CN104330189B - TDLAS gas temperature measurement detection method based on optical light-splitting system - Google Patents
TDLAS gas temperature measurement detection method based on optical light-splitting system Download PDFInfo
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Abstract
The invention belongs to the technical field of optical detection and especially relates to a TDLAS gas temperature measurement detection method based on an optical light-splitting system. According to the scheme, a high-power semiconductor tunable laser is served as a working light source; the laser can carry out variable frequency detection at specific fluctuations, and the precision of the detection range is wide; after a fiber collimator emits parallel light beams, the light beams pass through a combustion field, and the light beams are gathered through a lens; and accurate light-splitting is carried out by utilizing an optical grating light-splitting system. According to the scheme, the split laser beams are refracted and focused through the lens, so that the focusing energy of light signals can be better improved, and the temperature of the combustion flame field gas to be detected is then measured. After the optical grating beam-splitting, singleness of the wavelength is good, image spot focus energy is relatively high, after beam-splitting and secondary focusing, the energy of optical signals is lossless, measuring result precision is high, lost energy is small, the system is easy to construct, and operation is convenient. The method is suitable for industrial production detection.
Description
Technical field
The invention belongs to technical field of optical detection is and in particular to a kind of TDLAS gas based on optical spectroscopic system is surveyed
Temperature detection method.
Background technology
With the reach of science, the progress of scientific and technological level, during social production, Product checking technology is improved constantly, by
The detection meanss iterative method of engineering propertiess originally to the detection meanss of photoelectric technology, wherein gas detecting be instantly the most before
Looking forward or upwards property, there are the detection meanss of market value, monitor in real time measurement is carried out to the temperature in gas combustion and content, main apply
In the temperature detection of the production of industrial miniaturization, through engineering approaches equipment, such as steel plant, incineration plant, boiler factory etc..Original mechanical measurement
Temperature device index is relatively low, and degree of accuracy is low, and measurement range is little, can not meet industrialized work in hot environment requirement.And for light
Electro-detection technology, its laser detection high precision, error is little, and system building is simple, easy and simple to handle, substantially disclosure satisfy that commercial production
Detection demand, and it is directed to the scheme of TDLAS gas thermometric detection, the technical scheme of comparative maturity does not occur at present yet.
Content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is：How a kind of TDLAS gas thermometric based on optical spectroscopic system is provided
Detection technique scheme.
(2) technical scheme
For solving above-mentioned technical problem, the present invention provides a kind of detection of the TDLAS gas thermometric based on optical spectroscopic system
Method, it is based on gas thermometric detection means, and described gas thermometric detection means is divided into two centered on burning gases field
Point；It is light source transmitting terminal positioned at burning gases field side, be light source receiving terminal positioned at burning gases field opposite side；
Described light source transmitting terminal includes：Power supply, first laser device 2a, second laser 2b, laser signal generator 3, swash
Optical signal debugger 4, single-mode fiber 13, optical-fiber bundling device 5, optical fiber collimator 6；Wherein, described first laser device 2a comes with
First laser driver, described second laser 2b comes with second laser driver；Described light source receiving terminal includes：First is flat
Convex lenss 8, fiber grating 9, the second planoconcave lenses 10a, the 3rd planoconcave lenses 10b, the first photodetector, the second photodetection
Device, the first optical-electrical converter 11a, the second optical-electrical converter 11b；
Described first laser device 2a, second laser 2b, laser signal generator 3, the power line of laser signal debugger 4
Interface is connected with each other and unifies the power supply interface power line 2 connecting to power supply；Described laser signal generator 3 connects first respectively
Laser driver, second laser driver and laser signal debugger 4；Described single-mode fiber 13 connects first laser device respectively
2a output port, second laser 2b output port and optical-fiber bundling device 5 input port；Described optical-fiber bundling device 5 input
Mouth connects the single-mode fiber 13 that first laser device 2a and second laser 2b each transmits respectively；Described optical fiber collimator 6 connects
In optical-fiber bundling device 5 rear end；
Described first planoconvex lenss 8 are located at the opposite side with respect to light source transmitting terminal in burning gases field, connect positioned at light source
The front end of receiving end, and being on the exit path of described optical fiber collimator 6, the first planoconvex lenss 8 center and fiber optic collimator
