CN108827940B - Three-dimensional laser Raman scattering spectrum measurement system - Google Patents
Three-dimensional laser Raman scattering spectrum measurement system Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 73
- 238000005259 measurement Methods 0.000 title abstract description 22
- 238000001228 spectrum Methods 0.000 title abstract description 6
- 230000003287 optical effect Effects 0.000 claims abstract description 85
- 238000002485 combustion reaction Methods 0.000 claims abstract description 65
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 claims abstract description 55
- 230000001360 synchronised effect Effects 0.000 claims abstract description 31
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 238000003384 imaging method Methods 0.000 claims description 47
- 238000001237 Raman spectrum Methods 0.000 claims description 35
- 230000005284 excitation Effects 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims 2
- 238000003745 diagnosis Methods 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 8
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- 238000005516 engineering process Methods 0.000 description 3
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 241001067739 Lotis Species 0.000 description 1
- 238000001530 Raman microscopy Methods 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012631 diagnostic technique Methods 0.000 description 1
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- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- 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
- G01N21/65—Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
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Abstract
The invention relates to a three-dimensional laser Raman scattering spectrum measurement system, belonging to the technical field of laser combustion diagnosis, wherein a pulse laser system is arranged right left of a three-dimensional surface focusing optical system, is positioned on the same central line with a 45-degree reflecting mirror and vertically intersected with the central line of the three-dimensional surface focusing optical system, and a synchronous output end of a pulse delay generator is connected with an external trigger input end of a pumping lamp of a laser controller; the synchronous output end of the pulse delay generator is connected with the motor control input end of the motor controller; the synchronous output end of the pulse delay generator is connected with the external trigger input end of the Raman ICCD camera; the external trigger output end of the Raman ICCD camera is connected with the external trigger input end of the Q switch of the laser controller; the Raman ICCD camera data output end is connected with the Raman ICCD camera acquisition card data input end, and the surface focusing sheet optical body optical device forms a three-dimensional surface focusing sheet optical body group in the three-dimensional combustion field; the invention can realize quantitative measurement of components, component mole fractions and temperatures of multiple species in a combustion field at three-dimensional accurate positions.
Description
Technical Field
The invention belongs to the technical field of laser combustion diagnosis, and particularly relates to a three-dimensional laser Raman scattering spectrum measurement system.
Background
Efficient clean and safe combustion is one of important research subjects for human beings. Combustion in both engines (including aerospace engines, transportation engines, etc.), power and heat supplied coal systems and gas turbines, and in the various types of combustors used in basic research, is required to explore ways and methods to further improve combustion conditions by various advanced combustion diagnostic techniques. Because of the problems of sealing, transient, explosion severity and the like of some combustion systems, various laser combustion diagnosis technologies are generally adopted to detect the combustion process at present. The technology can directly observe the combustion state of the combustion field, realize the accurate measurement of the temperature, the components, the concentration of the components, the fluidity, the flame structure and other high space-time resolution of the combustion field, and provide experimental verification for the simulation calculation of the theoretical value of combustion.
The detection of the concentration (mole fraction) and the region temperature of the main species in the complex combustion environment can be realized through the spectral measurement of the spontaneous vibration Raman scattering species of the laser, and the laser has the advantages of non-contact measurement, multi-species measurement synchronism, quantification, time (nanosecond level) and space (millimeter level) resolution capability. It has been widely used in various combustion systems such as in engine combustion chambers or in some closed or atmospheric environment. The gas mole fraction is obtained by simultaneous measurement of spontaneous oscillation stokes raman spectrum signals of gaseous species (nitrogen, oxygen, carbon dioxide, hydrocarbon fuel, hydrogen, carbon monoxide, etc.) having raman activity, and the temperature in the local space is obtained from the spontaneous oscillation stokes and anti-stokes raman spectrum signals of nitrogen. The optical measurement results and the numerical simulation calculation results are mutually verified and complemented, and basic data are provided for combustion theory and combustion test.
However, this technique is generally applied to raman spectral imaging measurement on a point (about 1mm in diameter) or a line (about 1mm in diameter, about tens of mm in length) or a plane (about tens of mm in length, about 1mm in width, and about tens of mm in height) in a certain area of a combustion field, and in order to obtain all spectral information of a three-dimensional combustion field space, it is necessary to manually shift the position of an excitation area of a laser focal point or line or plane, and finally form overall physical quantity information of the combustion field according to matrix data integration processing on the point or line or plane. Therefore, firstly, the problem of low measurement efficiency exists, secondly, the equal spacing between points or between lines or between surfaces is difficult to ensure, and the problem of non-real-time measurement, namely, the problem of asynchronous measurement information of a combustion field is also caused. Deviations in the spatial-temporal resolution obtained in this manner of optical measurement are difficult to compare with the results of numerical simulation.
