CN105043582B - Based on the TDLAS gas thermometric detection devices for expanding focusing system - Google Patents
Based on the TDLAS gas thermometric detection devices for expanding focusing system Download PDFInfo
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- CN105043582B CN105043582B CN201510408002.9A CN201510408002A CN105043582B CN 105043582 B CN105043582 B CN 105043582B CN 201510408002 A CN201510408002 A CN 201510408002A CN 105043582 B CN105043582 B CN 105043582B
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Abstract
The invention belongs to technical field of optical detection, and in particular to a kind of based on the TDLAS gas thermometric detection devices for expanding focusing system.The device is connected with each other by power supply and laser, laser driver, laser signal generator, laser signal debugger, laser sends out light and is transmitted through single mode optical fiber, two beam Laser synthesizing light beams project after optical fiber collimator is parallel after expanding lens barrel and expanding, the light projected after gas temperature in the extraneous burning of detection optical signal after planoconvex spotlight gathers integrating sphere and photodetector changes electric signal, and apparatus back end signal transmission line, which connects computer and handles coherent signal image, calculates its temperature value.Measurement result accuracy of the present invention is preferable, easy to operate, and installation test is simple, suitable for combustion zone inside and outside sensing chamber is smaller or back yard industry flame combustion field, provides temperature data to measuring combustion field and supports.
Description
Technical field
The invention belongs to technical field of optical detection, and in particular to a kind of to be surveyed based on the TDLAS gases for expanding focusing system
Warm detection device.
Background technology
With the reach of science, social progress, product testing technology is continuously improved during social production, by original
For the detection means iterative method of engineering properties to the detection means of photoelectric technology, wherein gas is detected as instantly that foreword has the most
The detection means of social market, to gas, aflame temperature and content carry out real time monitoring measurement, are mainly used in small-sized work
The temperature detection of journey combustion apparatus.Original mechanical measurement temperature device index is relatively low, and accuracy is low, and measurement range is small, base
Originally it cannot meet industrialized high-temperature operation requirement.For photoelectric detecting technology, laser detection precision is high, and error is small, and device is set
Meter debugging is simple, and easy to operate, maintenance period is longer, substantially meets industrial production detection demand.
Invention content
(1) technical problems to be solved
The technical problem to be solved by the present invention is to：How to provide a kind of based on the TDLAS gas thermometrics for expanding focusing system
Detection device.
(2) technical solution
It is detected in order to solve the above technical problems, present invention offer is a kind of based on the TDLAS gases thermometric for expanding focusing system
Device, the thermometric detection device are divided into two parts centered on burning gases field；It is light positioned at burning gases field side
Source transmitting terminal, positioned at burning gases field, opposite side is light source receiving terminal；And burning gases field space is by 14 shape of pyroceram
Into, and which is provided with combustion supervision mouth 8；
The light source transmitting terminal includes：Power supply, second laser 2b, laser signal debugger 3, swashs first laser device 2a
Optical signal generator 4, single mode optical fiber 13, laser bundling device 5, optical fiber collimator 6, laser beam expanding lens barrel 7；Wherein, described first
Laser 2a comes with first laser driver, and the second laser 2b comes with second laser driver；The light source connects
Receiving end includes：Planoconvex spotlight 9, integrating sphere 11, the first photodetector, the second photodetector, the first photoelectric converter 10a,
Second photoelectric converter 10b, photoelectric transformer signal conversion line 12；
