China has made new progress in the study of wavelength modulation absorption spectroscopy

[ Instrument Network Instrument Development ] Recently, Gao Xiaoming, a researcher at the Anhui Institute of Optics and Fine Mechanics, Institute of Material Science, Chinese Academy of Sciences, made new progress in improving the stability of the wavelength modulation absorption spectroscopy system. The relevant research results are "wavelength modulating spectroscopy gas." sensing locking the laser frequency and intensity correction technology "(laser frequency locking and intensity normalization in wavelength modulation spectroscopy for sensitive gas sensing) was published in international academic journals Optics Express.

Comparison of ALLAN variance results under different conditions

Spectral technology has a wide range of applications in the field of atmospheric trace gas detection, medical diagnostics and industrial process control. Wang Guishi, an associate researcher of the research group, used the scanning frequency-locking method to lock the laser output frequency for the first time, avoiding the laser frequency drift and improving the stability of the system. At the same time, by real-time monitoring the amplitude of the modulated signal of the non-absorptive section as a reference, the real-time correction of the detected intensity fluctuation during the measurement process is realized, and the influence of the laser intensity variation on the concentration measurement result is eliminated, and the stability and accuracy of the measurement system are further improved. .

This technology has important application value for improving the performance of spectrometers. The research work was funded by the National Key R&D Program and the National Natural Science Foundation.

(Original title: Hefei Research Institute has made new progress in the study of wavelength modulation absorption spectroscopy technology)