CN104132911A - 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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- CN104132911A CN104132911A CN201410380325.7A CN201410380325A CN104132911A CN 104132911 A CN104132911 A CN 104132911A CN 201410380325 A CN201410380325 A CN 201410380325A CN 104132911 A CN104132911 A CN 104132911A
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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 the open long-optical path on-line detector device of a kind of atmospheric environment gas CO and CH4.
background technology:
Along with the quickening of modern society's rhythm of life, air environmental pollution is more and more serious, and the CO that wherein derives from coal-fired and motor-vehicle tail-gas is one of important pollutant of atmosphere, is the important tracer that research pollutant transforms, carries and distributes in atmosphere; Although CO itself is not the direct contributor of greenhouse effect, but CONCENTRATION DISTRIBUTION and variation that the Control of chemical reaction of it and OH free radical other greenhouse gases such as CO2, CH4, O3, methane (CH4) is the greenhouse gases that atmospheric level is only second to CO2, belong to hydrocarbon, chemical property is more stable, can absorb consumingly earth long-wave radiation and tool greenhouse effect, and then global climate is produced to significant impact, so the observational study work of Atmospheric CO and CH4 concentration is very necessary.
The method of carrying out at home gas detection at present is mainly divided into electricity formula gas detection method, optical type gas detection method, electrochemical gas detection method, vapor-phase chromatography and macromolecular material gas detection method etc.
Electricity formula gas detection method is by detecting the variation of the electrical properties relevant with gas concentration, to know the concentration of gas.
Optical type gas detection method is by the measurement to the optical characteristics of gas, differentiate gas and detect its concentration, according to the difference of utilized optical property, the gas sensor of this class optical method is broadly divided into spectral absorption type, photoionization type, light interference type, fluorescent type and chemiluminescence formula etc.
It is to differentiate and analyze its concentration according to the characteristic absorption spectrum of gas that wherein spectral absorption type gas detects, its principle is: the characteristic absorption spectrum of gas with various is different, and various gas becomes certain relation in the absorbance of different separately characteristic absorption spectrums and the concentration of gas, when having irradiation to be filled with the air chamber of tested gas, the gas composition that optical source wavelength is in its characteristic wave strong point absorbs a part of light, and the relation between incident intensity, reflective light intensity and characteristic wavelength gas composition is followed Lambert-Beer law.The development trend of spectral absorption formula gas sensor is just towards intelligent, practical, market-oriented future development.
Traditional electrical chemical sensor can be divided into three types: MOS type, galvanochemistry solid electrolyte type and galvanochemistry solid macromolecular electrolyte type etc.Their shortcoming is that output signal and gas volume fraction are linear relationship; Be not suitable for being used in the gas detection 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, vapor-phase chromatography principle that Here it is.
Non-optical class gas sensor all has poor stability, easily poisoning, detection need to be sampled and pretreated shortcoming, real-time and accuracy that system detects have been reduced, and interference component is a lot, sometimes intersect to disturb and cannot avoid at all, be difficult to accomplish on-line monitoring, system maintenance is more complicated also.
Compare optical method detection gas concentration with non-optical method and there are many advantages, as reached remote Measurement accuracy and on-line monitoring, system stability, be difficult for being interfered, highly sensitive, responsiveness is fast, safe and reliable, high temperature resistant, corrosion-resistant, and maintenance workload is little etc.Particularly the gas sensor based on gas near-infrared spectrum absorption techniques can be realized the high sensitivity fast detecting to gas, except above-mentioned advantage also selective strong, long service life, demarcation is simple, cost is low, be easy to the advantages such as realization.
Although abroad, for research and the application of gas detection technology, some developed country's startings relatively early, have worked out a lot of gas detection methods, and have had some to be applied in practice.But consider domestic gas concentration detector market at present, all that some external products are occupied, although highly sensitive, fast response time, can monitor continuously, safe and reliable, prices are rather stiff for it, researches and develops at home gas detecting instrument or imperative.
Open long-optical path CO and CH4 on-line monitoring instrument are exactly based on tunable semiconductor laser spectrum tech (TDLAS), and the analytical instrument of contactless online auto monitoring atmosphere pollution CO and CH4 has the features such as real-time online, monitoring simultaneously.
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 CH4 monitoring instrument, long light path absorption spectroscopy techniques based on open light path, adopt tunable diode laser absorption spectroscopy technology and Distributed Feedback Laser wavelength locking technology, utilize a laser instrument all band scanning CO, two kinds of gas absorption of CH4, by the absorption spectrum of CO and CH4 gas molecule being carried out to the qualitative or quantitative test of multi-parameter fitting algorithm realization to object gas.
