CN105043589A - TDLAS gas temperature measurement detection method based on beam expanding and focusing system - Google Patents
TDLAS gas temperature measurement detection method based on beam expanding and focusing system Download PDFInfo
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Abstract
The invention belongs to the field of an optical detection technology and specifically relates to a TDLAS gas temperature measurement detection method based on a beam expanding and focusing system. A detection device based on the method is formed by connecting a power source to a laser, a laser driver, a laser signal generator and a laser signal debugger. According to the method, emitted laser light is transmitted through single-mode fiber; two beams of the laser light are combined into one beam of light; after being parallel through an optical fiber collimator, the one beam of light undergoes beam expanding through a beam-expanding lens cone to be emitted; after detecting temperature of gas in combustion in the outside environment, the emitted light passes through a planoconvex lens to be focused to an integrating sphere and a photoelectric detector, and an optical signal is converted into an electrical signal; and a signal transmission line at the rear end of the device is connected to a computer and correlated signal images are processed to calculate the temperature value. Accuracy of measurement results is good. The device is simple to operate and easy to install and detect and is suitable for detecting small indoor and outdoor combustion zones or small-sized industrial flame burning fields. The method provides temperature data support for detecting burning fields.
Description
Technical field
The invention belongs to technical field of optical detection, being specifically related to a kind of TDLAS gas thermometric detection method based on expanding focusing system.
Background technology
Along with the reach of science, the progress of society, in social production process, Product checking technology improves constantly, by the detection means iterative method of original engineering properties to the detection means of photoelectric technology, wherein gas detect is that foreword has the detection means of social market the most instantly, real-time control measurement is carried out to the temperature in gaseous combustion and content, is mainly used in the temperature detection of mini engineering combustion apparatus.Original mechanical measurement temperature device index is lower, and degree of accuracy is low, and measurement range is little, substantially can not meet industrialized high-temperature service requirement.For photoelectric detecting technology, laser detection precision is high, and error is little, and apparatus design debugging is simple and easy, easy and simple to handle, and maintenance period is longer, substantially meets commercial production and detects demand.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how to provide a kind of TDLAS gas thermometric detection method based on expanding focusing system.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of TDLAS gas thermometric detection method based on expanding focusing system, described method is implemented by gas thermometric pick-up unit, and this 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; And space, burning gases field is formed by pyroceram 14, and which is provided with combustion supervision mouth 8;
Described light source transmitting terminal comprises: power supply, the first laser instrument 2a, second laser 2b, laser signal debugger 3, laser signal generator 4, single-mode fiber 13, laser bundling device 5, optical fiber collimator 6, laser beam expanding lens barrel 7; 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: plano-convex lens 9, integrating sphere 11, first photodetector, the second photodetector, the first photoelectric commutator 10a, the second photoelectric commutator 10b, photoelectric transformer signal conversion line 12;
The electric source line interface of described first laser instrument 2a, second laser 2b, laser signal generator 4, laser signal debugger 3 is interconnected and unifies to be connected to the power supply interface power lead 1 of power supply; Described laser signal generator 4 connects the first laser driver, the second laser driver and laser signal debugger 3 respectively; Described single-mode fiber 13 connects the first laser instrument 2a output port, second laser 2b output port and laser bundling device 5 input port respectively; Described laser 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 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;
