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1 Environment Protection Engineering

1 2023

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Ozone detection based on an nitrogen oxide photoacoustic spectroscopy system and chemical reaction

Jin Huawei, Ji Haitao, Wang Haowei, Li Shuo

Environment Protection Engineering

2023

Vol. 49, nr 4

73--87

Ozone is known as a "god-given purifying agent", and its quantitative detection is of great significance. A low-cost photoacoustic spectroscopy (PAS) which is based on absorption at the low-power blue diode emitting at 403.65 nm has been used for nitrogen oxide (NO2) concentration measurements. According to the formula of nitric oxide (NO) reaction and ozone (O3) production of NO2 and the differential detection method, a dual-channel PAS system for O3 detection is reported. The consistency of NO2 detection with the dual-channel photoacoustic spectroscopy system is good by contrast. The coefficient of determination R2 can still reach 0.846. An intercomparison between the system and a cavity ring-down system (CRDS) was shown to verify the accuracy. The results showed a linear correction factor (R2) of 0.943 in a slope of 0.862±0.002, with an offset of (0.773±0.128) ppb. In addition, the measurement of O3 using the dual-channel cavity photoacoustic spectroscopy technique was deployed. These observations indicate that O3 concentrations can be effectively observed with the dual-channel PAS instrument.