CN108827940B - A three-dimensional laser Raman scattering spectrum measurement system - Google Patents

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

A three-dimensional laser Raman scattering spectrum measurement system

Technical field

The invention belongs to the technical field of laser combustion diagnosis, and specifically relates to a three-dimensional laser Raman scattering spectrum measurement system.

Background technique

Efficient, clean and safe combustion is one of the important research topics for mankind. Whether it is combustion in engines (including aerospace engines, transportation engines, etc.), coal systems and gas turbines for power and heating, or in various burners used in basic research, various advanced combustion diagnostic technologies are required. Means to explore ways and methods to further improve combustion conditions. Due to problems such as the closed nature, transient nature, and explosion severity of some combustion systems, currently people generally use various laser combustion diagnostic technologies to detect the combustion process. Through these technologies, the combustion state of the combustion field can be directly observed, and precise measurements of combustion field temperature, components and component concentrations, fluidity, and flame structure can be accurately measured with high spatial and temporal resolution, providing experimental verification for numerical simulation calculations of combustion theory.

Through laser spontaneous vibration Raman scattering species spectrum measurement, the concentration (mole fraction) and regional temperature of the main species in complex combustion environments can be detected, and it has non-contact measurement, multi-species measurement synchronization, quantification, and time (nanosecond level) and spatial (millimeter level) resolution capabilities. At present, it has been widely used in various combustion systems such as engine combustion chambers or in a closed or atmospheric environment. By simultaneously measuring the spontaneous vibration Stokes Raman spectrum signals of gaseous species with Raman activity (nitrogen, oxygen, carbon dioxide, hydrocarbon fuels, hydrogen, carbon monoxide, etc.), the gas mole fraction is obtained, and is determined by the spontaneous vibration of nitrogen Stokes and anti-Stokes Raman spectral signals are used to obtain the temperature in local space. These optical measurement results and numerical simulation calculation results verify and complement each other, providing basic data for combustion theory and combustion experiments.

But at present, this technology is generally applied to points (about 1mm in diameter) or lines (about 1mm in diameter and tens of millimeters long) or surfaces (about tens of millimeters long and about tens of millimeters wide) in a certain area of the combustion field. 1mm and about tens of millimeters in height), in order to obtain all the spectral information of the three-dimensional combustion field space, it is necessary to manually move the laser focus point or the excitation zone position of the line or surface, and finally press the point or line or The matrix data on the surface are integrated and processed to form the overall physical quantity information of the combustion field. First of all, there is the problem of low measurement efficiency. Secondly, it is difficult to ensure equal spacing between points or between lines or between surfaces. It also causes the problem of non-real-time measurement, that is, the problem of asynchronous measurement information of the combustion field. . The deviation in the spatial and temporal resolution obtained by this optical measurement method is difficult to compare with the calculation results of numerical simulation.

Contents of the invention

The purpose of the present invention is to provide a three-dimensional laser Raman scattering spectrum measurement technology. First, the original point light source laser line passes through a rotatable reflector driven by a precision micro-angle high-speed motor and is reflected into a surface focusing plate light body optical device. , an excitation surface is formed in the combustion field environment, and the Raman spectrum of each excited species is imaged by a species filter set with different wavelengths and a Raman ICCD camera to complete the area array imaging. The motor drives the rotating mirror to the next angular position, and the excitation surface formed in the excitation zone is parallel to and of the same size as the excitation surface at the previous angular position, completing the same area array imaging. By analogy, by gradually rotating the mirror, a series of parallel and identical-sized surface focusing excitation surfaces with high spatiotemporal resolution are formed in the combustion field, which are then synchronously imaged by the Raman spectroscopy imaging system to detect species in the three-dimensional space of the combustion field in real time. Quantitative measurements of mole fraction and temperature.

