Field-portable laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases

Graham M. Gibson; Stephen Monk; Miles J. Padgett

doi:10.1117/12.454257

30 January 2002 Field-portable laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases

Graham M. Gibson, Stephen Monk, Miles J. Padgett

Proceedings Volume 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV; (2002) https://doi.org/10.1117/12.454257
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Graham M. Gibson, Stephen Monk, and Miles J. Padgett "Field-portable laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases", Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, (30 January 2002); https://doi.org/10.1117/12.454257

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