A NOx and SO2 gas analyzer using deep-UV and violet light-emitting diodes for continuous emissions monitoring systems

Ryoichi Higashi; Yu Taniguchi; Kozo Akao; Kazuhiro Koizumi; Noritomo Hirayama; Yoshiaki Nakano

doi:10.1117/12.2036159

27 February 2014 A NO_x and SO₂ gas analyzer using deep-UV and violet light-emitting diodes for continuous emissions monitoring systems

Ryoichi Higashi, Yu Taniguchi, Kozo Akao, Kazuhiro Koizumi, Noritomo Hirayama, Yoshiaki Nakano

Author Affiliations +

Proceedings Volume 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII; 90031F (2014) https://doi.org/10.1117/12.2036159
Event: SPIE OPTO, 2014, San Francisco, California, United States

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%.

Citation Download Citation

Ryoichi Higashi, Yu Taniguchi, Kozo Akao, Kazuhiro Koizumi, Noritomo Hirayama, and Yoshiaki Nakano "A NO_x 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); https://doi.org/10.1117/12.2036159

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