Disclosure of Invention
The invention aims to provide a three-dimensional laser Raman scattering spectrum measurement technology, which is characterized in that an original point light source laser line is reflected into a surface focusing lens optical body optical device through a rotatable reflecting mirror driven by a precise micro-angle high-speed motor, an excitation surface is formed in a combustion field environment, and Raman spectrums of all the excited species are subjected to area array imaging by a species filter set with different wavelengths and a Raman ICCD camera. The motor drives the rotary reflecting mirror to the next angle position, the excitation surface formed in the excitation area is parallel to the excitation surface in the previous angle position and has the same size, and the same area array imaging is completed. And similarly, a series of parallel surface focusing excitation surfaces with high space-time resolution and the same size are formed in the combustion field by gradually rotating the reflecting mirror, and then synchronously imaged by the Raman spectrum imaging system, so that the mole fraction of the species and the quantitative measurement of the temperature in the three-dimensional space of the combustion field are real-time.
The invention consists of a pulse laser system I, a Raman spectrum surface imaging system II, a three-dimensional combustion field III, an industrial personal computer IV, a three-dimensional surface focusing optical system V and a pulse delay generator 1, wherein the pulse laser system I, the Raman spectrum surface imaging system II, the three-dimensional combustion field III, the industrial personal computer IV, the three-dimensional surface focusing optical system V and the pulse delay generator 1 are arranged on the same optical platform. The pulse laser system I is arranged right and left of the three-dimensional surface focusing optical system V, the horizontal center line of the pulse laser system I and the horizontal center line of the 45-degree reflecting mirror 24 in the three-dimensional surface focusing optical system V are arranged on the same left and right horizontal center line I4, and the left and right horizontal center line I4 and the front and rear horizontal center line 26 in the three-dimensional surface focusing optical system V are mutually and vertically intersected. The three-dimensional combustion field III is arranged on the right side of the Raman spectrum surface imaging system II and the left side of the industrial personal computer IV, and the three-dimensional surface focusing sheet optical body group 2 in the three-dimensional combustion field III is arranged right behind the surface focusing sheet optical body 19 in the three-dimensional surface focusing optical system V. The pulse delay generator 1 is arranged between the pulse laser system I and the Raman spectrum surface imaging system II. The pulse delay generator 1 is provided with a synchronous output port Ik, a synchronous output port II l and a synchronous output port IIIm. The synchronous output port Ik of the pulse delay generator 1 is connected with the pumping lamp external trigger input port o of the laser controller 3 in the pulse laser system I through a special cable; the synchronous output port II l of the pulse delay generator 1 is connected with the motor control input port t of the motor controller 23 through a special cable; the synchronous output port IIIm of the pulse delay generator 1 is connected with an external trigger input port p of a Raman ICCD camera 9 in a Raman spectrum surface imaging system II through a special cable; the external trigger output port Q of the Raman ICCD camera 9 in the Raman spectrum surface imaging system II is connected with the external trigger input port n of the Q switch of the laser controller 3 in the pulse laser system I through a special cable; the data output port r of the Raman ICCD camera 9 in the Raman spectrum surface imaging system II is connected with the data input port s of the Raman ICCD camera acquisition card 16 in the industrial personal computer IV through a special cable. The surface focusing patch optics 19 in the three-dimensional surface focusing optical system v form the three-dimensional surface focusing patch optics group 2 in the three-dimensional combustion field iii, the laser beam ii 17 in the three-dimensional surface focusing optical system v forms the surface focusing excitation area abcdefghij, that is, the surface focusing patch optics lz 1, the laser beam iii 18 in the three-dimensional surface focusing optical system v forms the surface focusing patch optics lz 2, and the laser beam iv 20 in the three-dimensional surface focusing optical system v forms the surface focusing patch optics nZn. In the area focus excitation region abcdefghij: line Aaf and line Bbe intersect at point ii, line Cch and line Ddg intersect at point ii j, rectangular plane i abcd and rectangular plane ii efgh are parallel and equal, and are parallel to species filter set 12, and left and right horizontal center line ii 13 intersects the centers of rectangular plane i abcd, rectangular plane ii efgh and line Eij; rectangular surface III bcgf is parallel and equal to rectangular surface IV adhe and is perpendicular to rectangular surface I abcd and rectangular surface II efgh; the centers of the rectangular plane ibabcd, the rectangular plane iiefgh, and the line Eij perpendicularly intersect the front-rear horizontal center line 26 in the three-dimensional plane focusing optical system v.
