CN204359458U - Based on the TDLAS gas thermometric pick-up unit of optical spectroscopic system - Google Patents
Based on the TDLAS gas thermometric pick-up unit of optical spectroscopic system Download PDFInfo
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- CN204359458U CN204359458U CN201420617030.2U CN201420617030U CN204359458U CN 204359458 U CN204359458 U CN 204359458U CN 201420617030 U CN201420617030 U CN 201420617030U CN 204359458 U CN204359458 U CN 204359458U
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Abstract
The utility model belongs to technical field of optical detection, is specifically related to a kind of TDLAS gas thermometric pick-up unit based on optical spectroscopic system.The program adopts high energy semiconductor tunable laser instrument as work light, laser instrument detects at specific fluctuation variable ratio frequency changer, investigative range is accurately wider, after optical fiber collimator injection directional light light, assemble through lens through combustion field light beam, utilize optical grating beam splitting system to carry out accurate light splitting, the laser beam separated focuses on through lens reflection by the program, more can improve the focus energy of light signal, then detect the temperature of combustion flame field to be measured gas.Wherein, after grating beam splitting, wavelength unicity is better, and image patch focus energy is comparatively strong, and light signal energy free of losses after secondary focusing after light splitting, high to measurement result degree of accuracy, dissipate energy is less, and system building is simple and easy, easy and simple to handle.Be applicable to commercial production detect.
Description
Technical field
The utility model belongs to technical field of optical detection, is specifically related to a kind of TDLAS gas thermometric pick-up unit based on optical spectroscopic system.
Background technology
Along with the reach of science, the progress of scientific and technological level, in social production process, Product checking technology is improved constantly, by the detection means iterative method of original engineering properties to the detection means of photoelectric technology, wherein gas detect is the most perspective, the detection means with marketable value instantly, real-time control measurement is carried out to the temperature in gaseous combustion and content, is mainly used in the temperature detection of industrial miniaturization production, through engineering approaches equipment, as steel plant, incineration plant, boiler factory etc.Original mechanical measurement temperature device index is lower, and degree of accuracy is low, and measurement range is little, can not meet industrialized high-temperature service requirement.And for photoelectric detecting technology, its laser detection precision is high, error is little, and system building is simple and easy, easy and simple to handle, substantially can meet commercial production and detect demand, and for the scheme that TDLAS gas thermometric detects, not occur the technical scheme of comparative maturity at present yet.
Utility model content
(1) technical matters that will solve
The technical problems to be solved in the utility model is: how to provide a kind of TDLAS gas thermometric detection technique scheme based on optical spectroscopic system.
(2) technical scheme
For solving the problems of the technologies described above, the utility model provides a kind of TDLAS gas thermometric pick-up unit based on optical spectroscopic system, and described device is divided into two parts centered by burning gases field; What be positioned at side, burning gases field is light source transmitting terminal, and what be positioned at burning gases field opposite side is light source receiving end;
Described light source transmitting terminal comprises: power supply, the first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4, single-mode fiber 13, optical-fiber bundling device 5, optical fiber collimator 6; Wherein, described first laser instrument 2a carries the first laser driver, and described second laser 2b carries the second laser driver;
Described light source receiving end comprises: the first plano-convex lens 8, fiber grating 9, second plano-concave lens 10a, the 3rd plano-concave lens 10b, the first photodetector, the second photodetector, the first photoelectric commutator 11a, the second photoelectric commutator 11b;
The electric source line interface of described first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4 is interconnected and unifies to be connected to the power supply interface power lead 2 of power supply; Described power supply is used for providing working power voltage for described first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4;
