Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging
A technology of optical diagnosis and scattered rays, applied in Raman scattering, material excitation analysis, material analysis through optical means, etc., can solve problems such as gas cracking, damage to optical components and quartz sealing windows, etc., to avoid gas cracking, improve Weak Raman scattering signal-to-noise ratio and the effect of improving Raman scattering signal-to-noise ratio
Inactive Publication Date: 2013-09-11
JILIN UNIV
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Problems solved by technology
But too high a pulsed laser can cause gas cracking on the focused area, damage to optical components and quartz sealing windows in the path of the laser beam, and direct ignition of flammable gas to be tested
[0004] At present, there is no optical diagnostic system that can solve the above two problems
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[0021] figure 1 The structure of the SRS optical diagnostic system using laser-induced gas is shown.
[0022] The laser 1 used in the SRS light source is a LS-2137U Q-switched flash lamp-pumped Nd:YAG laser from Belarus LOTIS LII Company. A pulsed laser output with a wavelength of 532nm (nanometer) and a frequency of 10Hz (hertz) is selected. When the energy of the pump lamp is 40J (joule), the laser outputs a stable energy of 400mj (millijoule), the peak power is about 0.4GW (gigawatt), and the full width at half maximum intensity (FWHM) is 6.5ns (nanosecond) sharp pulse laser, the beam divergence angle is less than 1mrad (milliradian), and the spot diameter is 8mm (millimeter).
[0023] The laser beam expander A used is as figure 2 As shown, an 8mm diameter beam can be expanded to 16mm.
[0024] The laser pulse stretcher B used has two optical ring cavities such as image 3 As shown, the reflectivity of beam splitter II 21 incident at a 45° angle is 48%, and the reflec...
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Abstract
The invention relates to an optical diagnostic system on the basis of laser spontaneous Raman scattered ray imaging, belonging to the technical field of laser spectrum testing. According to the invention, a laser pulse shaper is arranged between a laser and a gas sample tank; a cutoff device is arranged at one end of a laser emergence quartz window of the gas sample tank; a total reflective mirror is arranged between an outlet of a scattered ray output quartz window of the gas sample tank and a line light source collector at an angle of 45 degrees; an optical filter is arranged between the line light source collector and an inlet of a spectrometer; an outlet of the spectrometer is respectively connected with an ICCD (Intensified Charge Coupled Device) and an inlet of a measurement and control machine; the ICCD is also respectively connected with the laser and the measurement and control machine; and due to the adoption of the optical diagnostic system, the phenomena of gas fracturing, damage to optical elements and the quartz windows, ignition of inflammable gases and the like can be effectively avoided, the weak Raman scattering signal to noise ratio can be effectively improved, and a multichannel gas Raman spectrum experiment proves that the optical diagnostic system can be applied to synchronous quantitative measurement in a plurality of regions of the gas mixture concentration in an optical engine.
Description
technical field [0001] The invention belongs to the technical field of laser spectrum testing, and in particular relates to the quantitative measurement of gas concentration by using laser spontaneous Raman scattering imaging. Background technique [0002] Spontaneous Raman Scattering (SRS) can simultaneously and quantitatively measure the main substances in various combustion fields (such as engines, burners and flames, etc.), such as N 2 , O 2 、H 2 O.CO 2 and the concentration information of gases such as hydrocarbons. Since this laser-based combustion diagnosis technology has the characteristics of non-contact and time-space resolution, it has been widely used in the research of combustion processes in various complex environments. But at present, both at home and abroad, the laser beam is firstly focused with a focusing lens to form a beam waist (about 1mm long), and it is placed on the area to be detected, and then the Raman scattered light on the beam waist is coll...
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IPC IPC(8): G01N21/65G01N21/01
Inventor 程鹏李晓冰王伟东蒋俊光李华王有坤郭英男高印寒任锐
Owner JILIN UNIV