CN202351178U - Optical diagnosis system based on spontaneous laser raman scattering ray imaging - Google Patents
Optical diagnosis system based on spontaneous laser raman scattering ray imaging Download PDFInfo
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- CN202351178U CN202351178U CN2011205089155U CN201120508915U CN202351178U CN 202351178 U CN202351178 U CN 202351178U CN 2011205089155 U CN2011205089155 U CN 2011205089155U CN 201120508915 U CN201120508915 U CN 201120508915U CN 202351178 U CN202351178 U CN 202351178U
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Abstract
The utility model discloses an optical diagnosis system based on spontaneous laser raman scattering ray imaging, belonging to the field of a laser spectrum testing technology. According to the utility model, a laser pulse shaper is arranged between a laser and a gas sample pool, and a stop device is arranged on one end of a laser emission quartz window of the gas sample pool; a full reflector is placed between the outlet of a scattered light output quartz window of the gas sample pool and a line source collector at 45 degrees; an optical filter is arranged between the line source collector and the inlet of a spectrograph, and the outlet of the spectrograph is respectively connected with the inlets of an ICCD (Intensified Charge Coupled Device) and a measurement and control machine; and the ICCD is respectively connected with the laser and the measurement and control machine. Due to adoption of the utility model, the phenomenon such as the gas cracking, the damage of optical elements and the quartz window, ignition of combustible gas and the like can be effectively avoided, and the weak raman scattering signal to noise ratio can be effectively improved; a multi-channel gas raman spectrum test shows that the optical diagnosis system, provided by the utility model, can be applied to synchronous quantitative measurement of a region with large concentration of mixed gas in an optical engine.
Description
Technical field
The utility model belongs to the laser spectrum technical field of measurement and test, is specifically related to utilize laser spontaneous Raman scattering line imaging quantitative measurment gas concentration.
Background technology
Spontaneous Raman scattering (Spontaneous Raman Scattering, SRS) can be in various combustion fields (like engine, burner and flame etc.) quantitative measurment main matter synchronously, like N
2, O
2, H
2O, CO
2Concentration information with gases such as hydrocarbons.Because this combustion diagnosis technology based on laser has untouchable and characteristic time-space resolution, has been widely used in the Study on Combustion Process under the various complex environments.But all be laser beam to be focused on focus lamp to form (about long 1mm) with a tight waist earlier at present both at home and abroad; And it is put in by on the search coverage; And then the Raman diffused light on will being girdled the waist by collection optical system collects and focuses on chromatic dispersion in the spectrometer, is imaged on CCD at last and goes up by acquisition and recording.Obviously, if want to survey the physical message on other zone, must move the position of focus lamp and light collecting system simultaneously, perhaps move the position of burner, multiple spot detects non real-time property problem in the combustion field with turbulent flow and change in concentration with regard to having caused for this.
In addition; In the SRS of combustion process experiment; The general pulse laser that adopts is because pulsed laser output energy is bigger as excitation source on the one hand, need on the other hand with the combustion system with sequential relationship (like engine) carry out on the working cycle synchronously; Have the circulation resolution characteristic, and do not influence the integral combustion process.The SRS signal of gaseous state is very weak (is about 10 of excitation light intensity
-12), in order to obtain the signal to noise ratio (S/N ratio) that energy that high-quality SRS data must improve pulse laser improves system.But too high pulse laser can cause the damage of gas cracking, the optical element on the laser beam path and quartzy sealed window on the focal zone and directly light flammable gas to be measured.
At present, also there is not a kind of optical diagnostic system that can solve above two aspect problems.
Summary of the invention
The purpose of the utility model is to provide a kind of optical diagnostic system based on laser spontaneous Raman scattering line imaging.
