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Proceedings Paper

A NOx and SO2 gas analyzer using deep-UV and violet light-emitting diodes for continuous emissions monitoring systems
Author(s): Ryoichi Higashi; Yu Taniguchi; Kozo Akao; Kazuhiro Koizumi; Noritomo Hirayama; Yoshiaki Nakano
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Paper 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%.

Paper Details

Date Published: 27 February 2014
PDF: 6 pages
Proc. SPIE 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII, 90031F (27 February 2014); doi: 10.1117/12.2036159
Show Author Affiliations
Ryoichi Higashi, Fuji Electric Co., Ltd. (Japan)
The Univ. of Tokyo (Japan)
Yu Taniguchi, Fuji Electric Co., Ltd. (Japan)
Kozo Akao, Fuji Electric Co., Ltd. (Japan)
Kazuhiro Koizumi, Fuji Electric Co., Ltd. (Japan)
Noritomo Hirayama, Fuji Electric Co., Ltd. (Japan)
Yoshiaki Nakano, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 9003:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Martin Strassburg, Editor(s)

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