Hyperspectral light source scanning interval selection method based on temperature sensitive factors

Abstract

In order to solve the technical problem that a spectral line selection method in hyper-spectral absorption measurement only aims at discrete spectral lines and is not suitable for continuous broadband spectral scanning range selection, the invention provides a hyper-spectral light source scanning interval selection method based on a temperature sensitive factor. The method specifically comprises the following steps: 1) preliminarily estimating the temperature T and the pressure P of a to-be-measured environment and the mole fraction X of to-be-measured gas molecules, and calculating the absorption intensity and the temperature sensitive factor of each absorption spectral line of the gas molecules in the spectral range of [lambda 1, lambda N] in the to-be-measured environment by using a spectral database; 2) selecting the scanning width delta lambda of a hyper-spectral light source, and calculating the temperature measurement uncertainty epsilon (T, lambda j) in a spectrum section [lambda j, lambda j + delta lambda] by taking lambda j as an initial wavelength; and 3) comparing the temperature measurement uncertainty epsilon (T, lambdaj) calculated at different initial wavelengths lambdaj, and obtaining the optimal scanning interval of the hyper-spectral light source in the spectral range [lambda1, lambdaN] corresponding to the spectral section interval [lambdam, lambdam + delta lambdam] corresponding to the minimum value epsilon (T, lambdam) of the temperature measurement uncertainty.

Description

technical field [0001] The invention belongs to the technical field of laser absorption spectroscopy, and in particular relates to a method for selecting a scanning interval of a hyperspectral light source based on a temperature sensitive factor. Background technique [0002] Tunable diode laser absorption spectroscopy (TDLAS) is one of the most widely used absorption spectroscopy techniques. This technique uses a tunable semiconductor laser as the laser light source, and can obtain high-precision absorption spectral data. However, tunable diode laser light sources, including distributed feedback lasers and vertical cavity surface emitting lasers, have extremely narrow wavelength tuning ranges, and the number of absorption lines that can be detected in a single scan is small, so the obtained absorption spectrum information It is also relatively limited, and it is impossible to measure multi-spectral lines and multi-gas components, which greatly limits the measurement effici...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem that the spectral line selection method in the existing hyperspectral absorption measurement is only for discrete spectral lines and is not suitable for continuous broadband spectral scanning range selection, the present invention provides a hyperspectral light source scanning interval based on temperature sensitivity factors The selection method is used to guide the selection of the light source scanning interval in the hyperspectral absorption measurement. Using this method, the light source scanning range suitable for different application scenarios can be selected more conveniently and quickly

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