The utility model is by laser instrument 1, shaping for laser pulse device 2, gas appearance pond 3, form by device 4, total reflective mirror 5, line source gatherer 6, optical filter 7, spectrometer 8, ICCD9 and observing and controlling machine 10; Wherein shaping for laser pulse device 2 places between 1 gentle kind of pond of laser instrument 3, and the incident light of the plano-concave lens I11 center of laser beam expander A and laser instrument 1 is on same straight line in the shaping for laser pulse device 2; Laser contracts laser incident quartz window 29 centers in center and gas appearance pond 3 of plano-concave lens II23 of bundle device C on same straight line in the shaping for laser pulse device 2; Laser emitting quartz window 27 1 ends in gas appearance pond 3 are equipped with by device 4; Total reflective mirror 5 is between the plano-convex lens III35 end of 28 outlets of scattered light output quartz window and line source gatherer 6 that 45 places gas appearance pond 3; Optical filter 7 places between the inlet of concave-convex lens 31 ends and spectrometer 8 of line source gatherer 6, and the center of optical filter 7, concave-convex lens 31 and spectrometer 8 inlets is on same straight line; The outlet of spectrometer 8 is connected with the inlet of observing and controlling machine 10 with ICCD9 respectively; ICCD9 also is connected with laser instrument 1, observing and controlling machine 10 respectively.
Shaping for laser pulse device 2 is made up of laser beam expander A, laser pulse stretching device B and the laser bundle device C that contracts, and wherein laser beam expander A is made up of plano-concave lens I11 and plano-convex lens I12, and the center of plano-concave lens I11 and plano-convex lens I12 is on same straight line; Laser pulse stretching device B is made up of 45 incidence reflection mirror I13,0 ° of angle incidence reflection mirror I14,45 incidence reflection mirror II15,0 ° of angle incidence reflection mirror II16,0 ° of angle incidence reflection mirror III17,0 ° of angle incidence reflection mirror IV18,45 incident beam splitter I19,45 incidence reflection mirror III20 and 45 incident beam splitter II21; Constitute the first optics ring cavity by 45 incidence reflection mirror I13,0 ° of angle incidence reflection mirror II16 and 45 incident beam splitter II21; Wherein 0 ° of angle incidence reflection mirror II16 places the place ahead of incident laser; 45 incidence reflection mirror I13 places catoptrical the place ahead of incidence reflection mirror II16,0 ° of angle, and 45 incident beam splitter II21 places input laser q and the catoptrical intersection of 45 incidence reflection mirror I13; Constitute the second optics ring cavity by 0 ° of angle incidence reflection mirror IV18,0 ° of angle incidence reflection mirror I14,0 ° of angle incidence reflection mirror III17,45 incidence reflection mirror II15 and 45 incident beam splitter I19, wherein 45 incidence reflection mirror III20 places the catoptrical the place ahead of 45 incidence reflection mirror I13; 0 ° of angle incidence reflection mirror IV18 places the catoptrical the place ahead of 45 incidence reflection mirror III20; 0 ° of angle incidence reflection mirror I14 places catoptrical the place ahead of incidence reflection mirror IV18,0 ° of angle; 0 ° of angle incidence reflection mirror III17 places catoptrical the place ahead of incidence reflection mirror I14,0 ° of angle; 45 incidence reflection mirror II15 places catoptrical the place ahead of incidence reflection mirror III17,0 ° of angle; 45 incident beam splitter I19 places 45 incidence reflection mirror III20 reflected light and the catoptrical intersection of 45 incidence reflection mirror II15; The laser bundle device C that contracts is made up of with plano-concave lens II23 planoconvex lens 22, and the center of plano-convex lens II22 and plano-concave lens II23 is on same straight line; Planoconvex lens 12 among the laser beam expander A and the center of 0 ° of angle incidence reflection mirror II16 among the laser pulse stretching device B are on same straight line; Contract plano-convex lens II22 among the bundle device C of laser places catoptrical the place ahead of 45 incidence reflection mirror II15 of laser pulse stretching device B; 45 incidence reflection mirror II15 reflected light among the laser pulse stretching device B and laser contract plano-convex lens II22 center among the bundle device C on same straight line.
Line source gatherer 6 is made up of plano-convex lens III35, achromatism concave-convex lens II34, achromatism concave-convex lens I33, biconvex lens 32 and concave-convex lens 31; Wherein plano-convex lens III35, achromatism concave-convex lens II34, achromatism concave-convex lens I33, biconvex lens 32 and concave-convex lens 31 are arranged in order, and its center is on same straight line.
