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

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

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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 mum 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: Article
Journal or Publication Title: Journal of Modern Optics
Additional Information: 15th National Quanturn Electronics and Photonics Conference, GLASGOW, SCOTLAND, SEP 03-06, 2001
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Science and Technology > Engineering
ID Code: 34823
Deposited By: Dr Stephen Monk
Deposited On: 09 Dec 2010 10:12
Refereed?: No
Published?: Published
Last Modified: 24 Jan 2014 05:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/34823

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