CN105466491A - Imaging-type combustion temperature and concentration measurement device based on dual-channel molecule optical filtering - Google Patents
Imaging-type combustion temperature and concentration measurement device based on dual-channel molecule optical filtering Download PDFInfo
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Abstract
The invention provides an imaging-type combustion temperature and concentration measurement device based on dual-channel molecule optical filtering. The invention discloses an imaging-type combustion measurement device based on a dual-channel molecule optical filtering technology, and the device relates to measurement of combustion temperatures and concentrations. The device is composed of an optical receiving unit (1), a total beam separation lens (2), a first channel molecule optical filtering imaging detection assembly (3), a second channel molecule optical filtering imaging detection assembly (4) and a data processing and image display unit (5). A dual-channel molecule optical filtering unit is composed of the two sets of molecule optical filtering assemblies which are separately used to acquire two groups of radiation spectrums with different temperature sensitivity coefficients and used for inversion of combustion filed temperatures and component concentrations. The device disclosed by the invention has the advantages that an imaging-type combustion diagnosis device based on the dual-channel molecule optical filtering technology is capable of hyper-spectral resolution, hyper-time resolution, hyper-space resolution and non-contact online measurement, so that the imaging-type combustion temperature and concentration measurement device based on the dual-channel molecule optical filtering disclosed by the invention has the advantages of high measurement accuracy, high stability and reliability in work, high resistance to interference, and a capability of simultaneously obtaining a CO concentration and temperature in a combustion area, etc.
Description
Technical field
The present invention relates to the measurement of temperature of combustion concentration, particularly relate to the imaging type combustion diagnosis device that ultra-narrow band molecule filters.
Background technology
The demand of fast development to the energy of national economy is increasing, and at present, world energy supplies about has 80% to be all produced by burning, thus, realizes the conversion of high-level efficiency heat in combustion significant for energy-conserving and environment-protective.Research shows, the flame structure of combustion zone and the working condition of the combustion parameter such as temperature, concentration of component and combustion system, burning efficiency, products of combustion (comprising pollutant effulent) have substantial connection.Combustion diagnosis technology, especially in combustion can in real time, the non-contact optical diagnostic techniques of the combustion parameter such as online, the temperature that quantitatively obtains combustion zone and concentration of component, play vital effect in fields such as large-sized boiler combustion system, large-scale gas turbine, Aero-Space engines, control combustion process, raising burning efficiency, decreasing pollution are produced to discharge, guarantee that combustion system safety is significant.
Imaging type combustion diagnosis method can obtain temporal information and the spatial information of combustion parameter simultaneously when not disturbing combustion process, the duty in reactive combustion district directly perceived is applied more extensive.Traditional imaging type combustion diagnosis device mainly contains based on the Two-color Measure Thermometer of blackbody radiation principle and thermal infrared imager, based on the combustion diagnosis technology of Fourier transform infrared imaging spectrometer, the Tomographic Diagnosis Technology etc. based on laser light scattering and Optical Absorption Method.Document (" DevelopmentofTwo-ColorThermometerUsingaColorCCDCameraand MeasurementTechnologyofTuyereandRacewayofBlastFurnace ", Tetsutohagane-journaloftheIronandSteelInstituteofJapan, 2013, 99 (5): 10-17) Two-color Measure Thermometer and colorful CCD camera is adopted to gather the heat radiation images data of combustion zone, utilize blackbody radiation gross energy and the direct funtcional relationship of its thermodynamic temperature, inverting obtains the Temperature Distribution of combustion zone, but during the method Inversion Calculation temperature of combustion, grey body hypothesis need be done to tested region, temperature retrieval result and actual conditions are made to there is comparatively big error, document (" Mid-IRhyperspectralimagingoflaminarflamesfor2-Dscalarval ues ", OpticsExpress, 2014, 22 (18): 21600 – 21617) adopt Fourier transform infrared imaging spectrometer to carry out combustion diagnosis, the spectral information that Fourier transform obtains flame is carried out by the interference image gathering combustion zone, inverting draws temperature, the combustion parameters such as concentration of component, imaging technique combines with spectral technique by the method, both the flame structure of combustion zone can intuitively have been obtained, again can according to characteristic spectrum identification products of combustion and by correcting measuring production concentration and temperature of combustion, but due to imaging spectrometer complex structure, need optical scanning, its optical stability and spectral resolution can not be taken into account simultaneously, mutually restrict