A Fixed-point Wavelength Modulation Gas Concentration Measuring Device Based on Wavenumber Drift Correction and Its Measurement Method
A technology of gas concentration measurement and wavelength modulation, applied in the field of optical measurement, it can solve the problems that the database cannot meet the measurement requirements, the wave number drift of the laser output center, and affect the accuracy of gas concentration measurement, so as to achieve long-term stable monitoring and spectrum. Narrow range for multi-spectral coupling measurements
Active Publication Date: 2021-09-28
SOUTHEAST UNIV
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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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[0040] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings, but the scope of protection claimed by the present invention is not limited thereto.
[0041] Such as figure 1 As shown, the fixed-point wavelength modulation gas concentration measurement device based on wave number drift correction of the present invention sequentially includes a signal generation module 1, a gas measurement module 2, a signal receiving module 3 and a signal processing module 4; the signal generation module 1 includes a function generator 5 , laser controller 6, distributed feedback laser (DFB) 7, fiber optic beam splitter 8 and fiber optic collimator 9; The heating module 12 outside 11; the signal receiving module 3 is composed of three photodetectors 15; the gas 14 to be measured enters the measuring pool 11 with gas after being preheated by the heating pipe belt 13, and the heating module 12 keeps the measuring pool 11 maint...
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The invention discloses a fixed-point wavelength modulation gas concentration measurement device based on wave number drift correction, and also discloses the above-mentioned fixed-point wavelength modulation gas concentration measurement method based on wave number drift correction; the invention corrects the gas concentration through real-time monitoring of the wave number of the laser output center , to overcome the adverse effects of the drift of the light output center on the measurement during the long-term operation of the laser, and to realize the accurate measurement of the wavelength modulation of the fixed point without calibration; the method of the present invention does not require an additional reference gas pool to calibrate the gas concentration, which is more conducive to field measurement in harsh environments; In addition, the harmonic signal adopted by the method of the present invention has a narrow spectrum occupation range, which is beneficial to multi-spectral coupling measurement and facilitates simultaneous online measurement of multi-component gas concentrations; at the same time, the method of the present invention uses the line width obtained from the measurement to participate in the calculation of gas concentrations without the need for Using too many parameters in the spectral database eliminates the influence of spectral parameters and component concentration uncertainties.
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...
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IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/01G01N21/39
Inventor 周宾祝仰坤王一红
Owner SOUTHEAST UNIV