The first laser device 2a, second laser 2b, laser signal generator 4, laser signal debugger 3 power cord
Interface is connected with each other and is uniformly connected to the power supply interface power cord 1 of power supply；The laser signal generator 4 connects first respectively
Laser driver, second laser driver and laser signal debugger 3；The single mode optical fiber 13 connects first laser device respectively
5 input port of 2a output ports, second laser 2b output ports and laser bundling device；5 input terminal of laser bundling device
The mouth single mode optical fiber 13 that connection first laser device 2a and second laser 2b is respectively transmitted respectively；The optical fiber collimator 6 connects
In 5 back end output of laser bundling device；Laser beam expanding lens barrel 7 is connected to 6 back end output of optical fiber collimator；
The planoconvex spotlight 9 is located at relative to the opposite side of light source transmitting terminal in burning gases field, positioned at light source receiving terminal
Front end, and on the exit path in the laser beam expanding lens barrel 7, in 9 center of planoconvex spotlight and laser beam expanding lens barrel 7
Heart position is coaxial；The integrating sphere 11 is located at 9 rear end of planoconvex spotlight, and 9 focal position of planoconvex spotlight is in 11 incidence hole of integrating sphere
In diameter；There are a light inlet and two-way light-emitting window inside integrating sphere 11, according to the first laser device 2a's and second laser 2b
Optical maser wavelength difference carries out optical filter light splitting so that is divided by integrated 11 optical filter of ball of light beam, separates respective frequency
Light has light-emitting window respectively to get；Photodetector is each provided at 11 two light-emitting windows of integrating sphere, is divided into the spy of the first photoelectricity
Survey device and the second photodetector, the first photodetector connects the first photoelectric converter 10a, the second photodetector connection the
Two photoelectric converter 10b；And first photoelectric converter 10a response wave bands match with first laser device 2a service bands, second
Photoelectric converter 10b response wave bands match with second laser 2b service bands, the first photoelectric converter 10a and the second photoelectricity
Converter 10b rear ends connect computer by photoelectric transformer signal conversion line 12；Wherein, the optical fiber collimator 6 is sent out
Laser beam, planoconvex spotlight 9,11 light inlet diameter three of integrating sphere are in the respective central symmetry of same optical axis.
(3) advantageous effect
It is compared with prior art, provided by the invention based on the TDLAS gas thermometric detection devices for expanding focusing system,
It is expanded and lens focus original using optical ray as work light using high energy semiconductor tunable laser inside device
Reason detects the temperature of burning gases to be measured, and measuring accuracy is high, and equipment debugging is simple, easy to operate.
Beneficial effects of the present invention：Using high energy semiconductor tunable laser as work light, laser is specific
Variable ratio frequency changer detection is fluctuated, investigative range is accurately wider, and light beam aggregation is preferable.Measurement result accuracy is high, and the energy that scatters and disappears is smaller,
Device build it is simple, easy to operate, easy to carry, suitable for the temperature detection of mini engineering combustion apparatus.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is outline drawing of the present invention.
In figure：1- power cords；2a- first laser devices (included first laser driver)；2b- second lasers (included the
Dual-laser driver)；3- laser signal debuggers；4- laser signal generators；5- laser bundling devices；6- optical fiber collimators；7-
Laser beam expanding lens barrel；8- combustion supervision mouths；9- planoconvex spotlights；The first photoelectric converters of 10a-；The second photoelectric converters of 10b-；
11- integrating spheres；12- photoelectric transformer signal conversion lines；13- single mode optical fibers；14- pyrocerams；15- shells.
Specific embodiment
To make 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.
