuit and a signal generating circuit are arranged in the host box, the host box is also provided with an off-axis parabolic mirror and a photoelectric detector; a modulation signal generated by the signal generating circuit effects on the laser current control and temperature control circuit to tune the DFB (distributed feedback) semiconductor infrared laser to produce laser with the center wavelength of 2334nm for scanning CO and CH4 absorption spectrums, the laser is perpendicularly emitted into an open type long optical distance optical path, and is reflected by a corner cube reflector to return along the original optical path to the photoelectric detector to obtain the CO and CH4 gas absorption spectrums, spectrum signals are collected, and the column concentrations of CO and CH4 gases can be calculated by inversion by a multispectral fitting algorithm, and are displayed and managed on an upper computer.
Description
Technical field:
The invention belongs to environmental gas detection field, be specifically related to a kind of atmospheric ambient gas CO and CH4Open long-optical path on-line checking instrument.
Background technology:
Along with the quickening of modern society's rhythm of life, air environmental pollution is increasingly severe, and wherein deriving from coal-fired and motor-vehicle tail-gas CO is one of important pollutant of air, is to study the important tracer that pollutant convert in an atmosphere, carry and redistribute；Although CO itself is not the direct contributor of greenhouse effect, but its Control of chemical reaction with OH free radical CO2、CH4、O3Deng concentration distribution and the change of other greenhouse gases, methane (CH4) it is that atmospheric level is only second to CO2Greenhouse gases, belong to Hydrocarbon, chemical property is more stable, it is possible to consumingly absorb earth long-wave radiation and have greenhouse effect, and then to global climate produce significant impact, therefore Atmospheric CO and CH4The observational study work of concentration is the most necessary.
The method carrying out gas detecting at present at home is broadly divided into electricity formula gas detecting method, optical type gas detection method, electrochemical gas detection method, gas chromatography and macromolecular material gas detecting method etc..
Electricity formula gas detecting method is the concentration knowing gas by detecting the change of the electrical properties relevant with gas concentration.
Optical type gas detection method is the measurement by the optical characteristics to gas, differentiate gas and detect its concentration, according to the difference of utilized optical property, the gas sensor of this kind of optical method is broadly divided into spectral absorption type, photoionization type, light interference type, fluorescent type and chemiluminescent etc..
Wherein spectral absorption type gas detecting is that the characteristic absorption spectrum according to gas differentiates and analyzes its concentration, its principle is: the characteristic absorption spectrum of gas with various is different, and various gas becomes certain relation at the absorbance of the most different characteristic absorption spectrums with the concentration of gas, when there being light to irradiate the air chamber being filled with tested gas, optical source wavelength is in the gas component of its characteristic wave strong point and absorbs a part of light, and the relation between incident intensity, reflective light intensity and characteristic wavelength gas component follows Lambert-Beer law.The development trend of spectral absorption formula gas sensor just develops towards intelligent, practical, market-oriented direction.
Conventional electrochemical sensor can be divided into three types: MOS type, electrochemistry solid electrolyte type and electrochemistry solid macromolecular electrolyte type etc..Their shortcoming is output signal and gas volume fraction is linear relationship；It is not suitable for being used in the gas detecting of high-volume fractional；Sensitivity, selectivity are poor etc..Different gas is different by the speed of chromatographic column, measures its speed and just can know gas concentration information, here it is gas chromatography principle.
Non-optical class gas sensor is respectively provided with poor stability, easily poisoning, detection needs to carry out sampling and the shortcoming of pretreatment, reduce real-time and the accuracy of system detection, and interference component is a lot, sometimes cross interference cannot be avoided at all, being difficult to accomplish on-line monitoring, system maintenance is the most more complicated.
Optical method detected gas concentration has many advantages compared with non-optical method, accurately measures and on-line monitoring, system stability as reached remote, is not easily susceptible to interference, highly sensitive, responsiveness is fast, safe and reliable, high temperature resistant, corrosion-resistant, and maintenance workload is little etc..The gas sensor being based particularly on gas near-infrared spectrum absorption techniques can realize quickly detecting the high sensitivity of gas, the most selective strong, length in service life, demarcates the advantages such as simple, cost is low, be easily achieved.
Although, abroad for research and the application of gas detection technology, the starting of some developed countries is compared early, investigated a lot of gas detection methods, and has some to have been applied in practice.It is contemplated that the most domestic gas concentration detector market, it is all that some external products are occupied, although highly sensitive, fast response time, can monitor continuously, safe and reliable, but its prices are rather stiff, research and development gas detecting instrument is imperative at home.
