Evanescent field IR spectroscopy using optical fibres and tunable diode lasers

I. Schnitzer*, A. Katzir, U. Schiessl, W. J. Riedel, M. Tacke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A new technique for IR spectroscopic measurements of liquids, pastes and thin films is reported. The technique is based on the evanescent field absorption occurring when the material forming the cladding of a waveguide absorbs light at the wavelength being transmitted. The spectroscopic system, consisting of an IR tunable diode laser source and an unclad multimode IR fibre, is described. Design considerations, theoretical predictions and experimental verification of the sensor performance are presented. This sensor has a relatively high sensitivity, and it will be very useful for monitoring and controlling concentrations and chemical transformations of liquids and pastes in situ and in real time.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Issue number2
StatePublished - Jan 1990


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