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Fiber optic sensor for chlorinated hydrocarbons in water based on infrared fibers and tunable diode lasers

Sensoren für chlorierte Kohlenwasserstoffe in Wasser mit IR-Fasern und abstimmbaren Diodenlasern
: Krska, R.; Kellner, R.; Schiessl, U.; Tacke, M.; Katzir, A.


Applied Physics Letters 63 (1993), No.14, pp.1-3 : Abb.,Lit.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IPM ()
Fasersensor; fiber sensor; Wasseranalytik; water analysis

A novel fiber optic evanescent wave spectroscopy (FEWS) system is based on a tunable diode laser (TDL) source, on a polymer-coated AgClBr infrared transmitting fiber, and on a mercury cadmium telluride detector. This system was used for sensing low levels of chlorinated hydrocarbons n water. The detection limit was 100 myg/l (100 ppb), which is an improvement by a factor of 50 in comparison to a similar system that is based on a Fourier transform infrared spectrometer, and the measurement time was reduced by a factor of 3. The TDL-FEWS system shows significant potential for in situ monitoring of ground water.