To solve problem of the prior art, the present invention provides a kind of based on the TDLAS gases thermometric inspection for expanding focusing system
Device is surveyed, as shown in Figures 1 and 2, the thermometric detection device is divided into two parts centered on burning gases field；Positioned at burning
Gas field side is light source transmitting terminal, and positioned at burning gases field, opposite side is light source receiving terminal；And burning gases field space
It is formed by pyroceram 14, and which is provided with combustion supervision mouth 8；
The light source transmitting terminal includes：Power supply, second laser 2b, laser signal debugger 3, swashs first laser device 2a
Optical signal generator 4, single mode optical fiber 13, laser bundling device 5, optical fiber collimator 6, laser beam expanding lens barrel 7；Wherein, described first
Laser 2a comes with first laser driver, and the second laser 2b comes with second laser driver；The light source connects
Receiving end includes：Planoconvex spotlight 9, integrating sphere 11, the first photodetector, the second photodetector, the first photoelectric converter 10a,
Second photoelectric converter 10b, photoelectric transformer signal conversion line 12；
The first laser device 2a, second laser 2b, laser signal generator 4, laser signal debugger 3 power cord
Interface is connected with each other and is uniformly connected to the power supply interface power cord 1 of power supply；The laser signal generator 4 connects first respectively
Laser driver, second laser driver and laser signal debugger 3；The single mode optical fiber 13 connects first laser device respectively
5 input port of 2a output ports, second laser 2b output ports and laser bundling device；5 input terminal of laser bundling device
The mouth single mode optical fiber 13 that connection first laser device 2a and second laser 2b is respectively transmitted respectively；The optical fiber collimator 6 connects
In 5 back end output of laser bundling device；Laser beam expanding lens barrel 7 is connected to 6 back end output of optical fiber collimator；
The planoconvex spotlight 9 is located at relative to the opposite side of light source transmitting terminal in burning gases field, positioned at light source receiving terminal
Front end, and on the exit path in the laser beam expanding lens barrel 7, in 9 center of planoconvex spotlight and laser beam expanding lens barrel 7
Heart position is coaxial；The integrating sphere 11 is located at 9 rear end of planoconvex spotlight, and 9 focal position of planoconvex spotlight is in 11 incidence hole of integrating sphere
In diameter, it is therefore an objective to fully enter integrating sphere 11 after ensuring all laser beam line focuses；There are a light inlet and two inside integrating sphere 11
Road light-emitting window carries out optical filter light splitting according to the optical maser wavelength difference of the first laser device 2a and second laser 2b so that
It is divided by integrated 11 optical filter of ball of light beam, separating respective frequencies of light has light-emitting window respectively to get；In 11 liang of integrating sphere
Photodetector is each provided at a light-emitting window, is divided into the first photodetector and the second photodetector, the first photoelectricity is visited
It surveys device and connects the first photoelectric converter 10a, the second photodetector connects the second photoelectric converter 10b；And first opto-electronic conversion
Device 10a response wave bands match with first laser device 2a groundwork wave bands, the second photoelectric converter 10b response wave bands and second
Laser 2b groundwork wave bands match, and the first photoelectric converter 10a and the second photoelectric converter 10b rear ends are become by photoelectricity
Parallel operation signal conversion line 12 connects computer, and transmits converted electrical image in a computer in real time；Wherein, the optical fiber is accurate
Laser beam that straight device 6 is sent out, planoconvex spotlight 9,11 light inlet diameter three of integrating sphere in same optical axis, respectively protect by central symmetry, purpose
It is undistorted to hinder light path system stabilization optical signal；
In the course of work, device internal electric source provides voltage for whole detection equipment, is opened on the basis of power supply containing sharp
The setting of laser, laser signal debugger and the laser signal generator of CD-ROM driver, wherein laser signal generator is given at
With respect to detection gas frequency reference value, and to frequency and under test gas emphasis acquire near a reference value in laser signal debugger
Wave-length coverage and load sawtooth signal and debugged.It is consistent when the optical signal that laser beam after debugging is sent out is with debugging.Swash
Light beam is changed to parallel wide light expanding lens barrel transfer to light after optical fiber light-emitting window carries out the collimation of light after single mode optical fiber transmission
Beam, across the pyroceram of combustion field wall after through in planoconvex spotlight Refractive focusing to integrating sphere, light beam is penetrated in integrating sphere outlet
Go out to beat in corresponding photodetector and photoelectric transformer, be converted into electric signal in a computer and carry out data acquisition process meter
Calculate gas real time temperature data.
Wherein, 15 portion of material of rectangular enclosure of the gas thermometric detection device is chosen for high temperature resistant, internal components wall
Surrounding has protecting thermal insulating layer so that device works normally under internal room temperature, and outer refractory prevents gas is external in burning from becoming
Shape.
Wherein, in the selection of laser, according to the wavelength spectral line range of combustion field gas to be detected determine laser
The work groundwork wave band of device, wherein the laser chosen is consistent with detection gas wave band in groundwork wave band, wavelength
Domain of walker slightly above covers wave band to be measured, it is therefore an objective to can more expand in signal tuning wavelength and find wavelength floating to be measured really
Determine value range.
Wherein, laser is chosen for the laser of two kinds of under test gas absorbing wavelengths, and purpose carries out two-way laser signal
Contrast conting temperature.
