Parameter optimization in a methane detection system using a broadband source and interferometric signal processing

Wei Jin; George Stewart; Brian Culshaw; Stuart C. Murray; David Pinchbeck

doi:10.1117/12.170655

10 March 1994 Parameter optimization in a methane detection system using a broadband source and interferometric signal processing

Wei Jin, George Stewart, Brian Culshaw, Stuart C. Murray, David Pinchbeck

Author Affiliations +

Proceedings Volume 2068, Chemical, Biochemical, and Environmental Fiber Sensors V; (1994) https://doi.org/10.1117/12.170655
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

A D-fiber evanescent field methane sensor has been reported by Culshaw et al., where a sinusoidally modulated Fabry-Perot interferometer was used for signal processing. To optimize the sensitivity, it is essential to establish a relation between output signal, methane concentration, and certain other key parameters. Previous work with open-path cells, which use a sawtooth driven Fabry-Perot interferometer, shows a noise-limited detection level of +/- 0.003% methane (1s time constant). However, no analytic expression has been reported to relate the key parameters in the system. In this paper, we report such a relation and calculate the optimal values of some key parameters.

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Wei Jin, George Stewart, Brian Culshaw, Stuart C. Murray, and David Pinchbeck "Parameter optimization in a methane detection system using a broadband source and interferometric signal processing", Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); https://doi.org/10.1117/12.170655

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