between detection sensitivity and optical property, thus, there is many engineering challenges in the combustion diagnosis technology based on Fourier transform infrared imaging spectrometer in industry spot application, document (" Raman/RayleighscatteringandCO-LIFmeasurementsinlaminaran dturbulentjetflamesofdimethylether ", CombustionandFlame, 2012, 159 (8): 2533 – 2562) utilize laser and combustion zone gaseous substance to interact the Rayleigh scattering produced, Raman scattering and laser-induced fluorescence (LIF) effect obtain combustion zone information of flow, Rayleigh scattering effect can obtain temperature and velocity information, Raman scattering effect can obtain concentration and temperature information, utilize laser-induced fluorescence (LIF) effect can obtain concentration of component information, Comparatively speaking, laser light scattering techniques has lot of advantages, such as can non-contact measurement with reduce or avoid pneumatic, hot or chemical disturbance, high temperature and rugged surroundings can be born, there is regular hour and spatial resolving power, the information of flow such as temperature and concentration of component can be obtained, but this technology also has very large limitation, the mainly strong bias light in combustion zone, the interference of laser induced effect and the spuious scattering of laser etc. is more difficult to be avoided, and system complex, apparatus expensive.
Molecule optical filtering technique utilizes the residual quantity absorption of gas molecule to flashlight to realize optical filtering object, this technology not only has the imaging capability of high spectral resolution, high time resolution and high-space resolution, and effectively can suppress spuious background radiation noise, especially can the infrared radiation signal of filtering interfering gas, be applied to the fields such as the satellite remote sensing of atmospheric greenhouse gas, gas pipeline leakage Scout and survey on-board, hazardous gas spillage early warning.Document (" Real-timegas-correlationimagingemployinghermalbackground radiation ", OpticsExpress, 2000,6 (4): 92 – 103) utilize molecule filtering device and thermal infrared imager to detect the leakage of ammonia, ethene and methane gas, sensitivity is up to 200ppm × m.
Summary of the invention
The object of the invention is: a kind of imaging type combustion measurement device based on binary channels molecule optical filtering technique is provided, the binary channels molecule filter unit of this device adopts two cover molecule filtering assemblies, obtain the different two groups of radiation spectrums of temperature-sensitivity coefficient respectively, for the inverting of combustion field temperature and concentration of component.Advantage of the present invention is: because the imaging type combustion diagnosis device of binary channels molecule optical filtering technique has high spectral resolution, high time resolution, the ability of high-space resolution and the ability of non-contact forecasting, the present invention is had, and measuring accuracy is high, working stability is reliable, antijamming capability is strong, can obtain the advantage such as CO concentration and temperature information of combustion zone simultaneously.
For achieving the above object, the present invention adopts following technical scheme:
1, structure
A kind of imaging type combustion measurement device based on binary channels molecule optical filtering technique is made up of optical receiver unit, total beam splitter, first passage molecule optical filtering imaging detection assembly, second channel molecule optical filtering imaging detection assembly and data processing and image-display units;
Receive optical unit and adopt telescope, total beam splitter is placed in the output light path of optical receiver unit, and is 45° angle with telescopical optical axis, and the transmittance and reflectance light splitting ratio of total beam splitter is 50:50;
First passage molecule optical filtering imaging detection assembly is made up of the first beam splitter, the first absorption molecule bubble, the first catoptron, the first reference molecule bubble, the second catoptron, the first light combination mirror, the first optical filter, the first imaging len and the first infra-red imaging array, first beam splitter is positioned in the reflected light light path of total beam splitter, and it is parallel with total beam splitter, the first absorption molecule bubble and the first catoptron is placed successively in first beam splitter transmitted light light path, the first reference molecule bubble and the second catoptron is placed successively in reflected light light path, the first light combination mirror is placed in the reflected light light path intersection district of the first catoptron and the second catoptron, first light combination mirror is parallel with the first beam splitter, the transmittance and reflectance light splitting ratio of the first light combination mirror is 50:50, the conjunction bundle light direction of the first light combination mirror places the first optical filter successively, first imaging len and the first infra-red imaging array, first infra-red imaging array is positioned on the focal plane of the first imaging len, first catoptron and the second catoptron are all small angle with the first beam splitter, make the right half of imaging of absorption light at the first infra-red imaging array of the first catoptron reflection, the reference light that second catoptron reflects is in the left half of imaging of the first infra-red imaging array, the first effective air chamber length absorbing molecule bubble is 4cm, is filled with the CO gas of 0.1atm in bubble, and effective air chamber length of the first reference bubble is 4cm, is filled with the N2 gas of 1atm in bubble, the spectrum that the centre wavelength of the first optical filter is 4.76 μm, transmitted spectrum bandwidth 0.1 μm, transmission spectral pattern are the first filter transmission,