Described plano-convex lens 9 is arranged in the opposite side of burning gases field relative to light source transmitting terminal, is positioned at the front end of light source receiving end, and is on the exit path of described laser beam expanding lens barrel 7, plano-convex lens 9 center and laser beam expanding lens barrel 7 center coaxial; Described integrating sphere 11 is positioned at plano-convex lens 9 rear end, and plano-convex lens 9 focal position is in integrating sphere 11 light inlet aperture; There are a light inlet and two-way light-emitting window in integrating sphere 11 inside, optical maser wavelength difference according to described first laser instrument 2a and second laser 2b carries out optical filter light splitting, make to carry out light splitting by light beam through integrating sphere 11 optical filter, separating respective frequencies of light has light-emitting window to get separately; At integrating sphere, 11 two light-emitting window places are provided with photodetector separately, are divided into the first photodetector and the second photodetector, and the first photodetector connects the first photoelectric commutator 10a, and the second photodetector connects the second photoelectric commutator 10b; And the first photoelectric commutator 10a response wave band and the first laser instrument 2a service band match, second photoelectric commutator 10b response wave band and second laser 2b service band match, and the first photoelectric commutator 10a is connected computing machine with the second photoelectric commutator 10b rear end by photoelectric transformer signal conversion line 12; Wherein, described optical fiber collimator 6 send laser beam, plano-convex lens 9, integrating sphere 11 light inlet bore three is at same optical axis Central Symmetry separately;
Wherein, described method comprises the steps:
Step S1: combustion supervision mouth 8 be enclosed within burning gases field areas and fix with it;
Step S2: the photoelectric transformer signal conversion line 12 of photoelectric commutator 10 rear end is connected computing machine;
Step S3: after Power supply, described first laser instrument 2a, second laser 2b, laser signal generator 4, laser signal debugger 3 are opened;
Step S4: wavelength, frequency attribute parameter that laser signal generator 4 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 S5: the laser frequency near laser signal debugger 3 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 4; Described laser signal generator 4 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 S6: the Laser Transmission that described first laser instrument 2a and second laser 2b exports by single-mode fiber 13 is to laser bundling device 5;
Step S7: 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 laser bundling device 5;
Step S8: the laser beam sending miniature deformation is carried out refraction correction by collimation lens by optical fiber collimator 6, sends the rear laser beam of collimation in optical fiber collimator 6 rear end;
Step S9: after collimation, laser beam is converted to parallel angle pencil of ray by laser beam expanding lens barrel 7;
Step S10: parallel angle pencil of ray is entering in plano-convex lens 9 after the pyroceram 14 of burning gases field, collimate parallel after angle pencil of ray bundle light beam after by burning gases field there is small deviation, after plano-convex lens 9 refraction condensation, make laser beam again converge in integrating sphere 11;
Step S11: the laser beam of the respective different wave length of two bundles after integrating sphere 11 points of folding bundles;
Step S12: the two-way laser beam focus of the respective different wave length frequency of separating through integrating sphere 11 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 10a, the second photoelectric commutator 10b 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;
Step S13: according to computing machine thermometric process software, extract two path signal zig-zag absorption peak region area, process computing of comparing, obtains combustion field temperature value to be measured;
Step S14: repetitive measurement gets the mean value of gaseous combustion to be measured, to reduce error, improves precision.
(3) beneficial effect
Compared with prior art, TDLAS gas thermometric detection method based on expanding focusing system provided by the invention, the device inside of its foundation adopts high energy semiconductor tunable laser instrument as work light, optical ray is utilized to expand and lens focus principle, detect the temperature of burning gases to be measured, measuring accuracy is high, and equipment debugging is simple and easy, easy and simple to handle.
Beneficial effect of the present invention: adopt high energy semiconductor tunable laser instrument as work light, laser instrument detects at specific fluctuation variable ratio frequency changer, and investigative range is accurately wider, and light beam aggregation is better.Measurement result degree of accuracy is high, and dissipate energy is less, and device is built simple and easy, easy and simple to handle, easy to carry, is applicable to the temperature detection of mini engineering combustion apparatus.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is outside drawing of the present invention.
In figure: 1-power lead; 2a-first laser instrument (carrying the first laser driver); 2b-second laser (carrying the second laser driver); 3-laser signal debugger; 4-laser signal generator; 5-laser bundling device; 6-optical fiber collimator; 7-laser beam expanding lens barrel; 8-combustion supervision mouth; 9-plano-convex lens; 10a-first photoelectric commutator; 10b-second photoelectric commutator; 11-integrating sphere; 12-photoelectric transformer signal conversion line; 13-single-mode fiber; 14-pyroceram; 15-shell.