Described laser signal generator 3 connects the first laser driver, the second laser driver and laser signal debugger 4 respectively;
Described single-mode fiber 13 connects the first laser instrument 2a output port, second laser 2b output port and optical-fiber bundling device 5 input port respectively;
Described optical fiber collimator 6 is connected to optical-fiber bundling device 5 rear end, close after the two-beam fibre synthesis beam of laser after bundle through optical-fiber bundling device 5, connect and enter optical fiber collimator 6 front end, the laser beam sending miniature deformation through the refraction correction of collimation lens, sends collimated laser beam in optical fiber collimator 6 rear end in optical fiber collimator 6;
Described first plano-convex lens 8 is arranged in the opposite side of burning gases field relative to light source transmitting terminal, be positioned at the front end of light source receiving end, and be on the exit path of described optical fiber collimator 6, the first plano-convex lens 8 center and optical fiber collimator 6 center coaxial;
Described fiber grating 9 is positioned at the first plano-convex lens 8 rear end, and fiber grating 9 surface is in the focal position place of the first plano-convex lens 8, becomes certain steering angle with optical axis,
Described second plano-concave lens 10a, the 3rd plano-concave lens 10b are positioned at fiber grating 9 light splitting side, and described second plano-concave lens 10a, the 3rd plano-concave lens 10b are arranged at the optical axis place of separately laser beam separately, its position and respective optical axis center symmetry; Described second plano-concave lens 10a, the 3rd plano-concave lens 10b are placed on the laser beam optical axis center of each bundle different wave length that fiber grating 9 separates respectively, are connected with the optical axis spacial alignment of the laser beam of respective corresponding wavelength, and respective Central Symmetry;
Described first photodetector connects the second plano-concave lens 10a and is in its focal length place, and the first photodetector also connects the first photoelectric commutator 11a simultaneously; Second photodetector connects the 3rd plano-concave lens 10b and is in its focal length place, and the second photodetector also connects the second photoelectric commutator 11b simultaneously; Described first photodetector and the second photodetector are in as quick unit on the optical axis of each self-focusing of the laser beam of respective different wave length frequency.
(3) beneficial effect
Technical solutions of the utility model provide a kind of TDLAS gas thermometric detection technique scheme based on optical spectroscopic system, it adopts high energy semiconductor tunable laser instrument as work light, laser instrument detects at specific fluctuation variable ratio frequency changer, investigative range is accurately wider, after optical fiber collimator injection directional light light, assemble through lens through combustion field light beam, optical grating beam splitting system is utilized to carry out accurate light splitting, the laser beam separated focuses on through lens reflection by the program, more can improve the focus energy of light signal, then detect the temperature of combustion flame field to be measured gas.Wherein, after grating beam splitting, wavelength unicity is better, and image patch focus energy is comparatively strong, and light signal energy free of losses after secondary focusing after light splitting, high to measurement result degree of accuracy, dissipate energy is less, and system building is simple and easy, easy and simple to handle.Be applicable to commercial production detect.
Accompanying drawing explanation
Fig. 1 is the structural representation of technical solutions of the utility model.In figure,
1: power lead; 2a: the first laser instrument (band laser driver);
2b: second laser (band laser driver); 3: laser signal generator;
4: laser signal debugger; 5: laser bundling device; 6: optical fiber collimator;
7: combustion field gas; 8: the first plano-convex lenss; 9: fiber grating;
10a: the first plano-convex lens; 10b: the second plano-convex lens;
11a: the first photoelectric commutator; 11b: the second photoelectric commutator;
12: photoelectric transformer signal conversion line; 13: single-mode fiber.
Embodiment
For making the purpose of this utility model, content and advantage clearly, below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.