Second channel molecule optical filtering imaging detection assembly is made up of the second beam splitter, the second absorption molecule bubble, the 3rd catoptron, the second reference molecule bubble, the 4th catoptron, the second light combination mirror, the second optical filter, the second imaging len and the second infra-red imaging array, second beam splitter is positioned in the reflected light light path of total beam splitter, and parallel with total beam splitter, place the second absorption molecule bubble and the 3rd catoptron in second beam splitter transmitted light light path successively, in reflected light light path, place the second reference molecule bubble and the 4th catoptron successively, the second light combination mirror is placed in the reflected light light path intersection district of the 3rd catoptron and the 4th reflection, second light combination mirror is parallel with the second beam splitter, the transmittance and reflectance light splitting ratio of the second light combination mirror is 50:50, the conjunction bundle light direction of the second light combination mirror places the second optical filter successively, second imaging len and the second infra-red imaging array, second infra-red imaging array is positioned on the focal plane of the second imaging len, 3rd catoptron and the 4th catoptron are all small angle with the second beam splitter, make the right half of imaging of absorption light at the second infra-red imaging array of the second catoptron reflection, the reference light that 4th catoptron reflects is in the left half of imaging of the second infra-red imaging array, the second effective air chamber length absorbing molecule bubble is 4cm, is filled with the CO gas of 0.3atm in bubble, effective air chamber length of the second reference bubble is 4cm, is filled with the N of 1atm in bubble
2gas, the spectrum that the centre wavelength of the second optical filter is 4.9 μm, transmitted spectrum bandwidth 0.1 μm, transmission spectral pattern are the second filter transmission,
Data processing and image-display units are made up of image data acquiring module, image data processing module and image display; The view data output terminal of the first infra-red imaging array and the second infra-red imaging array is connected respectively to the data input pin of image data acquiring module, the data output end of image data acquiring module is connected to the data input pin of image data processing module, and the data output end of image data processing module is connected to the data input pin of image display.
The invention has the advantages that:
1, precision is high, highly sensitive.The molecule optical filtering technique that this combustion diagnosis device adopts is a kind of optical filtering means with high spectral resolution ability, there is pectination transmissison characteristic, both can obtain the strength information of many transition spectral lines simultaneously, effectively can suppress again the clutter noise between transition spectral line, make detection system have higher signal to noise ratio (S/N ratio); In addition the present invention utilizes the temperature susceplibility that turns transition spectral line of shaking of molecule to realize combustion parameter to obtain, and selected transition bands of a spectrum band is the fundamental transition of molecule, spectral line strength ratio general frequency transition bands of a spectrum strong tens even several thousand times; This combustion diagnosis device is made to have higher precision and sensitivity.
2, antijamming capability is strong.Molecule filtering assembly is made up of arrowband infrared fileter and molecule filtering device, there is pectination transmissison characteristic, both the heat radiated noise of the combustion system self outside narrow band pass filter band can have been suppressed, again can the infrared radiation interference of high temperature stray gas in filtering optical filter band, compared with thermal infrared imager and Two-color Measure Thermometer, this combustion diagnosis device has stronger environment resistant interference performance.
3, can imaging, there is spatial resolving power.This combustion diagnosis device imaging technique that filtered by molecule combines with infrared thermal imaging technique, temperature field and the concentration field information of combustion zone can be obtained simultaneously, compared with the Tomographic Diagnosis Technology based on laser light scattering method, this combustion diagnosis device has higher spatial resolving power.
4, working stability is reliable.This combustion diagnosis device is using the heat radiation of combustion system self as signal source, molecule optical filtering image-forming assembly is adopted to obtain the meticulous spectral information of combustion zone, with Infrared Imaging Spectrometer and based on laser light scattering method Tomographic Diagnosis Technology compared with, the simple temperature of this apparatus structure, critical component is little by environmental interference such as temperature disturbances, has the reliable advantage of working stability.
