CN108918505A - A kind of polarization type gas Raman spectral measurement system - Google Patents
A kind of polarization type gas Raman spectral measurement system Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 172
- 230000010287 polarization Effects 0.000 title claims abstract description 148
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- 241000894007 species Species 0.000 abstract description 13
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- 238000012545 processing Methods 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 230000010259 detection of temperature stimulus Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 230000002269 spontaneous effect Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001237 Raman spectrum Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- 238000005215 recombination Methods 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001067739 Lotis Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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Abstract
A kind of polarization type gas Raman spectral measurement system category laser diagnostics in combustion field, generation system, horizontal polarization Raman system and vertical polarization Raman system front and back is polarized in the present invention to place, Optical Maser System sets the horizontal polarization Raman system left side, polarization decomposing system is set on the right of horizontal polarization Raman system, and TT&C system is set on the right of vertical polarization Raman system；Combustion zone is located between polarization generation system and laser collector；Horizontal center line II and horizontal center line I are vertically intersected on 45 degree of mirror centers；Horizontal center line II is vertical with horizontal center line IV to meet at burning district center；Horizontal center line III is vertical with horizontal center line IV to meet at polarized light beam splitting prism centers.The present invention is by the decomposition of the polarization characteristic processing technique of original laser and two kinds of polarization scattering light and synchronous receives and subtraction technique, it eliminates fluorescence and interferes and maximise gas Raman scattered signal, realize combustion field species of gases molar fraction and the detection of temperature high-precision quantitative.
Description
Technical field
The invention belongs to laser diagnostics in combustion fields, and in particular to a kind of polarization type gas Raman spectral measurement system.
Background technique
High-efficiency cleaning safe combustion is important one of the research topic of the mankind.Either in engine (including aerospace
Engine, communications and transportation engine etc.), in the coal measures system and gas turbine of power supply heat supply, or in all kinds of of basic research
Burning in burner, requiring to explore by various advanced combustion diagnosis technological means further improves combustion position
Approaches and methods.The problems such as due to the closure of some combustion systems, transient state, explosion abominable, people generally use at present
Various laser diagnostics in combustion detect combustion process.It can be directly observed combustion field combustion state by these technologies,
It realizes the precise measurement of the high time-space resolutions such as combustion field temperature, component and concentration of component, mobility and flame structure, is Theory of Combustion
Numerical simulation calculation provides experimental verification.
By laser spontaneous vibrational Raman scattering species spectral measurement, the dominant species under complicated burning situation may be implemented
Concentration (molar fraction) and regional temperature detection, and there is untouchable, the several species measurement synchronism, quantitative of measurement
Property, time (nanosecond) and space (grade) resolution capability.At present it have been widely used for as in engine combustion room or
In various combustion systems under certain closing or atmospheric environment.There is gaseous species (nitrogen, oxygen of Raman active by synchro measure
Gas, carbon dioxide, hydrocarbon fuel, hydrogen, carbon monoxide etc.) spontaneous vibration Stokes Raman spectral signal, to obtain gas
Body molar fraction, and by the spontaneous vibration Stokes and anti stokes raman spectrum signal of nitrogen, to obtain local space
On temperature.These optical measurements and numerical simulation calculation result are verified and are supplemented mutually, are Theory of Combustion and burning examination
Offer basic data is provided.
But this current measuring technique does not account for the polarization characteristic of gas to gas Raman spectrum in more application
The influence of measurement result causes the very weak gas Raman signal of induced with laser gas fluorescence severe jamming, so that quantitative measurment
It is extremely difficult, especially when excitation light source is in ultra-violet (UV) band fundamental measurement less than gas Raman spectral signal.Even if this measurement skill
Art considers the influence of gas polarization characteristic in various applications, but all not from the polarization state processing technique of original laser and connects
It is synchronous in conjunction with come the accurate quantification measurement of completing gas Raman spectrum to receive the aspect of polarization scattering light technology two.
