Laser gas analyzer with automatic light path alignment function

Abstract

The invention relates to a laser gas analyzer with an automatic light path alignment function. The laser gas analyzer comprises a central control unit, an emitting unit and a receiving unit, wherein the central control unit is mounted in a control room; the emitting unit and the receiving unit are mounted on the industrial site; a laser device module is further arranged in the central control unit; a laser device emits laser and is connected to the emitting unit through a collimation optical fiber; the laser gas analyzer is characterized in that a two-dimensional scanning adjustment parabolic reflector for aligning laser rays and emitting the laser rays to the receiving unit. According to the laser gas analyzer, the two-dimensional scanning adjustment parabolic reflector is used for changing the emitting direction of emitted light and finding out a position with the highest light intensity in cooperation with a detection circuit and control software, namely the position with light intensity alignment, so that automatic alignment of the light path is realized, and light path misalignment caused by vibration, expansion caused by heat and shrinkage caused by coldness on the working site can be automatically compensated; automatic light path alignment of the laser gas analyzer which works on line is realized, and the maintenance workload is reduced.

Description

technical field [0001] The invention belongs to the field of laser gas analysis instruments, and in particular relates to a laser gas analyzer which is suitable for harsh field applications and frees from alignment maintenance and automatically aligns optical paths. Background technique [0002] Semiconductor laser gas analyzer is a "real-time" and "on-line" gas monitoring device, which is often used in petrochemical, steel, cement, environmental protection, industrial online monitoring and other fields. Laser gas analyzer is a high-sensitivity gas analysis method. Its principle is that after the laser of a specific wavelength passes through the gas, it is absorbed by the specific absorption peak of the gas, resulting in attenuation of light intensity. The attenuation of light intensity can be accurately described by the Beer-Lambert law: [0003] I(v)=I 0 (v)exp[-S(T)φ(v)PXL] [0004] where I(v),I 0 (v) are the light intensity after the laser passes through the gas and ...

AI Technical Summary

Problems solved by technology

[0005] The advantage of the laser gas analyzer lies in the "online measurement" at the industrial site. The laser gas analyzer is used in the industrial site to work through the detection of parallel light. However, due to the complexity of the industrial site environment, the laser gas analyzer works stably for a long time. the performance of the

For example: due to the strong vibration on site and the large temperature changes in the site where the laser gas analyzer is installed, the laser gas analyzer that was working normally was out of alignment under the influence of thermal expansion and contraction, and could not work normally. Engineers are required to readjust the optical path, which requires a lot of maintenance work, and the process of aligning the optical path of the laser gas analyzer is a lot of work

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