The pulse laser system I consists of a laser controller 3, a laser transmitter 5, a polaroid 6 and a laser pulse stretcher 7, wherein the laser transmitter 5, the polaroid 6 and the laser pulse stretcher 7 are sequentially arranged from left to right, the laser controller 3 is connected with the laser transmitter 5 through a special cable, and a Q switch external trigger input port n and a pump lamp external trigger input port o are arranged on the laser controller 3. The laser outlet of the laser transmitter 5, the center of the polaroid 6 and the outlet of the laser pulse stretcher 7 are positioned on the same left and right horizontal central line I4, and a laser beam I8 emitted from the outlet of the laser pulse stretcher 7 coincides with the left and right horizontal central line I4.
The raman spectrum surface imaging system II consists of a raman ICCD camera 9, an imaging lens 10, a laser filter 11 and a species filter set 12, wherein the raman ICCD camera 9, the imaging lens 10, the laser filter 11 and the species filter set 12 are sequentially arranged from left to right, an external trigger input port p, an external trigger output port q and a data output port r are arranged on the raman ICCD camera 9, and the species filter set 12 consists of six optical filters with different center wavelengths; the centers of the raman ICCD camera 9, the imaging lens 10, the laser filter 11, and the species filter set 12 are on the same horizontal center line ii 13.
The three-dimensional combustion field III consists of a combustion field environment and a three-dimensional surface focusing sheet light body group 2, wherein the combustion field environment is any combustion system, and the three-dimensional surface focusing sheet light body group 2 consists of n surface focusing sheet light bodies IZ 1 and surface focusing sheet light bodies II Z2. which are formed in a time-sharing mode and are arranged from left to right.
The industrial personal computer IV consists of a display 14, a host 15 and a Raman ICCD camera acquisition card 16, wherein the display 14 is arranged on the host 15, the Raman ICCD camera acquisition card 16 is arranged in the host 15, and the Raman ICCD camera acquisition card 16 is provided with a data input port s.
The three-dimensional surface focusing optical system V consists of a surface focusing lens optical body optical device 19, a precise motor 21, a motor controller 23, a 45-degree reflecting mirror 24 and a lens frame 25, wherein the surface focusing lens optical body optical device 19, the 45-degree reflecting mirror 24 and the lens frame 25 are sequentially arranged from back to front, and the 45-degree reflecting mirror 24 is fixedly connected to the right back of the lens frame 25. The precision motor 21 is disposed directly under the frame 25, and the precision motor 21 is vertically connected with the lower portion of the frame 25 via the output shaft 22. The motor controller 23 is disposed on the right side of the precision motor 21 and is connected with the precision motor 21 via a dedicated cable, and a motor control input port t is provided on the motor controller 23. The front-to-back centers of the face-focusing-sheet optics 19, 45-degree mirror 24 and frame 25 are on the same front-to-back horizontal centerline 26. Laser beam ii 17, laser beam iii 18, and laser beam iv 20 reflected by 45-degree mirror 24 are arranged in order from left to right.
The invention can realize quantitative measurement of components, component mole fractions and temperatures of multiple species in a combustion field at three-dimensional accurate positions.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional laser Raman scattering spectrometry system
FIG. 2 is a schematic diagram of a pulse laser system I
FIG. 3 is a schematic diagram of a Raman spectrum imaging system II
Fig. 4 is a schematic structural view of a three-dimensional surface focusing lens group 2
FIG. 5 is a schematic diagram of the structure of an industrial personal computer IV
FIG. 6 is a schematic diagram of a three-dimensional surface focusing optical system V
FIG. 7 is a schematic diagram of a species filter set 12
FIG. 8 is a synchronous timing diagram
Wherein: the laser system II, the Raman spectrum surface imaging system III, the three-dimensional combustion field IV, the industrial control computer V, the three-dimensional surface focusing optical system 1, the pulse delay generator 2, the three-dimensional surface focusing lens optical body group 3, the laser controller 4, the left and right horizontal center line I5, the laser emitter 6, the polarizing plate 7, the laser pulse stretcher 8, the laser beam I9, the Raman ICCD camera 10, the imaging lens 11, the laser filter 12, the species filter group 13, the left and right horizontal center line II 14, the display 15, the host computer 16, the Raman ICCD camera acquisition card 17, the laser beam II 18, the laser beam III 19, the surface focusing lens optical body 20, the laser beam IV 21, the precision motor 22, the output shaft 23, the motor controller 24.45-degree reflector 25, the lens holder 26, the front and back. The horizontal center line abcdefghij. the face focus excitation area K, the synchronous output port il, the synchronous output port im, the synchronous output port iii n.Q, the switch external trigger input port O, the pump lamp external trigger input port P, the external trigger input port Q, the external trigger output port r, the data output port s, the data input port t, the motor control input port I, the point ij, the point ii af., the line a be., the line B ch., the line C dg., the line D ij., the line F eh., the line G5225, the line I bf., the line J fg., the line K gc., the line M4886, the line O cd., the line Q gh., the line I abgh, the rectangular plane ii bcgf, the rectangular plane iii adhe, the rectangular plane iv Z1. face focus piece optics I Z2., the plane focus piece optics body ii, the face focus piece N
Detailed Description
The invention is described below with reference to the accompanying drawings.
