Near-infrared tunable laser diode spectroscopy: an easy way for gas sensing

Marc Larive; V. Henriot

doi:10.1117/12.276165

30 May 1997 Near-infrared tunable laser diode spectroscopy: an easy way for gas sensing

Marc Larive, V. Henriot

Proceedings Volume 3105, Chemical, Biochemical and Environmental Fiber Sensors IX; (1997) https://doi.org/10.1117/12.276165
Event: Environmental Sensing III, 1997, Munich, Germany

Abstract

A gas sensor using optical spectrometry and dedicated to a specific gas is studied. It should be able to operate out of laboratories with a very long life and a low maintenance requirement. It is based on TLDS (tunable laser diode spectroscopy) and uses a standard Perot-Fabry laser diode already developed for telecommunications. The mode selection is realized by a passband filter and the wavelength tuning is performed via the diode temperature or its injection current. A PIN photodiode is used for detection, however a rough photoacoustic solution is intended for the future. Absorptions as low as 3.10^-3 are detected with this rough system and a limit detection of 10^-3 is available with a signal to noise ratio of unity. Experiments have shown that this system is strongly selective for the specified gas (currently the methane). A simulation has been performed which very well fits the experiment and allows us to extrapolate the performances of the system for other gases.

Citation Download Citation

Marc Larive and V. Henriot "Near-infrared tunable laser diode spectroscopy: an easy way for gas sensing", Proc. SPIE 3105, Chemical, Biochemical and Environmental Fiber Sensors IX, (30 May 1997); https://doi.org/10.1117/12.276165

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