Wherein, in the transmission process of laser, using single mode optical fiber, and optical fiber transmission is matched with laser, single mode optical fiber
Long transmission distance, stable signal transmission, attenuation is slightly lower, meets needed for engineering.
Wherein, the optical fiber of two-way laser transmission is combined into the laser of a branch of two kinds of wavelength modes through laser bundling device.
Wherein, the fiber exit port connection laser aligner of laser bundling device, it is therefore intended that laser beam is emitted as parallel
Light.
Wherein, laser beam expanding lens barrel is connected to laser aligner exit end, and it is wider that purpose so that collimated light beam is transformed to
Cylindrical type light beam, the effect intensity for assembling focus light are apparent.
Wherein, the port wall both sides in detection device are pyroceram, but after high-temp combustion, no deformation, and refractive index
Centainly.
Wherein, corresponding matching long wavelength laser will be chosen and to inside by detecting the combusting component spectral line of each gas
After light path system debugging combustion supervision is being carried out after immobilising device and external tooling.
In addition, the gas thermometric detection method implemented according to the gas thermometric detection device includes the following steps：
Step S1：Combustion supervision mouth 8 is sleeved on burning gases field areas and fixed thereto；
Step S2：The photoelectric transformer signal conversion line 12 of 10 rear end of photoelectric converter is connected into computer；
Step S3：After power supply power supply, the first laser device 2a, second laser 2b, laser signal generator 4, laser
Signal debugger 3 is opened；
Step S4：For laser signal generator 4 according to the intrinsic wavelength of laser, frequency attribute parameter, match settings are opposite
The laser frequency a reference value of detection gas, generation initial laser signal instructs, until first laser driver and second laser
Driver drives first laser device 2a and the second laser 2b to generate initial laser beam；
Step S5：It is sharp that laser signal debugger 3 needs the laser frequency near a reference value and under test gas emphasis to acquire
Optical wavelength range carries out the debugging of loading sawtooth signal so that one when optical signal that the laser beam after debugging is sent out and debugging
It causes；Then revise signal is generated to laser signal generator 4；The laser signal generator 4 is generated according to revise signal and is corrected
Laser signal instructs afterwards, until first laser driver and second laser driver drive the first laser device 2a and second to swash
Light device 2b generations frequency, the revised laser beam of wavelength；Needed for first laser device 2a and second laser 2b is begun to send out at this time
Want the laser of wavelength；
Step S6：The first laser device 2a and second laser 2b laser exported is transmitted to laser by single mode optical fiber 13
Bundling device 5；
Step S7：Two-way single mode optical fiber 13 is transmitted the laser come and closes beam through front end and combined in rear end by laser bundling device 5
Into the laser beam of a branch of two kinds of wavelength modes；
Step S8：The laser beam for sending out miniature deformation is carried out refraction correction by optical fiber collimator 6 by collimation lens, in light
Fine 6 rear end of collimator sends out laser beam after collimation；
Step S9：Laser beam is converted to parallel angle pencil of ray by laser beam expanding lens barrel 7 after collimation；
Step S10：Parallel angle pencil of ray enters after the pyroceram 14 by burning gases field in planoconvex spotlight 9, accurate
It is straight it is parallel after angle pencil of ray beam after by burning gases field light beam there is small deviation, make after 9 refraction condensation of planoconvex spotlight
Laser beam is converged to again in integrating sphere 11；
Step S11：Integrating sphere 11 separately closes the laser beam of the respective different wave length of two beams after beam；
Step S12：The luminous point that the two-way laser beam focus of the separated respective different wave length frequency of integrated ball 11 arrives enters
To entering in photosensitive first hole for the first photodetector and the second photodetector, visited by the first photodetector, the second photoelectricity
The first photoelectric converter 10a, the second photoelectric converter 10b for surveying device and its rear end respectively carry out light-to-current inversion, and optical signal is turned
Become electric signal output, data acquisition process is carried out in backend computer and calculates gas real time temperature data；
Step S13：Software is handled according to computer thermometric, extracts two path signal zig-zag absorption peak region area,
Processing operation is compared, obtains combustion field temperature value to be measured；
Step S14：The average value that under test gas is taken to burn repeatedly is measured, to reduce error, improves precision.