Open long-optical path CO and CH4On-line computing model is namely based on tunable semiconductor laser spectrum tech (TDLAS), contactless online auto monitoring atmosphere pollution CO and CH4Analytical tool, there is the features such as real-time online, simultaneously monitoring.
Summary of the invention:
For overcome gas detecting instrument on some drawbacks of prior art and market defect, the present invention proposes a kind of open long-optical path CO and CH4Monitoring instrument, long light path absorption spectroscopy techniques based on open light path, use tunable diode laser absorption spectroscopy technology and Distributed Feedback Laser wavelength locking technology, utilize laser instrument all band scanning CO, a CH4Two kinds of GAS ABSORPTION, by CO and CH4The absorption spectrum of gas molecule carries out multi-parameter fitting algorithm realization to the qualitative of object gas or quantitative analysis.
The technical solution adopted in the present invention is as follows:
A kind of open long-optical path CO and CH4Monitoring instrument, including mainframe box and open long-optical path light path, near-infrared DFB semiconductor laser and corresponding laser diode current control and temperature control modules that centre wavelength is 2344mm are installed in described mainframe box, it is also equipped with signal generating circuit, the outfan of described laser temperature control module is electrically connected with the input of the temperature control end of described DFB semiconductor laser, and the outfan of described signal generating circuit and described laser diode current control and the input of temperature control modules is electrically connected；The input of described signal generating circuit is connected with electronic hardware control circuit, it is also equipped with off axis paraboloidal mirror in described mainframe box, position height adjustable gas pond is installed in the described light path between near-infrared DFB semiconductor laser and described off axis paraboloid mirror, the adjustable photodetector of position height is installed, using DFB near-infrared semiconductor laser Output of laser center wavelength tuning to 2344nm as CO and CH in described off axis paraboloid mirror mirror foci4Detection LASER Light Source, simultaneously, the modulated signal that signal generating circuit produces is superimposed upon laser diode current control and on temperature control modules, the laser of the 2344nm wavelength of described DFB near-infrared semiconductor laser is reflected formula fiber optic collimator bonder and is coupled as collimation laser, described collimation laser enters open long-optical path light path through the centre bore of off axis paraboloidal mirror, and the angle transmitting mirror reflection tailing edge original optical path being opened formula long light path light path returns, it is thus achieved that CO and CH4The absorption spectrum information of gas, the laser reflected is gathered on photodetector by the off axis paraboloidal mirror in mainframe box, photodetector optical fiber connects signal conditioning circuit, signal conditioning circuit electrical connection electronic hardware control circuit, data communication between described electronic hardware control circuit and host computer；Described electronic hardware control circuit is based on single-chip microcomputer, and described single-chip microcomputer combines multispectral fitting algorithm and calculates CO and CH4The absorption spectrum information of gas is finally inversed by CO and CH4The post concentration of gas, display management on the open long-optical path gas monitoring instrument online-monitoring software of host computer.
Described mainframe box includes that upper cover, lower cover, front panel, rear board form, connect in the middle of described rear board and have the connecting rod extending in mainframe box, described reflection type optical fiber collimation bonder, off axis paraboloidal mirror, all same with connecting rod height, when described gas pond works, position adjustments and connecting rod are with height；Be additionally provided with on described mainframe box power supply, on and off switch and and host computer between connect serial ports.On described front panel, installing wedge shape window one, wedge shape window one angle of inclination is 8 °；It is also equipped with rear board on described rear board and on and off switch, serial communication interface, and power supply input adapter are installed；Along described from paraboloidal mirror light path major axes orientation, internal one diameter of fixed installation is slightly larger than the sleeve from paraboloidal mirror optic diameter, surface blackening；Described adjustment frame can carry out the regulation of level angle and pitching；Described gas pond and the adjustable bracing frame covered that is threadably mounted at down by it of photoelectric probe position are realized；Described mainframe box is fixed on regulating the telescopic system of light path, and described reflection type optical fiber collimation bonder and off axis paraboloidal mirror have the bracing frame connecting lower cover to support respectively.
