CN108918505B - Polarized gas Raman spectrum measurement system - Google Patents
Polarized gas Raman spectrum measurement system Download PDFInfo
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- CN108918505B CN108918505B CN201811092082.1A CN201811092082A CN108918505B CN 108918505 B CN108918505 B CN 108918505B CN 201811092082 A CN201811092082 A CN 201811092082A CN 108918505 B CN108918505 B CN 108918505B
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
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- 238000005516 engineering process Methods 0.000 abstract description 9
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Classifications
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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
Abstract
The invention relates to a polarized gas Raman spectrum measurement system, belonging to the technical field of laser combustion diagnosis, wherein a polarization generation system, a horizontal polarization Raman system and a vertical polarization Raman system are arranged front and back, a laser system is arranged at the left side of the horizontal polarization Raman system, a polarization decomposition system is arranged at the right side of the horizontal polarization Raman system, and a measurement and control system is arranged at the right side of the vertical polarization Raman system; the combustion zone is positioned between the polarization generating system and the laser collector; the horizontal center line II and the horizontal center line I vertically intersect at the center of the 45-degree reflecting mirror; the horizontal center line II and the horizontal center line IV are perpendicularly intersected with the center of the combustion zone; the horizontal center line III and the horizontal center line IV are perpendicular to the center of the polarized light beam splitting prism. According to the invention, through the original laser polarization characteristic processing technology and the two polarization scattered light decomposition and synchronous receiving and subtracting technologies, fluorescence interference is removed, the gas Raman scattering signal is maximized, and the high-precision quantitative detection of the mole fraction and the temperature of the gas species in the combustion field is realized.
Description
Technical Field
The invention belongs to the technical field of laser combustion diagnosis, and particularly relates to a polarized gas Raman 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, the influence of the polarization characteristic of the gas on the gas raman spectrum measurement result is not considered in many applications, so that the laser-induced gas fluorescence seriously interferes with the very weak gas raman signal, which makes quantitative measurement very difficult, and particularly, the gas raman spectrum signal is not basically measured when the excitation light source is in the ultraviolet region. Even though this measurement technique takes into account the effects of gas polarization properties in various applications, no accurate quantitative measurement of gas raman spectra has been accomplished from a simultaneous combination of both the original laser polarization state processing technique and the polarized scattered light receiving technique.
Disclosure of Invention
The invention aims to provide a technology for accurately and quantitatively measuring gas mole fraction by combining a polarization state transformation technology and a polarized scattered light decomposition and spectrum receiving technology by using original laser. The original laser is changed into two excitation light sources with vertical polarization (p polarization) and horizontal polarization (s polarization) through a zero-order 1/2 wave plate and a Wollaston prism, scattered light with the two polarization states is formed after each gaseous species to be detected in a combustion field is excited by the two laser, the scattered light with the two polarization directions is separated by a polarized light beam splitter prism and synchronously received by two sets of Raman spectrum imaging systems which are arranged in the same way, and finally the Raman spectrum signals with the vertical polarization are subtracted by the Raman spectrum signals with the horizontal polarization to obtain the Raman spectrum signals with the maximized gaseous species without fluorescence interference, so that the spectrum detection of the mole fraction of mixed gas and the regional temperature in the combustion field environment is realized.
The invention comprises a polarization generating system I, a laser system II, a horizontal polarization Raman system III, a polarization decomposition system IV, a vertical polarization Raman system V, a measurement and control system VI, a combustion zone 1 and a laser collector 2, wherein the polarization generating system I, the laser system II, the horizontal polarization Raman system III, the polarization decomposition system IV, the vertical polarization Raman system V, the measurement and control system VI, the combustion zone 1 and the laser collector 2 are arranged on an optical platform on the same horizontal plane; the polarization generation system I, the horizontal polarization Raman system III and the vertical polarization Raman system V are arranged from front to back, the laser system II is arranged on the left side of the horizontal polarization Raman system III, the polarization decomposition system IV is arranged on the right side of the horizontal polarization Raman system III, and the measurement and control system VI is arranged on the right side of the vertical polarization Raman system V; the combustion zone 1 is positioned right of the polarization generating system I and right of the laser collector 2; the horizontal center line II 9 of the polarization generation system I and the horizontal center line I4 of the laser system II are perpendicularly intersected at the center of the 45-degree reflecting mirror 3 in the polarization generation system I; the horizontal center line II 9 of the polarization generation system I and the horizontal center line IV 27 of the polarization decomposition system IV are vertically intersected at the center of the combustion zone 1; the horizontal center line of the vertical polarization Raman system V and the horizontal center line of the polarization decomposition system IV are horizontal center lines IV 27; the horizontal center line III 26 of the horizontal polarization Raman system III and the horizontal center line IV 27 vertically intersect at the center of the polarization beam splitting prism 31 in the polarization splitting system IV.