The technical solution adopted in the present invention is as follows:
A kind of open long-optical path CO and CH4 monitoring instrument, comprise mainframe box and open long-optical path light path, it is near infrared dfb semiconductor laser instrument and corresponding laser diode current control and the temperature control modules of 2344mm that centre wavelength is installed in described mainframe box, signal generating circuit is also installed, the output terminal of described laser temperature control module is connected with the input end electricity of the temperature control end of described dfb semiconductor laser instrument, and the output terminal of described signal generating circuit is controlled with the input end electricity of temperature control modules and is connected with described laser diode current, the input end of described signal generating circuit is connected with electronic hardware control circuit, off axis paraboloidal mirror is also installed in described mainframe box, the adjustable gas pond of position height is installed in the light path between described near infrared dfb semiconductor laser instrument 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 with CH in described off axis paraboloid mirror mirror foci
4detection laser light source, simultaneously, the modulation signal that signal generating circuit is produced is superimposed upon on laser diode current control and temperature control modules, the laser of the 2344nm wavelength of described DFB near infrared semiconductor laser transmitting is coupled as collimation laser through reflection type optical fiber collimation coupling mechanism, described collimation laser enters open long-optical path light path through the center pit of off axis paraboloidal mirror, and along original optical path, returned after the angle transmitting mirror reflection of open long-optical path light path, obtain the absorption spectrum information of CO and CH4 gas, the laser reflecting is gathered on photodetector by the off axis paraboloidal mirror in mainframe box, photodetector optical fiber connects signal conditioning circuit, signal conditioning circuit is electrically connected to 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 the absorption spectrum information that described single-chip microcomputer calculates CO and CH4 gas in conjunction with multispectral fitting algorithm is finally inversed by CO and CH
4the post concentration of gas, display management on the open long-optical path gas monitoring instrument on-line monitoring software of host computer.
Described mainframe box comprises that upper cover, lower cover, front panel, rear panel form, in the middle of described rear panel, be connected with the connecting link extending in mainframe box, described reflection type optical fiber collimation coupling mechanism, off axis paraboloidal mirror, all with connecting link co-altitude, position adjustments and connecting link co-altitude during the work of described gas pond; On described mainframe box, be also provided with power supply, power switch and and host computer between the serial ports that connects.On described front panel, wedge shape window one is installed, wedge shape window one angle of inclination is 8 °; Rear panel is also installed on described rear panel power switch, serial communication interface, and power supply input adapter are installed; Along described from paraboloidal mirror light path major axes orientation, a slightly larger in diameter of inner fixed installation is in the sleeve from paraboloidal mirror optic diameter, surface blackening; Described adjustment rack can carry out the adjusting of level angle and pitching; Described gas pond and photoelectric probe position are adjustable to be arranged on down by its screw thread the bracing frame covering and to realize; Above described mainframe box, be fixed with the telescopic system that regulates light path, described reflection type optical fiber collimates coupling mechanism and on off axis paraboloidal mirror, has respectively the bracing frame that is connected lower cover to support.
Described open long-optical path optical routing wedge shape window one, wedge shape window two and corner reflector form, 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 of laser instrument transmitting collimates coupling mechanism through Optical Fiber Transmission to reflection type optical fiber, laser after collimation arrives corner reflector through center pit, wedge shape window one, atmosphere, the wedge shape window two of off-axis parabolic mirror successively, again after corner reflector reflection through wedge shape window two, atmosphere, wedge shape window one to off-axis parabolic mirror, then reflex to by off-axis parabolic mirror the collection that detector carries out light signal.
After described off axis paraboloid mirror, be provided with the adjustable catoptron of position height one, when calibration, gas pond and catoptron are raised on the main optical path at laser place automatically, the laser of laser instrument transmitting collimates coupling mechanism through Optical Fiber Transmission to reflection type optical fiber, laser after collimation is through being connected with the gas pond of gas, then after the center pit of off-axis parabolic mirror to catoptron, then by catoptron, light is reflexed on detector, carry out the detection of light signal, catoptron and detector are all adjustable.
