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Real-Time Monitoring of SO<sub>2</sub> Emissions Using a UV Camera with Built-in NO<sub>2</sub> and Aerosol Corrections
oleh: Yuanhui Xiong, Kuijun Wu, Guangbao Yu, Zhenwei Chen, Linmei Liu, Faquan Li
Format: | Article |
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Diterbitkan: | MDPI AG 2022-05-01 |
Deskripsi
Nitrogen dioxide (NO<sub>2</sub>) absorption correction of the sulfur dioxide (SO<sub>2</sub>) camera was demonstrated for the first time. The key to improving the measurement accuracy is to combine a differential optical absorption spectroscopy (DOAS) instrument with the SO<sub>2</sub> camera for the real-time NO<sub>2</sub> absorption correction and aerosol scattering correction. This method performs NO<sub>2</sub> absorption correction by the correlation between the NO<sub>2</sub> column density measurement of the DOAS and the NO<sub>2</sub> optical depth of the corresponding channel from the SO<sub>2</sub> camera at a narrow wavelength window around 310 and 310 nm. The error of correction method is estimated through comparison with only using the second channel of the traditional SO<sub>2</sub> camera to correct for aerosol scattering and it can be reduced by 11.3% after NO<sub>2</sub> absorption corrections. We validate the correction method through experiments and demonstrate it to be of greatly improved accuracy. The result shows that the ultraviolet (UV) SO<sub>2</sub> camera system with NO<sub>2</sub> absorption corrections appears to have great application prospects as a technology for visualized real-time monitoring of SO<sub>2</sub> emissions.