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An open-path, hand-held laser system for the detection of methane gas.

By Ben van Well, Stuart Murray, Jane Hodgkinson, Russ D. Pride, Rainer Strzoda, Graham Gibson and Miles Padgett

Abstract

We have developed an open-path hand-held gas detector incorporating a distributed feedback InGaAs laser diode at 1.65 µm. Incorporated into a hand-held transceiver unit, the emitted laser beam is backscattered from nearby surfaces, collected and focused onto an amplified InGaAs detector using a 150 mm diameter plastic Fresnel lens. At ranges of 4–5 m, a typical backscattered signal is tens of nanowatts of laser light. Applying second derivative wavelength modulation spectroscopy gives a sensitivity to methane of better than 10 parts per million over a one metre path length. A number of demonstration units have been fabricated and successfully evaluated by end users

Topics: methane, wavelength modulation spectroscopy, instrumentation, infrared spectroscopy, remote detection
Publisher: Institute of Physics
Year: 2005
DOI identifier: 10.1088/1464-4258
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/1198
Provided by: Cranfield CERES
Journal:

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