19 August 1998 Compact diode-laser-based sensor for detection of atmospheric methane
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Abstract
A portable room-temperature diode laser based on mid-infrared gas sensor was developed for open path measurements of methane in ambient air. This sensor is based on a continuous wave difference-frequency generation in periodically poled LiNbO3 near 3.3 micrometers , pumped by a solitary Fabry Perot type diode laser at 810 nm and a distributed Bragg reflector (DBR) diode laser at 1083 nm. IR frequency tuning between 3045 and 3170 cm-1 was performed by tuning the solitary GaAlAs diode laser. In-situ and open path detection of methane in atmosphere with sensitivity of 18 ppbm/Hz1/2 was performed and detection sensitivity was limited by intensity noise.
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Haishan Zhao, Haishan Zhao, Reinis Kanders, Reinis Kanders, Robert F. Curl, Robert F. Curl, Frank K. Tittel, Frank K. Tittel, } "Compact diode-laser-based sensor for detection of atmospheric methane", Proc. SPIE 3504, Optical Remote Sensing for Industry and Environmental Monitoring, (19 August 1998); doi: 10.1117/12.319514; https://doi.org/10.1117/12.319514
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