Device 6 center is coaxial；Described fiber grating 9 is located at the first planoconvex lenss 8 rear end, and to be in first flat on fiber grating 9 surface
At the focal position of convex lenss 8；Described second planoconcave lenses 10a, the 3rd planoconcave lenses 10b are located at fiber grating 9 light splitting side,
Each it is arranged at the optical axis of separate laser beam, its position is symmetrical with respective optical axis center；Described first photodetector is even
Meet the second planoconcave lenses 10a and be at its focal length, the first photodetector is also connected with the first optical-electrical converter 11a simultaneously；The
Two photodetectors connect the 3rd planoconcave lenses 10b and are at its focal length, and the second photodetector is also connected with the second light simultaneously
Electric transducer 11b；Described first photodetector and the second photodetector image-sensitive unit are in swashing of respective different wave length frequency
On the optical axis of each self-focusing of light beam；
Specifically, described gas thermometric detection method comprises the steps：
Step S1：After power supply is powered, described first laser device 2a, second laser 2b, laser signal generator 3, laser
Signal debugger 4 is opened；
Step S2：, according to the intrinsic wavelength of laser instrument, frequency attribute parameter, match settings are relatively for laser signal generator 3
The laser frequency reference value of detected gas, generates initial laser signal and instructs, to first laser driver and second laser
Driver generates initial laser beam driving first laser device 2a and second laser 2b；
Step S3：Laser signal debugger 4 needs swashing of emphasis collection to the laser frequency near reference value and under test gas
Optical wavelength range carries out loading the debugging of sawtooth signal the optical signal that sends of laser beam and during debugging one so that after debugging
Cause；Then generate revise signal to laser signal generator 3；Described laser signal generator 3 generates according to revise signal and revises
Laser signal instructs afterwards, to drive first laser device 2a and second to swash to first laser driver and second laser driver
Light device 2b generates frequency, the revised laser beam of wavelength；Needed for now first laser device 2a and second laser 2b begins to send out
Want the laser of wavelength；
Step S4：Single-mode fiber 13 is by the Laser Transmission of described first laser device 2a and second laser 2b output to optical fiber
Bundling device 5；
Step S5：Two-way single-mode fiber 13 is transmitted the laser coming and closes bundle and in rear end combination through front end by optical-fiber bundling device 5
Become the laser beam of a branch of two kinds of wavelength mode；
Step S6：The laser beam sending miniature deformation is carried out refraction correction, in light by collimating lens by optical fiber collimator 6
Fine collimator 6 rear end sends collimated laser beam；
Step S7：The laser beam sending through optical fiber collimator 6 is entering the first planoconvex lenss 8 behind burning gases field
In, small deviation in light beam behind burning gases field in the laser beam after collimation is parallel, poly- through the first planoconvex lenss 8 refraction
Laser beam is made again to converge after light；
Step S8：Fiber grating 9 separately closes the laser beam of the two respective wavelength of bundle after restrainting；
Step S9：Laser beam through the separate different wave length of fiber grating 9 through respective second planoconcave lenses 10a or
3rd planoconcave lenses 10b carries out secondary focusing so that each self-focusing of separate light beam；
Step S10：Each the two-way laser beam focus of different wave length frequency to luminous point enter into the first photodetector
And second photodetector enter in photosensitive unit hole, through the of the first photodetector, the second photodetector and its rear end
One optical-electrical converter 11a, the second optical-electrical converter 11b each carry out light-to-current inversion, and optical signal is changed into electric signal output,
Carry out data acquisition process in backend computer and calculate gas real time temperature data.
(3) beneficial effect
Technical solution of the present invention provides a kind of TDLAS gas thermometric detection technique scheme based on optical spectroscopic system, its
Using high energy semiconductor tunable laser instrument as work light, laser instrument detects in specific fluctuation variable ratio frequency changer, investigative range essence
Really wider, project through optical fiber collimator after directional light light, assemble through lens through combustion field light beam, using optical grating light splitting system
System carries out accurate light splitting, and the laser beam separating through lens Refractive focusing, more can be improved the focus energy of optical signal by the program,
Then detect the temperature of combustion flame field to be measured gas.Wherein, after grating beam splitting, wavelength unicity is preferable, and image patch focus energy is relatively
By force, light signal energy free of losses after secondary focusing after light splitting, high to measurement result degree of accuracy, lost energy is less, and system is taken
Build simple, easy and simple to handle.It is applied to commercial production detection.