For solving the problem of prior art, the utility model provides a kind of TDLAS gas thermometric pick-up unit based on optical spectroscopic system, and as shown in Figure 1, described device is divided into two parts centered by burning gases field; What be positioned at side, burning gases field is light source transmitting terminal, and what be positioned at burning gases field opposite side is light source receiving end;
Described light source transmitting terminal comprises: power supply, the first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4, single-mode fiber 13, optical-fiber bundling device 5, optical fiber collimator 6; Wherein, described first laser instrument 2a carries the first laser driver, and described second laser 2b carries the second laser driver;
Described light source receiving end comprises: the first plano-convex lens 8, fiber grating 9, second plano-concave lens 10a, the 3rd plano-concave lens 10b, the first photodetector, the second photodetector, the first photoelectric commutator 11a, the second photoelectric commutator 11b;
The electric source line interface of described first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4 is interconnected and unifies to be connected to the power supply interface power lead 2 of power supply; Described power supply is used for providing working power voltage for described first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4; After power supply, described first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4 are opened;
Described laser signal generator 3 connects the first laser driver, the second laser driver and laser signal debugger 4 respectively;
Described laser signal generator 3 is for wavelength, the frequency attribute parameter intrinsic according to laser instrument, match settings detects the laser frequency reference value of gas relatively, generate initial laser signal generation instruction, drive the first laser instrument 2a and second laser 2b to generate initial laser beam to the first laser driver and the second laser driver;
The debugging of described laser signal debugger 4 for needing the laser wavelength range of emphasis collection to carry out loading sawtooth signal to the laser frequency near reference value and gas to be measured, the light signal that the laser beam after debugging is sent is consistent with during debugging; Then corrected signal is generated to laser signal generator 3; Described laser signal generator 3 generates according to corrected signal and revises rear laser signal generation instruction, drives the first laser instrument 2a and second laser 2b generated frequency, the revised laser beam of wavelength to the first laser driver and the second laser driver; Now the first laser instrument 2a and second laser 2b starts the laser sending required wavelength; Wherein, in the choosing of laser instrument, according to the wavelength spectral line scope of combustion field gas to be detected determine the work groundwork wave band of laser instrument, the laser instrument wherein chosen is consistent with detection gas wave band at groundwork wave band, wavelength domain of walker, a little more than containing wave band to be measured, more can expand the determination value range finding wavelength to be measured to float like this in signal tuning wavelength.Laser instrument is chosen for the laser instrument of two kinds of gas absorption wavelengths to be measured, and object determines temperature to the calculating of comparing of two-way laser signal;
Described single-mode fiber 13 connects the first laser instrument 2a output port, second laser 2b output port and optical-fiber bundling device 5 input port respectively; Described single-mode fiber 13 for Laser Transmission that described first laser instrument 2a and second laser 2b are exported to optical-fiber bundling device 5; Wherein, in the transmitting procedure of laser, using single mode fiber, and Optical Fiber Transmission type is transmitted with laser optical and is mated, single-mode fiber long transmission distance, stable signal transmission, decays lower slightly, meets needed for through engineering approaches;
Described optical-fiber bundling device 5 input port connects the single-mode fiber 13 that the first laser instrument 2a and second laser 2b transmits separately respectively; Described optical-fiber bundling device 5 closes bundle through front end for two-way single-mode fiber 13 being transmitted the laser that comes and is combined into the laser beam of a branch of two kinds of wavelength mode in rear end; The requirement of choosing of described optical-fiber bundling device can match with corresponding fiber type and can close bundle work;
Described optical fiber collimator 6 is connected to optical-fiber bundling device 5 rear end, close after the two-beam fibre synthesis beam of laser after bundle through optical-fiber bundling device 5, connect and enter optical fiber collimator 6 front end, the laser beam sending miniature deformation through the refraction correction of collimation lens, sends collimated laser beam in optical fiber collimator 6 rear end in optical fiber collimator 6; Described optical fiber collimator choose with corresponding conjunction number after fiber type match;
Described first plano-convex lens 8 is arranged in the opposite side of burning gases field relative to light source transmitting terminal, be positioned at the front end of light source receiving end, and be on the exit path of described optical fiber collimator 6, the first plano-convex lens 8 center and optical fiber collimator 6 center coaxial; The laser beam sent through optical fiber collimator 6 is entering in the first plano-convex lens 8 behind burning gases field, laser beam and the coaxial and rotational symmetry of the first plano-convex lens 8; Collimate parallel after laser beam can small deviation by light beam behind burning gases field, after the first plano-convex lens 8 refraction condensation, laser beam is converged again, surperficial to ensure that light beam enters fiber grating 9 with high-octane optical information; Described first plano-convex lens should choose low energy loss, and transmitance is higher, and size is mated with pick-up unit whole structure;
Described fiber grating 9 is positioned at the first plano-convex lens 8 rear end, and fiber grating 9 surface is in the focal position place of the first plano-convex lens 8, certain steering angle is become with optical axis, described fiber grating 9 is for the laser beam of the respective wavelength of two bundles after point folding bundle, and the angle value that its deflection angle and light beam separate matches; Through the conjunction Shu Jiguang of the first plano-convex lens 8 at the first plano-convex lens 8 optical axis focal point, and be transmitted through fiber grating 9 surface, the laser beam of closing after bundle is separated according to respective different wave length frequency by the diffraction through the surperficial score line of fiber grating 9, and the two-way laser beam separated is for independently detecting separately again; The operation interval light splitting of described fiber grating 9 choose the related request that will meet optical fiber and optical wavelength, fiber grating face is placed in the focal position after the first plano-convex lens 8, and deflection angle meets the angle value that light beam separates.
