Fiber-optic evanescent wave spectroscopy in the middle infrared

Y. Raichlin*, A. Katzir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Fiber-optic evanescent wave spectroscopy (FEWS) in the mid-infrared region is a powerful tool for the study and analysis of solids, liquids, and gases, and of various mixtures of solids, liquids, and gases. The penetration depth of the evanescent field into the sample is small and the sensitivity of the sensor is limited, when a straight and uniform cylindrical optical fiber serves as a sensor. The FEWS technique based on silver halide optical fibers can be a useful tool for the detection of gases dissolved in liquids. FEWS may be used for the analysis of large samples, as well as the analysis of powders, and even of one small solid particle. FEWS measurement using the remote sensor system makes it possible to carry out real-time measurements on samples that are remote from the FTIR systems. FEWS method is also ideally suited for the study of time-dependent phenomena. Sedimentation fiber-optic evanescent wave spectroscopy (SFEWS) is a new method, which makes it possible to carry out measurements on living biological cells.

Original languageEnglish
Pages (from-to)55A-72A
JournalApplied Spectroscopy
Volume62
Issue number2
DOIs
StatePublished - Feb 2008

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