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Proceedings Paper

Parameter optimization in a methane detection system using a broadband source and interferometric signal processing
Author(s): Wei Jin; George Stewart; Brian Culshaw; Stuart C. Murray; David Pinchbeck
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Paper 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.

Paper Details

Date Published: 10 March 1994
PDF: 11 pages
Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); doi: 10.1117/12.170655
Show Author Affiliations
Wei Jin, Univ. of Strathclyde (United Kingdom)
George Stewart, Univ. of Strathclyde (United Kingdom)
Brian Culshaw, Univ. of Strathclyde (United Kingdom)
Stuart C. Murray, British Gas plc (United Kingdom)
David Pinchbeck, British Gas plc (United Kingdom)

Published in SPIE Proceedings Vol. 2068:
Chemical, Biochemical, and Environmental Fiber Sensors V
Robert A. Lieberman, Editor(s)

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