The invention consists of a pulse laser system I, a Raman spectrum surface imaging system II, a three-dimensional combustion field III, an industrial computer IV, a three-dimensional surface focusing optical system V and a pulse delay generator 1. The pulse laser system I, the Raman spectrum surface imaging system System II, three-dimensional combustion field III, industrial computer IV, three-dimensional surface focusing optical system V and pulse delay generator 1 are placed on the same optical platform. The pulse laser system I is placed directly to the 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 reflector 24 in the three-dimensional surface focusing optical system V are on the same left and right horizontal center line I4 On the top, the left and right horizontal center lines I4 intersect perpendicularly with the front and rear horizontal center lines 26 of the three-dimensional surface focusing optical system V. The three-dimensional combustion field III is placed on the right side of the Raman spectrum surface imaging system II and the left side of the industrial computer IV. The three-dimensional surface focusing piece light body group 2 in the three-dimensional burning field III is placed on the middle surface focusing piece of the three-dimensional surface focusing optical system V. Directly behind the light body optic 19. The pulse delay generator 1 is placed between the pulse laser system I and the Raman spectrum imaging system II. The pulse delay generator 1 is provided with a synchronous output port Ik, a synchronous output port IIl and a synchronous output port IIIm. The synchronous output port Ik of the pulse delay generator 1 is connected to the external trigger input port o of the pump lamp of the laser controller 3 in the pulse laser system I via a dedicated cable; the synchronous output port IIl of the pulse delay generator 1 is connected to the motor control via a dedicated cable The motor control input port t of the generator 23 is connected; the synchronization output port IIIm of the pulse delay generator 1 is connected to the external trigger input port p of the Raman ICCD camera 9 in the Raman spectrum surface imaging system II through a dedicated cable; Raman spectrum surface imaging The external trigger output port q of the Raman ICCD camera 9 in the system II is connected to the Q switch external trigger input port n of the laser controller 3 in the pulse laser system I via a dedicated cable; the Raman ICCD camera 9 in the Raman spectral surface imaging system II The data output port r is connected to the data input port s of the Raman ICCD camera acquisition card 16 in the industrial computer IV via a special cable. The surface focusing sheet light body optics 19 in the three-dimensional surface focusing optical system V form a three-dimensional surface focusing sheet light body group 2 in the three-dimensional combustion field III, and the laser beam II 17 in the three-dimensional surface focusing optical system V forms a surface focusing excitation area abcdefghij, That is, the surface focusing sheet light body IZ1 is formed, the laser beam III18 in the three-dimensional surface focusing optical system V forms the surface focusing sheet light body IIZ2, and the laser beam IV20 in the three-dimensional surface focusing optical system V forms the surface focusing sheet light body nZn. In the surface focusing excitation area abcdefghij: line Aaf and line Bbe intersect at point Ⅰi, line Cch and line Ddg intersect at point Ⅱj, rectangular surface Ⅰabcd and rectangular surface Ⅱefgh are parallel and equal, and parallel to species filter set 12, horizontal on the left and right Center line II13 intersects the center of rectangular surface Iabcd, rectangular surface IIefgh and line Eij; rectangular surface IIIbcgf is parallel and equal to rectangular surface IVadhe, and perpendicular to rectangular surface Iabcd and rectangular surface IIefgh; rectangular surface Iabcd, rectangular surface IIefgh and line Eij The center intersects perpendicularly with the front and rear horizontal center lines 26 in the three-dimensional surface focusing optical system V.

The pulse laser system I is composed of a laser controller 3, a laser transmitter 5, a polarizer 6 and a laser pulse stretcher 7. The laser transmitter 5, the polarizer 6 and the laser pulse stretcher 7 are arranged in sequence from left to right. The laser controller 3 is connected to the laser transmitter 5 via a special cable. The laser controller 3 is provided with a Q switch external trigger input port n and a pump lamp external trigger input port o. The laser outlet of the laser transmitter 5, the center of the polarizer 6 and the outlet of the laser pulse stretcher 7 are on the same left and right horizontal center line I4. The laser beam I8 emitted from the outlet of the laser pulse stretcher 7 coincides with the left and right horizontal center line I4. .

The Raman spectral 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. The Raman ICCD camera 9, the imaging lens 10, the laser filter 11 The species filter set 12 is arranged in sequence from left to right. The Raman ICCD camera 9 is provided with an external trigger input port p, an external trigger output port q and a data output port r. The species filter set 12 consists of six different 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 left and right horizontal center line II 13.

