Gas concentration detection system based on wavelength modulation spectrum and gas concentration detection method based on wavelength modulation spectrum

Abstract

The invention relates to a gas concentration detection system based on a wavelength modulation spectrum. A sine wave signal output end of a first signal generator of the system is connected with a summator; a triangular wave signal output end of a second signal generator is connected with the summator; the signal output end of the summator is connected with a pulse width modulator; the signal output end of the pulse width modulator is connected with a laser drive; the laser drive signal input end of the laser drive is connected with a distribution type feedback laser; the laser signal output end surface of the distribution type feedback laser faces to the laser signal incidence port of a gas concentration detection gas chamber; the signal input end of a laser detector faces to the laser signal outgoing port of the gas concentration detection gas chamber; the laser sensing signal output end of the laser detector is connected with a signal input end of a processor; the cosine wave signal output end of the first signal generator is connected with a locking amplifier; the signal output end of the locking amplifier is connected with the processor; the triangular wave signal output end of the second signal generator is connected with the processor. By adopting the gas concentration detection system, the concentration of gases can be accurately measured.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a gas concentration detection system and detection method based on wavelength modulation spectrum. Background technique [0002] In the existing gas concentration detection system, the modulation method of the light source adopted is a separate triangular wave or a separate sine wave modulation. This light source adjustment method cannot provide the same modulation signal (a separate triangle wave or a separate sine wave) during demodulation. ) into a 90-degree demodulation signal, so the modulation accuracy of this light source modulation is not high, which affects the accuracy of the concentration detection result of the gas concentration detection system. Contents of the invention [0003] The object of the present invention is to provide a gas concentration detection system and detection method based on wavelength modulation spectroscopy, which can accurately ...

AI Technical Summary

Problems solved by technology

[0002] In the existing gas concentration detection system, the modulation method of the light source adopted is a separate triangular wave or a separate sine wave modulation. This light source adjustment method cannot provide the same modulation signal (a separate triangle wave or a separate sine wave) during demodulation. ) into a 90-degree demodulation signal, so the modulation accuracy of this light source modulation is not high, which affects the accuracy of the concentration detection results of the gas concentration detection system

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