Summary of the invention
Polarization state change technology and polarization scattering photodegradation are carried out using original laser the purpose of the present invention is to provide a kind of
And spectrum acquisition technology combines to complete laser spontaneous vibrational Raman scattering accurate quantification measurement gas molar score technology.It is logical
It crosses 1/2 wave plate of zero level and Wollaston prism and original laser is become into vertical polarization (p-polarization) and horizontal polarization (s polarization)
Two beam excitation light sources, form dissipating for both polarization states after each gaseous species to be measured in this two beams laser deexcitation combustion field
Light is penetrated, then is divided into the scattering light of both polarization directions by a polarized light beam splitting prism, and by the Raman of two sets of identical settings
Spectrum imaging system is synchronous to be received, finally with vertical polarization raman spectral signal subtract horizontal polarization Raman signal obtain it is not glimmering
The maximized gaseous species raman spectral signal of light interference, to realize mixed gas molar fraction and the area of combustion field environment
The spectral detection of domain temperature.
The present invention by polarization generate system I, Optical Maser System II, horizontal polarization Raman system III, polarization decomposing system IV,
Vertical polarization Raman system V, TT&C system VI, combustion zone 1 and laser collector 2 form, wherein polarization generates system I, laser
Device system II, horizontal polarization Raman system III, polarization decomposing system IV, vertical polarization Raman system V, TT&C system VI, burning
Area 1 and laser collector 2 are placed on the optical platform of same level；Polarization generates system I, III and of horizontal polarization Raman system
For vertical polarization Raman system V from placing front to back, Optical Maser System II is placed in the left side of horizontal polarization Raman system III, polarization
Decomposing system IV is placed in the right of horizontal polarization Raman system III, and TT&C system VI is placed in the right side of vertical polarization Raman system V
Side；Combustion zone 1 is located at the front-left that polarization generates system I front-right and laser collector 2；Polarization generates in the level of system I
The horizontal center line I 4 of heart line II 9 and Optical Maser System II is vertically intersected in 45 degree of reflecting mirrors 3 that polarization generates in system I
The heart；The horizontal center line IV 27 of horizontal center line II 9 and polarization decomposing system IV that polarization generates system I is vertically intersected on burning
The center in area 1；The horizontal center line of vertical polarization Raman system V and the horizontal center line of polarization decomposing system IV are level
Center line IV 27；The horizontal center line III 26 and horizontal center line IV 27 of horizontal polarization Raman system III are vertically intersected on polarization point
The center of polarized light beam splitting prism 31 in solution system IV.
The external trigger output port c of Raman ICCD camera I 20 is through private cable and laser in horizontal s polarization Raman system III
The Q-switch external trigger input port b connection of laser controller 19 in device system II.
I e of data-out port of Raman ICCD camera I 20 is through private cable and observing and controlling in horizontal s polarization Raman system III
The II i connection of data-in port of industrial personal computer 41 in system VI.
II g of data-out port of Raman ICCD camera II 33 through private cable and is surveyed in vertical p-polarization Raman system V
The I h connection of data-in port of industrial personal computer 41 in control system VI.
I j of pulse output end mouth of digital delay impulse generator 42 is through private cable and vertical p-polarization in TT&C system VI
The II f connection of external trigger input port of Raman ICCD camera II 33 in Raman system V.
II k of pulse output end mouth of digital delay impulse generator 42 is inclined through private cable and horizontal s in TT&C system VI
The I d connection of external trigger input port of Raman ICCD camera I 20 in Raman system III of shaking.
In TT&C system VI digital delay impulse generator 42 and III l of pulse output end mouth through private cable and laser
The pumping lamp external trigger input port a connection of laser controller 19 in system II.
The polarization generates system I and is made of 45 degree of reflecting mirrors 3, zero-th order waveplates 5, Wollaston prism 6, focus lamp 8,
45 degree of reflecting mirrors 3, zero-th order waveplates 5, Wollaston prism 6 and focus lamp 8 arrange from left to right, and 45 degree of reflecting mirrors 3, zero order waves
The center line of piece 5, Wollaston prism 6 and focus lamp 8 is overlapped with horizontal center line II 9；The plated film working face of 45 degree of reflecting mirrors 3
Towards positive lower right.
The Optical Maser System II is made of laser pulse stretcher 17, laser 18 and laser controller 19, wherein
Laser controller 19 is equipped with pumping lamp external trigger input port a and Q-switch external trigger input port b；Laser controller 19 swashs
Light device 18 and laser pulse stretcher 17 are from rear to preceding arrangement, 18 laser of laser exit and laser of laser pulse stretcher 17
The line of centres of outlet is horizontal center line I 4, and laser controller 19 is connect through laser private cable 15 with laser 18.