The three-dimensional combustion field III is composed of a combustion field environment and a three-dimensional surface focusing sheet light body group 2. The combustion field environment is any kind of combustion system. The three-dimensional surface focusing sheet light body group 2 is arranged from left to right formed by time sharing. It is composed of n surface focusing sheet light bodies IZ1, surface focusing sheet light bodies IIZ2... surface focusing sheet light bodies nZn.

The industrial computer IV is composed of a display 14, a host 15 and a Raman ICCD camera capture card 16. The display 14 is placed on the host 15. The host 15 is equipped with a Raman ICCD camera capture card 16 and a Raman ICCD camera capture card 16. Equipped with data input port s.

The three-dimensional surface focusing optical system V is composed of a surface focusing piece light body optic 19, a precision motor 21, a motor controller 23, a 45 degree reflector 24 and a frame 25. The surface focusing piece light body optic 19, 45 degree The reflector 24 and the frame 25 are arranged in sequence from back to front, and the 45-degree reflector 24 is fixed directly behind the frame 25 . The precision motor 21 is placed directly below the mirror frame 25, and the precision motor 21 is vertically connected to the lower part of the mirror frame 25 through the output shaft 22. The motor controller 23 is placed on the right side of the precision motor 21 and is connected to the precision motor 21 via a special cable. The motor controller 23 is provided with a motor control input port t. The front and rear centers of the surface focusing sheet optical body optic 19, the 45-degree reflector 24 and the frame 25 are on the same front and rear horizontal center line 26. The laser beam II17, the laser beam III18 and the laser beam IV20 reflected by the 45-degree reflector 24 are arranged in sequence from left to right.

The invention can realize quantitative measurement of multi-species components, component mole fractions and temperature at three-dimensional precise positions in the combustion field.

Description of drawings

Figure 1 is a schematic structural diagram of the three-dimensional laser Raman scattering spectrum measurement system.

Figure 2 is a schematic structural diagram of the pulse laser system I

Figure 3 is a schematic structural diagram of the Raman spectrum imaging system II.

Figure 4 is a schematic structural diagram of the three-dimensional surface focusing sheet light body group 2

Figure 5 is a schematic structural diagram of industrial computer IV

Figure 6 is a schematic structural diagram of the three-dimensional surface focusing optical system V

Figure 7 is a schematic structural diagram of the species filter set 12

Figure 8 shows the synchronization timing diagram

Among them: Ⅰ. Pulse laser system Ⅱ. Raman spectrum surface imaging system Ⅲ. Three-dimensional combustion field Ⅳ. Industrial computer V. Three-dimensional surface focusing optical system 1. Pulse delay generator 2. Three-dimensional surface focusing sheet light body group 3. Laser control 4. Left and right horizontal center lines I 5. Laser emitter 6. Polarizer 7. Laser pulse stretcher 8. Laser beam I 9. Raman ICCD camera 10. Imaging lens 11. Laser filter 12. Species filter Group 13. Left and right horizontal center lines II 14. Display 15. Host 16. Raman ICCD camera capture card 17. Laser beam II 18. Laser beam III 19. Surface focusing sheet light body optics 20. Laser beam IV 21. Precision motor 22. Output shaft 23. Motor controller 24. 45-degree reflector 25. Mirror frame 26. Front and rear horizontal center line abcdefghij. Surface focus excitation area k. Synchronous output port Ⅰ l. Synchronous output port Ⅱ m. Synchronous output port Ⅲ n. Outside Q switch Trigger input port o. Pump lamp external trigger input port p. External trigger input port q. External trigger output port r. Data output port s. Data input port t. Motor control input port i. Point Ⅰ j. Point Ⅱ af. Line A be. Line B ch. Line C dg. Line D ij. Line E ae. Line F eh. Line G hd. Line H da. Line I bf. Line J fg. Line Kgc. Line L cb. Line M ab. Line N ef. Line O cd. Line P gh. Line Q abcd. Rectangular surface I efgh. Rectangular surface II bcgf. Rectangular surface III adhe. Rectangular surface IV Z1. Surface focusing sheet light body Ⅰ Z2. Surface focusing sheet light body Ⅱ Zn .Surface focusing sheet light body n

Detailed ways

The present invention will be described below with reference to the accompanying drawings.