Described second plano-concave lens 10a, the 3rd plano-concave lens 10b are positioned at fiber grating 9 light splitting side, and described second plano-concave lens 10a, the 3rd plano-concave lens 10b are arranged at the optical axis place of separately laser beam separately, its position and respective optical axis center symmetry; Described second plano-concave lens 10a, the 3rd plano-concave lens 10b are placed on the laser beam optical axis center of each bundle different wave length that fiber grating 9 separates respectively, are connected with the optical axis spacial alignment of the laser beam of respective corresponding wavelength, and respective Central Symmetry; The laser beam of the different wave length separated through fiber grating 9 is carrying out secondary focusing through the second respective plano-concave lens 10a or the 3rd plano-concave lens 10b, make each self-focusing of light beam separately, in this process, optical information energy keeps little decay, to make the light signal that the photoelectric detector of rear end is large as far as possible; Described second plano-concave lens 10a, the 3rd plano-concave lens 10b should choose low energy loss, the lens that transmitance is higher, and profile size is mated with pick-up unit whole structure;
Described first photodetector connects the second plano-concave lens 10a and is in its focal length place, and the first photodetector also connects the first photoelectric commutator 11a simultaneously; Second photodetector connects the 3rd plano-concave lens 10b and is in its focal length place, and the second photodetector also connects the second photoelectric commutator 11b simultaneously; Described first photodetector and the second photodetector are on the optical axis of each self-focusing of the laser beam of respective different wave length frequency as quick unit; The two-way laser beam focus of respective different wave length frequency to luminous point enter into the first photodetector and the second photodetector enter photosensitive first hole, light-to-current inversion is carried out separately through the first photoelectric commutator 11a, the second photoelectric commutator 11b of the first photodetector, the second photodetector and its rear end, light signal is changed into electric signal export, in back-end computer, carry out data acquisition process calculate gas real time temperature data; The wavelength should restrainting laser instrument Output of laser separately with choose two of choosing of described photodetector service band response matches.
It is fixedly locked after the pick-up unit of above entirety completes according to each device related request and device space position adjustments, the laser beam sent, three plano-convex lenss, fiber grating light and photosensitive mouths of photodetector all Central Symmetries on same axial plane, when its object is to ensure that light path detects, optics system stability photosignal is undistorted.
Described power supply, laser instrument, laser driver, laser signal generator, laser signal debugger, single-mode fiber, light bundling device, optical fiber collimator, plano-convex lens, fiber grating and photodetector are commercially available element.
In addition, the utility model also provides a kind of TDLAS gas thermometric detection method based on optical spectroscopic system, and it is implemented based on above-mentioned thermometric pick-up unit, and the method comprises the steps:
Step S1: after Power supply, described first laser instrument 2a, second laser 2b, laser signal generator 3, laser signal debugger 4 are opened;
Step S2: wavelength, frequency attribute parameter that laser signal generator 3 is intrinsic according to laser instrument, match settings detects the laser frequency reference value of gas relatively, generate initial laser signal generation instruction, drive the first laser instrument 2a and second laser 2b to generate initial laser beam to the first laser driver and the second laser driver;
Step S3: the laser frequency near laser signal debugger 4 pairs of reference values and gas to be measured need the laser wavelength range of emphasis collection to carry out loading the debugging of sawtooth signal, the light signal that the laser beam after debugging is sent is consistent with during debugging; Then corrected signal is generated to laser signal generator 3; Described laser signal generator 3 generates according to corrected signal and revises rear laser signal generation instruction, drives the first laser instrument 2a and second laser 2b generated frequency, the revised laser beam of wavelength to the first laser driver and the second laser driver; Now the first laser instrument 2a and second laser 2b starts the laser sending required wavelength;
Step S4: the Laser Transmission that described first laser instrument 2a and second laser 2b exports by single-mode fiber 13 is to optical-fiber bundling device 5;
Step S5: two-way single-mode fiber 13 is transmitted the laser come and closes bundle through front end and be combined into the laser beam of a branch of two kinds of wavelength mode in rear end by optical-fiber bundling device 5;