Adopt the utility model can effectively avoid gas cracking, optical element and quartz window to damage and inflammable gas such as lights at the generation of phenomenon, effectively improve weak Raman scattering signal to noise ratio (S/N ratio).The beam expander of design can be with the parallel excitation source that forms the 1mm diameter in the lasing region of original laser behind 10m of 8mm diameter with the bundle device that contracts.Designed a cover combination achromat group, can to greatest extent that 66mm is long scattered beam have dwindled 10 times and become the high real image of 6.6mm, with the maximum vertically matched of CCD.Use the DDG that joins in the CCD
TMCan realize that the sequential between laser instrument and the ICCD is synchronous.
Adopt the utility model can effectively avoid gas cracking, optical element and quartz window to damage and inflammable gas such as lights at the generation of phenomenon; Effectively improve weak Raman scattering signal to noise ratio (S/N ratio), through multi-channel gas Raman spectrum experiment proof: the utility model can be applicable in the optical engine quantitative measurement synchronous on the mixture strength multizone.
Description of drawings
Fig. 1 is the structural representation based on the optical diagnostic system of laser spontaneous Raman scattering line imaging
Fig. 2 is the structural representation of laser beam expander
Fig. 3 laser pulse stretching device structural representation
Fig. 4 restraints the structural representation of device for laser contracts
Fig. 5 is a gas appearance pool structure synoptic diagram
Fig. 6 is a line source collector structure synoptic diagram
Where: A - represents a laser beam expander; B - represents the laser pulse stretcher; C - on behalf of the laser beam shrink; 1 laser 2 laser pulse shaper 3 gas sample pool 4. Deadline device 5. holophote 6. linear light collector 7. filter 8 spectrometer 9.ICCD 10. monitoring machine 11. plano-concave lens I 12. plano-convex lens I 13.45 ° angle of incidence mirror I 14.0 ° angle of incidence mirror I 15.45 ° angle of incidence mirrors II 16.0 ° angle of incidence mirrors II 17.0 ° angle of incidence mirrors III 18.0 ° incident angle mirror IV 19.45 ° angle of incidence of the beam splitter I 20.45 ° angle of incidence mirror III21.45 ° angle of incidence of the beam splitter II 22. plano-convex lens II 23. plano concave II 24 The gas inlet 25. gas outlet 26. gas sample pool cover 27 laser emitting quartz window 28. scattered light output quartz window 29 laser incident quartz window 30. gas sample cell body 31. meniscus lens 32. lenticular 33. achromatic meniscus lens I 34. achromatic meniscus lens II 35. plano-convex lens III q-input laser D - Output Laser
Fig. 7 is 5%CO
2And 95%N
2Mix three-dimensional Raman spectrum curve synoptic diagram down
Wherein: the X axle is represented wavelength, and the Y axle is represented photon number, and the Z axle is represented port number
Embodiment
Fig. 1 shows the structure of utilizing induced with laser gas SRS optical diagnostic system.
The laser instrument 1 that the SRS light source adopts is the flash lamp pumping Nd:YAG laser instrument that the LS-2137U type of Byelorussia LOTIS LII company is transferred Q.Choosing wavelength is 532nm (nanometer), and frequency is the pulse laser output of 10Hz (hertz).When pumping lamp can be when 40J (Jiao Er); 400mj (milli Jiao Er) energy, the about 0.4GW of peak power (gigawatt), halfwidth (Full width at halfmaximum intensity that laser instrument output is stable; FWHM) be the spike pulse laser of 6.5ns (nanosecond); Beam divergence angle is less than 1mrad (milliradian), and spot diameter is 8mm (millimeter).
Employed laser beam expander A is as shown in Figure 2, can be with the beam expander of 8mm diameter to 16mm.
It is as shown in Figure 3 that employed laser pulse stretching device B has two optics ring cavities, and wherein, the reflectivity of 45 incident beam splitter II21 is 48%, and the reflectivity of 45 incident beam splitter I19 is 51%.The reflectivity of all 45 ° of incidence reflection mirrors is 99.5%, and the reflectivity of all 0 ° of incidence reflection mirrors is 99.0%.