As shown in Figure 1, the present invention consists of a pulse laser system I, a Raman spectrum surface imaging system II, a three-dimensional combustion field III industrial computer IV, a three-dimensional surface focusing optical system V and a pulse delay generator 1. The pulse laser system II, Raman spectral surface imaging system II, three-dimensional combustion field III, industrial computer IV, three-dimensional surface focusing optical system V and pulse delay generator 1 are placed on the same optical platform. The pulse laser system I is placed directly to the 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 reflector 24 in the three-dimensional surface focusing optical system V are on the same left and right horizontal center line I4 On the top, the left and right horizontal center lines I4 intersect perpendicularly with the front and rear horizontal center lines 26 of the three-dimensional surface focusing optical system V. The three-dimensional combustion field III is placed on the right side of the Raman spectrum surface imaging system II and the left side of the industrial computer IV. The three-dimensional surface focusing piece light body group 2 in the three-dimensional burning field III is placed on the middle surface focusing piece of the three-dimensional surface focusing optical system V. Directly behind the light body optic 19. The pulse delay generator 1 is placed between the pulse laser system I and the Raman spectrum imaging system II. The pulse delay generator 1 is provided with a synchronous output port Ik, a synchronous output port IIl and a synchronous output port IIIm. The synchronous output port Ik of the pulse delay generator 1 is connected to the external trigger input port o of the pump lamp of the laser controller 3 in the pulse laser system I through a dedicated cable; the synchronous output port IIl of the pulse delay generator 1 is connected to the motor control via a dedicated cable The motor control input port t of the generator 23 is connected; the synchronization output port IIIm of the pulse delay generator 1 is connected to the external trigger input port p of the Raman ICCD camera 9 in the Raman spectrum surface imaging system II through a dedicated cable; Raman spectrum surface imaging The external trigger output port q of the Raman ICCD camera 9 in the system II is connected to the Q switch external trigger input port n of the laser controller 3 in the pulse laser system I via a special cable; the Raman ICCD camera 9 in the Raman spectral surface imaging system II The data output port r is connected to the data input port s of the Raman ICCD camera acquisition card 16 in the industrial computer IV via a special cable. The surface focusing sheet light body optics 19 in the three-dimensional surface focusing optical system V form a three-dimensional surface focusing sheet light body group 2 in the three-dimensional combustion field III, and the laser beam II 17 in the three-dimensional surface focusing optical system V forms a surface focusing excitation area abcdefghij, That is, the surface focusing sheet light body IZ1 is formed, the laser beam III18 in the three-dimensional surface focusing optical system V forms the surface focusing sheet light body IIZ2, and the laser beam IV20 in the three-dimensional surface focusing optical system V forms the surface focusing sheet light body nZn. In the surface focusing excitation area abcdefghij: line Aaf and line Bbe intersect at point Ⅰi, line Cch and line Ddg intersect at point Ⅱj, rectangular surface Ⅰabcd and rectangular surface Ⅱefgh are parallel and equal, and parallel to species filter set 12, horizontal on the left and right Center line II13 intersects the center of rectangular surface Iabcd, rectangular surface IIefgh and line Eij; rectangular surface IIIbcgf is parallel and equal to rectangular surface IVadhe, and perpendicular to rectangular surface Iabcd and rectangular surface IIefgh; rectangular surface Iabcd, rectangular surface IIefgh and line Eij The center intersects perpendicularly with the front and rear horizontal center lines 26 in the three-dimensional surface focusing optical system V.

As shown in Figure 2, the pulse laser system I is composed of a laser controller 3, a laser transmitter 5, a polarizer 6 and a laser pulse stretcher 7. The laser transmitter 5, the polarizer 6 and the laser pulse stretcher 7 are automatically Arranged from left to right, the laser controller 3 is connected to the laser transmitter 5 via a special cable. The laser controller 3 is provided with a Q-switch external trigger input port n and a pump lamp external trigger input port o. The laser outlet of the laser transmitter 5, the center of the polarizer 6 and the outlet of the laser pulse stretcher 7 are on the same left and right horizontal center line I4. The laser beam I8 emitted from the outlet of the laser pulse stretcher 7 coincides with the left and right horizontal center line I4. .