Described open long-optical path optical routing wedge shape window one, wedge shape window two and corner reflector are constituted, described wedge shape window one is arranged on described mainframe box laser emitting window, described wedge shape window two is arranged on corner reflector front end, described wedge shape window one, wedge shape window two and corner reflector all on the main optical path of laser instrument, described wedge shape window one, wedge shape window two and laser instrument main optical path out of plumb.When measuring, the laser that laser instrument is launched collimates bonder through fiber-optic transfer to reflection type optical fiber, laser after collimation sequentially passes through the centre bore of off-axis parabolic mirror, wedge shape window one, air, wedge shape window two to corner reflector, again through wedge shape window two, air, wedge shape window one to off-axis parabolic mirror after corner reflector reflects, then reflexed to detector by off-axis parabolic mirror and carry out the collection of optical signal.
The adjustable reflecting mirror of position height one it is provided with after described off axis paraboloid mirror, when calibration, gas pond and reflecting mirror are raised on the main optical path at laser place automatically, the laser that laser instrument is launched collimates bonder through fiber-optic transfer to reflection type optical fiber, laser after collimation passes through the gas pond being connected with gas, then to reflecting mirror after the centre bore of off-axis parabolic mirror, then by reflecting mirror by luminous reflectance to detector, carry out the equal scalable of the detection of optical signal, reflecting mirror and detector.
Described electronic hardware panel circuit is by using chip microcontroller, described Single Chip Microcomputer (SCM) program can realize the signal after host computer transmits information, controls generation modulated signal, collection conditioning, carry out the big function of calculating four of line shape fitting each post concentration, have the open long-optical path gas monitoring instrument online-monitoring software of independent research on described host computer, it is achieved gather data system self-inspection, gather, process, show, data management function；
The design principle of native system is:
The core technology of native system is based on tunable diode laser absorption spectroscopy (TDLAS) technology, utilizes and opens the long light path CO absorption at infrared visible waveband (2334nm) in air, in conjunction with CH4Gas molecule characteristic absorption line under this laser scanning frequency, uses spectrum simulation algorithm, obtains CO and CH4The absorbance of two kinds of gas molecules, then carry out Inversion Calculation, obtain CO and CH in air4The post concentration of two kinds of gases, exports host computer by post concentration results and light intensity parameter by serial ports in real time.
Native system uses has the LASER Light Source launching infrared visible waveband (2334nm), the laser that LASER Light Source is launched transmits to angle mirror after the absorption in open long light path air, the optical system of instrument is entered after described angle mirror reflection laser, focusing by instrumental optics system, enter detector, spectral signal is transferred to the signal of telecommunication and carries out the conditioning of signal by described detector, after digitized, just can obtain CO and CH under this open light path after inverting, analysis4The absorbance of gas, calculates post concentration and passes to host computer.
(1) long light path absorption spectroscopy techniques based on open light path.Knowing according to Beer-Lambert absorption law, the detection sensitivity of system is relevant with light path L, and light path is the longest, and the sensitivity of detection is the highest.Open light path can obtain dusty gas concentration on a large scale, so reducing the impact of local concentration fluctuation；Long light path absorption spectroscopy techniques absorbs light path by increasing, thus improves the detection sensitivity of system.
(2) based on tunable diode laser absorption spectroscopy (TDLAS) technology and Distributed Feedback Laser wavelength locking technology.The Closed loop Control of advanced electric current and temperature is applied to the locking of DFB laser wavelength, uses in the gas absorption spectra technology of tunable semiconductor laser, the stability of DFB laser wavelength can be increased substantially.
(3) multi-parameter fitting technology based on spectrum.Based on CO and CH4The multi-parameter fitting technology of gas molecules sorb spectrum, have employed lorentzian curve matching CO absworption peak and multiple CH4Absworption peak, algorithm uses multiple parameters to carry out the matching of spectrum so that algorithm itself is the most stable, have modified the impact of temperature and air pressure, is greatly improved precision and the resolution of gas absorption spectra.
Beneficial effects of the present invention is embodied in:
(1) based on DFB laser wavelength lock current and the Closed loop Control of temperature, a laser instrument all band is used can to scan CO, CH4Two kinds of GAS ABSORPTION, and use open light path to detect, there is higher sensitivity and resolution, be suitable for CO and CH in regular air quality4On-line monitoring.
(2) many light fitting algorithm is combined, to CO and CH4Absorption spectrum carries out multi-parameter fitting, and then calculating is finally inversed by CO and CH4Post concentration, have the advantages that selectivity is good, highly sensitive, precision is high.
(3) use control adjustable gas pond, position, photodetector and reflecting mirror, add the motility of instrument, provide the foundation for instrument miniaturization, facilitation development.
