High-frequency double-color coherent anti-Stokes Raman spectrum temperature measuring device and method

Abstract

The invention relates to a high-frequency double-color coherent anti-Stokes Raman spectrum temperature measurement device and method, and the device comprises a high-frequency laser which is used forgenerating 1064nm laser with the repetition frequency of 100kHz and outputting 355nm laser and 532nm laser after the 1064nm laser is subjected to triple frequency and double frequency, wherein the 532nm laser serves as pump light / probe light; a seed laser module which is used for generating two seed lasers near 855nm; an optical parametric oscillator which is used for converting the 355nm laser input by the high-frequency laser and the 855nm laser input by the seed laser to generate 607nm laser as Stokes light; a coherent anti-Stokes Raman signal generation module which is used for mixing 532nm pump light and Stokes laser near 607nm at a detection gas molecule through a lens to generate a coherent anti-Stokes Raman signal; and an imaging spectrometer which is used for imaging the input coherent anti-Stokes Raman signal and calculating the spectral data of the image to obtain the temperature of the detection gas.

Description

Technical field[0001]The invention belongs to the field of photoelectric temperature measurement, and particularly relates to a high-frequency two-color coherent anti-Stokes Raman spectroscopy temperature measurement device and method.Background technique[0002]Combustion diagnosis refers to the experimental measurement of the combustion process and the analysis of the results to obtain relevant information about the fuel, combustion products, and combustion flow field. The diagnosis of combustion flow field involves a wide range of knowledge, such as physical optics, physical chemistry, statistical thermodynamics, laser spectroscopy, instrument analysis, and data processing. The measured objects include the velocity, temperature, density of the flow field, etc. Parameters, and the flow field itself has the characteristics of high temperature flame radiation and gas condensation two-phase complex flow, which puts forward high requirements on diagnostic measurement technology. For a l...

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Problems solved by technology

This hybrid femtosecond / picosecond coherent anti-Stokes Raman spectroscopy method uses a high repetition rate laser to generate laser light, and the temporal resolution and spatial resolution have also been improved, but at least two lasers must be used simultaneously to generate Femtosecond and picosecond lasers, the system structure is complex, and the laser is broadband, to measure the continuous rotation vibration Raman spectrum of the target gas, the non-resonant background interference generated is strong, and the efficiency is low

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