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Proceedings Paper

Field-portable laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases
Author(s): Graham M. Gibson; Stephen Monk; Miles J. Padgett
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Paper Abstract

We have developed a field portable optical gas sensor for the ultra sensitive detection of ethane. The system is based on an adaptation of a commercially available system, which uses a cryogenically cooled, lead-salt, laser diode at 3.34 microns and a multi-pass astigmatic Herriott sample cell. We have adapted this system to a second derivative wavelength modulation scheme giving a lower detection limit of less than 100 parts per trillion for a one second measurement time. Our custom designed software controls every aspect of the instrument operation from spectral scanning of the laser diode, to automatic calibration, optical alignment, spectral analysis and complete data logging.

Paper Details

Date Published: 30 January 2002
PDF: 6 pages
Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, (30 January 2002); doi: 10.1117/12.454257
Show Author Affiliations
Graham M. Gibson, Univ. of Glasgow (United Kingdom)
Stephen Monk, Univ. of Glasgow (United Kingdom)
Miles J. Padgett, Univ. of Glasgow (United Kingdom)


Published in SPIE Proceedings Vol. 4485:
Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV
Allen M. Larar; Martin G. Mlynczak, Editor(s)

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