5, non-contact forecasting.During this combustion diagnosis device busy, without the need to catalytic combustion region, can not produce any interference to combustion process, the combustion parameter obtained does not affect by detection process, can the real work state of reactive combustion system, and can realize On-line sampling system.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the imaging type combustion measurement device based on binary channels molecule optical filtering technique.
Wherein: 1 optical receiver unit, 2 total beam splitters, 3 first passage molecule optical filtering imaging detection assemblies, 4 second channel molecule optical filtering imaging detection assemblies, 5 data processings and image-display units.
Fig. 2 is the structural representation of first passage molecule optical filtering imaging detection assembly.
Wherein: 2 total beam splitters, 3 first passage molecule optical filtering imaging detection assemblies, 5 data processings and image-display units, 31 first beam splitters, 32 first absorb that molecule steeps, 33 first catoptrons, 34 first reference molecules steep, 35 second catoptrons, 36 first light combination mirrors, 37 first optical filters, 38 first imaging lens, 39 first infra-red imaging arrays.
Fig. 3 is combustion zone image formed by the first infra-red imaging array.
Wherein: 39 first infra-red imaging arrays, 391 first absorption images, 392 first reference pictures.
Fig. 4 is the structural representation of second channel molecule optical filtering imaging detection assembly.
Wherein: 2 total beam splitters, 4 second channel molecule optical filtering imaging detection assemblies, 5 data processings and image-display units, 41 second beam splitters, 42 second absorb that molecule steeps, 43 the 3rd catoptrons, 44 second reference molecules steep, 45 the 4th catoptrons, 46 second light combination mirrors, 47 second optical filters, 48 second imaging lens, 49 second infra-red imaging arrays.
Fig. 5 is the structural representation of data processing and image-display units.
Wherein: 3 first passage molecule optical filtering imaging detection assemblies, 4 second channel molecule optical filtering imaging detection assemblies, 5 data processings and image-display units, 51 image data acquiring modules, 52 image data processing module, 53 image display.
Fig. 6 is the imaging type temperature sensing schematic diagram of binary channels molecule optical filtering technique.
Wherein: the Transition Spectra of shaking-turn of CO molecule during Transition Spectra of shaking-turn, the 64 temperature T=1200K of CO molecule when 61 first filter transmission spectrum, 62 second filter transmission spectrum, 63 temperature T=800K.
Fig. 7 is CO spectrum integral intensity and the ratio variation with temperature curve thereof of two passages.
Wherein: the ratio variation with temperature curve of the change curve of 71 first passage CO spectrum integral intensity temperature, the change curve of 72 second channel CO spectrum integral intensity temperature, the CO spectrum integral intensity of 73 two passages.
Fig. 8 is the change curve of first passage CO spectrum integral intensity concentration under different temperatures.
Wherein: the change curve of the first passage CO spectrum integral intensity concentration under the change curve of first passage CO spectrum integral intensity concentration during 81 temperature T=800K during change curve, the 82 temperature T=1000K of first passage CO spectrum integral intensity concentration, 83 temperature T=1200K.
Fig. 9 is key component in combustion zone and infrared radiation spectrum thereof.
Wherein: the infrared radiation spectrum of 91CO gas, 92CO
2the infrared radiation spectrum of gas, 93H
2the infrared radiation spectrum of O gas.
Figure 10 is CO radiation through the transmission spectral line group of the first optical filter and the second optical filter.
Wherein: the equivalent transmission spectral pattern of 101 first passage molecule filtering assemblies, the equivalent transmission spectral pattern of 102 second channel molecule filtering assemblies.
Figure 11 is the filter effect of molecule optical filtering imaging detection assembly.
Wherein: the infrared radiation spectrum of the 111 CO gases filtered without molecule, 112 H filtered without molecule
2infrared radiation spectrum, 114 H after molecule filters of infrared radiation spectrum, 113 CO gas after molecule filters of O gas
2the infrared radiation spectrum of O gas.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
1, structure
As shown in Figure 1, a kind of imaging type combustion diagnosis device based on binary channels molecule optical filtering technique is made up of optical receiver unit 1, total beam splitter 2, first passage molecule optical filtering imaging detection assembly 3, second channel molecule optical filtering imaging detection assembly 4 and data processing and image-display units 5.
