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Multi-point, fiber-optic gas detection with intra-cavity spectroscopy
Authors:Yan Zhang  Min Zhang  Wei Jin
Institution:

Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

Abstract:A novel intra-cavity fiber laser system is demonstrated for multi-point gas detection. The laser uses fiber Bragg gratings as wavelength-selective cavity mirrors and a tunable filter to tune the operating wavelength to the Bragg wavelength of a selected Bragg grating. The Bragg wavelengths of the gratings are chosen to be aligned to different absorption lines of a gas or gases, allowing gas concentrations at multiple locations to be determined.
Keywords:Fiber sensors  Multiplexing  Intra-cavity spectroscopy
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