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
For solving the problem of prior art, the invention provides a kind of TDLAS gas thermometric pick-up unit based on expanding focusing system, as shown in Figures 1 and 2, described thermometric pick-up unit 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; And space, burning gases field is formed by pyroceram 14, and which is provided with combustion supervision mouth 8;
Described light source transmitting terminal comprises: power supply, the first laser instrument 2a, second laser 2b, laser signal debugger 3, laser signal generator 4, single-mode fiber 13, laser bundling device 5, optical fiber collimator 6, laser beam expanding lens barrel 7; 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: plano-convex lens 9, integrating sphere 11, first photodetector, the second photodetector, the first photoelectric commutator 10a, the second photoelectric commutator 10b, photoelectric transformer signal conversion line 12;
The electric source line interface of described first laser instrument 2a, second laser 2b, laser signal generator 4, laser signal debugger 3 is interconnected and unifies to be connected to the power supply interface power lead 1 of power supply; Described laser signal generator 4 connects the first laser driver, the second laser driver and laser signal debugger 3 respectively; Described single-mode fiber 13 connects the first laser instrument 2a output port, second laser 2b output port and laser bundling device 5 input port respectively; Described laser 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 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;
Described plano-convex lens 9 is arranged in the opposite side of burning gases field relative to light source transmitting terminal, is positioned at the front end of light source receiving end, and is on the exit path of described laser beam expanding lens barrel 7, plano-convex lens 9 center and laser beam expanding lens barrel 7 center coaxial; Described integrating sphere 11 is positioned at plano-convex lens 9 rear end, and plano-convex lens 9 focal position is in integrating sphere 11 light inlet aperture, and object all enters integrating sphere 11 after guaranteeing all laser beam line focuses; There are a light inlet and two-way light-emitting window in integrating sphere 11 inside, optical maser wavelength difference according to described first laser instrument 2a and second laser 2b carries out optical filter light splitting, make to carry out light splitting by light beam through integrating sphere 11 optical filter, separating respective frequencies of light has light-emitting window to get separately; At integrating sphere, 11 two light-emitting window places are provided with photodetector separately, are divided into the first photodetector and the second photodetector, and the first photodetector connects the first photoelectric commutator 10a, and the second photodetector connects the second photoelectric commutator 10b; And the first photoelectric commutator 10a response wave band and the first laser instrument 2a groundwork wave band match, second photoelectric commutator 10b response wave band and second laser 2b groundwork wave band match, first photoelectric commutator 10a is connected computing machine with the second photoelectric commutator 10b rear end by photoelectric transformer signal conversion line 12, and transmits switching electrical signals image in a computer in real time; Wherein, the laser beam that described optical fiber collimator 6 sends, plano-convex lens 9, integrating sphere 11 light inlet bore three are at same optical axis Central Symmetry separately, and object ensures that light path system light stable signal is undistorted;
In the course of work, device internal electric source provides voltage for whole detection equipment, the basis of power supply is opened containing the laser instrument of laser driver, laser signal debugger and laser signal generator, wherein laser signal generator setting is given in and relatively detects gas frequency reference value, and the wavelength coverage of frequency and gas emphasis to be measured collection near reference value in laser signal debugger is loaded to sawtooth signal and debugs.Consistent when the light signal that the laser beam after debugging sends and debugging.Laser after single-mode fiber transmission after optical fiber light-emitting window carries out the collimation of light light beam be changed to parallel angle pencil of ray expanding lens barrel transfer, through after the pyroceram of combustion field wall through plano-convex lens Refractive focusing in integrating sphere, light beam is beaten in corresponding photodetector and photoelectric transformer in integrating sphere outlet injection, converts electric signal in a computer to and carries out data acquisition process and calculate gas real time temperature data.