The external trigger output port c of the raman ICCD camera i 20 in the horizontal s-polarization raman system iii is connected to the Q-switched external trigger input port b of the laser controller 19 in the laser system ii via a dedicated cable.
The data output port ie of the raman ICCD camera i 20 in the horizontal s-polarization raman system iii is connected with the data input port ii of the industrial personal computer 41 in the measurement and control system vi via a dedicated cable.
The data output port II g of the Raman ICCD camera II 33 in the vertical p-polarization Raman system V is connected with the data input port ih of the industrial personal computer 41 in the measurement and control system VI through a special cable.
The pulse output port ij of the digital delay pulse generator 42 in the measurement and control system VI is connected with the external trigger input port II f of the Raman ICCD camera II 33 in the vertical p-polarization Raman system V through a special cable.
The pulse output port IIk of the digital delay pulse generator 42 in the measurement and control system VI is connected with the external trigger input port Id of the Raman ICCD camera I20 in the horizontal s-polarization Raman system III through a special cable.
The sum pulse output port III of the digital delay pulse generator 42 in the measurement and control system VI is connected with the external trigger input port a of the pump lamp of the laser controller 19 in the laser system II through a special cable.
The polarization generation system I consists of a 45-degree reflecting mirror 3, a zero-order wave plate 5, a Wollaston prism 6 and a focusing mirror 8, wherein the 45-degree reflecting mirror 3, the zero-order wave plate 5, the Wollaston prism 6 and the focusing mirror 8 are arranged from left to right, and the central lines of the 45-degree reflecting mirror 3, the zero-order wave plate 5, the Wollaston prism 6 and the focusing mirror 8 are overlapped with a horizontal central line II 9; the coating working surface of the 45-degree reflecting mirror 3 faces to the right and the lower.
The laser system II consists of a laser pulse stretcher 17, a laser 18 and a laser controller 19, wherein the laser controller 19 is provided with a pumping lamp external trigger input port a and a Q switch external trigger input port b; the laser controller 19, the laser 18 and the laser pulse stretcher 17 are arranged from back to front, the central connecting line of the laser outlet of the laser pulse stretcher 17 and the laser outlet of the laser 18 is a horizontal central line I4, and the laser controller 19 is connected with the laser 18 through a special cable 15 for the laser.
The horizontal polarization Raman system III consists of a Raman ICCD camera I20, an adapter I21, a spectrometer I22 and an s-polarized light collector 24, wherein an external trigger output port c, an external trigger input port id and a data output port ie are arranged on the Raman ICCD camera I20; the s-polarized light collector 24, the spectrometer I22, the adapter I21 and the Raman ICCD camera I20 are arranged from right to left, and the Raman ICCD camera I20 is fixedly connected with a spectrum outlet of the spectrometer I22 through the adapter I21; the center line of the entrance slit of spectrometer I22 and s-polarized light collector 24 is horizontal center line III 26.
The polarization decomposition system IV consists of a scattered light collecting mirror 29 and a polarized light beam splitting prism 31, wherein the scattered light collecting mirror 29 and the polarized light beam splitting prism 31 are arranged front and back, and the central connecting line of the scattered light collecting mirror 29 and the polarized light beam splitting prism 31 is a horizontal central line IV 27.