The horizontal polarization Raman system III is polarized by Raman ICCD camera I 20, adapter I 21, spectrometer I 22 and s
Light collector 24 forms, and wherein Raman ICCD camera I 20 is equipped with external trigger output port c, I d sum number of external trigger input port
According to I e of output port；S polarizes light collector 24, spectrometer I 22, adapter I 21 and Raman ICCD camera I 20 and arranges from right-to-left
Column, Raman ICCD camera I 20 are affixed through adapter I 21 and the spectrum outlet of spectrometer I 22；The entrance slit and s of spectrometer I 22
The line of centres for polarizing light collector 24 is horizontal center line III 26.
The polarization decomposing system IV collects mirror 29 by scattering light and polarized light beam splitting prism 31 forms, and scattering light is collected
In tandem, it is water that scattering light, which collects mirror 29 and the line of centres of polarized light beam splitting prism 31, for mirror 29 and polarized light beam splitting prism 31
Flat center line IV 27.
The vertical polarization Raman system V is by Raman ICCD camera II 33, p-polarization light collector 35, spectrometer II 36
It is formed with adapter II 37, wherein Raman ICCD camera II 33 is equipped with II f of external trigger input port and data-out port II
g；II 36 left-right situs of Raman ICCD camera II 33 and spectrometer, Raman ICCD camera II 33 is through adapter II 37 and spectrometer II
36 spectrum outlet is affixed；P-polarization light collector 35 is placed in the front of spectrometer II 36, p-polarization light collector 35 and spectrometer
The line of centres of entrance slit is horizontal center line I 4 in II 36.
The TT&C system VI is made of display 40, industrial personal computer 41 and digital delayed-pulse generator 42, industrial personal computer
41 are equipped with Raman ICCD camera capture card I 38 and Raman ICCD camera capture card II 39；On Raman ICCD camera capture card I 38
Equipped with I h of data-in port, Raman ICCD camera capture card II 39 is equipped with II i of data-in port；Digital delay pulse hair
Raw device 42 is equipped with III l of I j of pulse output end mouth, II k of pulse output end mouth and pulse output end mouth；Display 40 is placed in industry control
Above machine 41, digital delay impulse generator 42 is placed in 41 right side of industrial personal computer.
The decomposition and synchronous reception that the present invention passes through the polarization characteristic processing technique and two kinds of polarization scattering light of original laser
And subtraction technique, it eliminates fluorescence and interferes and maximise gas Raman scattered signal, realize combustion field species of gases mole point
The detection of several and temperature high-precision quantitative.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of polarization type gas Raman spectral measurement system
Fig. 2 is the structural schematic diagram that polarization generates system I
Fig. 3 is the structural schematic diagram of Optical Maser System II
Fig. 4 is the structural schematic diagram of horizontal polarization Raman system III
Fig. 5 is the structural schematic diagram for polarizing decomposing system IV
Fig. 6 is the structural schematic diagram of vertical polarization Raman system V
Fig. 7 is the structural schematic diagram of TT&C system VI
Fig. 8 is signal timing sequence diagram
Wherein：I, polarizes II, Optical Maser System of generation system, III, horizontal polarization Raman system, IV, and polarizes decomposing system
V 1. combustion zone of vertical polarization VI, TT&C system of Raman system, 2. laser collector, 3.45 degree of 4. horizontal centres of reflecting mirror
I 5. zero-th order waveplates of line, 6. 9. horizontal center line of Wollaston prism 7.p 8. focus lamp of polarized laser beam, II 10.P polarization
With s polarization complex focusing laser beam 11.S polarized laser beam 12.P polarization and 13. broadened laser beam I of S-polarization recombination laser beam
14. 17. laser pulse stretcher of broadened laser beam II 15. laser private cable, 16. original laser beam, 18. laser
19. 20. I 22. spectrometer of Raman ICCD I 21. adapter of camera of laser controller, I 23.s polarizes Raman light and fluorescence is compound
It scatters light 24.s polarization light collector 25.s and polarizes Raman light, 26. horizontal center line III of fluorescence and laser combination scattering light
27. horizontal center line IV 28. scatters light I 29. and scatters the light collection scattering of mirror 30. II 31. polarized light beam splitting prism 32.p of light