Step S6: the laser beam sending miniature deformation is carried out refraction correction by collimation lens by optical fiber collimator 6, sends collimated laser beam in optical fiber collimator 6 rear end;
Step S7: the laser beam sent through optical fiber collimator 6 is entering in the first plano-convex lens 8 behind burning gases field, collimate parallel after laser beam light beam after by burning gases field there is small deviation, after the first plano-convex lens 8 refraction condensation, laser beam is converged again;
Step S8: the laser beam of the respective wavelength of two bundles after fiber grating 9 points of folding bundles;
Step S9: the laser beam of the different wave length separated through fiber grating 9 is carrying out secondary focusing through the second respective plano-concave lens 10a or the 3rd plano-concave lens 10b, makes each self-focusing of light beam separately;
Step S10: separately different wave length frequency two-way laser beam focus to luminous point enter into the first photodetector and the second photodetector enter photosensitive first hole, light-to-current inversion is carried out separately through the first photoelectric commutator 11a, the second photoelectric commutator 11b of the first photodetector, the second photodetector and its rear end, light signal is changed into electric signal export, in back-end computer, carry out data acquisition process calculate gas real time temperature data.
Describe in detail below in conjunction with specific embodiment.
Embodiment
In the present embodiment, as shown in Figure 1, by laser instrument, laser driver, laser signal generator, the mutual exact connect ion of laser signal modulator and and be connected with power lead, single-mode fiber is connected separately with two-laser, and optical-fiber bundling device is connected in two single-mode fibers and makes two-way Laser synthesizing one tunnel laser beam.One road fiber laser beam of synthesis is connected transmitted beam with optical fiber collimator, plano-convex lens 1 is placed after gas flame burning to be measured, position, lens center consistent with optical fiber collimator center (coaxial) is also fixing, fiber grating face is placed on focal position place, plano-convex lens 1 rear end, two plano-convex lenss 2 are placed on grating respectively and separate on the laser beam optical axis center of each bundle different wave length, photodetector is placed on each different wave length laser beam after the plano-convex lens 2 of secondary focusing, and is placed on plano-convex lens 2 focal length place.The laser beam that optical fiber collimator sends, plano-convex lens 1,2, fiber grating light three is on same axial plane and at lens place Central Symmetry.It is fixedly locked after a whole set of pick-up unit each device space position adjustments completes.After fixing, group data-signal conversion line of two in photoelectric transformer is connected with computer equipment, a whole set of pick-up unit installation simultaneously.
In the present embodiment, the laser instrument preferentially taked is semiconductor tunable laser instrument, energy is higher, the collimated laser beam sent after collimating apparatus adjustment is after gas flame combustion field to be measured passes, the laser energy of scattering is converged in focusing through lens, the precision of grating is utilized to carry out the separation and Extraction of light beam, extract single pure different wave length laser beam, moving towards again through lens converging beam according to respective laser beam after light splitting, after ensureing grating beam splitting, light beam noenergy is lost, converge laggard enter in photodetector, ensure that the substantially lossless reception of integral device rear end part light signal is in photoelectric transformer, and integral device devices function scope matches, be conducive to Computer signal process.
Can should operate according to following steps based on the TDLAS gas thermometric pick-up unit of optical spectroscopic system:
The first step: complete the assembling of each device and fix;
Second step: power-on, and after regulating the operation wavelength of laser signal generator and laser signal debugger, laser instrument sends specific wavelength laser under the effect of laser driver.
3rd step: laser is through regulating plano-convex lens 1 position behind combustion zone by light beam through its center.
4th step: regulate fiber grating locus to make original screen panel separate the laser beam of different wave length.
5th step: place plano-convex lens 2 according to the optical axis of the laser beam of separating and at optical axis center place.
6th step: the photoelectric transformer of placing respective laser beam at plano-convex lens 2 focal length place, and focused light enters in detector.
7th step: photoelectric transformer data line connects computing machine and real-time monitored process electric signal.
8th step: according to computing machine thermometric processing module, extracts two path signal zig-zag absorption peak region area, compares, as calculated machine process computing, obtain combustion field temperature value to be measured.
