A field-portable, laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases

Gibson, G., Monk, S.D. and Padgett, M.J. (2002) A field-portable, laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases. Journal of Modern Optics, 49(5-6), 769 -776. (doi:10.1080/09500340110108639)

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Publisher's URL: http://dx.doi.org/10.1080/09500340110108639

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 mu m 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles
Authors: Gibson, G., Monk, S.D., and Padgett, M.J.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Modern Optics
ISSN:0950-0340

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