The present invention is described in detail with reference to specific embodiment.
Embodiment
As shown in Figure 1, the present invention provide it is a kind of based on the TDLAS gas thermometric detection devices for expanding focusing system, in
Portion beam is closed by power supply, laser 2, laser driver, laser signal generator 4, laser signal debugger 3, single mode optical fiber, light
Device, optical fiber collimator 6, laser beam expanding lens barrel 7, pyroceram 14, planoconvex spotlight 9, integrating sphere 11, photodetector, photoelectricity
Converter relevant connection forms.Inner laser device, laser driver, laser signal generator, laser signal modulator are mutually just
Really connection and and connect with power cord, single mode optical fiber is respectively connect with two-laser, and optical-fiber bundling device is connected to two single mode optical fibers
In make two-way Laser synthesizing laser beam all the way.The fiber laser beam all the way of synthesis is connect with optical fiber collimator, and optical fiber collimator goes out
It penetrates end with laser beam expanding lens barrel to be connected, and locks fixed optical fiber collimator and laser beam expanding lens barrel, port fills on two side
There is pyroceram protection, planoconvex spotlight, lens centre position and optical fiber collimator and laser beam expanding lens are placed after port
Cylinder center consistent (coaxial) is simultaneously fixed, and light inlet position is placed on planoconvex spotlight rear end and is placed in its plano-convex in integrating sphere
Focal length of lens position and entering light bore center and lens centre position and optical fiber collimator and laser beam expanding lens barrel centre bit
It is consistent (coaxial) to put three, and fixed integrating sphere.Two light-emitting window of integrating sphere is connected with the photosensitive member part of two photodetectors
Connect fixation, single unit system inside and fixed, two data in the photoelectric transformer of device end after external tooling location determination
Signal conversion line is connect with computer equipment, completes total system connection.
In the present embodiment, the laser which takes is relatively high power semiconductor tunable laser, and energy is higher,
Region to be measured of burning effectively is transmitted through in detection, laser shape to be detected is broadened into tubular by laser beam expanding lens barrel, is conducive to big face
Product provides the reception device by combustion field light beam by planoconvex spotlight the convergence receiving point of higher-energy signal, and simultaneously
Inner product bulb separation beam splitter and photoelectric transformer work respective range match, and acquisition obtains signal and is conducive at computer
Reason.
In addition, the present embodiment separately provide it is a kind of can be according to based on the TDLAS gas thermometrics detection method for expanding focusing system
Following steps are operated：
The first step：By equipment combustion supervision muzzle in gas flame combustion zone and fixed thereto.
Second step：Equipment back end signal line is connected to and is calculated in corresponding machine equipment.
Third walks：It fixes device and opens power supply, and adjust the work of laser signal generator and laser signal debugger
Laser sends out the start-up operation of specific wavelength laser equipment under the action of laser driver after wavelength.
4th step：Software is handled according to computer thermometric, extracts two path signal zig-zag absorption peak region area, into
Row compares processing operation, obtains combustion field temperature value to be measured.
5th step：The average value that under test gas is taken to burn repeatedly is measured, reduces error, improves precision.