The vertical polarization Raman system V consists of a Raman ICCD camera II 33, a p-polarized light collector 35, a spectrometer II 36 and an adapter II 37, wherein an external trigger input port IIf and a data output port IIg are arranged on the Raman ICCD camera II 33; the Raman ICCD camera II 33 and the spectrometer II 36 are arranged left and right, and the Raman ICCD camera II 33 is fixedly connected with a spectrum outlet of the spectrometer II 36 through an adapter II 37; the p-polarized light collector 35 is placed in front of the spectrometer II 36, and the center line of the entrance slit in the p-polarized light collector 35 and the spectrometer II 36 is the horizontal center line I4.
The measurement and control system VI consists of a display 40, an industrial personal computer 41 and a digital delay pulse generator 42, wherein the industrial personal computer 41 is provided with a Raman ICCD camera acquisition card I38 and a Raman ICCD camera acquisition card II 39; a data input port ih is arranged on the acquisition card I38 of the Raman ICCD camera, and a data input port ii is arranged on the acquisition card II 39 of the Raman ICCD camera; the digital delay pulse generator 42 is provided with a pulse output port ij, a pulse output port ii k and a pulse output port il; the display 40 is arranged on the industrial personal computer 41, and the digital delay pulse generator 42 is arranged on the right side of the industrial personal computer 41.
According to the invention, through the original laser polarization characteristic processing technology and the two polarization scattered light decomposition and synchronous receiving and subtracting technologies, fluorescence interference is removed, the gas Raman scattering signal is maximized, and the high-precision quantitative detection of the mole fraction and the temperature of the gas species in the combustion field is realized.
Drawings
FIG. 1 is a schematic diagram of a polarized gas Raman spectroscopy system
FIG. 2 is a schematic diagram of a polarization generating system I
FIG. 3 is a schematic diagram of a laser system II
FIG. 4 is a schematic diagram of a horizontally polarized Raman system III
FIG. 5 is a schematic diagram of a polarization decomposition system IV
Fig. 6 is a schematic structural diagram of a vertical polarization raman system v
FIG. 7 is a schematic diagram of the structure of the measurement and control system VI
FIG. 8 is a timing diagram of signal synchronization
Wherein: a polarization generating system II, a laser system III, a horizontal polarization Raman system IV, a polarization decomposing system V, a vertical polarization Raman system VI, a measurement and control system 1, a combustion zone 2, a laser collector 3.45 degree mirror 4, a horizontal center line I5, a zero-order wave plate 6, a Wollaston prism 7.p polarization laser beam 8, a focusing mirror 9, a horizontal center line II 10, a composite focused laser beam 11.S polarization laser beam 12.P polarization and S polarization composite laser beam 13, a broadened laser beam I14, a broadened laser beam II 15, a laser dedicated cable 16, a raw laser beam 17, a laser pulse stretcher 18, a laser 19, a laser controller 20, a Raman ICCD camera I21, an adapter I22, a spectrometer I23.S polarization Raman light and fluorescent composite scattered light 24.S polarization collector 25.S polarization Raman light, fluorescent and laser composite scattered light 26, a horizontal center line III 27, a horizontal center line IV 28, a scattered light collector 30, a scattered light II 31, a polarized light beam splitter prism 32.P polarization Raman light Fluorescent and laser composite scattered light 33 Raman ICCD camera II 34.P polarized Raman light and fluorescent composite scattered light 35.P polarized light collector 36 spectrometer II 37 adapter II 38 Raman ICCD camera acquisition card I39 Raman ICCD camera acquisition card II 40 display 41 industrial personal computer 42 digital delay pulse generator a pump lamp external trigger input port b.Q switch external trigger input port c external trigger output port d external trigger input port ie data output port if external trigger input port II g data output port II h data input port II i data input port II j pulse output port Ik pulse output port II I III
Detailed Description
The invention is described below with reference to the accompanying drawings:
