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A field-portable, laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases
Ist Teil von
Journal of modern optics, 2002-04, Vol.49 (5-6), p.769-776
Ort / Verlag
London: Taylor & Francis Group
Erscheinungsjahr
2002
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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 μm 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.