As shown in Figures 3 and 7, the Raman spectral 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. The Raman ICCD camera 9, The imaging lens 10, the laser filter 11 and the species filter group 12 are arranged in order from left to right. The Raman ICCD camera 9 is provided with an external trigger input port p, an external trigger output port q and a data output port r. Species The filter set 12 is composed of six filters with different center wavelengths; the centers of the Raman ICCD camera 9, imaging lens 10, laser filter 11 and species filter set 12 are on the same left and right horizontal center line II 13 .

As shown in Figure 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. The combustion field environment is any kind of combustion system, and the three-dimensional surface focusing sheet light body group 2 is formed by time sharing. It consists of n surface focusing sheet light bodies IZ1, surface focusing sheet light bodies IIZ2, and surface focusing sheet light bodies nZn arranged from left to right.

As shown in Figure 5, the industrial computer IV is composed of a display 14, a host 15 and a Raman ICCD camera capture card 16. The display 14 is placed on the host 15. The host 15 is equipped with a Raman ICCD camera capture card 16. Man ICCD camera capture card 16 is equipped with data input port s.

As shown in Figure 6, the three-dimensional surface focusing optical system V is composed of a surface focusing sheet light body optic 19, a precision motor 21, a motor controller 23, a 45-degree reflector 24 and a frame 25. The surface focusing sheet light body The optical device 19, the 45-degree reflector 24 and the frame 25 are arranged in sequence from back to front, and the 45-degree reflector 24 is fixed directly behind the frame 25. The precision motor 21 is placed directly below the mirror frame 25, and the precision motor 21 is vertically connected to the lower part of the mirror frame 25 through the output shaft 22. The motor controller 23 is placed on the right side of the precision motor 21 and is connected to the precision motor 21 via a special cable. The motor controller 23 is provided with a motor control input port t. The front and rear centers of the surface focusing sheet optical body optic 19, the 45-degree reflector 24 and the frame 25 are on the same front and rear horizontal center line 26. The laser beam II17, the laser beam III18 and the laser beam IV20 reflected by the 45-degree reflector 24 are arranged in sequence from left to right.

The specific connection process and requirements of the present invention are as follows:

In the present invention, the pulse laser system I, the Raman spectrum surface imaging system II, the industrial computer IV, the three-dimensional surface focusing optical system V and the pulse delay generator 1 are placed on the same optical platform. Arrange the combustion field environment, such as the burner, in the three-dimensional combustion field III so that the three-dimensional surface focusing sheet light body group 2 is included in the combustion field environment. The Raman ICCD camera 9, the imaging lens 10, the laser filter 11 and the species filter group 12 are arranged in sequence from left to right and placed directly to the left of the three-dimensional surface focusing sheet light body group 2. The surface focusing sheet light body optics 19 are placed directly in front of the three-dimensional surface focusing sheet light body group 2, the 45-degree reflector 24 is placed directly in front of the surface focusing sheet light body optics 19, the laser controller 3 and the laser transmitter 5 , the polarizer 6 and the laser pulse stretcher 7 are arranged in sequence from left to right and placed directly on the left of the 45-degree reflector 24. The display 14 is placed on the host computer 15 .

Use special cables to connect respectively: the synchronous output port Ik of the pulse delay generator 1 to the pump lamp external trigger input port o of the laser controller 3; the synchronous output port IIl of the pulse delay generator 1 to the motor control input of the motor controller 23 Port t; 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 is connected to the data input port s of the Raman ICCD camera acquisition card 16; laser Controller 3 to laser transmitter 5; motor controller 23 to precision motor 21.

The imaging lens 10 is connected to the scattered light input port of the Raman ICCD camera 9 through threads.

Preliminarily adjust the center height of each optical device: make the left and right horizontal center lines I4 and the front and rear horizontal center lines 26 perpendicularly intersect at the center of the 45-degree reflector 24. The left and right horizontal center lines II13 and the front and rear horizontal center lines 26 intersect perpendicularly at the center of the three-dimensional surface focusing sheet light body group 2.

All equipment is powered on and preheated, the knob positions of each instrument are set, the measurement parameters of the instrument are input, and the main control program on the industrial computer IV is entered.

