IR LASER PHOTOTHERMAL TRACE GAS DETECTION APPLIED TO ENVIRONMENTAL AND BIOLOGICAL PROBLEMS - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Inl'rared Phys. Technol Année : 1995

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

Hugo de Vries
M R van Lieshout
  • Fonction : Auteur
F J M Harren
  • Fonction : Auteur
J Reuss
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-02934585 , version 1 (09-09-2020)

Identifiants

Citer

Hugo de Vries, M R van Lieshout, F J M 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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