the invention comprises a polarization generating system I, a laser system II, a horizontal polarization Raman system III, a polarization decomposition system IV, a vertical polarization Raman system V, a measurement and control system VI, a combustion zone 1 and a laser collector 2, wherein the polarization generating system I, the laser system II, the horizontal polarization Raman system III, the polarization decomposition system IV, the vertical polarization Raman system V, the measurement and control system VI, the combustion zone 1 and the laser collector 2 are arranged on an optical platform on the same horizontal plane; the polarization generation system I, the horizontal polarization Raman system III and the vertical polarization Raman system V are arranged from front to back, the laser system II is arranged on the left side of the horizontal polarization Raman system III, the polarization decomposition system IV is arranged on the right side of the horizontal polarization Raman system III, and the measurement and control system VI is arranged on the right side of the vertical polarization Raman system V; the combustion zone 1 is positioned right of the polarization generating system I and right of the laser collector 2; the horizontal center line II 9 of the polarization generation system I and the horizontal center line I4 of the laser system II are perpendicularly intersected at the center of the 45-degree reflecting mirror 3 in the polarization generation system I; the horizontal center line II 9 of the polarization generation system I and the horizontal center line IV 27 of the polarization decomposition system IV are vertically intersected at the center of the combustion zone 1; the horizontal center line of the vertical polarization Raman system V and the horizontal center line of the polarization decomposition system IV are horizontal center lines IV 27; the horizontal center line III 26 of the horizontal polarization Raman system III and the horizontal center line IV 27 vertically intersect at the center of the polarization beam splitting prism 31 in the polarization splitting system IV.
The external trigger output port c of the raman ICCD camera i 20 in the horizontal s-polarization raman system iii is connected to the Q-switched external trigger input port b of the laser controller 19 in the laser system ii via a dedicated cable.
The data output port ie of the raman ICCD camera i 20 in the horizontal s-polarization raman system iii is connected with the data input port ii of the industrial personal computer 41 in the measurement and control system vi via a dedicated cable.
The data output port II g of the Raman ICCD camera II 33 in the vertical p-polarization Raman system V is connected with the data input port ih of the industrial personal computer 41 in the measurement and control system VI through a special cable.
The pulse output port ij of the digital delay pulse generator 42 in the measurement and control system VI is connected with the external trigger input port II f of the Raman ICCD camera II 33 in the vertical p-polarization Raman system V through a special cable.
The pulse output port IIk of the digital delay pulse generator 42 in the measurement and control system VI is connected with the external trigger input port Id of the Raman ICCD camera I20 in the horizontal s-polarization Raman system III through a special cable.
The sum pulse output port III of the digital delay pulse generator 42 in the measurement and control system VI is connected with the external trigger input port a of the pump lamp of the laser controller 19 in the laser system II through a special cable.
As shown in fig. 2, the polarization generating system i is composed of a 45-degree reflecting mirror 3, a zero-order wave plate 5, a wollaston prism 6 and a focusing mirror 8, wherein the 45-degree reflecting mirror 3, the zero-order wave plate 5, the wollaston prism 6 and the focusing mirror 8 are arranged from left to right, and the central lines of the 45-degree reflecting mirror 3, the zero-order wave plate 5, the wollaston prism 6 and the focusing mirror 8 coincide with a horizontal central line ii 9; the coating working surface of the 45-degree reflecting mirror 3 faces to the right and the lower.
As shown in fig. 3, the laser system ii is composed of a laser pulse stretcher 17, a laser 18 and a laser controller 19, wherein the laser controller 19 is provided with a pump lamp external trigger input port a and a Q switch external trigger input port b; the laser controller 19, the laser 18 and the laser pulse stretcher 17 are arranged from back to front, the central connecting line of the laser outlet of the laser pulse stretcher 17 and the laser outlet of the laser 18 is a horizontal central line I4, and the laser controller 19 is connected with the laser 18 through a special cable 15 for the laser.
As shown in fig. 4, the horizontal polarization raman system iii is composed of a raman ICCD camera i 20, an adapter i 21, a spectrometer i 22, and an s-polarized light collector 24, where the raman ICCD camera i 20 is provided with an external trigger output port c, an external trigger input port id, and a data output port ie; the s-polarized light collector 24, the spectrometer I22, the adapter I21 and the Raman ICCD camera I20 are arranged from right to left, and the Raman ICCD camera I20 is fixedly connected with a spectrum outlet of the spectrometer I22 through the adapter I21; the center line of the entrance slit of spectrometer I22 and s-polarized light collector 24 is horizontal center line III 26.
