Fixed point wavelength modulation gas concentration measurement device and measurement method based on wave number drift correction

Abstract

The invention discloses a fixed point wavelength modulation gas concentration measurement device based on wave number drift correction, and further discloses a fixed point wavelength modulation gas concentration measurement method based on wave number drift correction. According to the invention, by monitoring wave number correction gas concentration of a light emergent center of a laser in real time, bad influence of drift of the light emergent center on measurement in the long-term operation of the laser is overcome, and accurate measurement of calibration-free fixed point wavelength modulation is implemented; the method disclosed by the invention does not require an additional reference gas pool for calibrating gas concentration and is more beneficial to field severe environment measurement; in addition, a harmonic signal adopted by the method disclosed by the invention is narrow in spectrum occupied range, so as to benefit to multispectrum coupling measurement and facilitate implementing simultaneous online measurement on gas concentration of multiple components; and meanwhile, the method disclosed by the invention utilizes a line width obtained by measurement to participate incalculation on the gas concentration without utilizing excessive parameters in a spectral database, thereby eliminating influence of indeterminacy of spectrum parameters and component concentration.

Description

technical field [0001] The invention relates to a fixed-point wavelength modulation gas concentration measurement device based on wave number drift correction, and also relates to the above-mentioned fixed-point wavelength modulation gas concentration measurement method based on wave number drift correction, which belongs to the field of optical measurement technology. Background technique [0002] In recent years, although the process of industrialization has improved the quality of life and economic level of urban residents, it has also aggravated air pollution. With the society's increasing emphasis on environmental protection and the need to ensure safe and efficient industrial production, it is of great significance to accurately detect the concentration of atmospheric environmental gas pollutants and industrial process gases. Research and manufacturing can work on site for a long time, and it is accurate and fast The technology and equipment for accurately measuring ga...

AI Technical Summary

Problems solved by technology

However, in an industrial environment with complex gas components, the gas composition and its concentration are unknown, so databases such as HITRAN cannot meet the measurement requirements

At the same time, during the gas concentration measurement process, environmental temperature changes, driving current and temperature drift, circuit aging and other issues will cause the center wave number of the laser output to drift, thus affecting the accuracy of gas concentration measurement

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