Accurately adjust the multi-dimensional position of the center of each optical device: the laser transmitter 5 emits the low-energy 532nm (nanometer) visible light laser beam I8 for debugging, adjust the polarizer 6, the 45-degree mirror 24, the laser pulse stretcher 7 and the surface focusing plate Each lens position in the light body optical device 19 forms a surface focusing sheet light body IZ1 in the combustion field environment of the three-dimensional combustion field III. Remove laser filter 6. Through the real-time imaging function mode of the Raman ICCD camera 5, the surface focusing sheet light body IZ1 on the imaging surface focusing excitation area abcdefghij is measured. Fine-tune the height, left and right, front and rear positions, inclination and pitch of all equipment and frames to ensure that the intensity values of the image appearing on the display 14 are evenly distributed in the vertical and horizontal directions. According to this method, the surface focusing sheet light body IIZ2 and the surface focusing sheet light body nZn are respectively imaged to ultimately ensure that the intensity values of the images of the surface focusing sheet light bodies are the same and their positions on the screen coincide.

Measure the laser spontaneous vibration Raman scattering spectrum in the actual combustion field environment: Replace the laser filter 6 to its original position. The laser filter 6 prevents the strong laser scattered light in the surface focused excitation area abcdefghij from directly entering the Raman ICCD camera 6 and affects the measurement of the weak spontaneous vibration Raman scattered light of the species to be measured. The individual filters of different wavelengths in the species filter set 12 allow the Raman scattered light of species with the same wavelength to pass through and enter the Raman ICCD camera 16 . Adjust the burner in the combustion field environment to the state to be tested. Set the laser transmitter 5 and the Raman ICCD camera 9 to the measurement function mode. The laser transmitter 5 is controlled to emit a pulsed laser beam I8 of experimental energy. According to the synchronization timing diagram shown in Figure 8, the main program in the industrial computer IV completes the synchronous measurement of the Raman spectra of various species on the surface focusing plate light body IZ1, the surface focusing plate light body IIZ2, and the surface focusing plate light body n Zn , through the data processing program in the main program, the mole fraction and regional temperature value of each species in the three-dimensional space of the combustion field under this experimental condition are finally calculated.

Example:

As shown in Figure 1, the laser controller 3 and laser transmitter 5 in the pulse laser system I are the LS2137 laser system of the Belarusian LOTISTII company. It emits 532nm (nanometer) laser, and its spot diameter is about 8mm (millimeter). The width at half maximum (FWHM) is about 7ns (nanoseconds), the frequency is 10Hz (Hertz), the experimental laser energy is 380mJ (millijoules), and the debugging laser energy is 50mJ; the laser emitted from the exit of the laser transmitter 5 first passes through The diameter of the polarizing plate 6 of the linearly polarized 1/2 wave plate is 24.5 mm. Before the experiment, the laser Raman spectrum of the laboratory ambient air was collected, the position of the polarizer 6 was continuously rotated, the maximum value of the air Raman spectrum signal was found through the Raman spectrum surface imaging system II, and the position was fixed. Afterwards, the laser passes through the homemade laser pulse stretcher 7, which broadens the FWHM of the laser from the original 7ns to 35ns, forming the laser beam I8, and is injected into the center of the 45-degree reflector 24 with a controllable rotation angle, and then reflected into the homemade laser pulse stretcher 7. In the surface focusing sheet light body optical device 19, each surface focusing sheet light body is finally formed in the three-dimensional combustion field III.

In the surface focus excitation area abcdefghij, the lines Fae, Jbf, Hhd and Lgc are all 1mm, the lines Ida, Geh, Eij, bc and fg are all 6mm, the lines Nab, Oef, Pcd, Line Qgh is 25mm.

The center wavelengths of the six filters in the species filter set 12 are 660nm, 650nm, 620nm, 607nm, 580nm and 572nm respectively, and their diameters are all 10mm; the laser filter 11 is NF01-532U- from Semrock Company of Germany. 25-type Notch filter; imaging lens 10 is a 105mm, f2.8 lens from Nikon Company of Japan. The depth of field of imaging lens 10 is greater than that of the surface focusing film IIIZn; Raman ICCD camera 9 is DH720-18F-03 from Andor Company of England. Enhanced CCD camera.