Centre distance between 45 incident beam splitter II21 and the 0 ° of angle incidence reflection mirror II16 is 0.82m; Centre distance between 0 ° of angle incidence reflection mirror II16 and the 45 incidence reflection mirror I13 is 0.93m; Centre distance between 45 incidence reflection mirror I13 and the 45 incident beam splitter II21 is 0.2m; Centre distance between 45 incident beam splitter II21 and the 45 incidence reflection mirror III20 is 0.4m; Centre distance between 45 incidence reflection mirror III20 and the 45 incident beam splitter I19 is 0.1m; Centre distance between 45 incident beam splitter I19 and the 0 ° of angle incidence reflection mirror IV18 is 0.8m; Centre distance between 0 ° of angle incidence reflection mirror IV18 and the 0 ° of angle incidence reflection mirror I14 is 0.88m; Centre distance between 0 ° of angle incidence reflection mirror I14 and the 0 ° of angle incidence reflection mirror III17 is 0.86m, and the centre distance between 0 ° of angle incidence reflection mirror III17 and the 45 incidence reflection mirror II15 is 0.85m, and the centre distance between 45 incidence reflection mirror II15 and the 45 incident beam splitter I19 is 0.455m.Through being about 6.5ns the time delay of calculating the first optics ring cavity, just equal the FWHM of former laser.Be about 13.2ns the time delay of the second optics ring cavity, ratio approached desirable 1: 2.
Employed laser contracts, and C is as shown in Figure 4 for the bundle device.Can the light beam of 16mm diameter be contracted and restraint 1mm.
Employed gas appearance pond is as shown in Figure 5.It allows to charge into 5 atmospheric mixed gass, and laser emitting quartz window 27, scattered light output quartz window 28 and laser incident quartz window 29 are arranged.
Employed line source gatherer can dwindle the scattered light of long 66mm 10 times, and has the achromatism function.
Employed total reflective mirror 5, purpose are the light path forms of simulating fully on the actual optical engine.
The Surespectrum 500is/sm type imaging spectrometer that employed spectrometer 8 is a U.S. Bruker company; It has adopted Czerny-Turner (Che Erni-Tener) light channel structure; Principal feature is that it can carry out the chromatic dispersion of complex light by the longitudinal space position; Be that spectrometer 8 slit lengthwise positions are corresponding one by one with the lengthwise position of CCD image planes, allow the multi-channel spectral signals collecting.In the experiment, slit is adjusted to 200 μ m, and grating is selected 150g/mm for use.
Employed ICCD9 is the iStar DH 720-18F-03 enhancement mode CCD of Britain Andor company, and ccd sensor is of a size of 256 pixels (vertically) * 1024 pixels (laterally), and minimum pixel is 26 μ m * 26 μ m.It and spectrometer 8 are united use.Its inside is furnished with digital delay generator DDG
TM, through the sequential control and the collection analysis spectral signal of three equipment rooms of observing and controlling computing machine completion.In the experiment, gain is set to 200, and portal vein is wide to be 40ns.
Experimental result and analysis:
1. multi-channel spectral data under the different mixture strengths of uniform pressure
In gas appearance pond, charge into 3kgf/cm
2Variable concentrations under CO
2And N
2Mixed gas.Fig. 7 shows 5%CO
2And 95%N
2Original three-dimensional Raman spectrum curve during mixing.Table 1 shows under this pressure, the standard deviation A of two kinds of gas peak areas
STD-CO2And A
STD-N2Situation of change with different matched proportion densities.The standard deviation of each peak area all is the statistics on 10 search coverages.
Table 1 is at 3kgf/cm
2The standard deviation of the following 2 kinds of gas SRS spectrum peak areas of the following 6 kinds of experiment conditions of pressure
It is thus clear that along with the increase of concentration, the standard deviation of the peak area of the SRS spectrum of every kind of material reduces gradually, degree of accuracy improves thereupon.Use institute's development system, the detecting area that 66mm is long, when being divided into 10 equally spaced zones about each 6mm and carrying out the SRS spectra collection, the concentration through the peak face amount calculates can reach 2% measuring accuracy.
Multi-channel spectral data under the 2 different pressures same mixture gas concentration
In gas appearance pond, charge into 5%CO
2And 95%N
2, carried out the SRS experiment of 5 kinds of different pressures.Table 2 shows under this concentration, the standard deviation A of two kinds of gas peak areas
STD-CO2And A
STD-N2With the different pressures situation of change.The standard deviation of each peak area all is the statistics on 10 zones.
