1 September 1999 Urban gas monitoring system using optical sensors
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Proceedings Volume 3746, 13th International Conference on Optical Fiber Sensors; 37463Z (1999) https://doi.org/10.1117/12.2302133
Event: 13th International Conference on Optical Fiber Sensors, 1999, Kyongju, Korea, Republic of
Abstract
We have developed a methane monitoring system using a 1.66 μm distributed-feedback semiconductor laser. The detection limit of the system is 70 ppb m in concentration pathlength product with the time constant of 1 s. This high sensitivity is achieved by the second-harmonic detection of wavelength modulation frequency of the laser whose center wavelength is stabilized on an the absorption line of methane.

The system was installed on a vehicle in combination with a positioning system and a mobile GIS that enabled to record and indicate gas leakage points from buried pipelines on the digital map at the real time.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hideo Tai, Hideo Tai, } "Urban gas monitoring system using optical sensors", Proc. SPIE 3746, 13th International Conference on Optical Fiber Sensors, 37463Z (1 September 1999); doi: 10.1117/12.2302133; https://doi.org/10.1117/12.2302133
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