As shown in fig. 1, the invention consists of a pulse laser system I, a Raman spectrum surface imaging system II, a three-dimensional combustion field III industrial personal computer IV, a three-dimensional surface focusing optical system V and a pulse delay generator 1, wherein the pulse laser system I, the Raman spectrum surface imaging system II, the three-dimensional combustion field III, the industrial personal computer IV, the three-dimensional surface focusing optical system V and the pulse delay generator 1 are arranged on the same optical platform. The pulse laser system I is arranged right and left of the three-dimensional surface focusing optical system V, the horizontal center line of the pulse laser system I and the horizontal center line of the 45-degree reflecting mirror 24 in the three-dimensional surface focusing optical system V are arranged on the same left and right horizontal center line I4, and the left and right horizontal center line I4 and the front and rear horizontal center line 26 in the three-dimensional surface focusing optical system V are mutually and vertically intersected. The three-dimensional combustion field III is arranged on the right side of the Raman spectrum surface imaging system II and the left side of the industrial personal computer IV, and the three-dimensional surface focusing sheet optical body group 2 in the three-dimensional combustion field III is arranged right behind the surface focusing sheet optical body 19 in the three-dimensional surface focusing optical system V. The pulse delay generator 1 is arranged between the pulse laser system I and the Raman spectrum surface imaging system II. The pulse delay generator 1 is provided with a synchronous output port Ik, a synchronous output port II l and a synchronous output port IIIm. The synchronous output port Ik of the pulse delay generator 1 is connected with the pumping lamp external trigger input port o of the laser controller 3 in the pulse laser system I through a special cable; the synchronous output port II l of the pulse delay generator 1 is connected with the motor control input port t of the motor controller 23 through a special cable; the synchronous output port IIIm of the pulse delay generator 1 is connected with an external trigger input port p of a Raman ICCD camera 9 in a Raman spectrum surface imaging system II through a special cable; the external trigger output port Q of the Raman ICCD camera 9 in the Raman spectrum surface imaging system II is connected with the external trigger input port n of the Q switch of the laser controller 3 in the pulse laser system I through a special cable; the data output port r of the Raman ICCD camera 9 in the Raman spectrum surface imaging system II is connected with the data input port s of the Raman ICCD camera acquisition card 16 in the industrial personal computer IV through a special cable. The surface focusing patch optics 19 in the three-dimensional surface focusing optical system v form the three-dimensional surface focusing patch optics group 2 in the three-dimensional combustion field iii, the laser beam ii 17 in the three-dimensional surface focusing optical system v forms the surface focusing excitation area abcdefghij, that is, the surface focusing patch optics lz 1, the laser beam iii 18 in the three-dimensional surface focusing optical system v forms the surface focusing patch optics lz 2, and the laser beam iv 20 in the three-dimensional surface focusing optical system v forms the surface focusing patch optics nZn. In the area focus excitation region abcdefghij: line Aaf and line Bbe intersect at point ii, line Cch and line Ddg intersect at point ii j, rectangular plane i abcd and rectangular plane ii efgh are parallel and equal, and are parallel to species filter set 12, and left and right horizontal center line ii 13 intersects the centers of rectangular plane i abcd, rectangular plane ii efgh and line Eij; rectangular surface III bcgf is parallel and equal to rectangular surface IV adhe and is perpendicular to rectangular surface I abcd and rectangular surface II efgh; the centers of the rectangular plane ibabcd, the rectangular plane iiefgh, and the line Eij perpendicularly intersect the front-rear horizontal center line 26 in the three-dimensional plane focusing optical system v.