Wherein, rectangular enclosure 15 portion of material of described gas thermometric pick-up unit is chosen for high temperature resistant, and internal components wall surrounding has protecting thermal insulating layer, and device is normally worked under inner normal temperature, and outer refractory prevents gaseous combustion peripheral to be out of shape.
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 is a little more than containing wave band to be measured, and object is in signal tuning wavelength, more can expand the determination value range finding wavelength to be measured to float.
Wherein, 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.
Wherein, in the transmitting procedure of laser, using single mode fiber, and Optical Fiber Transmission is mated with laser instrument, single-mode fiber long transmission distance, stable signal transmission, decays lower slightly, meets needed for through engineering approaches.
Wherein, the optical fiber of two-way laser instrument transmission, through laser bundling device, is combined into the laser of a branch of two kinds of wavelength mode.
Wherein, the fiber exit port of laser bundling device connects laser aligner, and object is that laser beam is emitted as directional light.
Wherein, laser beam expanding lens barrel is connected to laser aligner exit end, and object makes parallel beam be transformed to wider column type light beam, and the effect intensity of assembling focus light is obvious.
Wherein, the port wall both sides in pick-up unit are pyroceram, and but after high-temp combustion, without distortion, refractive index is certain.
Wherein, detect each burning of gas composition spectral line and all will choose corresponding coupling long wavelength laser and carry out combustion supervision to after the debugging of inner light path system after immobilising device and outside frock.
In addition, the gas thermometric detection method implemented according to described gas thermometric pick-up unit comprises the steps:
Step S1: combustion supervision mouth 8 be enclosed within burning gases field areas and fix with it;
Step S2: the photoelectric transformer signal conversion line 12 of photoelectric commutator 10 rear end is connected computing machine;
Step S3: after Power supply, described first laser instrument 2a, second laser 2b, laser signal generator 4, laser signal debugger 3 are opened;
Step S4: wavelength, frequency attribute parameter that laser signal generator 4 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 S5: the laser frequency near laser signal debugger 3 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 4; Described laser signal generator 4 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 S6: the Laser Transmission that described first laser instrument 2a and second laser 2b exports by single-mode fiber 13 is to laser bundling device 5;
Step S7: 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 laser bundling device 5;
Step S8: the laser beam sending miniature deformation is carried out refraction correction by collimation lens by optical fiber collimator 6, sends the rear laser beam of collimation in optical fiber collimator 6 rear end;
Step S9: after collimation, laser beam is converted to parallel angle pencil of ray by laser beam expanding lens barrel 7;
Step S10: parallel angle pencil of ray is entering in plano-convex lens 9 after the pyroceram 14 of burning gases field, collimate parallel after angle pencil of ray bundle light beam after by burning gases field there is small deviation, after plano-convex lens 9 refraction condensation, make laser beam again converge in integrating sphere 11;
Step S11: the laser beam of the respective different wave length of two bundles after integrating sphere 11 points of folding bundles;
Step S12: the two-way laser beam focus of the respective different wave length frequency of separating through integrating sphere 11 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 10a, the second photoelectric commutator 10b 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;
Step S13: according to computing machine thermometric process software, extract two path signal zig-zag absorption peak region area, process computing of comparing, obtains combustion field temperature value to be measured;
Step S14: repetitive measurement gets the mean value of gaseous combustion to be measured, to reduce error, improves precision.
