Gas temperature probability density distribution reestablishment method based on single optical path and multiple spectra

Abstract

The invention provides a gas temperature probability density distribution reestablishment method based on a single optical path and multiple spectra. The method comprises the following steps: causinglaser of multiple absorption spectrum segments capable of covering a certain absorption molecule in a gas to be tested to pass through a tested gas area along a single optical path to obtain absorptivity integral measurement data corresponding to the multiple absorption spectrum segments; constructing an integral equation set for solving gas temperature probability density distribution by using the line intensity and the absorptivity integrals of the absorption spectrum segments; and performing normalization and discretization processing on the integral equation set to solve a polynomial fitting parameter of the gas temperature probability density distribution, and calculating the gas temperature probability density distribution. Compared with a multi-view multi-spectrum imaging system, the gas temperature probability density distribution reestablishment method provided by the invention has the advantages that the structure is simple structure, few optical windows are required, a limited number of discrete absorption spectrum segments are used, the gas temperature probability density distribution can be reestablished without the prior information of temperature distribution, the reestablishment speed is high, the effect is excellent, and the application prospect in the field of non-contact non-uniform temperature distribution measurement is wide.

Description

technical field [0001] The present invention relates to a gas temperature probability density distribution reconstruction method based on single optical path and multi-spectrum, in particular to a high-precision single-optical path multi-spectral gas temperature probability density distribution reconstruction method when the measured temperature parameters are non-uniformly distributed. It does not require the intensity of the spectral line to be continuous and has a wide range of applications. Background technique [0002] Tunable Laser Absorption Spectroscopy (TDLAS) is an effective method in the field of accurate measurement of temperature and substance concentration due to its fast, non-invasive, sensitive, and on-site measurement of multiple flow field parameters, and is widely used in combustion diagnosis. , combustion control and other aspects, the application potential is huge and the prospect is promising. [0003] Single-path laser absorption spectroscopy with two...

AI Technical Summary

Problems solved by technology

But the problem with this is that it requires prior information

However, this method of realizing temperature field reconstruction requires multiple optical windows to obtain multiple sets of multiple projection measurement data, which is a limitation for some system devices that do not recommend or allow opening of optical windows

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