It polarizes Raman light, fluorescence and 33. Raman ICCD camera of laser combination scattering light, II 34.p polarization Raman light and fluorescence is compound scattered
Penetrate light 35.p polarization 36. spectrometer of light collector, II 37. adapter, II 38. Raman ICCD camera capture card, I 39. Raman
The input of 41. industrial personal computer of ICCD camera II 40. display of capture card, 42. digital delay impulse generator a. pumping lamp external trigger
Port b.Q switchs I e. data-out port I of external trigger input port c. external trigger output port d. external trigger input port
F. II g. data-out port of external trigger input port, II h. data-in port, I i. data-in port, II j. pulse is defeated
I k. pulse output end mouth of exit port, II l. pulse output end mouth III
Specific embodiment
Present invention is described with reference to the accompanying drawing：
The present invention by polarization generate system I, Optical Maser System II, horizontal polarization Raman system III, polarization decomposing system IV,
Vertical polarization Raman system V, TT&C system VI, combustion zone 1 and laser collector 2 form, wherein polarization generates system I, laser
Device system II, horizontal polarization Raman system III, polarization decomposing system IV, vertical polarization Raman system V, TT&C system VI, burning
Area 1 and laser collector 2 are placed on the optical platform of same level；Polarization generates system I, III and of horizontal polarization Raman system
For vertical polarization Raman system V from placing front to back, Optical Maser System II is placed in the left side of horizontal polarization Raman system III, polarization
Decomposing system IV is placed in the right of horizontal polarization Raman system III, and TT&C system VI is placed in the right side of vertical polarization Raman system V
Side；Combustion zone 1 is located at the front-left that polarization generates system I front-right and laser collector 2；Polarization generates in the level of system I
The horizontal center line I 4 of heart line II 9 and Optical Maser System II is vertically intersected in 45 degree of reflecting mirrors 3 that polarization generates in system I
The heart；The horizontal center line IV 27 of horizontal center line II 9 and polarization decomposing system IV that polarization generates system I is vertically intersected on burning
The center in area 1；The horizontal center line of vertical polarization Raman system V and the horizontal center line of polarization decomposing system IV are level
Center line IV 27；The horizontal center line III 26 and horizontal center line IV 27 of horizontal polarization Raman system III are vertically intersected on polarization point
The center of polarized light beam splitting prism 31 in solution system IV.
The external trigger output port c of Raman ICCD camera I 20 is through private cable and laser in horizontal s polarization Raman system III
The Q-switch external trigger input port b connection of laser controller 19 in device system II.
I e of data-out port of Raman ICCD camera I 20 is through private cable and observing and controlling in horizontal s polarization Raman system III
The II i connection of data-in port of industrial personal computer 41 in system VI.
II g of data-out port of Raman ICCD camera II 33 through private cable and is surveyed in vertical p-polarization Raman system V
The I h connection of data-in port of industrial personal computer 41 in control system VI.
I j of pulse output end mouth of digital delay impulse generator 42 is through private cable and vertical p-polarization in TT&C system VI
The II f connection of external trigger input port of Raman ICCD camera II 33 in Raman system V.
II k of pulse output end mouth of digital delay impulse generator 42 is inclined through private cable and horizontal s in TT&C system VI
The I d connection of external trigger input port of Raman ICCD camera I 20 in Raman system III of shaking.
In TT&C system VI digital delay impulse generator 42 and III l of pulse output end mouth through private cable and laser
The pumping lamp external trigger input port a connection of laser controller 19 in system II.
As shown in Fig. 2, the polarization generate system I by 45 degree reflecting mirrors 3, zero-th order waveplates 5, Wollaston prism 6, gather
Burnt mirror 8 forms, and 45 degree of reflecting mirrors 3, zero-th order waveplates 5, Wollaston prism 6 and focus lamp 8 arrange from left to right, and 45 degree of reflections
Mirror 3, zero-th order waveplates 5, Wollaston prism 6 and focus lamp 8 center line be overlapped with horizontal center line II 9；45 degree of reflecting mirrors 3
Plated film working face is towards positive lower right.
