High sensitivity simultaneous measurements of atmospheric NO2 and HONO using incoherent broadband cavityenhanced absorption spectroscopy (IBBCEAS) were developed. A near-ultraviolet light emitting diode (LED) peaked at 372 nm was used as light source of the IBBCEAS instrument to measure the absorption of NO2 and HONO in the spectral range of 361-378 nm. Concentrations of atmospheric NO2 and HONO were retrieved from the absorption spectra recorded in the absence of atmospheric aerosols and the average detection limits of 2.9 ppbv for NO2 and 1.2 ppbv for HONO with an acquisition time of 5 min were achieved. The results demonstrated high sensitivity of this measurement technique based on IBBCEAS, which is a promising technique for measurements of atmospheric trace gases.
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Liuyi Ling ; Pinhua Xie ; Min Qin ; Renzhi Hu ; Nina Zheng, et al.
Simultaneous measurements of atmospheric NO2 and HONO using IBBCEAS with a near-ultraviolet LED
", Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 856310 (November 20, 2012); doi:10.1117/12.999572; http://dx.doi.org/10.1117/12.999572