CARS (coherent anti-stokes Raman scattering) and TDLAS (tunable diode laser absorption spectroscopy) collinear temperature measurement device

Abstract

The invention discloses a CARS (coherent anti-stokes Raman scattering) and TDLAS (tunable diode laser absorption spectroscopy) collinear temperature measurement device which comprises a CARS unit, a TDLAS unit, an input dichroic mirror, a spatial filter and an output dichroic mirror. According to the device, the input dichroic mirror and the output dichroic mirror are used for combining and splitting TDLAS-technology-based laser omega(LD) and CARS-technology-based stokes light omega(s), and a beam shaping mirror and the spatial filter are used for combining and splitting CARS-technology-based pump light omega(p) and the CARS-technology-based stokes light omega(s), so that a transmitter and a receiver are shared by two measurement units, the complexity of measurement systems is lowered, and a TDLAS-technology-based filter and a TDLAS-technology-based detector are prevented from being damaged by omega(p) and omega(s) with high power; different time resolution and measurement accuracy parameters are provided for the parameter analysis in a temperature field, and meanwhile, data comparison verification between the two measurement systems is facilitated.

Description

technical field [0001] The invention relates to a laser comprehensive diagnosis system for flow field parameters, in particular to a combined diagnosis system utilizing CARS technology and TDLAS technology. Background technique [0002] CARS (Coherent Anti-Stokes Raman Scattering) technology, that is, coherent anti-Stokes Raman scattering technology. It is a third-order nonlinear laser spectroscopy technique, that is, the pump light ω p and Stokes light ω s Focus on the detection area in a phase-matched angle, interact with the detection medium and generate anti-Stokes light (CARS signal) in a four-wave mixing manner, and invert by measuring the intensity and spectral line shape of the CARS signal To detect the temperature, concentration and other parameter information of the medium, the CARS technology is a single-point measurement technology. [0003] figure 1 The measurement optical path and device schematic diagram of USED (Unstable-resonator Spatially Enhanced Detec...

AI Technical Summary

Problems solved by technology

[0007] The present invention is to provide a collinear temperature measuring device of CARS technology and TDLAS technology, which solves the problem of inconsistency in the detection areas of the two in joint temperature measurement, makes TDLAS technology laser pass through the detection point of CARS technology, and reduces the complexity of the measurement system at the same time degree, so that the two share the transmitter and receiver

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