As shown in figure 3, the Optical Maser System II is by laser pulse stretcher 17, laser 18 and laser controller 19
Composition, wherein laser controller 19 is equipped with pumping lamp external trigger input port a and Q-switch external trigger input port b；Laser control
Device 19, laser 18 and laser pulse stretcher 17 processed the laser exit of laser pulse stretcher 17 and swash from rear to preceding arrangement
The line of centres of 18 laser exit of light device is horizontal center line I 4, and laser controller 19 is through laser private cable 15 and laser
18 connections.
As shown in figure 4, the horizontal polarization Raman system III is by Raman ICCD camera I 20, adapter I 21, spectrometer I
22 and s polarizes light collector 24 and forms, and wherein Raman ICCD camera I 20 is equipped with external trigger output port c, external trigger input terminal
Mouth I d and I e of data-out port；S polarizes light collector 24, spectrometer I 22, adapter I 21 and Raman ICCD camera I 20 from the right side
It is arranged to left bank, Raman ICCD camera I 20 is affixed through adapter I 21 and the spectrum outlet of spectrometer I 22；The entrance of spectrometer I 22
The line of centres of slit and s polarization light collector 24 is horizontal center line III 26.
As shown in figure 5, the polarization decomposing system IV collects mirror 29 by scattering light and polarized light beam splitting prism 31 forms,
It scatters light and collects mirror 29 and polarized light beam splitting prism 31 in tandem, scattering light is collected in mirror 29 and polarized light beam splitting prism 31
Heart line is horizontal center line IV 27.
As shown in fig. 6, the vertical polarization Raman system V by Raman ICCD camera II 33, p-polarization light collector 35,
Spectrometer II 36 and adapter II 37 form, and wherein Raman ICCD camera II 33 is equipped with II f of external trigger input port and data
II g of output port；II 36 left-right situs of Raman ICCD camera II 33 and spectrometer, Raman ICCD camera II 33 is through adapter II 37
It is affixed with the spectrum outlet of spectrometer II 36；P-polarization light collector 35 is placed in the front of spectrometer II 36, p-polarization light collector
35 and spectrometer II 36 in entrance slit the line of centres be horizontal center line I 4.
As shown in fig. 7, the TT&C system VI is by display 40, industrial personal computer 41 and digital 42 groups of delayed-pulse generator
At industrial personal computer 41 is equipped with Raman ICCD camera capture card I 38 and Raman ICCD camera capture card II 39；Raman ICCD camera is adopted
Truck I 38 is equipped with I h of data-in port, and Raman ICCD camera capture card II 39 is equipped with II i of data-in port；Number
Delayed-pulse generator 42 is equipped with III l of I j of pulse output end mouth, II k of pulse output end mouth and pulse output end mouth；Display
40 are placed in above industrial personal computer 41, and digital delay impulse generator 42 is placed in 41 right side of industrial personal computer.
Specific connection procedure and requirement of the invention is as follows：
Each optical device centre-height of first successive step：By adjusting each knob position of mirror holder instrument base, so that burning
Area 1,2,45 degree of reflecting mirrors 3 of laser collector, zero-th order waveplates 5, Wollaston prism 6, focus lamp 8, laser pulse stretcher 17,
Laser 18, Raman ICCD camera I 20, spectrometer I 22, s polarization light collector 24, scattering light collect mirror 29, polarized light beam splitting
Prism 31, Raman ICCD camera II 22, p-polarization light collector 35 and spectrometer II 36 center in same level；Pass through
Adjustment is so that horizontal center line II 9 and horizontal center line I 4 are vertically intersected on the center of 45 degree of reflecting mirrors 3 in same level
The heart, while the center of combustion zone 1 is vertically intersected on horizontal center line IV 27 in same level；So that horizontal center line
II 9 are vertically intersected on the center of polarized light beam splitting prism 31 with horizontal center line III 26 in same level.
All appts equipment is powered and preheats, and each instrument knob position is arranged, and each measurement parameter of instrument is inputted, into industry control
Primary control program on machine 41.
