Tunable diode laser absorption signal time-frequency conversion method
A diode laser and frequency conversion technology, which is applied in the field of laser diagnosis and measurement, can solve the problems of different refractive index and inapplicability, and achieve the effect of simple operation, high precision and low cost
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[0037] like figure 1 As shown, a tunable diode laser absorption signal time-frequency conversion method is applied to a single-line TDLAS measurement spectrum, including:
[0038] S1 builds a wavelength scanning-direct absorption spectrum measurement system to collect the transmission signal of the wavelength etalon and the measured absorption signal of the gas to be measured, and the absorption signal has only one absorption peak.
[0039] further, as figure 2 As shown, the wavelength scanning-direct absorption spectroscopy measurement system includes a function generator, a near-infrared tunable semiconductor laser, an F-P etalon, a standard concentration gas cell and a data acquisition module.
[0040] Specifically, methane was selected as the measured gas in the experiment, and a gas cell with a certain concentration of CH was continuously introduced into the gas cell made of quartz glass tubes. 4 Standard gas. The function generator is used to generate a sawtooth wave...
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