Table 2 is at 5%CO
2And 95%N
2The standard deviation of the following 2 kinds of gas SRS spectrum peak areas of concentration conditions
It is thus clear that along with the attenuating of pressure, the standard deviation of the peak area of the SRS spectrum of every kind of material increases gradually, degree of accuracy descends thereupon.But when being lower than 1 atmospheric pressure, still can measure the SRS spectroscopic data of gaseous matter.
Claims (4)
1. optical diagnostic system based on laser spontaneous Raman scattering line imaging; It is characterized in that by laser instrument (1), shaping for laser pulse device (2), gas appearance pond (3), form by device (4), total reflective mirror (5), line source gatherer (6), optical filter (7), spectrometer (8), ICCD (9) and observing and controlling machine (10); Wherein shaping for laser pulse device (2) places between laser instrument (1) the gentle appearance pond (3), and the incident light of plano-concave lens I (11) center of laser beam expander (A) and laser instrument (1) is on same straight line in the shaping for laser pulse device (2); Laser contracts laser incident quartz window (29) center in center and gas appearance pond (3) of plano-concave lens II (23) of bundle device (C) on same straight line in the shaping for laser pulse device (2); Laser emitting quartz window (27) one ends in gas appearance pond (3) are equipped with by device (4); Total reflective mirror (5) is between plano-convex lens III (35) that 45 places scattered light output quartz window (28) outlet and the line source gatherer (6) in gas appearance pond (3) holds; Optical filter (7) places between the inlet of concave-convex lens (31) end and spectrometer (8) of line source gatherer (6), and the center that optical filter (7), concave-convex lens (31) and spectrometer (8) enter the mouth is on same straight line; The outlet of spectrometer (8) is connected with the inlet of observing and controlling machine (10) with ICCD (9) respectively; ICCD (9) also is connected with laser instrument (1), observing and controlling machine (10) respectively.
2. by the described optical diagnostic system of claim 1 based on laser spontaneous Raman scattering line imaging; It is characterized in that described shaping for laser pulse device (2) by laser beam expander (A), laser pulse stretching device (B) and laser contract the bundle device (C) form; Wherein laser beam expander (A) is made up of plano-concave lens I (11) and plano-convex lens I (12), and the center of plano-concave lens I (11) and plano-convex lens I (12) is on same straight line; Laser pulse stretching device (B) is made up of 45 incidence reflection mirror I (13), 0 ° of angle incidence reflection mirror I (14), 45 incidence reflection mirror II (15), 0 ° of angle incidence reflection mirror II (16), 0 ° of angle incidence reflection mirror III (17), 0 ° of angle incidence reflection mirror IV (18), 45 incident beam splitter I (19), 45 incidence reflection mirror III (20) and 45 incident beam splitter II (21); Constitute the first optics ring cavity by 45 incidence reflection mirror I (13), 0 ° of angle incidence reflection mirror II (16) and 45 incident beam splitter II (21); Wherein 0 ° of angle incidence reflection mirror II (16) places the place ahead of incident laser; 45 incidence reflection mirror I (13) places the catoptrical the place ahead of 0 ° of angle incidence reflection mirror II (16), and 45 incident beam splitter II (21) places input laser (q) and the catoptrical intersection of 45 incidence reflection mirror I (13); Constitute the second optics ring cavity by 0 ° of angle incidence reflection mirror IV (18), 0 ° of angle incidence reflection mirror I (14), 0 ° of angle incidence reflection mirror III (17), 45 incidence reflection mirror II (15) and 45 incident beam splitter I (19), wherein 45 incidence reflection mirror III (20) places the catoptrical the place ahead of 45 incidence reflection mirror I (13); 0 ° of angle incidence reflection mirror IV (18) places the catoptrical the place ahead of 45 incidence reflection mirror III (20); 0 ° of angle incidence reflection mirror I (14) places the catoptrical the place ahead of 0 ° of angle incidence reflection mirror IV (18); 0 ° of angle incidence reflection mirror III (17) places the catoptrical the place ahead of 0 ° of angle incidence reflection mirror I (14); 45 incidence reflection mirror II (15) places the catoptrical the place ahead of 0 ° of angle incidence reflection mirror III (17); 45 incident beam splitter I (19) places 45 incidence reflection mirror III (20) reflected light and the catoptrical intersection of 45 incidence reflection mirror II (15); Laser contract the bundle device (C) form by planoconvex lens (22) and plano-concave lens II (23), the center of plano-convex lens II (22) and plano-concave lens II (23) is on same straight line; The center of 0 ° of angle incidence reflection mirror II (16) in planoconvex lens (12) in the laser beam expander (A) and the laser pulse stretching device (B) is on same straight line; Contract plano-convex lens II (22) in bundle device (C) of laser places catoptrical the place ahead of 45 incidence reflection mirror II (15) of laser pulse stretching device (B); 45 incidence reflection mirror II (15) reflected light in the laser pulse stretching device (B) and laser contract plano-convex lens II (22) center in bundle device (C) on same straight line.