Accurately adjust each optical device center various dimensions position：Laser emitter 18 is emitted the low energy of debugging
532nm (nanometer) visible light original laser beam 16, passes through the real time imagery of Raman ICCD camera I 20 and Raman ICCD camera II 33
Functional mode, the laser of the 1 center space of points of synchro measure combustion zone.Finely tune the height of all devices and mirror holder, left and right and
Front-rear position, inclination angle and pitching, guarantee display 40 on show respectively by Raman ICCD camera capture card I 38 and Raman ICCD
Two real images received by camera II 39 are overlapped, and on the screen of display 40 vertically or horizontally.
Measure the laser spontaneous vibrational Raman scattering spectrum of the gaseous species under high temperature and pressure：By combustion zone 1 be adjusted to
Under the pressure of survey, temperature and concentration of component；The setting of laser 18, Raman ICCD camera I 20 and Raman ICCD camera II 33 is arrived
It measures under functional mode；Control the original laser beam 16 that laser 18 is emitted certain experiment energy mJ (millijoule)；According to shown in Fig. 8
Signal synchronous sequence completes P polarization and s polarization complex focusing laser beam 10 on combustion zone 1 by the main program in industrial personal computer 41
The measurement of each species Raman spectrum on focus point finally calculates this reality by two spectrum phase reducings in main program
The molar fraction and regional temperature value of each species under the conditions of testing.
Embodiment：
As shown in Figure 1, in Optical Maser System II select Byelorussia LOTIS TII company LS2137 type laser 18,
The laser pulse stretcher 17 of PS2225 type laser controller 19 and independent research, it is original that laser 18 is emitted 532nm (nanometer)
Laser beam 16, outlet spot diameter is about 8mm (millimeter), and pulsewidth halfwidth (FWHM) is about 7ns (nanosecond), and frequency is
10Hz, experiment output laser energy is 380 millijoules, peak power 0.4GW；Laser pulse stretcher 17 exports broadened laser beam
II 14 and broadened laser beam I 13, FWHM be about 35ns, spot diameter 6mm, frequency 10Hz, energy 350mJ, peak value
Power is 0.02GW.Broadened laser beam I 13 first passes around 1/2 zero-th order waveplates 5 of linear polarization for having rotated 45 degree of angles, and forms p
Polarization and s polarize recombination laser beam 12, are classified as using the WPQ10 type Wollaston prism 6 of THORLABS company of the U.S.
Upper and lower two laser beams, i.e. p-polarization laser beam 7 and s polarized laser beam 11；This two beams laser beam is the poly- of 500mm by focal length
Burnt mirror 8 synthesizes p-polarization and s polarization complex focusing laser beam 10, and focuses on a focus point area of space in combustion zone 1
On, the gaseous species in the deexcitation region can mainly generate Raman diffused light, fluorescence and laser light scattering light etc.；It is homemade to swash
Light collector 2 collects the elastic scattering laser after the completion of excitation；The scattering light that diameter is 70mm is collected mirror 29 and is pressed and P polarization and s
Complex focusing laser beam 10 is polarized into the scattering light I in the solid angle of certain collection on 90 degree of directions collection focus point area of space
28, form scattering light II 30；Light II 30 is scattered to decompose by the VA5-532 polarized light beam splitting prism 31 of THORLABS company of the U.S.
At s polarization Raman light, fluorescence and laser combination scattering light 25 and p-polarization Raman light, fluorescence and laser combination scattering light 32, respectively
S polarization Raman is formed after filtering out laser light scattering light after s polarization light collector 24 and p-polarization collector 35 by independent research
Light and fluorescence combination scattering light 23 and p-polarization Raman light and fluorescence combination scattering light 34；Spectrometer I 22 and Raman ICCD I 20 and
Spectrometer II 36 and Raman ICCD II 33 respectively obtain s polarization Raman light and fluorescence combination scattering light 23 and p-polarization Raman light and
The spectrum of fluorescence combination scattering light 34；Data processing is carried out by the program in industrial personal computer 41, p-polarization Raman light is obtained and fluorescence is multiple
Close the Raman diffused light modal data for the species of gases that scattering light 34 subtracts after s polarization Raman light and fluorescence combination scattering light 23.