As shown in fig. 5, the polarization splitting system iv is composed of a scattered light collecting mirror 29 and a polarization beam splitter prism 31, the scattered light collecting mirror 29 and the polarization beam splitter prism 31 are arranged in front of each other, and the central line between the scattered light collecting mirror 29 and the polarization beam splitter prism 31 is a horizontal central line iv 27.
As shown in fig. 6, the vertical polarization raman system v is composed of a raman ICCD camera ii 33, a p-polarized light collector 35, a spectrometer ii 36, and an adapter ii 37, where the raman ICCD camera ii 33 is provided with an external trigger input port ii f and a data output port ii g; the Raman ICCD camera II 33 and the spectrometer II 36 are arranged left and right, and the Raman ICCD camera II 33 is fixedly connected with a spectrum outlet of the spectrometer II 36 through an adapter II 37; the p-polarized light collector 35 is placed in front of the spectrometer II 36, and the center line of the entrance slit in the p-polarized light collector 35 and the spectrometer II 36 is the horizontal center line I4.
As shown in fig. 7, the measurement and control system vi is composed of a display 40, an industrial personal computer 41 and a digital delay pulse generator 42, wherein the industrial personal computer 41 is provided with a raman ICCD camera acquisition card i 38 and a raman ICCD camera acquisition card ii 39; a data input port ih is arranged on the acquisition card I38 of the Raman ICCD camera, and a data input port ii is arranged on the acquisition card II 39 of the Raman ICCD camera; the digital delay pulse generator 42 is provided with a pulse output port ij, a pulse output port ii k and a pulse output port il; the display 40 is arranged on the industrial personal computer 41, and the digital delay pulse generator 42 is arranged on the right side of the industrial personal computer 41.
The specific connection process and requirements of the invention are as follows:
preliminarily adjusting the central height of each optical device: the centers of the combustion zone 1, the laser collector 2, the 45-degree reflecting mirror 3, the zero-order wave plate 5, the Wollaston prism 6, the focusing mirror 8, the laser pulse stretcher 17, the laser 18, the Raman ICCD camera I20, the spectrometer I22, the s-polarized light collector 24, the scattered light collecting mirror 29, the polarized light splitting prism 31, the Raman ICCD camera II 22, the p-polarized light collector 35 and the spectrometer II 36 are in the same horizontal plane by adjusting the positions of all the knobs of the mirror holder instrument base; the horizontal center line II 9 and the horizontal center line I4 are vertically intersected with the right center of the 45-degree reflecting mirror 3 in the same horizontal plane by adjustment, and are vertically intersected with the right center of the combustion zone 1 in the same horizontal plane with the horizontal center line IV 27; so that the horizontal center line ii 9 and the horizontal center line iii 26 intersect perpendicularly in the same horizontal plane at the center of the polarization beam splitter prism 31.
All instruments and equipment are electrified and preheated, the positions of the instrument knobs are set, the measurement parameters of the instruments are input, and the main control program on the industrial personal computer 41 is entered.
Accurately adjusting the central multidimensional position of each optical device: the laser emitter 18 emits a low-energy 532nm (nanometer) visible light original laser beam 16 for debugging, and the laser light in the space at the very center point of the combustion zone 1 is synchronously measured through the real-time imaging functional modes of the Raman ICCD camera I20 and the Raman ICCD camera II 33. Fine tuning the height, side-to-side and front-to-back positions, tilt angles and tilt angles of all equipment and frames ensures that the two real images displayed on display 40, as received by raman ICCD camera acquisition card i 38 and raman ICCD camera ii 39, respectively, coincide and are either vertical or horizontal on the screen of display 40.