The present invention uses the dfb semiconductor infrared laser of centre wavelength 2334nm, high accuracy open long-optical path CO and CH developed4On-line monitoring instrument, has the most online non-cpntact measurement, simple to operate, the feature of linearity error, and its key index such as minimum detectable level, response time reaches or is better than same kind of products at abroad.
Accompanying drawing illustrates:
Fig. 1 is principle of the invention figure；
Fig. 2 is the pictorial diagram of the present invention；
Fig. 3 is the instrumentation plan of the present invention；
Fig. 4 is the gas calibration schematic diagram of the present invention；
Wherein, 1, laser instrument, 4 off-axis parabolic mirrors, 5 wedge shape windows one, 6 wedge shape windows two, 7 corner reflectors, detector 3, gas pond 8 and reflecting mirror 9；
Fig. 5 is the workflow diagram of the present invention；
Fig. 6 is the monitor software interface on the host computer of the present invention；
Fig. 7 is the monitor software workflow figure on the host computer of the present invention.
Detailed description of the invention
As it is shown in figure 1, a kind of open long-optical path CO and CH4Monitoring instrument, including mainframe box and open long-optical path light path, near-infrared DFB semiconductor laser and corresponding laser circuit control and temperature control modules that centre wavelength is 2344mm are installed in described mainframe box, and control with described laser diode current and signal generating circuit that temperature control modules electrically connects, the outfan of described laser temperature control module is electrically connected with the input of the temperature control end of described DFB semiconductor laser, the outfan of described signal generating circuit and described laser diode current control and the input of temperature control modules is electrically connected；The input of described signal generating circuit is connected with electronic hardware control circuit plate, it is also equipped with off axis paraboloidal mirror in described mainframe box, adjustable gas pond, position is installed in the described light path between near-infrared DFB semiconductor laser and described off axis paraboloid mirror, the adjustable photodetector in position is installed in described off axis paraboloid mirror mirror foci, using DFB near-infrared semiconductor laser output center wavelength be tuned to 2344nm as CO and CH4Detection LASER Light Source, simultaneously, the saw wave modulator Signal averaging of the 500Hz produced by signal generating circuit controls and on temperature control modules at the laser diode current of laser instrument, it is collimation laser that the laser of the 2344nm wavelength of described DFB near-infrared semiconductor laser is reflected formula fiber optic collimator bonder, and described collimation laser enters open long-optical path light path to CO and CH in open long-optical path light path through the centre bore of off axis paraboloidal mirror4Gas carries out the scanning of absorption spectrum, and the angle transmitting mirror reflection tailing edge original optical path being opened formula long light path light path returns, the laser reflected is gathered on photodetector by the off axis paraboloidal mirror in mainframe box, photodetector optical fiber connects signal conditioning circuit, signal conditioning circuit electrical connection electronic hardware control circuit, data communication between described electronic hardware panel circuit and host computer；Described electronic hardware circuitry is based on single-chip microcomputer, and described single-chip microcomputer combines the calculating of multispectral fitting algorithm and is finally inversed by CO and CH4The post concentration of gas, display management on the open long-optical path gas monitoring instrument online-monitoring software of host computer independent research.
It is illustrated in figure 2 the overall diagram for instrument, including adjusting pole and be arranged on mainframe box on adjusting pole, described mainframe box uses polygonal outer shape structure, described mainframe box has upper cover, lower cover, front panel, rear board to be spliced, front and back panel uses 10mm thickness aluminium sheet turnning and milling, and upper and lower cover plates is formed by 2mm thickness sheet metal component bending.Upper cover plate forward position is done anti-veiling glare and is processed, and telescope is fixed on directly over instrument, is used for regulating light path.On described front panel, installing quartz glass window, window angle of inclination is 8 °；It is also equipped with rear board on described rear board and on and off switch, serial communication interface, and power supply input adapter are installed；Along described from paraboloidal mirror light path major axes orientation, internal one diameter of fixed installation, slightly larger than the sleeve from paraboloidal mirror optic diameter, surface blackening, eliminates the veiling glare impact on optical system；Described adjustment frame can carry out the regulation of level angle and pitching；Described gas pond and the adjustable bracing frame covered that is threadably mounted at down by it of photoelectric probe position are realized；Described mainframe box is fixed on the light path telescope of regulation.Connect in the middle of described rear board and have the connecting rod extending in mainframe box, on position level with connecting rod, also it is disposed with reflection type optical fiber collimation bonder, off axis paraboloidal mirror, described reflection type optical fiber collimation bonder and off axis paraboloidal mirror have the bracing frame connecting lower cover to support respectively, the dfb semiconductor infrared laser of centre wavelength 2334nm, and current control module and signal generating circuit accordingly it is additionally provided with in described mainframe box；Also include the corner reflector corresponding with off axis paraboloidal mirror axial principal ray；And the photodetector of off axis paraboloidal mirror obliquely downward；Described off axis paraboloidal mirror center offers laser and passes through hole；The focal length of the reflecting mirror of described reflection type optical fiber bonder keeps constant in a wide wave-length coverage.