As shown in fig. 2, the pulse laser system i is composed of a laser controller 3, a laser emitter 5, a polarizer 6 and a laser pulse stretcher 7, the laser emitter 5, the polarizer 6 and the laser pulse stretcher 7 are sequentially arranged from left to right, the laser controller 3 is connected with the laser emitter 5 through a special cable, and a Q-switch external trigger input port n and a pump lamp external trigger input port o are arranged on the laser controller 3. The laser outlet of the laser transmitter 5, the center of the polaroid 6 and the outlet of the laser pulse stretcher 7 are positioned on the same left and right horizontal central line I4, and a laser beam I8 emitted from the outlet of the laser pulse stretcher 7 coincides with the left and right horizontal central line I4.
As shown in fig. 3 and fig. 7, the raman spectrum surface imaging system ii is composed of a raman ICCD camera 9, an imaging lens 10, a laser filter 11 and a species filter set 12, wherein the raman ICCD camera 9, the imaging lens 10, the laser filter 11 and the species filter set 12 are sequentially arranged from left to right, an external trigger input port p, an external trigger output port q and a data output port r are arranged on the raman ICCD camera 9, and the species filter set 12 is composed of six filters with different center wavelengths; the centers of the raman ICCD camera 9, the imaging lens 10, the laser filter 11, and the species filter set 12 are on the same horizontal center line ii 13.
As shown in fig. 4, the three-dimensional combustion field iii is composed of a combustion field environment and a three-dimensional surface focusing sheet light body group 2, wherein the combustion field environment is any combustion system, and the three-dimensional surface focusing sheet light body group 2 is composed of n surface focusing sheet light bodies lz 1 and ii Z2..
As shown in fig. 5, the industrial personal computer iv is composed of a display 14, a host 15 and a raman ICCD camera acquisition card 16, wherein the display 14 is disposed on the host 15, the raman ICCD camera acquisition card 16 is disposed in the host 15, and the raman ICCD camera acquisition card 16 is provided with a data input port s.
As shown in fig. 6, the three-dimensional surface focusing optical system v is composed of a surface focusing lens optical body 19, a precision motor 21, a motor controller 23, a 45-degree reflecting mirror 24 and a mirror frame 25, wherein the surface focusing lens optical body 19, the 45-degree reflecting mirror 24 and the mirror frame 25 are sequentially arranged from back to front, and the 45-degree reflecting mirror 24 is fixedly connected to the right back of the mirror frame 25. The precision motor 21 is disposed directly under the frame 25, and the precision motor 21 is vertically connected with the lower portion of the frame 25 via the output shaft 22. The motor controller 23 is disposed on the right side of the precision motor 21 and is connected with the precision motor 21 via a dedicated cable, and a motor control input port t is provided on the motor controller 23. The front-to-back centers of the face-focusing-sheet optics 19, 45-degree mirror 24 and frame 25 are on the same front-to-back horizontal centerline 26. Laser beam ii 17, laser beam iii 18, and laser beam iv 20 reflected by 45-degree mirror 24 are arranged in order from left to right.
The specific connection process and requirements of the invention are as follows:
in the invention, a pulse laser system I, a Raman spectrum surface imaging system II, an industrial personal computer IV, a three-dimensional surface focusing optical system V and a pulse delay generator 1 are arranged on the same optical platform. In the three-dimensional combustion field iii, a combustion field environment, such as a burner, is arranged such that the three-dimensional surface focusing sheet light body group 2 is contained in the combustion field environment. The raman ICCD camera 9, the imaging lens 10, the laser filter 11, and the species filter set 12 are sequentially arranged right and left of the three-dimensional surface focusing sheet illuminant set 2 from left to right. The surface focusing sheet optics 19 are arranged right in front of the three-dimensional surface focusing sheet optics group 2, the 45-degree reflecting mirror 24 is arranged right in front of the surface focusing sheet optics 19, and the laser controller 3, the laser transmitter 5, the polarizing plate 6 and the laser pulse stretcher 7 are arranged right left of the 45-degree reflecting mirror 24 in order from left to right. The display 14 is placed on a host computer 15.
The special cables are respectively connected with: the synchronous output port Ik of the pulse delay generator 1 is connected to the pumping lamp external trigger input port o of the laser controller 3; the synchronous output port il of the pulse delay generator 1 to the motor control input port t of the motor controller 23; the synchronization output port im of the pulse delay generator 1 to the external trigger input port p of the raman ICCD camera 9. The external trigger output port Q of the Raman ICCD camera 9 is connected to the Q-switch external trigger input port n of the laser controller 3; the data output port r of the raman ICCD camera 9 to the data input port s of the raman ICCD camera acquisition card 16; a laser controller 3 to a laser emitter 5; motor controller 23 to precision motor 21.
The imaging lens 10 is screwed to the scattered light input port of the raman ICCD camera 9.