Brief description
Fig. 1 is the structural representation of technical solution of the present invention.In figure,
1：Power line；2a：First laser device (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：First planoconvex lenss；9：Fiber grating；
10a：First planoconvex lenss；10b：Second planoconvex lenss；
11a：First optical-electrical converter；11b：Second optical-electrical converter；
12：Photoelectric comparator signal conversion line；13：Single-mode fiber.
Specific embodiment
For making the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to the present invention's
Specific embodiment is described in further detail.
For solving problem of the prior art, the present invention provides a kind of inspection of the TDLAS gas thermometric based on optical spectroscopic system
Survey device, as shown in figure 1, described device is divided into two parts centered on burning gases field；Positioned at burning gases field side
For light source transmitting terminal, it is light source receiving terminal positioned at burning gases field opposite side；
Described light source transmitting terminal includes：Power supply, first laser device 2a, second laser 2b, laser signal generator 3, swash
Optical signal debugger 4, single-mode fiber 13, optical-fiber bundling device 5, optical fiber collimator 6；Wherein, described first laser device 2a comes with
First laser driver, described second laser 2b comes with second laser driver；
Described light source receiving terminal includes：First planoconvex lenss 8, fiber grating 9, the second planoconcave lenses 10a, the 3rd plano-concave are saturating
Mirror 10b, the first photodetector, the second photodetector, the first optical-electrical converter 11a, the second optical-electrical converter 11b；
Described first laser device 2a, second laser 2b, laser signal generator 3, the power line of laser signal debugger 4
Interface is connected with each other and unifies the power supply interface power line 2 connecting to power supply；Described power supply be used for for described first laser device 2a,
Second laser 2b, laser signal generator 3, laser signal debugger 4 provide working power voltage；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 first laser driver, second laser driver and laser signal respectively
Debugger 4；
Described laser signal generator 3 is used for according to the intrinsic wavelength of laser instrument, frequency attribute parameter, and match settings are relatively
The laser frequency reference value of detected gas, generates initial laser signal and instructs, to first laser driver and second laser
Driver generates initial laser beam driving first laser device 2a and second laser 2b；
Described laser signal debugger 4 is used for the laser frequency near reference value and under test gas are needed with swashing of emphasis collection
Optical wavelength range carries out loading the debugging of sawtooth signal the optical signal that sends of laser beam and during debugging one so that after debugging
Cause；Then generate revise signal to laser signal generator 3；Described laser signal generator 3 generates according to revise signal and revises
Laser signal instructs afterwards, to drive first laser device 2a and second to swash to first laser driver and second laser driver
Light device 2b generates frequency, the revised laser beam of wavelength；Needed for now first laser device 2a and second laser 2b begins to send out
Want the laser of wavelength；Wherein, in the selection 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 wherein laser instrument of selection are consistent with detected gas wave band in groundwork wave band,
Wavelength domain of walker slightly above covers wave band to be measured, more can expand and find what wavelength to be measured floated so in signal tuning wavelength
Determine value range.Laser instrument is chosen for the laser instrument of two kinds of under test gas absorbing wavelength, and purpose compares to two-way laser signal
Determine temperature to calculating；
Described single-mode fiber 13 connects first laser device 2a output port, second laser 2b output port and light respectively
Fine bundling device 5 input port；Described single-mode fiber 13 is used for swashing described first laser device 2a and second laser 2b output
Optical transport is to optical-fiber bundling device 5；Wherein, in the transmitting procedure of laser, apply single-mode fiber, and fiber-optic transfer type and laser
Device optical transport mates, single-mode fiber long transmission distance, stable signal transmission, and decay is lower slightly, meets needed for through engineering approaches；
Described optical-fiber bundling device 5 input port connects the list that first laser device 2a and second laser 2b each transmits respectively
Mode fiber 13；Described optical-fiber bundling device 5 is used for for two-way single-mode fiber 13 transmitting the laser coming through front end conjunction bundle and in rear end knot
Synthesize the laser beam of a branch of two kinds of wavelength mode；The selection of described optical-fiber bundling device requires to match with corresponding fiber type
And bundle work can be closed；
Described optical fiber collimator 6 is connected to optical-fiber bundling device 5 rear end, closes the fine conjunction of the two-beam after bundle through optical-fiber bundling device 5
After becoming beam of laser, connect and enter optical fiber collimator 6 front end, send the laser beam of miniature deformation in optical fiber collimator 6 through standard
