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

R. Krska*, R. Kellner, U. Schiessl, M. Tacke, A. Katzir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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 in water. The detection limit was 100 μg/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.

Original languageEnglish
Pages (from-to)1868-1870
Number of pages3
JournalApplied Physics Letters
Volume63
Issue number14
DOIs
StatePublished - 1993

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