Preliminarily adjusting the center height of each optical device: such that the left-right horizontal centerline i 4 perpendicularly intersects the front-rear horizontal centerline 26 at the center of the 45-degree mirror 24. The left and right horizontal center lines II 13 and the front and rear horizontal center lines 26 vertically intersect at the center of the three-dimensional surface focusing lens light body group 2.
All the devices are electrified and preheated, the knob positions of all the instruments are set, all the measurement parameters of the instruments are input, and the main control program on the industrial personal computer IV is entered.
Accurately adjusting the central multidimensional position of each optical device: the laser transmitter 5 emits a low-energy 532nm visible light laser beam I8 for adjustment, adjusts the positions of the lenses in the polarizer 6, the 45-degree reflector 24, the laser pulse stretcher 7 and the surface focusing lens optics 19, and forms a surface focusing lens optics IZ 1 in the combustion field environment of the three-dimensional combustion field III. The laser filter 6 is removed. The surface focusing patch optical body lz 1 on the imaging surface focusing excitation area abcdefghij is measured by the real-time imaging functional mode of the raman ICCD camera 5. Fine tuning the height, side-to-side and front-to-back positions, tilt angles and pitch of all devices and frames ensures that the intensity values of the image appearing on the display 14 are evenly distributed in the vertical and horizontal directions. In this way, the surface focusing lens light bodies II Z2 and nZn are imaged respectively, and finally the same intensity value of the images of the surface focusing lens light bodies and the superposition of the positions on the screen are ensured.
Measuring a laser spontaneous vibration Raman scattering spectrum in an actual combustion field environment: the laser filter 6 is replaced to the original position. The laser filter 6 prevents strong laser scattered light on the surface focused excitation area abcdefghij from directly entering the raman ICCD camera 6, while affecting the measurement of weak spontaneous vibratory raman scattered light of the species to be measured. Individual filters of different wavelengths in the species filter set 12 allow raman scattered light of the same species as its wavelength to pass through and into the raman ICCD camera 16. Will burnThe burner in the burning field environment is adjusted to a state to be measured. The laser transmitter 5, the raman ICCD camera 9 are set to the measurement function mode. The laser emitter 5 is controlled to emit a pulsed laser beam I8 of experimental energy. According to the synchronous timing diagram shown in FIG. 8, the main program in the industrial personal computer IV completes the surface focusing lens light body IZ 1, the surface focusing lens light body IIZ 2 to the surface focusing lens light bodynAnd synchronously measuring Raman spectra of all species on Zn, and finally calculating the mole fraction and the regional temperature value of all the species on the three-dimensional space of the combustion field under the experimental condition through a data processing program in a main program.
Examples:
as shown in fig. 1, the laser controller 3 and the laser transmitter 5 in the pulse laser system i are LS2137 type laser system of the company LOTIS TII, white russia, which emits 532nm (nanometer) laser light, the spot diameter thereof is about 8mm (millimeters), the pulse width half maximum (FWHM) is about 7ns (nanoseconds), the frequency is 10Hz (hertz), the experimental laser energy is 380mJ (millijoule), and the debug laser energy is 50mJ; the laser light exiting from the outlet of the laser transmitter 5 first passes through the polarizer 6 of the linear polarization 1/2 wave plate, which has a diameter of 24.5mm. The position of the polaroid 6 is continuously rotated by collecting laser Raman spectrum of laboratory environment air before the experiment, the maximum value of the air Raman spectrum signal is found by a Raman spectrum surface imaging system II, and the position is fixed. And then laser passes through a self-made laser pulse stretcher 7, stretches the FWHM of the laser from 7ns to 35ns to form a laser beam I8, and is injected into the center of a 45-degree reflecting mirror 24 with a controllable rotation angle, then reflected into a self-made surface focusing sheet optical body optical device 19, and finally forms each surface focusing sheet optical body in a three-dimensional combustion field III.
In the area focus excitation region abcdefghij, the lines fa, jbf, hhd, and Lgc are 1mm, the lines Ida, geh, eij, bc, and fg are 6mm, and the lines Nab, oef, pcd, and Qgh are 25mm.
The center wavelengths of the 6 filters in the species filter set 12 are 660nm, 650nm, 620nm, 607nm, 580nm and 572nm, respectively, and the diameters thereof are 10mm; the laser filter 11 is NF01-532U-25 type Notch filter of Semrock company of Germany; the imaging lens 10 is 105mm, f2.8 lens of Nikon corporation of Japan, and the depth of field of the imaging lens 10 is larger than that of the surface focusing lens photosome III Zn; the raman ICCD camera 9 is a DH 720-18F-03-enhanced CCD camera from Andor, england.