The refraction correction of straight lens, sends collimated laser beam in optical fiber collimator 6 rear end；The selection of described optical fiber collimator with corresponding
Close the fiber type after number to match；
Described first planoconvex lenss 8 are located at the opposite side with respect to light source transmitting terminal in burning gases field, connect positioned at light source
The front end of receiving end, and being on the exit path of described optical fiber collimator 6, the first planoconvex lenss 8 center and fiber optic collimator
Device 6 center is coaxial；The laser beam sending through optical fiber collimator 6 is entering the first planoconvex lenss 8 behind burning gases field
In, laser beam and the coaxial and axial symmetry of the first planoconvex lenss 8；Laser beam after collimation is parallel is in light beam behind burning gases field
The small deviation of meeting, makes laser beam again converge after the first planoconvex lenss 8 refraction condensation, to ensure light beam with the light letter of high-energy
Breath enters fiber grating 9 surface；Described first planoconvex lenss should choose mental retardation loss, and transmitance is higher, size and detection means
Whole structure mates；
Described fiber grating 9 is located at the first planoconvex lenss 8 rear end, and fiber grating 9 surface is in the first planoconvex lenss 8
At focal position, become certain steering angle with optical axis, two after described fiber grating 9 is used for separately closing bundle restraint swashing of respective wavelength
Light beam, the angle value that its deflection angle and light beam separate matches；Through the first planoconvex lenss 8 conjunction Shu Jiguang in the first plano-convex
Lens 8 optical axis focal point, and it is transmitted through fiber grating 9 surface, will close after bundle through the diffraction of fiber grating 9 surface score line
Laser beam according to respective different wave length frequency separately, separate two-way laser beam is used for each independently being detected again；Institute
The selection stating the operation interval light splitting of fiber grating 9 will meet the related request of optical fiber and optical wavelength, and fiber grating face is placed in
Focal position after first planoconvex lenss 8, deflection angle meets the separate angle value of light beam.
Described second planoconcave lenses 10a, the 3rd planoconcave lenses 10b are located at fiber grating 9 light splitting side, described second plano-concave
Lens 10a, the 3rd planoconcave lenses 10b are each arranged at the optical axis of separate laser beam, its position and respective optical axis center pair
Claim；Described second planoconcave lenses 10a, the 3rd planoconcave lenses 10b are individually positioned in each bundle different wave length that fiber grating 9 separates
On laser beam optical axis center, it is connected with the optical axis spacial alignment of the laser beam of respective corresponding wavelength, and respective centrosymmetry；Through light
The laser beam of the separate different wave length of fine grating 9 is being carried out through respective second planoconcave lenses 10a or the 3rd planoconcave lenses 10b
So that each self-focusing of separate light beam, during being somebody's turn to do, optical information energy keeps little decay to secondary focusing, so that the photoelectricity of rear end
Detector receives optical signal as big as possible；Described second planoconcave lenses 10a, the 3rd planoconcave lenses 10b should choose mental retardation loss,
The higher lens of transmitance, profile size is mated with detection means whole structure；
Described first photodetector connects the second planoconcave lenses 10a and is at its focal length, the first photodetection simultaneously
Device is also connected with the first optical-electrical converter 11a；Second photodetector connects the 3rd planoconcave lenses 10b and is at its focal length, with
When the second photodetector be also connected with the second optical-electrical converter 11b；Described first photodetector and the second photodetector picture
Quick unit is on the optical axis of each self-focusing of the laser beam of respective different wave length frequency；Each two-way laser of different wave length frequency
That restraints that the luminous point that focuses on enters into the first photodetector and the second photodetector enters in photosensitive unit hole, through the first photoelectricity
The first optical-electrical converter 11a of detector, the second photodetector and its rear end, the second optical-electrical converter 11b each carry out light
Electricity conversion, is changed into electric signal output optical signal, and carrying out data acquisition process in backend computer, to calculate gas real-time
Temperature data；The selection of described photodetector service band response should each export the ripple of laser with the two bundle laser instrument chosen
Length matches.
Above overall detection means according to fixedly locked after the completion of each device related request and device space position adjustments,
The laser beam that sends, three planoconvex lenss, fiber grating light and the photosensitive mouth of photodetector are all at same optical axis Mian Shang center pair
Claim, when its object is to ensure light path detection, optics system stability photosignal is undistorted.
