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Proceedings Paper

Remote methane sensor using Tunable Diode Laser Spectroscopy (TDLS) via a 1W Raman Source
Author(s): David Mitchell; Kevin Duffin; Walter Johnstone
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Paper Abstract

We report a long-range near-IR methane sensor for inspection of natural gas collection, storage sites and pipeline networks. The principle is that a laser carrier beam is directed at the target surface across a test path and the backscatter from the surface is collected via a large Fresnel lens onto the photoreceiver. A Raman amplifier has been designed to amplify the TDLS optical signal generated by a 1650.95nm DFB laser diode to over 1W CW. Combining the high power output of the Raman amplifier and the highly sensitive TDLS technique, we may report 100ppm.m sensitivity at more than 100m by extrapolation.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750350 (5 October 2009); doi: 10.1117/12.835810
Show Author Affiliations
David Mitchell, Univ. of Strathclyde (United Kingdom)
Kevin Duffin, Univ. of Strathclyde (United Kingdom)
Walter Johnstone, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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