The precision motor 21 and motor controller are selected from GVS211 galvanometer systems available from Thorlabs, U.S. The precision motor 21 is controlled to rotate the 45-degree reflecting mirror 24 to form 8 angles, and 8 parallel surface focusing sheet light bodies are formed in the three-dimensional combustion field III. The distance between the light bodies of the focusing sheets is 0.5mm. Pulse delay generator 1 is DG645 pulse delay generator from STANFORD corporation of usa. A Raman ICCD camera acquisition card 16 is inserted into an Intel mainboard in the Taiwan Yanghua 610H-type industrial personal computer IV.
As shown in fig. 8, wherein: a is the signal waveform of the synchronous output port II and the motor control input port t; b is the signal waveform of the synchronous output port Ik, the synchronous output port IIIm, the pump lamp external trigger input port o and the external trigger input port p; c is the signal waveform of the external trigger output port Q and the Q switch external trigger input port n; d is a laser time domain waveform (FWHM of 7 ns) output from the polarizing plate 6; e is the laser time domain waveform (FWHM is 35 ns) output from the laser pulse stretcher 7; f is a Raman signal waveform of the data output port r and the data input port s; g is the internal trigger signal waveform of the raman ICCD camera 9; a1 is the pulse interval of the precision motor 21, taking 0.4ms; b1 is the pulse interval of the laser beam I8, taking 0.1s; c1 Taking 140 μs (microseconds) for the optimal delay time of the laser; g1 is the gate delay time of the Raman ICCD camera 9, taking 140.14 mu s; g2 is the gate width of the raman ICCD camera 9, 40ns is taken; the frequency of the A waveform is 2.5KHz, and the frequencies of the B, C, D, E, F and G waveforms are all 10Hz.
Claims (6)
1. A three-dimensional laser raman scattering spectrometry system, characterized in that: the system consists of a pulse laser system (I), a Raman spectrum surface imaging system (II), a three-dimensional combustion field (III), an industrial personal computer (IV), a three-dimensional surface focusing optical system (V) and a pulse delay generator (1), wherein the pulse laser system I, the Raman spectrum surface imaging system (II), the three-dimensional combustion field (III), the industrial personal computer (IV), the three-dimensional surface focusing optical system (V) and the pulse delay generator (1) are arranged on the same optical platform; the pulse laser system (I) is arranged right and left of the three-dimensional plane focusing optical system (V), the horizontal center line of the pulse laser system (I) and the horizontal center line of the 45-degree reflecting mirror (24) in the three-dimensional plane focusing optical system (V) are arranged on the same left and right horizontal center lines I (4), and the left and right horizontal center lines I (4) and the front and rear horizontal center lines (26) in the three-dimensional plane focusing optical system (V) are mutually and vertically intersected; the three-dimensional combustion field (III) is arranged on the right side of the Raman spectrum surface imaging system (II) and the left side of the industrial personal computer (IV), and the three-dimensional surface focusing sheet optical body group (2) in the three-dimensional combustion field (III) is arranged right behind the surface focusing sheet optical body (19) in the three-dimensional surface focusing optical system (V); the pulse delay generator (1) is arranged between the pulse laser system (I) and the Raman spectrum surface imaging system (II); the pulse delay generator (1) is provided with a synchronous output port I (k), a synchronous output port II (l) and a synchronous output port III (m); the synchronous output port I (k) of the pulse delay generator (1) is connected with the external trigger input port (o) of the pumping lamp of the laser controller (3) in the pulse laser system (I) through a special cable; the synchronous output port II l of the pulse delay generator 1 is connected with a motor control input port (t) of the motor controller 23 through a special cable; the synchronous output port III (m) of the pulse delay generator (1) is connected with the external trigger input port (p) of the Raman ICCD camera (9) in the Raman spectrum surface imaging system (II) through a special cable; an external trigger output port (Q) of a Raman ICCD camera (9) in the Raman spectrum surface imaging system (II) is connected with an external trigger input port (n) of a Q switch of a laser controller (3) in the pulse laser system (I) through a special cable; the data output port (r) of the Raman ICCD camera (9) in the Raman spectrum surface imaging system (II) is connected with the data input port(s) of the Raman ICCD camera acquisition card (16) in the industrial personal computer (IV) through a special cable; a surface focusing sheet optical body optical device (19) in a three-dimensional surface focusing optical system (V) forms a three-dimensional surface focusing sheet optical body group (2) in a three-dimensional combustion field (III), a laser beam II (17) in the three-dimensional surface focusing optical system (V) forms a surface focusing excitation area (abcdefghij), namely a surface focusing sheet optical body I (Z1), a laser beam III (18) in the three-dimensional surface focusing optical system (V) forms a surface focusing sheet optical body II (Z2), and a laser beam IV (20) in the three-dimensional surface focusing optical system (V) forms a surface focusing sheet optical body n (Zn); in the area of the surface focus excitation (abcdefghij): line A (af) and line B (be) intersect at point I (i), line C (ch) and line D (dg) intersect at point II (j), rectangular plane I (abcd) and rectangular plane II (efgh) are parallel and equal, and are parallel to the species filter set (12), and left and right horizontal center line II (13) intersects with the centers of rectangular plane I (abcd), rectangular plane II (efgh) and line Eij; rectangular surface III (bcgf) is parallel and equal to rectangular surface IV (adhe) and perpendicular to rectangular surface I (abcd) and rectangular surface II (efgh); the centers of the rectangular surface I (abcd), the rectangular surface II (efgh) and the line E (ij) perpendicularly intersect with a front-rear horizontal center line (26) in the three-dimensional surface focusing optical system (V).
