27 February 2014 A NOx and SO2 gas analyzer using deep-UV and violet light-emitting diodes for continuous emissions monitoring systems
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Abstract
A nitrogen oxides (NOx) and sulfur dioxide (SO2) gas analyzer using deep ultraviolet (DUV) and violet light- emitting diodes (LEDs) is developed. The LEDs with wavelengths of 280 nm and 400 nm were alternately turned on to detect SO2 and nitrogen dioxide (NO2) absorption. Nitric oxide (NO) was converted to NO2 with an ozonizer. In order to reduce water interference caused by water adsorption onto an inner surface of a gas ow cell, collimating optics reducing re ected lights were designed. As a result, less than 1% by full scale (%F.S.) of uctuation, 2%F.S. of drift and 0.5%F.S. of water interference were achieved in 0-50 ppm concentration range. Conversion efficiency from NO to NO2 was over 95%.
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Ryoichi Higashi, Ryoichi Higashi, Yu Taniguchi, Yu Taniguchi, Kozo Akao, Kozo Akao, Kazuhiro Koizumi, Kazuhiro Koizumi, Noritomo Hirayama, Noritomo Hirayama, Yoshiaki Nakano, Yoshiaki Nakano, } "A NOx and SO2 gas analyzer using deep-UV and violet light-emitting diodes for continuous emissions monitoring systems", Proc. SPIE 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII, 90031F (27 February 2014); doi: 10.1117/12.2036159; https://doi.org/10.1117/12.2036159
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