Application of Gas Photoacoustic Spectroscopy Optical Detection Technology to SO2F2 Gas Concentration Detection

In this paper, the influence of the SO2F2 on the spectral absorption capacity under the background of the SF6 macro-molecular gas and the influence of the temperature and pressure on spectral absorption characteristics of the measured gas are studied. Through the comprehensive comparative study of different spectral analysis technologies, the best technology is selected for gas detection. Select the low adsorption material suitable for SO2F2 gas optical absorption cell, study the anti-interference characteristics of the optical absorption cell by optically designing the technical scheme of long optical path and small volume gas detection optical absorption cell, and study the mid infrared laser driving, small signal detection demodulation and concentration inversion algorithm. Alternative absorption line of SO2F2 at 3619nm (2760cm-1) is relatively narrow, while its alternative absorption line at 6623nm (1503cm-1) is relatively wide. Therefore, the photo-acoustic spectroscopy is suitable for detecting SO2F2 at 6623nm (1503cm-1) and 7463nm (1340cm-1). The SO2F2 optical gas absorption cell and the charged detection device of mid infrared laser spectrum are developed, and the field adaptability of the charged detection device and the pilot application of charged detection are studied.