✦ LIBER ✦

Infrared fiber optic gas sensor for chlorofluorohydrocarbons

✍ Scribed by B. Mizaikoff; K. Taga; R. Kellner

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 355 KB
Volume: 8
Category: Article
ISSN: 0924-2031
DOI: 10.1016/0924-2031(94)00077-t

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✦ Synopsis

In this paper the detection of several gaseous species of chlorofluorohydrocarbons such as 1,2-dichlorotetrafluoroethane (R 114) or trifluoromethane (R 23) using the fiber optic evanescent field absorption spectroscopy is presented. By coupling mid-infrared transparent silver halide fibers to a conventional Fourier transform infrared spectrometer reasonable results could be obtained in the concentration range of 1-15% of the gas species diluted in synthetic air using a gas sensing device exploiting uncoated fibers. As shown for the example R 114 the enrichment of the analyte in a polymer layer (low-density polyethylene, polyisobutylene) coating the fiber lowered the detection limit to 0.1%.

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