Citation: | LI Wen, CAI Yongqing, CHEN Mengfan, et al. Optical path simulation and design of NO rapid detection optical cavity structure[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(11): 2146-2152. doi: 10.13700/j.bh.1001-5965.2021.0105(in Chinese) |
According to the chemiluminescence reaction mechanism of nitric oxide and ozone, a new cylindrical total reflection S-type optical cavity design for rapid detection of nitric oxide gas is proposed. The optical cavity model is based on the total reflection S-type structure on the inner wall of the cylinder. Cylindrical light source is used as the light scattering element, so the chemiluminescence light is concentrated on the photosensitive surface of the detector with maximum efficiency, which strengthens the measurement signal of nitric oxide concentration and improves the detection accuracy. Optical software ZEMAX was used to simulate the optical path of the model. The comparative analysis showed that the chemiluminescence collection efficiency of the S-type optical cavity collection path was 36.6%, and is verified by experiments. The experimental results showed that in a certain range of concentration, there is a good linear relationship between the luminescence intensity of the reaction and the concentration of NO gas. The linear correlation was 0.999 2. In the range of 0‰~2.5‰, the detection limit was 0.001‰. The model is simple in structure and meets the national standards. Moreover, it provides a practical idea of design for the on-line exhaust gas detection.
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