Mr. Xiao Qian Profile

Xiao Qian

at Anhui Univ.

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Proceedings Article | 17 April 2020 Paper

Measurement of NO2 using incoherent broadband cavity-enhanced absorption spectroscopy

Xiaoge Bian, Weikai Hu, Xiao Qian, Luhan Wang, Yan Xu, Sheng Zhou, Jingsong Li

Proceedings Volume 11455, 114553N (2020) https://doi.org/10.1117/12.2564700

KEYWORDS: Absorption, Reflectivity, Mirrors, Rayleigh scattering

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Incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) is increasingly finding applications in atmosphere chemical, environmental monitoring, and medical diagnostics, etc. The paper describes the application of IBBCEAS for measurements of atmospheric NO₂ using a blue LED centered at the wavelength of about 445 nm. The reflectivity of the cavity mirror is calibrated based on the difference between the Rayleigh scattering cross sections of N₂ and He. The detection limit for NO₂ detection is related to the integration time and averaging number. This issue is addressed by performing experimental measurements under different integration time and averaging number to determine the optimum condition. The measurement results are useful for the design of a spectroscopic sensor for monitoring atmosphere NO₂.

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