10 November 1987 A Highly Sensitive And Compact SO2 Gas Sensor Using A Pbsnte Laser
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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.
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Masaji Dohi, Masaji Dohi, Akira Sawada, Akira Sawada, Iwao Sugiyama, Iwao Sugiyama, Koji Shinohara, Koji Shinohara, Hiroyuki Ishizaki, Hiroyuki Ishizaki, } "A Highly Sensitive And Compact SO2 Gas Sensor Using A Pbsnte Laser", Proc. SPIE 0819, Infrared Technology XIII, (10 November 1987); doi: 10.1117/12.941833; https://doi.org/10.1117/12.941833
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