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment
As shown in Figure 1, the invention provides a kind of TDLAS gas thermometric pick-up unit based on expanding focusing system, its inside is made up of power supply, laser instrument 2, laser driver, laser signal generator 4, laser signal debugger 3, single-mode fiber, light bundling device, optical fiber collimator 6, laser beam expanding lens barrel 7, pyroceram 14, plano-convex lens 9, integrating sphere 11, photodetector, photoelectric commutator relevant connection.Inner laser device, 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 with optical fiber collimator, optical fiber collimator exit end is connected with laser beam expanding lens barrel, and lock fixed fiber collimating apparatus and laser beam expanding lens barrel, pyroceram protection port two side is equipped with, plano-convex lens is placed after port, position, lens center consistent with optical fiber collimator and laser beam expanding lens barrel center (coaxial) is also fixing, in integrating sphere, light inlet position is placed on plano-convex lens rear end and is placed in its plano-convex lens focal position and center, light inlet footpath and position, lens center and optical fiber collimator and laser beam expanding lens barrel center three consistent (coaxial), and fixing integrating sphere.The photosensitive unit part of integrating sphere two light-emitting window and two photodetectors is connected to a fixed, single unit system is inner to be determined rear fixing with outside frock position, two data-signal conversion lines in the photoelectric transformer of device end are connected with computer equipment, complete total system and connect.
In the present embodiment, the laser instrument that this device is taked is relatively high power semiconductor tunable laser instrument, energy is higher, effectively passed burning region to be measured in the detection, laser shape to be detected is broadened into tubular by laser beam expanding lens barrel, be conducive to large area provides higher-energy signal to the receiving trap by combustion field light beam convergence acceptance point by plano-convex lens, and inner product bulb separation beam splitter and photoelectric transformer work respective range match simultaneously, gather acquisition signal and be conducive to computer disposal.
In addition, the present embodiment separately provides a kind of TDLAS gas thermometric detection method based on expanding focusing system can operate according to following steps:
The first step: equipment combustion supervision muzzle is also fixed with it in gas flame combustion zone.
Second step: equipment back end signal line is connected to and calculates in corresponding machine equipment.
3rd step: fix device power-on, and after regulating the operation wavelength of laser signal generator and laser signal debugger, laser instrument sends specific wavelength laser equipment and starts working under the effect of laser driver.
4th step: according to computing machine thermometric process software, extract two path signal zig-zag absorption peak region area, process computing of comparing, obtains combustion field temperature value to be measured.
5th step: repetitive measurement gets the mean value of gaseous combustion to be measured, reduces error, improves precision.
The present invention adopts laser instrument to be that relatively high power semiconductor tunable laser instrument is with being detection light source, light beam is high through expanding gathering optical focus energy, light intensity of scattering and disappearing in transmitting procedure is less, thus for better to gather the light signal passed through combustion field, the sensitivity of this gas wave band to be measured of photoelectric transformer echo probe meets this gas band operation needs.Gas temperature measuring equipment integrated connection is simple and easy, simple to operate, and the measuring accuracy of real-time processing data is higher, and life cycle is longer, is convenient to engineering site test on a small scale and detects.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (1)
1., based on the TDLAS gas thermometric detection method expanding focusing system, it is characterized in that, described method is implemented by gas thermometric pick-up unit, and this 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; And space, burning gases field is formed by pyroceram (14), and which is provided with combustion supervision mouth (8);
Described light source transmitting terminal comprises: power supply, the first laser instrument (2a), second laser (2b), laser signal debugger (3), laser signal generator (4), single-mode fiber (13), laser bundling device (5), optical fiber collimator (6), laser beam expanding lens barrel (7); 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: plano-convex lens (9), integrating sphere (11), the first photodetector, the second photodetector, the first photoelectric commutator (10a), the second photoelectric commutator (10b), photoelectric transformer signal conversion line (12);