Measuring laser spontaneous vibration Raman scattering spectrum of gaseous species at high temperature and high pressure: the combustion zone 1 is adjusted to the pressure, temperature and component concentration to be measured; setting the laser 18, the raman ICCD camera i 20 and the raman ICCD camera ii 33 to a measurement function mode; controlling the laser 18 to emit an original laser beam 16 of a certain experimental energy mJ (millijoule); according to the signal synchronization sequence shown in fig. 8, the measurement of the raman spectrum of each species at the focal point of the P-polarized and s-polarized composite focused laser beam 10 on the combustion zone 1 is completed by the main program in the industrial personal computer 41, and the mole fraction and the region temperature value of each species under such experimental conditions are finally calculated through the subtraction operation of the two spectra in the main program.
Examples:
as shown in fig. 1, a LS2137 type laser 18, a PS2225 type laser controller 19 and an independently developed laser pulse stretcher 17 of the company LOTIS TII in white russia are selected in a laser system ii, the laser 18 emits a 532nm (nanometer) original laser beam 16, the diameter of an exit spot of the original laser beam is about 8mm (millimeter), the width half maximum (FWHM) of the pulse width is about 7ns (nanosecond), the frequency is 10Hz, the experimental output laser energy is 380 millijoules, and the peak power is 0.4GW; the laser pulse stretcher 17 outputs a stretched laser beam II 14 and a stretched laser beam I13, which have FWHM of about 35ns, a spot diameter of 6mm, a frequency of 10Hz, an energy of 350mJ, and a peak power of 0.02GW. The widened laser beam I13 firstly passes through a linear polarization 1/2 zero-order wave plate 5 which is rotated by an angle of 45 degrees, forms a p-polarized and s-polarized composite laser beam 12, and then is divided into an upper laser beam and a lower laser beam, namely a p-polarized laser beam 7 and an s-polarized laser beam 11 by a WPQ10 Wollaston prism 6 of THORLABS company of America; the two laser beams are synthesized into a p-polarized and s-polarized composite focusing laser beam 10 through a focusing mirror 8 with the focal length of 500mm, and focused on a focusing point space region in the combustion zone 1 to excite gaseous species in the region, and Raman scattered light, fluorescence, laser scattered light and the like are mainly generated; the self-made laser collector 2 collects the elastic scattered laser after excitation is completed; the scattered light collecting mirror 29 with the diameter of 70mm collects scattered light I28 in a certain collection solid angle on the focus space area according to the direction of 90 degrees with the P polarization and s polarization composite focusing laser beam 10 to form scattered light II 30; the scattered light II 30 is decomposed into s-polarized Raman light, fluorescence and laser composite scattered light 25 and p-polarized Raman light, fluorescence and laser composite scattered light 32 through VA5-532 polarized light beam splitting prism 31 of THORLABS, the s-polarized Raman light and fluorescence composite scattered light 23 and the p-polarized Raman light and fluorescence composite scattered light 34 which are formed by filtering out the laser scattered light after the independently developed s-polarized light collector 24 and p-polarized collector 35 respectively; the spectrums of the s-polarized Raman light and the fluorescence composite scattered light 23 and the p-polarized Raman light and the fluorescence composite scattered light 34 are respectively obtained by the spectrometer I22, the Raman ICCDI 20, the spectrometer II 36 and the Raman ICCDII 33; the data processing is performed by a program in the industrial personal computer 41, and raman scattering spectrum data of the gas species obtained by subtracting the s-polarized raman light and the fluorescence composite scattered light 23 from the p-polarized raman light and the fluorescence composite scattered light 34 is obtained.
The negative narrow-band laser wavelength filters selected in the s-polarized light collector 24 and the p-polarized light collector 35 are NF01-532U-25 type Notch filters of Semrock company to prevent 532nm wavelength laser from scattering light; the spectrometer I20 and the spectrometer II 36 are Superpectrum 500is/sm imaging grating spectrometers of BRUKER company in U.S.A., 600g/mm grating is selected, the slit width is set to be 350 μm, and the outlets of the two gratings are respectively provided with a Raman ICCD camera 20 and a Raman ICCD camera 33 of DH720-18F-03 enhanced CCD of Andor company in U.K.; digital delay pulse generator 42 is DG645 pulse delay generator from STANFORD corporation of usa; two Raman ICCD camera acquisition cards I and two Raman ICCD camera acquisition cards II are respectively inserted into an Intel main board in the Taiwan Yanghua 610H-type industrial personal computer 41.