Described power supply, laser instrument, laser driver, laser signal generator, laser signal debugger, single-mode fiber, light
Line bundling device, optical fiber collimator, planoconvex lenss, fiber grating and photodetector are commercially available element.
Additionally, the present invention also provides a kind of TDLAS gas thermometric detection method based on optical spectroscopic system, it is based on upper
State thermometric detection means to implement, the method comprises the steps：
Step S1：After power supply is powered, described first laser device 2a, second laser 2b, laser signal generator 3, laser
Signal debugger 4 is opened；
Step S2：, according to the intrinsic wavelength of laser instrument, frequency attribute parameter, match settings are relatively for laser signal generator 3
The laser frequency reference value of detected gas, generates initial laser signal and instructs, to first laser driver and second laser
Driver generates initial laser beam driving first laser device 2a and second laser 2b；
Step S3：Laser signal debugger 4 needs swashing of emphasis collection to the laser frequency near reference value and under test gas
Optical wavelength range carries out loading the debugging of sawtooth signal the optical signal that sends of laser beam and during debugging one so that after debugging
Cause；Then generate revise signal to laser signal generator 3；Described laser signal generator 3 generates according to revise signal and revises
Laser signal instructs afterwards, to drive first laser device 2a and second to swash to first laser driver and second laser driver
Light device 2b generates frequency, the revised laser beam of wavelength；Needed for now first laser device 2a and second laser 2b begins to send out
Want the laser of wavelength；
Step S4：Single-mode fiber 13 is by the Laser Transmission of described first laser device 2a and second laser 2b output to optical fiber
Bundling device 5；
Step S5：Two-way single-mode fiber 13 is transmitted the laser coming and closes bundle and in rear end combination through front end by optical-fiber bundling device 5
Become the laser beam of a branch of two kinds of wavelength mode；
Step S6：The laser beam sending miniature deformation is carried out refraction correction, in light by collimating lens by optical fiber collimator 6
Fine collimator 6 rear end sends collimated laser beam；
Step S7：The laser beam sending through optical fiber collimator 6 is entering the first planoconvex lenss 8 behind burning gases field
In, small deviation in light beam behind burning gases field in the laser beam after collimation is parallel, poly- through the first planoconvex lenss 8 refraction
Laser beam is made again to converge after light；
Step S8：Fiber grating 9 separately closes the laser beam of the two respective wavelength of bundle after restrainting；
Step S9：Laser beam through the separate different wave length of fiber grating 9 through respective second planoconcave lenses 10a or
3rd planoconcave lenses 10b carries out secondary focusing so that each self-focusing of separate light beam；
Step S10：Each the two-way laser beam focus of different wave length frequency to luminous point enter into the first photodetector
And second photodetector enter in photosensitive unit hole, through the of the first photodetector, the second photodetector and its rear end
One optical-electrical converter 11a, the second optical-electrical converter 11b each carry out light-to-current inversion, and optical signal is changed into electric signal output,
Carry out data acquisition process in backend computer and calculate gas real time temperature data.
To describe in detail with reference to specific embodiment.
Embodiment
In the present embodiment, as shown in figure 1, laser instrument, laser driver, laser signal generator, laser signal are modulated
Device mutually correctly connect and and be connected with power line, single-mode fiber is each connected with two-laser, and optical-fiber bundling device is connected to two
Two-way Laser synthesizing one road laser beam is made in single-mode fiber.One road fiber laser beam of synthesis is connected launching light with optical fiber collimator
Bundle, places planoconvex lenss 1 after under test gas flame combustion, and lens centre position is consistent with optical fiber collimator center (altogether
Axle) and fixing, and fiber grating face is placed at planoconvex lenss 1 rear end focal position, and two planoconvex lenss 2 are individually positioned in grating
Separate on the laser beam optical axis center of each bundle different wave length, photodetector is placed on each different wave length laser beam in secondary focusing
Planoconvex lenss 2 after, and be placed at planoconvex lenss 2 focal length.Laser beam that optical fiber collimator sends, planoconvex lenss 1,2, optical fiber
Grating light three centrosymmetry on same optical axis face and at lens.The each device space position adjustments of a whole set of detection means complete
Fixedly locked afterwards.After fixing, two groups of data signal conversion lines in photoelectric comparator are connected with computer equipment simultaneously, a whole set of
Detection means installation.