The electric source line interface of described first laser instrument (2a), second laser (2b), laser signal generator (4), laser signal debugger (3) is interconnected and unifies to be connected to the power supply interface power lead (1) of power supply; Described laser signal generator (4) connects the first laser driver, the second laser driver and laser signal debugger (3) respectively; Described single-mode fiber (13) connects the first laser instrument (2a) output port, second laser (2b) output port and laser bundling device (5) input port respectively; Described laser bundling device (5) input port connects the single-mode fiber (13) of the first laser instrument (2a) and the respective transmission of second laser (2b) respectively; Described 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;
Described plano-convex lens (9) 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 laser beam expanding lens barrel (7), plano-convex lens (9) center and laser beam expanding lens barrel (7) center coaxial; Described integrating sphere (11) is positioned at plano-convex lens (9) rear end, and plano-convex lens (9) focal position is in integrating sphere (11) light inlet aperture; There are a light inlet and two-way light-emitting window in integrating sphere (11) inside, optical maser wavelength difference according to described first laser instrument (2a) and second laser (2b) carries out optical filter light splitting, make to carry out light splitting by light beam through integrating sphere (11) optical filter, separating respective frequencies of light has light-emitting window to get separately; At integrating sphere, (11) two light-emitting window places are provided with photodetector separately, be divided into the first photodetector and the second photodetector, first photodetector connects the first photoelectric commutator (10a), and the second photodetector connects the second photoelectric commutator (10b); And the first photoelectric commutator (10a) response wave band and the first laser instrument (2a) service band match, second photoelectric commutator (10b) response wave band and second laser (2b) service band match, and the first photoelectric commutator (10a) is connected computing machine with the second photoelectric commutator (10b) rear end by photoelectric transformer signal conversion line (12); Wherein, described optical fiber collimator (6) send laser beam, plano-convex lens (9), integrating sphere (11) light inlet bore three is at same optical axis Central Symmetry separately;
Wherein, described method comprises the steps:
Step S1: combustion supervision mouth (8) be enclosed within burning gases field areas and fix with it;
Step S2: the photoelectric transformer signal conversion line (12) of photoelectric commutator (10) rear end is connected computing machine;
Step S3: after Power supply, described first laser instrument (2a), second laser (2b), laser signal generator (4), laser signal debugger (3) are opened;
Step S4: wavelength, frequency attribute parameter that laser signal generator (4) 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 S5: laser signal debugger (3) needs the laser wavelength range of emphasis collection to carry out loading the debugging of 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 (4); Described laser signal generator (4) 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) start the laser sending required wavelength;
Step S6: the Laser Transmission that described first laser instrument (2a) and second laser (2b) export by single-mode fiber (13) is to laser bundling device (5);
Step S7: the laser that two-way single-mode fiber (13) transmission comes by laser bundling device (5) closes bundle through front end and is combined into the laser beam of a branch of two kinds of wavelength mode in rear end;
Step S8: the laser beam sending miniature deformation is carried out refraction correction by collimation lens by optical fiber collimator (6), sends the rear laser beam of collimation in optical fiber collimator (6) rear end;
Step S9: after collimation, laser beam is converted to parallel angle pencil of ray by laser beam expanding lens barrel (7);
Step S10: parallel angle pencil of ray is entering in plano-convex lens (9) after the pyroceram (14) of burning gases field, collimate parallel after angle pencil of ray bundle light beam after by burning gases field there is small deviation, after plano-convex lens (9) refraction condensation, make laser beam again converge in integrating sphere (11);
Step S11: the laser beam of the respective different wave length of two bundles after integrating sphere (11) point folding bundle;
Step S12: the two-way laser beam focus of the respective different wave length frequency of separating through integrating sphere (11) to luminous point enter into the first photodetector and the second photodetector enter photosensitive first hole, the first photoelectric commutator (10a) through the first photodetector, the second photodetector and its rear end, the second photoelectric commutator (10b) carry out light-to-current inversion separately, light signal is changed into electric signal export, in back-end computer, carry out data acquisition process calculate gas real time temperature data;
Step S13: according to computing machine thermometric process software, extract two path signal zig-zag absorption peak region area, process computing of comparing, obtains combustion field temperature value to be measured;
Step S14: repetitive measurement gets the mean value of gaseous combustion to be measured, to reduce error, improves precision.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141524A (en) * | 2019-12-02 | 2020-05-12 | 中国人民解放军战略支援部队航天工程大学 | Measuring device for measuring combustion field gas parameters |
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