Polarizing the negative laser of narrowband wavelength filter selected in light collector 24 and p-polarization collector 35 in s is
The NF01-532U-25 type Notch optical filter of Semrock company goes that 532nm wavelength laser is prevented to scatter light；Spectrometer I 20 and light
Spectrometer II 36 is the Surespectrum 500is/sm Imaging grating spectrometer of U.S. BRUKER company, selects 600g/mm light
Grid, slit width are set as 350 μm, and outlet is respectively provided with the drawing of the enhanced CCD of DH720-18F-03 of Andor company of Britain
Graceful ICCD camera 20 and Raman ICCD camera 33；Digital delay impulse generator 42 is the DG645 arteries and veins of U.S. STANFORD company
Rush delay generator；Taiwan, which is ground, to be inserted into two pieces of Raman ICCD cameras on the Intel mainboard in magnificent 610H type industrial personal computer 41 respectively and adopts
Truck I and Raman ICCD camera capture card II.
As shown in figure 8, wherein：A is the defeated of III l of I j of pulse output end mouth, II k of pulse output end mouth and pulse output end mouth
Signal waveform out；B is the signal output waveform of external trigger output port c；C is 16 time domain waveform of original laser beam；D is Raman
ICCD camera I 20 and II 33 inside of Raman ICCD camera gate waveform；F is p-polarization raman spectral signal time domain waveform；G is that s is inclined
Vibration Raman signal time domain waveform.Setting A1 is 0.1s；A, the frequency of B, C, D, E, F and G curve is 10Hz；B1 is 140 μm；D1
It is 140.14ns seconds；D2 is 40ns.
Claims (7)
1. a kind of polarization type gas Raman spectral measurement system, it is characterised in that：By polarization generation system (I), Optical Maser System
(II), horizontal polarization Raman system (III), polarization decomposing system (IV), vertical polarization Raman system (V), TT&C system (VI),
Combustion zone (1) and laser collector (2) composition, wherein polarization generation system (I), Optical Maser System (II), horizontal polarization Raman
System (III), polarization decomposing system (IV), vertical polarization Raman system (V), TT&C system (VI), combustion zone (1) and laser are received
Storage (2) is placed on the optical platform of same level；Polarize generation system (I), horizontal polarization Raman system (III) and vertically
Polarization Raman system (V) from placing front to back, and Optical Maser System (II) is placed in the left side of horizontal polarization Raman system (III), partially
Vibration decomposing system (IV) is placed in the right of horizontal polarization Raman system (III), and TT&C system (VI) is placed in vertical polarization Raman system
(V) the right；Combustion zone (1) is located at the front-left of polarization generation system (I) front-right and laser collector (2)；Polarization generates
The horizontal center line II (9) of system (I) and the horizontal center line I (4) of Optical Maser System (II) are vertically intersected on polarization and generate system
The center of 45 degree of reflecting mirrors (3) in system (I)；Polarize the horizontal center line II (9) and polarization decomposing system of generation system (I)
(IV) horizontal center line IV (27) is vertically intersected on the center of combustion zone (1)；In the level of vertical polarization Raman system (V)
The horizontal center line of heart line and polarization decomposing system (IV) is horizontal center line IV (27)；Horizontal polarization Raman system (III)
Horizontal center line III (26) and horizontal center line IV (27) are vertically intersected on polarized light beam splitting prism in polarization decomposing system (IV)
(31) center；The external trigger output port (c) of Raman ICCD camera I (20) is through special in horizontal (s) polarization Raman system (III)
It is connect with cable with the Q-switch external trigger input port (b) of laser controller (19) in Optical Maser System (II)；Horizontal (s) is inclined
The data-out port I (e) of Raman ICCD camera I (20) is through in private cable and TT&C system (VI) in vibration Raman system (III)
The data-in port II (i) of industrial personal computer (41) connects；Vertically (p) polarizes Raman ICCD camera II (33) in Raman system (V)
Data-in port I (h) of the data-out port II (g) through industrial personal computer (41) in private cable and TT&C system (VI) even
It connects；The pulse output end mouth I (j) of digital delay impulse generator (42) is through private cable and vertical (p) in TT&C system (VI)
Polarize external trigger input port II (f) connection of Raman ICCD camera II (33) in Raman system (V)；In TT&C system (VI)
The pulse output end mouth II (k) of digital delay impulse generator (42) polarizes Raman system (III) through private cable and horizontal (s)
The external trigger input port I (d) of middle Raman ICCD camera I (20) connects；Digital delay impulse generator in TT&C system (VI)
(42) and pumping lamp of the pulse output end mouth III (l) through laser controller (19) in private cable and Optical Maser System (II) outside
Trigger input port (a) connection.