The precision motor 21 and the motor controller use the GVS211 galvanometer system of the American Thorlabs company. The precision motor 21 is controlled to rotate the 45-degree reflector 24 to form 8 angles, forming 8 mutually parallel surface focusing light bodies in the three-dimensional combustion field III. The distance between the light bodies of the focusing sheets on each side is 0.5mm. Pulse delay generator 1 is the DG645 pulse delay generator of American STANFORD Company. The Raman ICCD camera capture card 16 is inserted into the Intel motherboard of the Advantech 610H industrial computer IV in Taiwan, China.

As shown in Figure 8, where: A is the signal waveform of the synchronous output port IIl and the motor control input port t; B is the synchronous output port Ik, the synchronous output port IIIm, the pump lamp external trigger input port o, and the external trigger input port The signal waveform of p; C is the signal waveform of the external trigger output port q and the Q switch external trigger input port n; D is the laser time domain waveform output from the polarizer 6 (FWHM is 7ns); E is the laser pulse stretcher 7 The output laser time domain waveform (FWHM is 35ns); F is the 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 , taken as 0.4ms; B1 is the pulse interval of laser beam I8, taken as 0.1s; C1 is the optimal delay time of the laser, taken as 140μs (microseconds); G1 is the gate delay time of Raman ICCD camera 9, taken as 140.14μs; G2 is the gate width of the Raman ICCD camera 9, which is taken as 40ns; 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 spectrum measurement system, characterized by: consisting of a pulse laser system (Ⅰ), a Raman spectrum surface imaging system (Ⅱ), a three-dimensional combustion field (Ⅲ), an industrial computer (Ⅳ), and a three-dimensional surface It consists of focusing optical system (V) and pulse delay generator (1), pulse laser system I (I), Raman spectrum imaging system (II), three-dimensional combustion field (III), industrial computer (IV), three-dimensional surface focusing The optical system (V) and the pulse delay generator (1) are placed on the same optical platform; the pulse laser system (I) is placed directly to the left of the three-dimensional surface focusing optical system (V), with the horizontal center line of the pulse laser system (I) The horizontal center line of the 45-degree reflector (24) in the three-dimensional surface focusing optical system (V) is on the same left and right horizontal center line I (4), and the left and right horizontal center lines I (4) and the three-dimensional surface focusing optical system (V) are ) in the front and rear horizontal center lines (26) perpendicularly intersect each other; the three-dimensional combustion field (Ⅲ) is placed on the right of the Raman spectrum imaging system (Ⅱ) and the left of the industrial computer (Ⅳ), and the three-dimensional combustion field (Ⅲ) The three-dimensional surface focusing piece light body group (2) is placed directly behind the three-dimensional surface focusing piece light body optics (19) in the three-dimensional surface focusing optical system (V); the pulse delay generator (1) is placed in the pulse laser system ( Between I) and the Raman spectrum 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 to the pump lamp external trigger input port (o) of the laser controller (3) in the pulse laser system (I) via a dedicated cable; the pulse delay occurs The synchronous output port II of the generator 1 is connected to the motor control input port (t) of the motor controller 23 via a dedicated cable; the synchronous output port III (m) of the pulse delay generator (1) is connected to the Raman spectrum imaging system via a dedicated cable The external trigger input port (p) of the Raman ICCD camera (9) in (II) is connected; the external trigger output port (q) of the Raman ICCD camera (9) in the Raman spectral plane imaging system (II) is connected to The Q-switch external trigger input port (n) of the laser controller (3) in the pulse laser system (I) is connected; the data output port (r) of the Raman ICCD camera (9) in the Raman spectral plane imaging system (II) is connected. The special cable is connected to the data input port (s) of the Raman ICCD camera acquisition card (16) in the industrial computer (IV); the surface focusing sheet light body optics (19) in the three-dimensional surface focusing optical system (V) burns in the three-dimensional A three-dimensional surface focusing sheet light body group (2) is formed in the field (III), and the laser beam II (17) in the three-dimensional surface focusing optical system (V) forms a surface focusing excitation area (abcdefghij), that is, a surface focusing sheet light body I is formed. (Z1), the laser beam III (18) in the three-dimensional surface focusing optical system (V) forms a surface focusing sheet light body