Multi-wavelength laser for measuring multi-component gas and measuring method thereof

Abstract

The invention relates to a multi-wavelength laser for measuring multi-component gas and a measuring method thereof. The multi-wavelength laser comprises at least two semiconductor lasers, a high-speed optical fiber multiplexer and an output optical fiber collimator, wherein each semiconductor laser is correspondingly connected with a laser current temperature controller; the high-speed optical fiber multiplexer comprises a lens optical fiber array, an electro-optical beam deflector, an electro-optical beam deflection driving controller and an optical fiber collimator, the laser in different wavelength of the semiconductor laser is input into the electro-optical beam deflector, all paths of laser are deflected in the electro-optical beam deflector and multiplexed into the same light path to be output, the laser is respectively conducted to the output optical fiber collimator at different periods of time through the optical fiber collimator to realize the high-speed time division multiplexing of the laser in different wavelength, a multi-wavelength laser light source is formed, and the outgoing laser of the output optical fiber collimator is respectively used for measuring differentgases to be measured in the corresponding period of time. The invention introduces a time division multiplexing idea and has the advantages of little laser power consumption, high multiplexing speed and good stability.

Description

technical field [0001] The invention belongs to the technical field of gas measurement and detection, relates to tuned semiconductor laser absorption spectroscopy (TunableDiode Laser Absorption Spectroscopy, TDLAS), and relates to a multi-wavelength laser for measuring multi-component gases and a measurement method thereof. Background technique [0002] The measurement and detection of gases, especially the detection of flammable, explosive, toxic and harmful gases, is crucial to industrial and agricultural production, people's lives, scientific research and national security. Optical gas detection technology has many advantages that other detection technologies cannot match, such as high sensitivity, fast response speed, and large dynamic range. The high monochromaticity, directivity and high intensity of laser make it an ideal tool for gas detection. In recent years, the rapid development of tuned semiconductor laser absorption spectroscopy technology provides a relatively...

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is: in the existing measurement and detection of gas by tuning semiconductor laser absorption spectroscopy technology, it is difficult for the tuning range of a laser to cover the absorption lines of different gases. Generally, a laser can only measure one kind of gas. Existing technologies that can realize laser multiplexing have large laser power loss, or slow laser conversion speed during multiplexing, and poor anti-interference ability

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