Described electronic hardware control panel circuit is by adopting chip microcontroller, described Single Chip Microcomputer (SCM) program can realize to host computer and transmit information, controls the signal producing after modulation signal, collection conditioning, the large function of calculating four of carrying out each post concentration of line shape fitting, on described host computer, there is the open long-optical path gas monitoring instrument on-line monitoring software of independent research, realize image data System self-test, collection, processing, demonstration, data management function;
The design concept of native system is:
The core technology of native system is based on tunable diode laser absorption spectroscopy (TDLAS) technology, utilize in air and open long light path CO in the absorption of infrared visible waveband (2334nm), characteristic absorption line in conjunction with CH4 gas molecule under this laser scanning frequency, adopt spectrum simulation algorithm, obtain the absorbance of CO and two kinds of gas molecules of CH4, carry out again Inversion Calculation, the post concentration that obtains airborne CO and two kinds of gases of CH4, outputs to host computer by post concentration results and light intensity parameter by serial ports in real time.
Native system adopts the LASER Light Source with the infrared visible waveband of transmitting (2334nm), the laser that LASER Light Source is launched transfers to angle mirror after the absorption in open long light path atmosphere, the optical system that enters instrument after described angle mirror reflection laser, by the focusing of instrumental optics system, enter detector, described detector transfers spectral signal electric signal to and carries out the conditioning of signal, after digitizing, the absorbance that just can obtain CO and CH4 gas under this opening light path through inverting, after analyzing, calculates post concentration and passes to host computer.
(1) the long light path absorption spectroscopy techniques based on open light path.According to Beer-Lambert absorption law, know, the detection sensitivity of system is relevant with light path L, and light path is longer, and the sensitivity of detection is higher.Open light path can obtain dusty gas concentration on a large scale, so reduced the impact of local concentration fluctuation; Long light path absorption spectroscopy techniques absorbs light path by increase, thereby has improved 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, can increase substantially the stability of DFB laser wavelength.
(3) the multi-parameter fitting technology based on spectrum.Multi-parameter fitting technology based on CO and CH4 gas molecule absorption spectrum, lorentzian curve matching CO absorption peak and a plurality of CH4 absorption peak have been adopted, algorithm is used a plurality of parameters to carry out the matching of spectrum, make very stable of algorithm itself, revise the impact of temperature and air pressure, greatly improved precision and the resolution of gas absorption spectra.
Beneficial effect of the present invention is embodied in:
(1) Closed loop Control based on DFB laser wavelength lock current and temperature, adopt a laser instrument all band can scan CO, two kinds of gas absorption of CH4, and adopt open light path to detect, there is higher sensitivity and resolution, be suitable for the on-line monitoring of CO and CH4 in conventional air quality.
(2) in conjunction with many light fitting algorithm, to CO and CH
4absorption spectrum carries out multi-parameter fitting, and then calculating is finally inversed by CO and CH
4post concentration, have the advantages that selectivity is good, highly sensitive, precision is high.
(3) adopt adjustable gas pond, photodetector and the catoptron in control position, increased the dirigibility of instrument, for instrument miniaturization, facilitation development provide the foundation.
The present invention adopts the dfb semiconductor infrared laser of centre wavelength 2334nm, the high precision open long-optical path CO having developed and CH4 on-line monitoring instrument, the feature with quick online non-cpntact measurement, simple to operate, linear error, the key indexs such as its minimum detectable level, response time reach or are better than same kind of products at abroad.
accompanying drawing explanation:
Fig. 1 is principle of the invention figure;
Fig. 2 is pictorial diagram of the present invention;
Fig. 3 is instrumentation plan of the present invention;
Fig. 4 is gas calibration schematic diagram of the present invention;
Wherein, 1, laser instrument, 4 off-axis parabolic mirrors, 5 wedge shape window one, 6 wedge shape window two, 7 corner reflectors, detector 3, gas pond 8 and catoptron 9;
Fig. 5 is workflow diagram of the present invention;
Fig. 6 is the monitor software interface on host computer of the present invention;
Fig. 7 is the monitor software workflow figure on host computer of the present invention.