As shown in fig. 8, wherein: a is the output signal waveform of the pulse output port Ij, the pulse output port IIk and the pulse output port IIIl; b is the waveform of the output signal of the external trigger output port c; c is the time domain waveform of the original laser beam 16; d is the internal department control waveforms of the Raman ICCD camera I20 and the Raman ICCD camera II 33; f is the time domain waveform of the p-polarized Raman spectrum signal; g is the s-polarized raman signal time domain waveform. Setting A1 to 0.1s; A. the frequencies of B, C, D, E, F and G curves are 10Hz; b1 is 140 μm; d1 is 140.14ns seconds; d2 is 40ns.
Claims (7)
1. A polarized gas raman spectroscopy system, characterized by: the system consists of a polarization generation system (I), a laser system (II), a horizontal polarization Raman system (III), a polarization decomposition system (IV), a vertical polarization Raman system (V), a measurement and control system (VI), a combustion zone (1) and a laser collector (2), wherein the polarization generation system (I), the laser system (II), the horizontal polarization Raman system (III), the polarization decomposition system (IV), the vertical polarization Raman system (V), the measurement and control system (VI), the combustion zone (1) and the laser collector (2) are arranged on an optical platform on the same horizontal plane; the polarization generation system (I), the horizontal polarization Raman system (III) and the vertical polarization Raman system (V) are arranged from front to back, the laser system (II) is arranged on the left side of the horizontal polarization Raman system (III), the polarization decomposition system (IV) is arranged on the right side of the horizontal polarization Raman system (III), and the measurement and control system (VI) is arranged on the right side of the vertical polarization Raman system (V); the combustion area (1) is positioned right of the polarization generating system (I) and right left of the laser collector (2); the horizontal center line II (9) of the polarization generation system (I) and the horizontal center line I (4) of the laser system (II) are perpendicularly intersected at the center of the 45-degree reflecting mirror (3) in the polarization generation system (I); the horizontal center line II (9) of the polarization generating system (I) and the horizontal center line IV (27) of the polarization decomposing system (IV) are vertically intersected at the center of the combustion zone (1); the horizontal center line of the vertical polarization Raman system (V) and the horizontal center line of the polarization decomposition system (IV) are both horizontal center lines IV (27); a horizontal center line III (26) of the horizontal polarization Raman system (III) and a horizontal center line IV (27) are perpendicularly intersected at the center of a polarized light beam splitting prism (31) in the polarization decomposition system (IV); the external trigger output port (c) of the Raman ICCD camera I (20) in the horizontal(s) polarization Raman system (III) is connected with the Q-switch external trigger input port (b) of the laser controller (19) in the laser system (II) through a special cable; the data output port I (e) of the Raman ICCD camera I (20) in the horizontal(s) polarization Raman system (III) is connected with the data input port II (i) of the industrial personal computer (41) in the measurement and control system (VI) through a special cable; the data output port II (g) of the Raman ICCD camera II (33) in the vertical (p) polarization Raman system (V) is connected with the data input port I (h) of the industrial personal computer (41) in the measurement and control system (VI) through a special cable; the pulse output port I (j) of the digital delay pulse generator (42) in the measurement and control system (VI) is connected with the external trigger input port II (f) of the Raman ICCD camera II (33) in the vertical (p) polarization Raman system (V) through a special cable; the pulse output port II (k) of the digital delay pulse generator (42) in the measurement and control system (VI) is connected with the external trigger input port I (d) of the Raman ICCD camera I (20) in the horizontal(s) polarization Raman system (III) through a special cable; the digital delay pulse generator (42) and the pulse output port III (l) of the measurement and control system (VI) are connected with the external trigger input port (a) of the pumping lamp of the laser controller (19) in the laser system (II) through special cables.
