Calibration-free gas parameter measurement method based on triangular wave modulation
A technology of gas parameter measurement and triangular wave, which is applied in the field of laser absorption spectroscopy, can solve the problem that the calibration-free gas concentration measurement method has not been published, and achieve the effect of improving the signal-to-noise ratio
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[0046] The wavelength modulation method of the present invention will be described in further detail below with reference to the accompanying drawings.
[0047] The calibration-free gas concentration measurement method based on triangular wave modulation of the present invention is different from the traditional wavelength modulation method using sine wave modulation. The measurement method proposed by the present invention first superimposes a high-frequency triangular wave modulation signal on a low-frequency scanning signal, and feedbacks to the distribution type ( The wavelength of the DFB) laser is periodically tuned to obtain an absorption signal with a high signal-to-noise ratio. Then verify the calibration-free wavelength modulation spectrum model on the basis of triangle wave modulation, and determine the feasibility of the calibration-free gas concentration measurement method based on triangle wave modulation. Finally, the time-frequency response model of DFB laser unde...
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