Detection method of laser absorption spectrum detection system capable of expanding detection range in wide temperature range

Abstract

The invention relates to a detection method of a laser absorption spectrum detection system capable of expanding a detection range in a wide temperature range. The detection method of the laser absorption spectrum detection system comprises a laser, an absorption cell, a photoelectric detector, a signal processing unit and a controller. A temperature sensor is arranged in the absorption cell. According to the invention, the problem that an absorption spectrum detection system cannot realize a relatively large detection range in a high-sensitivity demodulation algorithm can be solved; the self-calibration of the detection system is realized by combining the characteristics of the two demodulation algorithms; the problem that self-calibration cannot be achieved in a special gas or environment is solved, meanwhile, the problem that the measurement accuracy of the sensor is low when the temperature change amplitude is large is solved, the requirement for practical application of the concentration sensor in an industrial field is met, and the method has important significance in improving wide application of the laser absorption spectrum technology in the field of gas detection.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a detection method of a laser absorption spectrum detection system capable of expanding the detection range in a wide temperature range. Background technique [0002] Laser absorption spectroscopy technology uses gas molecules to absorb specific wavelength bands of light, and can detect gas types, component concentrations and other parameters. Among them, a tunable diode laser is used as the light source, and the laser is tuned to output a certain wavelength range of laser light by changing the output current or temperature of the laser, so that it can scan single or multiple complete absorption lines of gas molecules to obtain high-resolution gas absorption spectra. , analyze the spectrum to obtain gas parameter information. Laser absorption spectroscopy technology has the characteristics of high sensitivity, fast, accurate, and passive detection. It has been widely used ...

AI Technical Summary

Problems solved by technology

[0004]In order to solve the problem that the high-sensitivity demodulation algorithm existing in the laser absorption spectroscopy detection system in the prior art cannot achieve a large detection range, and the automatic Calibration and temperature changes introduce the problem of inaccurate measurement. The invention provides a detection method for a laser absorption spectrum detection system that can expand the detection range in a wide temperature range.

Images