19 August 1998 Compact diode-laser-based sensor for detection of atmospheric methane
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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