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Proceedings Paper

A Highly Sensitive And Compact SO2 Gas Sensor Using A Pbsnte Laser
Author(s): Masaji Dohi; Akira Sawada; Iwao Sugiyama; Koji Shinohara; Hiroyuki Ishizaki
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Paper Abstract

We have developed a highly sensitive, compact SO2 gas sensor that uses a PbSnTe laser. To increase its sensitivity, we used wedge-shaped windows that decrease etalon fringes and a SO2 absorption line that is little influenced by water vapor and that has a strong coefficient. The etalon-fringe intensity of the optical system was reduced to 1 x 10-4 and the SO2 absorption line selected is 1380.9 cm-1. To make the sensor compact, we developed single-mode lasers to eliminate the need for a monochromator, used a 30-cm multipath cell with an optical path of 10 m and a liquid-nitrogen-cooled, small metal dewar to cool the laser. The sensor performs stably at 30 ppb over a range of 10°C to 35°C, has a sensitivity of 7 ppb RMS at a fixed temperature, and is 32 cm x 50 cm x 20 cm.

Paper Details

Date Published: 10 November 1987
PDF: 5 pages
Proc. SPIE 0819, Infrared Technology XIII, (10 November 1987); doi: 10.1117/12.941833
Show Author Affiliations
Masaji Dohi, Fujitsu Laboratories Ltd. (Japan)
Akira Sawada, Fujitsu Laboratories Ltd. (Japan)
Iwao Sugiyama, Fujitsu Laboratories Ltd. (Japan)
Koji Shinohara, Fujitsu Laboratories Ltd. (Japan)
Hiroyuki Ishizaki, Fujitsu Laboratories Ltd. (Japan)

Published in SPIE Proceedings Vol. 0819:
Infrared Technology XIII
Irving J. Spiro, Editor(s)

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