2. The polarized gas raman spectroscopy system according to claim 1 wherein: the polarization generation system (I) consists of a 45-degree reflecting mirror (3), a zero-order wave plate (5), a Wollaston prism (6) and a focusing mirror (8), wherein the 45-degree reflecting mirror (3), the zero-order wave plate (5), the Wollaston prism (6) and the focusing mirror (8) are arranged from left to right, and the central lines of the 45-degree reflecting mirror (3), the zero-order wave plate (5), the Wollaston prism (6) and the focusing mirror (8) coincide with a horizontal central line II (9); the coating working surface of the 45-degree reflector (3) faces to the right lower part.
3. The polarized gas raman spectroscopy system according to claim 1 wherein: the laser system (II) consists of a laser pulse stretcher (17), a laser (18) and a laser controller (19), wherein the laser controller (19) is provided with a pumping lamp external trigger input port (a) and a Q switch external trigger input port (b); the laser controller (19), the laser (18) and the laser pulse stretcher (17) are arranged from back to front, the central connecting line of the laser outlet of the laser pulse stretcher (17) and the laser outlet of the laser (18) is a horizontal central line I (4), and the laser controller (19) is connected with the laser (18) through a special cable (15) of the laser.
4. The polarized gas raman spectroscopy system according to claim 1 wherein: the horizontal polarization Raman system (III) consists of a Raman ICCD camera I (20), an adapter I (21), a spectrometer I (22) and an s-polarized light collector (24), wherein an external trigger output port (c), an external trigger input port I (d) and a data output port I (e) are arranged on the Raman ICCD camera I (20); the s-polarized light collector (24), the spectrometer I (22), the adapter I (21) and the Raman ICCD camera I (20) are arranged from right to left, and the Raman ICCD camera I (20) is fixedly connected with a spectrum outlet of the spectrometer I22 through the adapter I (21); the center line of the entrance slit of the spectrometer I (22) and the s-polarized light collector (24) is a horizontal center line III (26).
5. The polarized gas raman spectroscopy system according to claim 1 wherein: the polarization decomposition system (IV) is composed of a scattered light collecting mirror (29) and a polarized light beam splitting prism (31), wherein the scattered light collecting mirror (29) and the polarized light beam splitting prism (31) are arranged front and back, and the central connecting line of the scattered light collecting mirror (29) and the polarized light beam splitting prism (31) is a horizontal central line IV (27).
6. The polarized gas raman spectroscopy system according to claim 1 wherein: the vertical polarization Raman system (V) consists of a Raman ICCD camera II (33), a p-polarized light collector (35), a spectrometer II (36) and an adapter II (37), wherein an external trigger input port II (f) and a data output port II (g) are arranged on the Raman ICCD camera II (33); the Raman ICCD camera II (33) and the spectrometer II (36) are arranged left and right, and the Raman ICCD camera II (33) is fixedly connected with a spectrum outlet of the spectrometer II (36) through the adapter II (37); the p-polarized light collector (35) is arranged in front of the spectrometer II (36), and the central line of the p-polarized light collector (35) and the entrance slit in the spectrometer II (36) is a horizontal central line I (4).
7. The polarized gas raman spectroscopy system according to claim 1 wherein: the measurement and control system (VI) consists of a display (40), an industrial personal computer (41) and a digital delay pulse generator (42), wherein a Raman ICCD camera acquisition card I (38) and a Raman ICCD camera acquisition card II (39) are arranged on the industrial personal computer (41); a data input port I (h) is arranged on a Raman ICCD camera acquisition card I (38), and a data input port II (i) is arranged on a Raman ICCD camera acquisition card II (39); the digital delay pulse generator (42) is provided with a pulse output port I (j), a pulse output port II (k) and a pulse output port III (l); the display (40) is arranged on the industrial personal computer (41), and the digital delay pulse generator (42) is arranged on the right of the industrial personal computer (41).
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| CN108507627A (en) * | 2018-06-27 | 2018-09-07 | 吉林大学 | The spectral detection system of gaseous species concentration and temperature under a kind of high temperature and pressure |
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| CN108507627A (en) * | 2018-06-27 | 2018-09-07 | 吉林大学 | The spectral detection system of gaseous species concentration and temperature under a kind of high temperature and pressure |
| CN208833667U (en) * | 2018-09-19 | 2019-05-07 | 吉林大学 | A kind of polarization type gas Raman spectral measurement system |
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