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25 October 2016 Development of a broadband cavity enhanced UV-LED spectrometer for the detection of atmospheric HONO and NO2
Tao Wu, Ruxiao Xia, Weidong Chen, Xingdao He
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Proceedings Volume 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology; 1015603 (2016) https://doi.org/10.1117/12.2243756
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
An incoherent broadband cavity enhanced UV-LED spectrometer (IBBCEAS) was developed to detect atmospheric HONO and NO2. Using a UV light emitting diode (LED) operating at ~ 366 nm in combination with a high finesse optical cavity, HONO and NO2 were able to be simultaneously measured with high sensitivity. Detection limits (for SNR=1) of 0.3 ppbv for HONO and 1 ppbv for NO2 were achieved with an optimum acquisition time of 120 s. Stability of the developed cavity enhanced UV-LED spectrometer has been characterized by means of an Allan variance analysis. Daytime and nighttime concentrations of atmospheric HONO and NO2 were measured and compared with data from LOPAP for HONO and blue light converter-based NOx analyzer for NO2. The present work performed in a real atmospheric environment demonstrates the feasibility of using IBBCEAS technique for interference (chemical and spectral) free measurement of HONO. Experimental detail will be presented, the problems encountered during the real atmospheric measurement will be discussed.
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Tao Wu, Ruxiao Xia, Weidong Chen, and Xingdao He "Development of a broadband cavity enhanced UV-LED spectrometer for the detection of atmospheric HONO and NO2", Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 1015603 (25 October 2016); https://doi.org/10.1117/12.2243756
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KEYWORDS
NOx
Spectroscopy
Absorption spectroscopy
Atmospheric sensing
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