9th step: repetitive measurement gets the mean value of gaseous combustion to be measured, reduces error, improves precision.
The present embodiment adopts semiconductor tunable laser instrument to be used as detection light source, and light beam is assembled, and dissipate energy is little, and better gather the light signal in combustion field, photoelectric transformer responsiveness is sensitive meets gas band operation needs.Overall gas temp measuring system is built simple and easy, and precision is higher, and device maintenance period is long, is convenient to engineering site test and detects.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection domain of the present utility model.
Claims (1)
1., based on a TDLAS gas thermometric pick-up unit for optical spectroscopic system, it is characterized in that, described device is divided into two parts centered by burning gases field; What be positioned at side, burning gases field is light source transmitting terminal, and what be positioned at burning gases field opposite side is light source receiving end;
Described light source transmitting terminal comprises: power supply, the first laser instrument (2a), second laser (2b), laser signal generator (3), laser signal debugger (4), single-mode fiber (13), optical-fiber bundling device (5), optical fiber collimator (6); Wherein, described first laser instrument (2a) carries the first laser driver, and described second laser (2b) carries the second laser driver;
Described light source receiving end comprises: the first plano-convex lens (8), fiber grating (9), the second plano-concave lens (10a), the 3rd plano-concave lens (10b), the first photodetector, the second photodetector, the first photoelectric commutator (11a), the second photoelectric commutator (11b);
The electric source line interface of described first laser instrument (2a), second laser (2b), laser signal generator (3), laser signal debugger (4) is interconnected and unifies to be connected to the power supply interface power lead (2) of power supply; Described power supply is used for for described first laser instrument (2a), second laser (2b), laser signal generator (3), laser signal debugger (4) provide working power voltage;
Described laser signal generator (3) connects the first laser driver, the second laser driver and laser signal debugger (4) respectively;
Described single-mode fiber (13) connects the first laser instrument (2a) output port, second laser (2b) output port and optical-fiber bundling device (5) input port respectively;
Described optical fiber collimator (6) is connected to optical-fiber bundling device (5) rear end, close after the two-beam fibre synthesis beam of laser after bundle through optical-fiber bundling device (5), connect and enter optical fiber collimator (6) front end, the laser beam sending miniature deformation through the refraction correction of collimation lens, sends collimated laser beam in optical fiber collimator (6) rear end in optical fiber collimator (6);
Described first plano-convex lens (8) is arranged in the opposite side of burning gases field relative to light source transmitting terminal, be positioned at the front end of light source receiving end, and be on the exit path of described optical fiber collimator (6), the first plano-convex lens (8) center and optical fiber collimator (6) center coaxial;
Described fiber grating (9) is positioned at the first plano-convex lens (8) rear end, and fiber grating (9) surface is in the focal position place of the first plano-convex lens (8), becomes certain steering angle with optical axis,
Described second plano-concave lens (10a), the 3rd plano-concave lens (10b) are positioned at fiber grating (9) light splitting side, described second plano-concave lens (10a), the 3rd plano-concave lens (10b) are arranged at the optical axis place of separately laser beam separately, its position and respective optical axis center symmetry; Described second plano-concave lens (10a), the 3rd plano-concave lens (10b) are placed on the laser beam optical axis center of each bundle different wave length that fiber grating (9) separates respectively, be connected with the optical axis spacial alignment of the laser beam of respective corresponding wavelength, and respective Central Symmetry;
Described first photodetector connects the second plano-concave lens (10a) and is in its focal length place, and the first photodetector also connects the first photoelectric commutator (11a) simultaneously; Second photodetector connects the 3rd plano-concave lens (10b) and is in its focal length place, and the second photodetector also connects the second photoelectric commutator (11b) simultaneously; Described first photodetector and the second photodetector are in as quick unit on the optical axis of each self-focusing of the laser beam of respective different wave length frequency.
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| CN201420617030.2U CN204359458U (en) | 2014-10-23 | 2014-10-23 | Based on the TDLAS gas thermometric pick-up unit of optical spectroscopic system |
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| CN201420617030.2U CN204359458U (en) | 2014-10-23 | 2014-10-23 | Based on the TDLAS gas thermometric pick-up unit of optical spectroscopic system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20171023 |