10 November 1987 A Highly Sensitive And Compact SO2 Gas Sensor Using A Pbsnte Laser
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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.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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