As shown in Figure 3, when measuring, the laser that laser instrument is launched collimates bonder through fiber-optic transfer to reflection type optical fiber, laser after collimation sequentially passes through the centre bore of off-axis parabolic mirror, wedge shape window one, air, wedge shape window two is to corner reflector, again through wedge shape window two after corner reflector reflects, air, wedge shape window one to off-axis parabolic mirror, reflexed to detector by off-axis parabolic mirror again and carry out the collection of optical signal, wherein, with laser instrument main optical path out of plumb when wedge shape window one and wedge shape window two are installed, but become an angle being not equal to 90 degree, detector scalable.
As shown in Figure 4, when calibration, gas pond and reflecting mirror are raised on the main optical path at laser place automatically, as it can be seen, its operation principle is: the laser that laser instrument is launched collimates bonder through fiber-optic transfer to reflection type optical fiber, the laser after collimation is through being connected with the gas pond of gas, again to reflecting mirror after the centre bore of off-axis parabolic mirror, again by reflecting mirror by luminous reflectance to detector, carry out the detection of optical signal, reflecting mirror 9 and the equal scalable of detector 3.
Described electronic hardware panel circuit is by using chip microcontroller, as mentioned Single Chip Microcomputer (SCM) program can realize control produce modulated signal, gather conditioning after signal, carry out line shape fitting each post concentration, to host computer transmit information the big function of calculating four, have the open long-optical path gas monitoring instrument online-monitoring software of independent research on described host computer, it is achieved gather data system self-inspection, gather, process, show, data management function；
Wherein, electronic hardware circuitry plate control signal generation circuit produces the sweep waveform signal of laser instrument, produce is the sawtooth waveforms of about 500Hz, this sawtooth signal is loaded on laser circuit and temperature control modules, realize amplitude and the offset adjusted of waveform, to obtain suitable laser scans wave-length coverage.The current module control accuracy selected is 0.1%, and temperature control precision is 0.01 DEG C, meets the required precision needed for retrieving concentration.
Described data acquisition module uses DMA mode, alleviate single-chip microcomputer computing pressure, it is allowed to more multi-capacity and carries out the matching of spectrum, the signal conditioning circuit that described data acquisition circuit connects is integrated low noise circuit, it is achieved the light current of detector flows to the functions such as conversion and the signal filtering conditioning of voltage.
The described data communication unit in single-chip microcomputer will process after data according to certain protocol format (#CO concentration value | CH4Concentration value | light intensity value |), USB line it is passed directly to host computer.
Being illustrated in figure 5, workflow diagram of the present invention, start, run the laser to Wavelength stabilized, start data acquisition and process and conveying, until completing to measure, closing laser instrument and mutually powered-down for equipment.
Be illustrated in figure 6 the interface of open long-optical path CO monitor online-monitoring software, this software can complete the data system self-inspection to CO monitor, gather, process, show, data management function.
Fig. 7 is open long-optical path CO monitor online-monitoring software flow chart.
