SYSTEM BASED ON AN OPTICAL CAVITY WITH OPTICAL FEEDBACK FOR GAS TRACE DETECTION USING RAMAN SPECTROMETRY Russian patent published in 2023 - IPC G01N21/65 G01J3/44 

FIELD: gas analysis.

SUBSTANCE: invention relates to a method for analysing gases using Raman spectrometry, which includes the steps of generating a laser beam by a laser source (100) with generation frequency tuning in a frequency range containing a set of resonant modes of an optical resonator (180) holding the analysed gases; delivery of the laser beam to the input of the resonator; removing the feedback beam from the resonator, which, tuned in phase and amplitude, is sent to the source; during tuning of the generation frequency of detection of peaks (221-229) of light intensity in the laser beam in the resonator, the phase of the feedback beam is adjusted to reduce the asymmetry of these peaks; the amplitude of the feedback beam is adjusted to reduce the intervals with zero intensity between the specified peaks; and performing a spectral analysis of the light rigidly scattered in the resonator to determine the composition of the analysed gases.

EFFECT: increase in the compactness, stability, reliability and sensitivity of the gas analysis system.

17 cl, 5 dwg