In the present embodiment, the laser instrument preferentially taken is quasiconductor tunable laser instrument, and energy is higher, and collimator adjusts
After under test gas flame combustion field passes, the focusing through lens converges the laser energy of scattering to the collimated laser beam sending afterwards
Poly-, carry out the separation and Extraction of light beam using the precision of grating, extract single pure different wave length laser beam, in root after light splitting
Move towards again through lens converging beam it is ensured that light beam noenergy loss after grating beam splitting according to respective laser beam, after convergence, enter light
It is ensured that integral device rear end part optical signal is substantially lossless receives to photoelectric comparator in electric explorer, and integral device
Device working range matches, and is conducive to Computer signal to process.
Operation should can be followed the steps below based on the TDLAS gas thermometric detection means of optical spectroscopic system：
The first step：Complete assembling and the fixation of each device；
Second step：Power-on, and adjust laser after laser signal generator and the operation wavelength of laser signal debugger
Device sends specific wavelength laser in the presence of laser driver.
3rd step：Laser adjusts planoconvex lenss 1 position by light beam through its center position after passing through combustion zone.
4th step：Adjusting fiber grating locus makes original screen panel separate the laser beam of different wave length.
5th step：Optical axis according to separate laser beam places planoconvex lenss 2 and at optical axis center.
6th step：Place the photoelectric comparator of respective laser beam at planoconvex lenss 2 focal length, and focus light into detector
In.
7th step：Photoelectric comparator data wire connects computer and real-time monitored processes the signal of telecommunication.
8th step：According to computer thermometric processing module, extract two path signal zig-zag absworption peak region area, enter
Row compares, and processes computing through computer, obtains combustion field temperature value to be measured.
9th step：Repeatedly measurement takes the meansigma methodss of under test gas burning, reduces error, improves precision.
The present embodiment adopts quasiconductor tunable laser instrument to be used as detection light source, and light beam is assembled, and lost energy is little, preferably
Optical signal in collection combustion field, photoelectric comparator responsiveness is sensitive to meet gas band operation needs.Overall gas thermometric system
System is built simply, and precision is higher, and device maintenance period is long, is easy to engineering site test detection.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
For member, on the premise of without departing from the technology of the present invention principle, some improvement can also be made and deform, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of TDLAS gas thermometric detection method based on optical spectroscopic system is it is characterised in that it is based on the inspection of gas thermometric
Survey device to implement, described gas thermometric detection means is divided into two parts centered on burning gases field；Positioned at burning gases
Side for light source transmitting terminal, be light source receiving terminal positioned at burning gases field opposite side；
Described light source transmitting terminal includes：Power supply, first laser device (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
Device (2a) comes with first laser driver, and described second laser (2b) comes with second laser driver；Described light source connects
Receiving end includes：First planoconvex lenss (8), fiber grating (9), the second planoconcave lenses (10a), the 3rd planoconcave lenses (10b), first
Photodetector, the second photodetector, the first optical-electrical converter (11a), the second optical-electrical converter (11b)；
Described first laser device (2a), second laser (2b), laser signal generator (3), the electricity of laser signal debugger (4)
Source line interface is connected with each other and unifies the power supply interface power line (2) connecting to power supply；Described laser signal generator (3) is respectively
Connect first laser driver, second laser driver and laser signal debugger (4)；Described single-mode fiber (13) connects respectively
Connect first laser device (2a) output port, second laser (2b) output port and optical-fiber bundling device (5) input port；Described
Optical-fiber bundling device (5) input port connects the single-mode fiber that first laser device (2a) and second laser (2b) each transmit respectively
(13)；Described optical fiber collimator (6) is connected to optical-fiber bundling device (5) rear end；
Described first planoconvex lenss (8) are located at the opposite side in burning gases field with respect to light source transmitting terminal, receive positioned at light source
The front end at end, and be on the exit path of described optical fiber collimator (6), the first planoconvex lenss (8) center is accurate with optical fiber