Receive optical unit 1 and adopt telescope, this telescope can adopt Galilean type telescope or keplerian telescope or Newtonian telescope etc., and these telescopical receiving spectrums cover 4 ~ 5 μm.
Total beam splitter 2 is placed in the output light path of optical receiver unit 1, and is 45° angle with telescopical optical axis, and the transmittance and reflectance light splitting ratio of total beam splitter 2 is 50:50.
As shown in Figure 2, first passage molecule optical filtering imaging detection assembly 3 is made up of first beam splitter 31, first absorption molecule bubble 32, first catoptron 33, first reference molecule bubble the 34, second catoptron 35, first light combination mirror 36, first optical filter 37, first imaging len 38 and the first infra-red imaging array 39.
Wherein, the first beam splitter 31 is positioned in the reflected light light path of total beam splitter 2, and parallel with total beam splitter 2.Place the first absorption molecule bubble 32 and the first catoptron 33 in first beam splitter 31 transmitted light light path successively, in reflected light light path, place the first reference molecule bubble 34 and the second catoptron 35 successively, the first light combination mirror 36 is placed in the reflected light light path intersection district of the first catoptron 33 and the second catoptron 35, first light combination mirror 36 is parallel with the first beam splitter 31, the transmittance and reflectance light splitting ratio of the first light combination mirror 36 is 50:50, the conjunction bundle light direction of the first light combination mirror 36 places the first optical filter 37 successively, first imaging len 38 and the first infra-red imaging array 39, first infra-red imaging array 39 is positioned on the focal plane of the first imaging len 38, first catoptron 33 and the second catoptron 35 all with the first beam splitter 31 in small angle, the absorption light that first catoptron 33 is reflected is in the right half of imaging of the first infra-red imaging array 39, the reference light that second catoptron 35 reflects is in the left half of imaging of the first infra-red imaging array 39, as shown in Figure 3, 391 be wherein the image of right one side of something in figure, 392 is the image of left one side of something.
The above-mentioned first effective air chamber length absorbing molecule bubble 32 is 4cm, is filled with the CO gas of 0.1atm in bubble; Effective air chamber length of the first reference bubble 34 is 4cm, is filled with the N2 gas of 1atm in bubble; The centre wavelength of the first optical filter 37 is 4.76 μm, transmitted spectrum bandwidth 0.1 μm, transmission spectral pattern are the first filter transmission spectrum 61.
As shown in Figure 4, second channel molecule optical filtering imaging detection assembly 4 is made up of the second beam splitter 41, second absorption molecule bubble the 42, the 3rd catoptron 43, second reference molecule bubble the 44, the 4th catoptron 45, second light combination mirror 46, second optical filter 47, second imaging len 48 and the second infra-red imaging array 49.
Wherein, the second beam splitter 41 is positioned in the reflected light light path of total beam splitter 2, and parallel with total beam splitter 2.Place the second absorption molecule bubble 42 and the 3rd catoptron 43 in second beam splitter 41 transmitted light light path successively, in reflected light light path, place the second reference molecule bubble 44 and the 4th catoptron 45 successively, the second light combination mirror 46 is placed in the reflected light light path intersection district of the 3rd catoptron 43 and the 4th catoptron 45, second light combination mirror 46 is parallel with the second beam splitter 41, the transmittance and reflectance light splitting ratio of the second light combination mirror 46 is 50:50, the conjunction bundle light direction of the second light combination mirror 46 places the second optical filter 47 successively, second imaging len 48 and the second infra-red imaging array 49, second infra-red imaging array 49 is positioned on the focal plane of the second imaging len 48, 3rd catoptron 43 and the 4th catoptron 45 all with the second beam splitter 41 in small angle, the absorption light that second catoptron 43 is reflected is in the right half of imaging of the second infra-red imaging array 49, the reference light that 4th catoptron 45 reflects is in the left half of imaging of the second infra-red imaging array 49.
The second effective air chamber length absorbing molecule bubble 42 is 4cm, is filled with the CO gas of 0.3atm in bubble; Effective air chamber length of the second reference bubble 44 is 4cm, is filled with the N of 1atm in bubble
2gas.The centre wavelength of the second optical filter 47 is 4.9 μm, transmitted spectrum bandwidth 0.1 μm, transmission spectral pattern are the second filter transmission spectrum 62.