3. by the described optical diagnostic system of claim 1 based on laser spontaneous Raman scattering line imaging; It is characterized in that described gas appearance pond (3) is made up of gas access (24), gas vent (25), gas appearance Chi Gai (26), laser emitting quartz window (27), scattered light output quartz window (28), laser incident quartz window (29) gentle appearance tank main body (30); Wherein laser incident quartz window (29) is located at gas appearance tank main body (30) one sides; Laser emitting quartz window (27) is located at gas appearance tank main body (30) opposite side; Scattered light output quartz window (28) is fixed in gas appearance tank main body (30) middle part; Gas appearance Chi Gai (26) is located at gas appearance tank main body (30) top, and gas access (24) and gas vent (25) are fixed in gas appearance Chi Gai (26) top.
4. by the described optical diagnostic system of claim 1 based on laser spontaneous Raman scattering line imaging; It is characterized in that described line source gatherer (6) is made up of plano-convex lens III (35), achromatism concave-convex lens II (34), achromatism concave-convex lens I (33), biconvex lens (32) and concave-convex lens (31); Wherein plano-convex lens III (35), achromatism concave-convex lens II (34), achromatism concave-convex lens I (33), biconvex lens (32) and concave-convex lens (31) are arranged in order, and its center is on same straight line.
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|---|---|---|---|
| CN2011205089155U CN202351178U (en) | 2011-12-08 | 2011-12-08 | Optical diagnosis system based on spontaneous laser raman scattering ray imaging |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495041A (en) * | 2011-12-08 | 2012-06-13 | 吉林大学 | Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging |
| CN108767630A (en) * | 2018-09-03 | 2018-11-06 | 吉林大学 | A kind of laser pulse stretching system |
| CN108827940A (en) * | 2018-08-20 | 2018-11-16 | 吉林大学 | A kind of three-dimensional laser Raman diffused light spectral measurement system |
| CN108827939A (en) * | 2018-08-15 | 2018-11-16 | 吉林大学 | A kind of two-dimensional laser Raman diffused light spectral measurement system |
-
2011
- 2011-12-08 CN CN2011205089155U patent/CN202351178U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495041A (en) * | 2011-12-08 | 2012-06-13 | 吉林大学 | Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging |
| CN102495041B (en) * | 2011-12-08 | 2013-09-11 | 吉林大学 | Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging |
| CN108827939A (en) * | 2018-08-15 | 2018-11-16 | 吉林大学 | A kind of two-dimensional laser Raman diffused light spectral measurement system |
| CN108827939B (en) * | 2018-08-15 | 2023-09-19 | 吉林大学 | Two-dimensional laser Raman scattering spectrum measurement system |
| CN108827940A (en) * | 2018-08-20 | 2018-11-16 | 吉林大学 | A kind of three-dimensional laser Raman diffused light spectral measurement system |
| CN108827940B (en) * | 2018-08-20 | 2023-09-19 | 吉林大学 | Three-dimensional laser Raman scattering spectrum measurement system |
| CN108767630A (en) * | 2018-09-03 | 2018-11-06 | 吉林大学 | A kind of laser pulse stretching system |
| CN108767630B (en) * | 2018-09-03 | 2023-11-24 | 吉林大学 | Laser pulse widening system |
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