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Proceedings Paper

Remote tuneable 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 detected in a large Fresnel lens on the sensor. 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.

Paper Details

Date Published: 18 May 2009
PDF: 12 pages
Proc. SPIE 7356, Optical Sensors 2009, 73560Y (18 May 2009); doi: 10.1117/12.820567
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. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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