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, "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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