As shown in Figure 5, data processing and image-display units 5 are made up of image data acquiring module 51, image data processing module 52 and image display 53.The view data output terminal of the first infra-red imaging array 39 and the second infra-red imaging array 49 is connected respectively to the data input pin of image data acquiring module 51, the data output end of image data acquiring module 51 is connected to the data input pin of image data processing module 52, and the data output end of image data processing module 52 is connected to the data input pin of image display 53.
2, to the detection principle of pure CO gas temperature and concentration
For pure CO gas, in the transition spectral line group (4.67 μm ~ 5.0 μm) that its P props up each bar spectral line intensity temperature and change, illustrate the Transition Spectra 64 of CO molecule under the Transition Spectra 63 of CO molecule under temperature T=800K and temperature T=1200K in Fig. 6.
Utilize the first optical filter 37 4.76 ± 0.05 μm of spectral coverages are selected through, other spectrum is suppressed, obtain the CO transmission spectral line group 101 of the first optical filter, as shown in Figure 10, the total mark intensity of this spectral line group reduces along with the increase of temperature, the change curve 71 of first passage CO spectrum integral intensity temperature as shown in Figure 7.
Utilize the second optical filter 47 4.9 ± 0.05 μm of spectral coverages are selected through, other spectrum is suppressed, obtain the CO transmission spectral line group 102 of the second optical filter, as shown in Figure 10, the total mark intensity of this spectral line group increases along with the increase of temperature, as the change curve 72 of the second channel CO spectrum integral intensity temperature in Fig. 7.
By corresponding for change curve 71 pointwise of the first passage CO spectrum integral intensity temperature change curve 72 divided by second channel CO spectrum integral intensity temperature, obtain the ratio variation with temperature curve 73 of the CO spectrum integral intensity of two passages.Thus, detect the CO spectrum integral intensity of two passages respectively, the temperature of CO can be obtained.
Under the temperature conditions determined, the increase of two channel C O spectrum integral intensity CO concentration and increasing, Fig. 8 illustrates the change curve of the first passage CO spectrum integral intensity concentration under different temperatures.Thus, after the ratio of the CO spectrum integral intensity according to two passages obtains temperature, the concentration of CO can be obtained according to the CO spectrum integral intensity of first passage.
3, the molecule optical filtering measuring principle of combustion zone
In combustion zone, except there is CO, also has CO
2, H
2the components such as O, these components all have infrared spectral radiant, as shown in Figure 9, wherein comprise infrared radiation spectrum 91, the CO of CO gas
2the infrared radiation spectrum 92 of gas and H
2the infrared radiation spectrum 93 of O gas.Severe jamming to CO temperature and measurement of concetration, even causes and cannot measure by the existence of the radiation spectrum beyond CO.For this reason, the method that the present invention adopts molecule to filter is by the radiation spectrum filtering beyond CO, and reach the object that the optical filtering of CO signal is extracted, final acquisition only comprises the image of CO strength distributing information.The principle that CO molecule filters is as follows:
In first passage molecule optical filtering probe assembly 3: the first reference picture 392 be through first reference molecule bubble 34 light beam formed, first reference molecule bubble 34 in be filled with N
2molecule, the spectrum of 4.76 ± 0.05 μm of spectral coverages is not had an impact, so contain all spectral informations of 4.76 ± 0.05 μm of spectral coverages in the first reference picture 392, as shown in figure 11, both the infrared radiation spectrum 111 containing the CO gas filtered without molecule, also containing the H filtered without molecule
2the infrared radiation spectrum 112 of O gas, etc.; And the image of the first absorption image 391 is through the light beam formation of the first absorption molecule bubble 32, CO gas is filled with in first absorption molecule bubble 32, CO spectrum in 4.76 ± 0.05 μm of spectral coverages in light beam absorbs by CO gas completely, therefore, the spectral signal of CO has been lacked completely in the first absorption image 391.
