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IR LASER PHOTOTHERMAL TRACE GAS DETECTION APPLIED TO ENVIRONMENTAL AND BIOLOGICAL PROBLEMS

Abstract : A~tract-The photothermal effect is utilized for the detection of molecular trace gases in the open air, with high spatial and temporal resolution. An IR CO 2 laser is used to excite specific molecules to higher vibrational levels. The subsequent change in temperature and refractive index is monitored by the deflection of a HeNe laser beam which crosses the CO 2 laser beam. To improve the detection limit of the system the CO, laser has an intracavity focus near to which the HeNe laser passes 31 times in a multipass mirror setup. A detection sensitivity of I ppbv (C2H4) and 0.5 ppbv (NH3) is achieved under practical conditions.
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https://hal.inrae.fr/hal-02934585
Contributor : Hugo de Vries <>
Submitted on : Wednesday, September 9, 2020 - 2:45:24 PM
Last modification on : Tuesday, November 24, 2020 - 11:49:06 AM

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Hugo de Vries, M van Lieshout, F Harren, J Reuss. IR LASER PHOTOTHERMAL TRACE GAS DETECTION APPLIED TO ENVIRONMENTAL AND BIOLOGICAL PROBLEMS. Inl'rared Phys. Technol, 1995, 36, ⟨10.1016/1350-4495(94)00087-2⟩. ⟨hal-02934585⟩

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