Optimization design of sphere‐tube‐coupled photoacoustic cell and application of nitrogen dioxide detection

Abstract

Based on photoacoustic spectroscopy, a high-sensitivity sphere-tube-coupled photoacoustic cell suitable for gas detection in the ultraviolet to the nearinfrared band (UV-NIR) was developed. A diffuse reflection sphere with the inner wall coated with polytetrafluoroethylene (PTFE) was invoked as a long optical path cell, and the light beam was reflected multiple times on the inner wall of the sphere to increase the absorption path of the gas. An aluminum How to cite this article: Li Z, Liu J, Si G, Ning Z, Fang Y, Pan Y. Optimization design of spheretube-coupled photoacoustic cell and application of nitrogen dioxide detection.

Effects of thermal decomposition and adsorption on photoacoustic detection of nitrogen dioxide

“…Nitrogen dioxide is a toxic gas to organisms, and one of the main factors in forming acid rain, which is mainly discharged into the atmosphere through the burning process of substances [1,2] . As a gas detection technology, photoacoustic spectroscopy has the advantages of high sensitivity, fast response, and good selectivity [3][4][5][6][7] , and is widely used in the fields of atmospheric monitoring, medical diagnosis, combustion analysis, and electric power detection [8][9][10][11][12] . Recently, some scholars have developed NO2 photoacoustic detection setups [13][14][15][16][17] .…”