After first absorption image 391 and the first reference picture 392 gather via image data acquiring module 51, subtracted each other corresponding with the first absorption image 391 for the signal intensity of each pixel of the first reference picture 392 by image data processing module 52 again, the the first error image A obtained, only has the image of the CO intensity distributions in 4.76 ± 0.05 μm of spectral coverages in the first error image A.As shown in figure 11, after filtering there is the interference spectrum of other component in the infrared radiation spectrum 113 of CO gas hardly, reaches the object that CO molecule optical filtering spectrum is purified.
In second channel molecule optical filtering probe assembly 2: the method being obtained the second error image B by the second absorption image and the second reference picture is identical with first passage molecule optical filtering probe assembly 1 principle, and detailed process repeats no more.The image of the CO intensity distributions in 4.9 μm ± 0.05 μm spectral coverage is only had in second error image B.
On first error image A, the signal intensity of each pixel is combustion zone radiant light via first passage CO spectrum integral intensity, equally, on second error image B, the signal intensity of each pixel is combustion zone radiant light via second channel CO spectrum integral intensity, be divided by corresponding with the second error image B for the signal intensity of each pixel of the first error image A by image data processing module 52 again, according to the ratio variation with temperature curve 73 of the CO spectrum integral intensity of two passages, the temperature of the CO gas that each pixel detects can be obtained, obtain the temperature distribution image of combustion zone thus.The change curve of CO spectrum integral intensity concentration under different temperatures according to Fig. 8 again, the CO spectrum integral intensity obtained according to first passage obtains the concentration of CO, obtains the CONCENTRATION DISTRIBUTION image of combustion zone thus.
4, workflow
The gaseous product of combustion zone gives off stronger infrared spectrum under the high temperature conditions, these spectral informations transfer to total beam splitter 2 after optical receiver unit 1 receives, reflection and transmission two-way light beam is divided into by equal proportion, reflected light path arrives first passage molecule optical filtering imaging detection assembly 3, transmitted light path arrives second channel molecule optical filtering imaging detection assembly 4, both picture signal through data line transfer to data processing and image-display units 5 carries out data processing and image shows.
The reflected light path of total beam splitter 2 is after arrival first passage molecule optical filtering imaging detection assembly 3, first reflection and transmission two-way light beam is divided into by the first beam splitter 31, transmitted light path absorbs molecule bubble the 32, first catoptron 33 by first successively, arrive the first light combination mirror 36, its reflecting part, by after the first optical filter 37 and the first imaging len 38, obtains the first absorption image 391 at right one side of something of the first infra-red imaging array 39; The reflected light path of the first beam splitter 31 is successively by first reference molecule bubble the 34, second catoptron 35, arrive the first light combination mirror 36, its transmissive portion, by after the first optical filter 37 and the first imaging len 38, obtains the first reference picture 392 at left one side of something of the first infra-red imaging array 39.
The transmitted light path of total beam splitter 2 is after arrival second channel molecule optical filtering imaging detection assembly 4, first reflection and transmission two-way light beam is divided into by the second bundle mirror 41, reflected light path absorbs molecule bubble the 42, the 3rd catoptron 43 by second successively, arrive the second light combination mirror 46, its reflecting part, by after the second optical filter 47 and the second imaging len 48, obtains the first absorption image at right one side of something of the second infra-red imaging array 49; The transmitted light path of the second beam splitter 41 is successively by the second reference molecule bubble the 44, the 4th catoptron 45, arrive the second light combination mirror 46, its transmissive portion, by after the second optical filtering 47 and the second imaging len 48, obtains the second reference picture at left one side of something of the second infra-red imaging array 49.
The absorption image that first infra-red imaging array 39 and the second infra-red imaging array 49 obtain and reference picture, after image data acquiring module 51 gathers, after being processed, flow to image display 53 and carry out combustion position and directly show by image data processing module 52.