Straight device (6) center is coaxial；Described fiber grating (9) is located at the first planoconvex lenss (8) rear end, and fiber grating (9) surface
It is at the focal position of the first planoconvex lenss (8)；Described second planoconcave lenses (10a), the 3rd planoconcave lenses (10b) are located at light
Fine grating (9) light splitting side, is each arranged at the optical axis of separate laser beam, its position is symmetrical with respective optical axis center；Institute
State the first photodetector to connect the second planoconcave lenses (10a) and be at its focal length, the first photodetector is also connected with simultaneously
First optical-electrical converter (11a)；Second photodetector connects the 3rd planoconcave lenses (10b) and is simultaneously at its focal length, and simultaneously the
Two photodetectors are also connected with the second optical-electrical converter (11b)；Described first photodetector and the second photodetector image-sensitive
Unit is on the optical axis of each self-focusing of the laser beam of respective different wave length frequency；
Specifically, described gas thermometric detection method comprises the steps：
Step S1：After power supply is powered, described first laser device (2a), second laser (2b), laser signal generator (3), swash
Optical signal debugger (4) is opened；
Step S2：Laser signal generator (3) is according to the intrinsic wavelength of first laser device (2a), second laser (2b), frequency
Property parameters, match settings, relative to the laser frequency reference value of detected gas, generate initial laser signal and instruct, to first
Laser driver and second laser driver generate initial laser beam driving first laser device (2a) and second laser (2b)；
Step S3：Laser signal debugger (4) needs the laser of emphasis collection to the laser frequency near reference value and under test gas
Wave-length coverage carries out loading the debugging of sawtooth signal so that the optical signal that sends of laser beam after debugging is consistent with when debugging；
Then generate revise signal to laser signal generator (3)；Described laser signal generator (3) generates according to revise signal and revises
Laser signal instructs afterwards, to drive first laser device (2a) and second to first laser driver and second laser driver
Laser instrument (2b) generates frequency, the revised laser beam of wavelength；Now first laser device (2a) and second laser (2b) start
Send the laser of required wavelength；
Step S4：The Laser Transmission that described first laser device (2a) and second laser (2b) are exported by single-mode fiber (13) is to light
Fine bundling device (5)；
Step S5：The laser that two-way single-mode fiber (13) transmission comes is closed bundle and in rear end combination through front end by optical-fiber bundling device (5)
Become the laser beam of a branch of two kinds of wavelength mode；
Step S6：The laser beam sending miniature deformation is carried out refraction correction, in optical fiber by collimating lens by optical fiber collimator (6)
Collimator (6) rear end sends collimated laser beam；
Step S7：The laser beam sending through optical fiber collimator (6) is entering the first planoconvex lenss (8) behind burning gases field
In, small deviation in light beam behind burning gases field in the laser beam after collimation is parallel, through the first planoconvex lenss (8) refraction
Laser beam is made again to converge after optically focused；
Step S8：Fiber grating (9) separately closes the laser beam of the two respective wavelength of bundle after restrainting；
Step S9：Laser beam through the separate different wave length of fiber grating (9) through respective second planoconcave lenses (10a) or
3rd planoconcave lenses (10b) carry out secondary focusing so that each self-focusing of separate light beam；
Step S10：Each the two-way laser beam focus of different wave length frequency to luminous point enter into the first photodetector and the
Two photodetectors enter photosensitive unit hole in, through first light of the first photodetector, the second photodetector and its rear end
Electric transducer (11a), the second optical-electrical converter (11b) each carry out light-to-current inversion, and optical signal is changed into electric signal output,
Carry out data acquisition process in backend computer and calculate gas real time temperature data.
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| CN105043589A (en) * | 2015-07-13 | 2015-11-11 | 天津津航技术物理研究所 | TDLAS gas temperature measurement detection method based on beam expanding and focusing system |
| CN104949771A (en) * | 2015-07-13 | 2015-09-30 | 天津津航技术物理研究所 | TDLAS (tunable diode laser absorption spectroscopy) gas temperature measurement and detection method |
| CA3069323C (en) * | 2017-08-01 | 2022-06-07 | Zoetis Services Llc | Apparatus for analyzing a media, and associated egg identification apparatus and method |
| CN109916532A (en) * | 2019-04-12 | 2019-06-21 | 华能国际电力股份有限公司 | Gas turbine combustion temperature monitoring system based on TDLAS technology |
| CN111751484A (en) * | 2020-04-13 | 2020-10-09 | 中国科学院力学研究所 | Solid-liquid rocket engine fuel burning rate measuring system |
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