Tunable diode laser based gas detectors are now being used in a wide variety of applications for safety and environmental interest. A fiber-distributed multi-channel open-path H2S sensor based on tunable diode laser absorption spectroscopy (TDLAS) is developed, the laser used is a telecommunication near infrared distributed feed-back (DFB) tunable diode laser, combining with wavelength modulation spectroscopy technology, a detection limit of 20 ppm.m is demonstrated. Multi-channel detection is achieved by combining optical fiber technique. An on-board reference cell provides on-line sensor calibration and almost maintenance-free operation. The sensor is suitable for large area field H2S monitoring application.
© 2007 Chinese Optics Letters
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6380) Spectroscopy : Spectroscopy, modulation
Dong Chen, Wenqing Liu, Yujun Zhang, Jianguo Liu, Ruifeng Kan, Min Wang, Xi Fang, and Yiben Cui, "Fiber-distributed multi-channel open-path H2S sensor based on tunable diode laser absorption spectroscopy," Chin. Opt. Lett. 5, 121-124 (2007)