Embodiment
As shown in Figure 1, a kind of open long-optical path CO and CH4 monitoring instrument, comprise mainframe box and open long-optical path light path, it is near infrared dfb semiconductor laser instrument and corresponding laser circuit control and the temperature control modules of 2344mm that centre wavelength is installed in described mainframe box, and with described laser diode current is controlled and temperature control modules is electrically connected to signal generating circuit, the output terminal of described laser temperature control module is connected with the input end electricity of the temperature control end of described dfb semiconductor laser instrument, the output terminal of described signal generating circuit is controlled with the input end electricity of temperature control modules and is connected with described laser diode current, the input end of described signal generating circuit is connected with electronic hardware control circuit board, off axis paraboloidal mirror is also installed in described mainframe box, adjustable gas pond, position is installed in the light path between described near infrared dfb semiconductor laser instrument 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 CH
4detection laser light source, simultaneously, the saw wave modulator signal of the 500Hz that signal generating circuit is produced is superimposed upon in the laser diode current control and temperature control modules of laser instrument, the laser of the 2344nm wavelength of described DFB near infrared semiconductor laser transmitting is collimation laser through reflection type optical fiber collimation coupling mechanism, described collimation laser enters open long-optical path light path through the center pit of off axis paraboloidal mirror the CO in open long optical-path light-path and CH4 gas is carried out to the scanning of absorption spectrum, and along original optical path, returned after the angle transmitting mirror reflection of open long-optical path light path, the laser reflecting is gathered on photodetector by the off axis paraboloidal mirror in mainframe box, photodetector optical fiber connects signal conditioning circuit, signal conditioning circuit is electrically connected to electronic hardware control circuit, data communication between described electronic hardware control panel circuit and host computer, described electronic hardware circuit is based on single-chip microcomputer, and described single-chip microcomputer calculates the post concentration that is finally inversed by CO and CH4 gas, display management on the open long-optical path gas monitoring instrument on-line monitoring software of host computer independent research in conjunction with multispectral fitting algorithm.
Be illustrated in figure 2 the overall diagram for instrument, comprise adjusting pole and be arranged on mainframe box on adjusting pole, described mainframe box adopts polygonal outer shape structure, described mainframe box has upper cover, lower cover, front panel, rear panel to be spliced, front and back panel adopts the thick aluminium sheet turnning and milling of 10mm, and upper and lower cover plates is formed by the thick sheet metal component bending of 2mm.Upper cover plate forward position is done anti-parasitic light and is processed, and telescope is fixed on directly over instrument, for regulating light path.On described front panel, quartz glass window is installed, window angle of inclination is 8 °; Rear panel is also installed on described rear panel power switch, serial communication interface, and power supply input adapter are installed; Along described from paraboloidal mirror light path major axes orientation, a slightly larger in diameter of inner fixed installation is in the sleeve from paraboloidal mirror optic diameter, and surface blackening, eliminates the impact of parasitic light on optical system; Described adjustment rack can carry out the adjusting of level angle and pitching; Described gas pond and photoelectric probe position are adjustable to be arranged on down by its screw thread the bracing frame covering and to realize; Above described mainframe box, be fixed with the light path telescope of adjusting.In the middle of described rear panel, be connected with the connecting link extending in mainframe box, on the level position of connecting link, also be disposed with reflection type optical fiber collimation coupling mechanism, off axis paraboloidal mirror, described reflection type optical fiber collimation coupling mechanism has respectively the bracing frame that is connected lower cover to support with off axis paraboloidal mirror, in described mainframe box, be also provided with the dfb semiconductor infrared laser of centre wavelength 2334nm, and corresponding current control module and signal generating circuit; Also comprise the corner reflector corresponding with off axis paraboloidal mirror axial principal ray; And the photodetector of the oblique below of off axis paraboloidal mirror; Described off axis paraboloidal mirror center offers laser and passes through hole; The focal length of the catoptron of described reflection type optical fiber coupling mechanism remains unchanged in a wide wavelength coverage.
As shown in Figure 3, when measuring, the laser of laser instrument transmitting collimates coupling mechanism through Optical Fiber Transmission to reflection type optical fiber, laser after collimation passes through the center pit of off-axis parabolic mirror successively, wedge shape window one, atmosphere, wedge shape window two is to corner reflector, again after corner reflector reflection through wedge shape window two, atmosphere, wedge shape window one is to off-axis parabolic mirror, by off-axis parabolic mirror, reflex to the collection that detector carries out light signal again, wherein, when wedge shape window one and wedge shape window two installed and laser instrument main optical path out of plumb, but become an angle that is not equal to 90 degree, detector is adjustable.
As shown in Figure 4, when calibration, gas pond and catoptron are raised on the main optical path at laser place automatically, as shown in the figure, its principle of work is: the laser of laser instrument transmitting collimates coupling mechanism through Optical Fiber Transmission to reflection type optical fiber, and the laser after collimation is through being connected with the gas pond of gas, again after the center pit of off-axis parabolic mirror to catoptron, by catoptron, light is reflexed on detector, carry out the detection of light signal, catoptron 9 and detector 3 are all adjustable.