It is relatively high power semiconductor tunable laser with for detection light source that the present invention, which use laser, and light beam is poly- through expanding
It is high to collect optical focus energy, light intensity of scattering and disappearing in transmission process is smaller, so as to preferably to acquire the optical signal being pierced by through combustion field, light
The sensitivity of the electric transducer echo probe under test gas wave band meets the gas band operation needs.Gas temperature measuring equipment is whole
Connection is simple, and easy to operate, the measurement accuracy of real-time processing data is higher, and service life is longer, convenient for small-scale engineering site
Test detection.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (1)
- It is 1. a kind of based on the TDLAS gas thermometric detection devices for expanding focusing system, which is characterized in that the thermometric detection device Two parts are divided into centered on burning gases field；It is light source transmitting terminal positioned at burning gases field side, positioned at burning gases Field opposite side is light source receiving terminal；And burning gases field space is formed by pyroceram (14), and which is provided with burning inspection Survey mouth (8)；The light source transmitting terminal includes：Power supply, first laser device (2a), second laser (2b), laser signal debugger (3), Laser signal generator (4), single mode optical fiber (13), laser bundling device (5), optical fiber collimator (6), laser beam expanding lens barrel (7)；Its In, the first laser device (2a) comes with first laser driver, and the second laser (2b) comes with second laser drive Dynamic device；The light source receiving terminal includes：Planoconvex spotlight (9), integrating sphere (11), the first photodetector, the second photodetector, First photoelectric converter (10a), the second photoelectric converter (10b), photoelectric transformer signal conversion line (12)；The first laser device (2a), second laser (2b), laser signal generator (4), laser signal debugger (3) electricity Source line interface is connected with each other and is uniformly connected to the power supply interface power cord (1) of power supply；The laser signal generator (4) is respectively Connect first laser driver, second laser driver and laser signal debugger (3)；The single mode optical fiber (13) connects respectively Connect first laser device (2a) output port, second laser (2b) output port and laser bundling device (5) input port；It is described The single mode optical fiber that laser bundling device (5) input port connects first laser device (2a) respectively and second laser (2b) respectively transmits (13)；The optical fiber collimator (6) is connected to laser bundling device (5) back end output；Laser beam expanding lens barrel (7) is connected to optical fiber Collimator (6) back end output；The planoconvex spotlight (9) in burning gases field relative to the opposite side of light source transmitting terminal, positioned at light source receiving terminal Front end, and on the exit path in the laser beam expanding lens barrel (7), planoconvex spotlight (9) center and laser beam expanding lens barrel (7) center is coaxial；The integrating sphere (11) is positioned at planoconvex spotlight (9) rear end, and planoconvex spotlight (9) focal position is integrating In ball (11) incidence hole diameter；There are a light inlet and two-way light-emitting window inside integrating sphere (11), according to the first laser device (2a) And second laser (2b) optical maser wavelength difference carry out optical filter light splitting so that by the integrated ball of light beam (11) optical filter into Row light splitting, separating respective frequencies of light has light-emitting window respectively to get；Photoelectricity is each provided at (11) two light-emitting windows of integrating sphere Detector, is divided into the first photodetector and the second photodetector, and the first photodetector connects the first photoelectric converter (10a), the second photodetector connect the second photoelectric converter (10b)；And first photoelectric converter (10a) response wave band with the One laser (2a) service band matches, the second photoelectric converter (10b) response wave band and second laser (2b) operating wave Section matches, and the first photoelectric converter (10a) and the second photoelectric converter (10b) rear end pass through photoelectric transformer signal conversion line (12) computer is connected；Wherein, the optical fiber collimator (6) sends out laser beam, planoconvex spotlight (9), integrating sphere (11) enter light Bore three is in the respective central symmetry of same optical axis.
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| CN106017725B (en) * | 2016-05-26 | 2019-07-09 | 中国人民解放军战略支援部队航天工程大学 | A kind of measuring device suitable for Combustion Flow Field gas 2-d reconstruction |
| 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 |
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| CN204988539U (en) * | 2015-07-13 | 2016-01-20 | 天津津航技术物理研究所 | Gaseous temperature measurement detection device of TDLAS based on beam focusing system expands |
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| CN202453298U (en) * | 2012-01-16 | 2012-09-26 | 无锡迈福光学科技有限公司 | Surface micro-defect detecting device based on laser scattering |
| CN102944942A (en) * | 2012-11-26 | 2013-02-27 | 中国科学院长春光学精密机械与物理研究所 | Laser uniform area light source |
| CN103175634B (en) * | 2013-02-06 | 2015-08-05 | 北京东方计量测试研究所 | Tdlas temperature calibration system |
| CN104330190B (en) * | 2014-10-23 | 2017-04-12 | 中国航天科工集团第三研究院第八三五八研究所 | TDLAS gas temperature measurement detection device based on optical light-splitting system |
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