Claims (2)
1. open long-optical path CO and CH4Monitoring instrument, including mainframe box and open long-optical path light path, near-infrared DFB semiconductor laser and corresponding laser diode current control and temperature control modules that centre wavelength is 2344mm are installed in described mainframe box, it is also equipped with signal generating circuit, the outfan of described laser temperature control module is electrically connected with the input of the temperature control end of described DFB semiconductor laser, and the outfan of described signal generating circuit and described laser diode current control and the input of temperature control modules is electrically connected；The input of described signal generating circuit is connected with electronic hardware control circuit, it is characterized in that: in described mainframe box, be also equipped with off axis paraboloidal mirror, position height adjustable gas pond is installed in the light path between described near-infrared DFB semiconductor laser and described off axis paraboloid mirror, the adjustable photodetector of position height is installed, using DFB near-infrared semiconductor laser Output of laser center wavelength tuning to 2344nm as CO and CH in described off axis paraboloid mirror mirror foci4Detection LASER Light Source, simultaneously, the modulated signal that signal generating circuit produces is superimposed upon laser diode current control and on temperature control modules, the laser of the 2344nm wavelength of described DFB near-infrared semiconductor laser is reflected formula fiber optic collimator bonder and is coupled as collimation laser, described collimation laser enters open long-optical path light path through the centre bore of off axis paraboloidal mirror, and the angle transmitting mirror reflection tailing edge original optical path being opened formula long light path light path returns, it is thus achieved that CO and CH4The absorption spectrum information of gas, the laser reflected is gathered on photodetector by the off axis paraboloidal mirror in mainframe box, photodetector optical fiber connects signal conditioning circuit, signal conditioning circuit electrical connection electronic hardware control circuit, carries out data communication between described electronic hardware control circuit and host computer；Described electronic hardware control circuit is based on single-chip microcomputer, and described single-chip microcomputer combines multispectral fitting algorithm and calculates CO and CH4The absorption spectrum information of gas is finally inversed by CO and CH4The post concentration of gas, display management on the open long-optical path gas monitoring instrument online-monitoring software of host computer；
Described mainframe box has upper cover, lower cover, front panel, rear board, connect in the middle of described rear board and have the connecting rod extending in mainframe box, described reflection type optical fiber collimation bonder, off axis paraboloidal mirror are all and connecting rod keeps sustained height, the adjustable reflecting mirror of position height one it is provided with after described off axis paraboloid mirror, when gas pond works, described gas pond and reflecting mirror one position adjustments and connecting rod sustained height, be respectively positioned on laser main optical path；The data communications equipment being connected it is additionally provided with between power supply, on and off switch and electronic hardware panel and host computer on described mainframe box.
A kind of open long-optical path CO and CH the most according to claim 14Monitoring instrument, it is characterized in that: described open long-optical path optical routing wedge shape window one, wedge shape window two and corner reflector are constituted, described wedge shape window one is arranged on described mainframe box laser emitting window, described wedge shape window two is arranged on corner reflector front end, described wedge shape window one, wedge shape window two and corner reflector all on the main optical path of laser, described wedge shape window one, wedge shape window two and laser main optical path out of plumb.
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| CN104596987A (en) * | 2015-02-03 | 2015-05-06 | 中国科学院合肥物质科学研究院 | Mid-infrared spectroscopy-based trace gas detection method and device combining long-optical-path open light path with wavelength modulation technique |
| CN104729996B (en) * | 2015-04-17 | 2017-10-31 | 江苏天瑞仪器股份有限公司 | Reflective laser on-line gas analysis instrument light path device |
| CN106018339B (en) * | 2016-07-08 | 2018-09-07 | 山东微感光电子有限公司 | Adaptive reflective infrared laser industrial hazard gas leakage monitoring device |
| CN106370601B (en) * | 2016-08-17 | 2019-12-06 | 北京千安哲信息技术有限公司 | Gaseous wide area detection device |
| CN108020528A (en) * | 2017-12-14 | 2018-05-11 | 北京航天易联科技发展有限公司 | A kind of laser-correlation device for realizing multi-method measurement |
| CN109001154B (en) * | 2018-06-13 | 2021-04-09 | 湖州师范学院 | Efficient seed vigor measuring system based on laser absorption spectrum technology |
| CN109030363A (en) * | 2018-08-17 | 2018-12-18 | 杭州因诺维新科技有限公司 | A kind of laser gas analyzer |
| CN109856078B (en) * | 2019-01-16 | 2022-12-23 | 深圳供电局有限公司 | Optical gas detection system |
| CN110907395A (en) * | 2019-12-02 | 2020-03-24 | 光钙(上海)高科技有限公司 | Direct absorption type TDLAS gas analyzer and method |
| CN113189039B (en) * | 2021-04-02 | 2023-04-07 | 应急管理部天津消防研究所 | Multi-phase state hazardous chemical substance three-dimensional detection system and method |
| CN114112963A (en) * | 2021-11-30 | 2022-03-01 | 青岛崂应海纳光电环保集团有限公司 | Gas telemetering telescope |
| CN114460037A (en) * | 2021-12-31 | 2022-05-10 | 中船重工安谱（湖北）仪器有限公司 | Ammonia gas mass laser remote measuring device |
| CN115372313A (en) * | 2022-10-21 | 2022-11-22 | 合肥金星智控科技股份有限公司 | Detection light path and detection system based on TDLAS technology |
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| CN103411919A (en) * | 2013-07-03 | 2013-11-27 | 安徽建筑大学 | System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases |
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