Described electronic hardware control panel circuit is by adopting chip microcontroller, as as described in Single Chip Microcomputer (SCM) program can realize and control to produce modulation signal, gather signal after conditioning, carry out each post concentration of line shape fitting, to host computer, transmit the large function of calculating four of information, on described host computer, there is the open long-optical path gas monitoring instrument on-line monitoring software of independent research, realize image data System self-test, collection, processing, demonstration, data management function;
Wherein, electronic hardware circuit board control signal circuit for generating produces the sweep waveform signal of laser instrument, what produce is the sawtooth wave 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 wavelength coverage.The current module control accuracy of selecting is 0.1%, and temperature control precision is 0.01 ℃, meets the required accuracy requirement of retrieving concentration.
Described data acquisition module adopts DMA pattern, alleviated single-chip microcomputer computing pressure, make it more multi-capacity and carry out the matching of spectrum, the signal conditioning circuit that described data acquisition circuit connects is integrated low noise circuit, and the light current of realizing detector flows to the functions such as the conversion of voltage and signal filtering conditioning.
Data communication unit in described single-chip microcomputer by the data after processing according to certain protocol format (#CO concentration value | CH4 concentration value | light intensity value |), by USB line, directly pass to host computer.
Be illustrated in figure 5, workflow diagram of the present invention, start, runs the laser to Wavelength stabilizedly, starts data acquisition and processing and conveying, until complete measurement, closes laser instrument and associated electrical for equipment.
The interface that is illustrated in figure 6 open long-optical path CO monitor on-line monitoring software, this software can complete data system self check, collection, processing, demonstration, the data management function to CO monitor.
Fig. 7 is open long-optical path CO monitor on-line monitoring software flow pattern.
Claims (3)
1. an open long-optical path CO and CH4 monitoring instrument, comprise mainframe box and open long-optical path light path, it is near infrared dfb semiconductor laser instrument and corresponding laser diode current control and the temperature control modules of 2344mm that centre wavelength is installed in described mainframe box, signal generating circuit is also installed, the output terminal of described laser temperature control module is connected with the input end electricity of the temperature control end of described dfb semiconductor laser instrument, and the output terminal of described signal generating circuit is controlled with the input end electricity of temperature control modules and is connected with described laser diode current, the input end of described signal generating circuit is connected with electronic hardware control circuit, it is characterized in that: off axis paraboloidal mirror is also installed in described mainframe box, the adjustable gas pond of position height is installed in the light path between described near infrared dfb semiconductor laser instrument 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 with CH in described off axis paraboloid mirror mirror foci
4detection laser light source, simultaneously, the modulation signal that signal generating circuit is produced is superimposed upon on laser diode current control and temperature control modules, the laser of the 2344nm wavelength of described DFB near infrared semiconductor laser transmitting is coupled as collimation laser through reflection type optical fiber collimation coupling mechanism, described collimation laser enters open long-optical path light path through the center pit of off axis paraboloidal mirror, and along original optical path, returned after the angle transmitting mirror reflection of open long-optical path light path, obtain the absorption spectrum information of CO and CH4 gas, the laser reflecting is gathered on photodetector by the off axis paraboloidal mirror in mainframe box, photodetector optical fiber connects signal conditioning circuit, signal conditioning circuit is electrically connected to electronic hardware control circuit, between described electronic hardware control circuit and host computer, carry out data communication, described electronic hardware control circuit is based on single-chip microcomputer, and the absorption spectrum information that described single-chip microcomputer calculates CO and CH4 gas in conjunction with multispectral fitting algorithm is finally inversed by CO and CH
4the post concentration of gas, display management on the open long-optical path gas monitoring instrument on-line monitoring software of host computer.
2. a kind of open long-optical path CO according to claim 1 and CH4 monitoring instrument, it is characterized in that: described open long-optical path optical routing wedge shape window one, wedge shape window two and corner reflector form, 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.
3. a kind of open long-optical path CO according to claim 1 and CH4 monitoring instrument, it is characterized in that: described mainframe box is by upper cover, lower cover, front panel, rear panel, in the middle of described rear panel, be connected with the connecting link extending in mainframe box, described reflection type optical fiber collimates coupling mechanism, off axis paraboloidal mirror all and connecting link keeps sustained height, after described off axis paraboloid mirror, be provided with the adjustable catoptron of position height one, when work in gas pond, described gas pond and catoptron one position adjustments and connecting link sustained height, be all positioned on laser main optical path; On described mainframe box, be also provided with the data communication being connected between power supply, power switch and electronic hardware control panel and host computer.
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| CN109856078A (en) * | 2019-01-16 | 2019-06-07 | 深圳供电局有限公司 | Optical gas detection system |
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| CN113189039A (en) * | 2021-04-02 | 2021-07-30 | 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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