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IR laser photothermal trace gas detection applied to environmental and biological problems by H.S.M. de Vries; M.R. van Lieshout; F.J.M. Harren; J. Reuss is a Engineering article available to read on EtoBox.

What is IR laser photothermal trace gas detection applied to environmental and biological problems about?

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.

Who reads IR laser photothermal trace gas detection applied to environmental and biological problems?

Author

H.S.M. de Vries; M.R. van Lieshout; F.J.M. Harren; J. Reuss

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1350-4495)

Published

1995

Language

EN

Field

Engineering (Physical Sciences)