Claims (2)
1. the imaging type combustion measurement device based on binary channels molecule optical filtering technique, it is characterized in that, this device is made up of optical receiver unit (1), total beam splitter (2), first passage molecule optical filtering imaging detection assembly (3), second channel molecule optical filtering imaging detection assembly (4) and data processing and image-display units (5);
Receive optical unit (1) and adopt telescope, total beam splitter (2) is placed in the output light path of optical receiver unit (1), and is 45° angle with telescopical optical axis, and the transmittance and reflectance light splitting ratio of total beam splitter (2) is 50:50;
First passage molecule optical filtering imaging detection assembly (3) absorbs molecule bubble (32), the first catoptron (33) by the first beam splitter (31), first, the first reference molecule steeps (34), the second catoptron (35), the first light combination mirror (36), the first optical filter (37), the first imaging len (38) and the first infra-red imaging array (39) and forms, first beam splitter (31) is positioned in the reflected light light path of total beam splitter (2), and it is parallel with total beam splitter (2), the first absorption molecule bubble (32) and the first catoptron (33) is placed successively in first beam splitter (31) transmitted light light path, the first reference molecule bubble (34) and the second catoptron (35) is placed successively in reflected light light path, the first light combination mirror (36) is placed in the reflected light light path intersection district of the first catoptron (33) and the second catoptron (35), first light combination mirror (36) is parallel with the first beam splitter (31), the transmittance and reflectance light splitting ratio of the first light combination mirror (36) is 50:50, the conjunction bundle light direction of the first light combination mirror (36) places the first optical filter (37) successively, first imaging len (38) and the first infra-red imaging array (39), first infra-red imaging array (39) is positioned on the focal plane of the first imaging len (38), first catoptron (33) and the second catoptron (35) all with the first beam splitter (31) in small angle, the absorption light that first catoptron (33) is reflected is in the right half of imaging of the first infra-red imaging array (39), the reference light that second catoptron (35) reflects is in the left half of imaging of the first infra-red imaging array (39), the first effective air chamber length absorbing molecule bubble (32) is 4cm, is filled with the CO gas of 0.1atm in bubble, and effective air chamber length of the first reference bubble (34) is 4cm, is filled with the N2 gas of 1atm in bubble, the spectrum that the centre wavelength of the first optical filter (37) is 4.76 μm, transmitted spectrum bandwidth 0.1 μm, transmission spectral pattern are the first filter transmission,
Second channel molecule optical filtering imaging detection assembly (4) absorbs molecule bubble (42), the 3rd catoptron (43) by the second beam splitter (41), second, the second reference molecule steeps (44), the 4th catoptron (45), the second light combination mirror (46), the second optical filter (47), the second imaging len (48) and the second infra-red imaging array (49) and forms, second beam splitter (41) is positioned in the reflected light light path of total beam splitter (2), and parallel with total beam splitter (2), place the second absorption molecule bubble (42) and the 3rd catoptron (43) in second beam splitter (41) transmitted light light path successively, in reflected light light path, place the second reference molecule bubble (44) and the 4th catoptron (45) successively, the second light combination mirror (46) is placed in the reflected light light path intersection district of the 3rd catoptron (43) and the 4th catoptron (45), second light combination mirror (46) is parallel with the second beam splitter (41), the transmittance and reflectance light splitting ratio of the second light combination mirror (46) is 50:50, the conjunction bundle light direction of the second light combination mirror (46) places the second optical filter (47) successively, second imaging len (48) and the second infra-red imaging array (49), second infra-red imaging array (49) is positioned on the focal plane of the second imaging len (48), 3rd catoptron (43) and the 4th catoptron (45) all with the second beam splitter (41) in small angle, the absorption light that second catoptron (43) is reflected is in the right half of imaging of the second infra-red imaging array (49), the reference light that 4th catoptron (45) reflects is in the left half of imaging of the second infra-red imaging array (49), the second effective air chamber length absorbing molecule bubble (42) is 4cm, is filled with the CO gas of 0.3atm in bubble, effective air chamber length of the second reference bubble (44) is 4cm, is filled with the N of 1atm in bubble
2gas, the spectrum that the centre wavelength of the second optical filter (47) is 4.9 μm, transmitted spectrum bandwidth 0.1 μm, transmission spectral pattern are the second filter transmission,
Data processing and image-display units (5) are made up of image data acquiring module (51), image data processing module (52) and image display (53); The view data output terminal of the first infra-red imaging array (39) and the second infra-red imaging array (49) is connected respectively to the data input pin of image data acquiring module (51), the data output end of image data acquiring module (51) is connected to the data input pin of image data processing module (52), and the data output end of image data processing module (52) is connected to the data input pin of image display (53).
2. a kind of imaging type combustion measurement device based on binary channels molecule optical filtering technique according to claim 1, it is characterized in that, described telescope can adopt Galilean type telescope or keplerian telescope or Newtonian telescope, and telescopical receiving spectrum covers 4 ~ 5 μm.
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