2. The three-dimensional laser raman scattering spectrometry system of claim 1, wherein: the pulse laser system (I) consists of a laser controller (3), a laser emitter (5), a polaroid (6) and a laser pulse stretcher (7), wherein the laser emitter (5), the polaroid (6) and the laser pulse stretcher (7) are sequentially arranged from left to right, the laser controller (3) is connected with the laser emitter 5 through a special cable, and a Q switch external trigger input port (n) and a pump lamp external trigger input port (o) are arranged on the laser controller (3); the laser outlet of the laser transmitter (5), the center of the polaroid (6) and the outlet of the laser pulse stretcher (7) are positioned on the same left and right horizontal central lines I (4), and a laser beam I (8) emitted by the outlet of the laser pulse stretcher (7) coincides with the left and right horizontal central lines I (4).
3. The three-dimensional laser raman scattering spectrometry system of claim 1, wherein: the Raman spectrum surface imaging system (II) consists of a Raman ICCD camera (9), an imaging lens (10), a laser filter (11) and a species filter set (12), wherein the Raman ICCD camera (9), the imaging lens (10), the laser filter (11) and the species filter set (12) are sequentially arranged from left to right, an external trigger input port (p), an external trigger output port (q) and a data output port (r) are arranged on the Raman ICCD camera (9), and the species filter set (12) consists of six optical filters with different center wavelengths; the centers of the Raman ICCD camera (9), the imaging lens (10), the laser filter (11) and the species filter set (12) are positioned on the same left and right horizontal center lines II (13).
4. The three-dimensional laser raman scattering spectrometry system of claim 1, wherein: the three-dimensional combustion field (III) is composed of a combustion field environment and a three-dimensional surface focusing sheet light body group (2), wherein the combustion field environment is any combustion system, and the three-dimensional surface focusing sheet light body group (2) is composed of n surface focusing sheet light bodies I (Z1) and surface focusing sheet light bodies II (Z2) which are arranged from left to right in a time-sharing mode.
5. The three-dimensional laser raman scattering spectrometry system of claim 1, wherein: the industrial personal computer (IV) consists of a display (14), a host (15) and a Raman ICCD camera acquisition card (16), wherein the display (14) is arranged on the host (15), the Raman ICCD camera acquisition card (16) is arranged in the host (15), and the Raman ICCD camera acquisition card (16) is provided with a data input port(s).
6. The three-dimensional laser raman scattering spectrometry system of claim 1, wherein: the three-dimensional surface focusing optical system (V) consists of a surface focusing lens optical body optical device (19), a precision motor (21), a motor controller (23), a 45-degree reflecting mirror (24) and a mirror bracket (25), wherein the surface focusing lens optical body optical device (19), the 45-degree reflecting mirror (24) and the mirror bracket (25) are sequentially arranged from back to front, and the 45-degree reflecting mirror (24) is fixedly connected to the right back of the mirror bracket (25); the precise motor (21) is arranged under the glasses frame (25), and the precise motor (21) is vertically connected with the lower part of the glasses frame (25) through the output shaft (22); the motor controller (23) is arranged on the right side of the precision motor (21) and is connected with the precision motor (21) through a special cable, and a motor control input port (t) is arranged on the motor controller (23); the front and back centers of the surface focusing lens photophobic optical device (19), the 45-degree reflecting mirror (24) and the mirror bracket (25) are positioned on the same front and back horizontal central line (26); laser beam II (17), laser beam III (18) and laser beam IV (20) reflected by 45-degree mirror 24 are arranged in this order from left to right.
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