2. polarization type gas Raman spectral measurement system according to claim 1, it is characterised in that：The polarization generates system
System (I) is made of 45 degree of reflecting mirrors (3), zero-th order waveplates (5), Wollaston prism (6), focus lamp (8), 45 degree of reflecting mirrors (3),
Zero-th order waveplates (5), Wollaston prism (6) and focus lamp (8) arrange from left to right, and 45 degree of reflecting mirrors (3), zero-th order waveplates
(5), the center line of Wollaston prism (6) and focus lamp (8) is overlapped with horizontal center line II (9)；The plating of 45 degree of reflecting mirrors (3)
Film working face is towards positive lower right.
3. polarization type gas Raman spectral measurement system according to claim 1, it is characterised in that：The Optical Maser System
(II) it is made of laser pulse stretcher (17), laser (18) and laser controller (19), wherein on laser controller (19)
Equipped with pumping lamp external trigger input port (a) and Q-switch external trigger input port (b)；Laser controller (19), laser (18)
With laser pulse stretcher (17) from rear to preceding arrangement, the laser exit and laser (18) laser of laser pulse stretcher (17)
The line of centres of outlet is horizontal center line I (4), and laser controller (19) is through laser private cable (15) and laser (18)
Connection.
4. polarization type gas Raman spectral measurement system according to claim 1, it is characterised in that：The horizontal polarization is drawn
Graceful system (III) is made of Raman ICCD camera I (20), adapter I (21), spectrometer I (22) and s polarization light collector (24),
Wherein Raman ICCD camera I (20) is equipped with external trigger output port (c), external trigger input port I (d) and data-out port
Ⅰ(e)；S polarizes light collector (24), spectrometer I (22), adapter I (21) and Raman ICCD camera I (20) and arranges from right-to-left
Column, Raman ICCD camera I (20) are affixed through adapter I (21) and the spectrum outlet of spectrometer I 22；The entrance of spectrometer I (22)
The line of centres of slit and s polarization light collector (24) is horizontal center line III (26).
5. polarization type gas Raman spectral measurement system according to claim 1, it is characterised in that：The polarization resolving system
System (IV) collects mirror (29) by scattering light and polarized light beam splitting prism (31) forms, and scattering light collects mirror (29) and polarized light beam splitting
In tandem, it is horizontal center line IV that scattering light collects mirror (29) and the line of centres of polarized light beam splitting prism (31) to prism (31)
(27)。
6. polarization type gas Raman spectral measurement system according to claim 1, it is characterised in that：The vertical polarization is drawn
Graceful system (V) is by Raman ICCD camera II (33), p-polarization light collector (35), spectrometer II (36) and adapter II (37) group
At wherein Raman ICCD camera II (33) is equipped with external trigger input port II (f) and data-out port II (g)；Raman
ICCD camera II (33) and spectrometer II (36) left-right situs, Raman ICCD camera II (33) is through adapter II (37) and spectrometer
The spectrum outlet of II (36) is affixed；P-polarization light collector (35) is placed in the front of spectrometer II (36), p-polarization light collector
(35) and in spectrometer II (36) line of centres of entrance slit is horizontal center line I (4).
7. polarization type gas Raman spectral measurement system according to claim 1, it is characterised in that：The TT&C system
(VI) it is made of display (40), industrial personal computer (41) and digital delayed-pulse generator (42), industrial personal computer (41) is equipped with Raman
ICCD camera capture card I (38) and Raman ICCD camera capture card II (39)；Raman ICCD camera capture card I (38) is equipped with number
According to input port I (h), Raman ICCD camera capture card II (39) is equipped with data-in port II (i)；Digital delay pulse hair
Raw device (42) are equipped with pulse output end mouth I (j), pulse output end mouth II (k) and pulse output end mouth III (l)；Display
(40) it is placed in industrial personal computer (41) above, digital delay impulse generator (42) is placed in industrial personal computer (41) right side.
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| CN118464868A (en) * | 2024-05-27 | 2024-08-09 | 江苏省特种设备安全监督检验研究院 | Raman spectrum-based gas component detection and analysis method and system |
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