II (Z2), and the laser beam IV (20) in the three-dimensional surface focusing optical system (V) forms a surface focusing Sheet light body n (Zn); in the surface focusing excitation region (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), the rectangular surface Ⅰ(abcd) and the rectangular surface Ⅱ(efgh) are parallel and equal, and parallel to the species filter set (12), and the left and right horizontal center lines Ⅱ(13) and the rectangular surface Ⅰ(abcd), The centers of rectangular surface II (efgh) and line Eij) intersect; 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); rectangular surface The centers of I (abcd), rectangular surface II (efgh) and line E (ij) intersect perpendicularly with the front and rear horizontal center lines (26) in the three-dimensional surface focusing optical system (V). 2. The three-dimensional laser Raman scattering spectrum measurement system according to claim 1, characterized in that: the pulse laser system (I) consists of a laser controller (3), a laser transmitter (5), and a polarizer (6 ) and a laser pulse stretcher (7). The laser transmitter (5), polarizer (6) and laser pulse stretcher (7) are arranged in sequence from left to right. The laser controller (3) communicates with the laser transmitter through a special cable. 5, the laser controller (3) is provided with a Q switch external trigger input port (n) and a pump lamp external trigger input port (o); the laser outlet of the laser transmitter (5) and the polarizer (6) The center and the outlet of the laser pulse stretcher (7) are on the same left and right horizontal center line I (4). The laser beam I (8) emitted from the outlet of the laser pulse stretcher (7) is consistent with the left and right horizontal center line I (4). coincide. 3. The three-dimensional laser Raman scattering spectrum measurement system according to claim 1, characterized in that: the Raman spectrum surface imaging system (II) consists of a Raman ICCD camera (9), an imaging lens (10), a laser Composed of filter (11) and species filter set (12), Raman ICCD camera (9), imaging lens (10), laser filter (11) and species filter set (12) from left to Arranged in order from the right, the Raman ICCD camera (9) is equipped with an external trigger input port (p), an external trigger output port (q) and a data output port (r), and the species filter set (12) consists of six different The central wavelength filter is composed of; the centers of the Raman ICCD camera (9), imaging lens (10), laser filter (11) and species filter set (12) are on the same left and right horizontal center line II (13 )superior. 4. The three-dimensional laser Raman scattering spectrum measurement system according to claim 1, characterized in that: the three-dimensional combustion field (III) is composed of a combustion field environment and a three-dimensional surface focusing plate light body group (2), and the combustion field The environment is any kind of combustion system. The three-dimensional surface focusing plate light body group (2) consists of n surface focusing plate light bodies I (Z1) and surface focusing plate light bodies II (Z2) formed in time sharing and arranged from left to right. ....The surface focusing piece is composed of light body n (Zn). 5. The three-dimensional laser Raman scattering spectrum measurement system according to claim 1, characterized in that: the industrial computer (IV) consists of a display (14), a host (15) and a Raman ICCD camera acquisition card (16) It consists of a display (14) placed on a host (15), a Raman ICCD camera capture card (16) inside the host (15), and the Raman ICCD camera capture card (16) is provided with a data input port (s). 6. The three-dimensional laser Raman scattering spectrum measurement system according to claim 1, characterized in that: the three-dimensional surface focusing optical system (V) consists of a surface focusing plate light body optic (19) and a precision motor (21) , motor controller (23), 45-degree reflector (24) and lens frame (25), from the back to Arranged in front order, the 45-degree reflector (24) is fixed directly behind the mirror frame (25); the precision motor (21) is placed directly below the mirror frame (25), and the precision motor (21) passes through the output shaft (22) ) is vertically connected to the lower part of the mirror frame (25); the motor controller (23) is placed on the right side of the precision motor (21) and is connected to the precision motor (21) via a special cable. The motor controller (23) is provided with a motor control Input port (t); the front and rear centers of the surface focusing sheet light body optic (19), the 45-degree reflector (24) and the frame (25) are on the same front and rear horizontal center line (26); by the 45-degree reflector The laser beam II (17), laser beam III (18) and laser beam IV (20) reflected by 24 are arranged in sequence from left to right.