Fiber-Optic-Based Evanescent Field Infrared Spectroscopy Using Tunable Diode Lasers

2 June 1989

proceedings article
Published by SPIE-Intl Soc Optical Eng

Vol. 1048, 133-141
https://doi.org/10.1117/12.951393

Abstract

A simple fiber-optic chemical sensor which may be used to detect in-situ and in real time concentrations and chemical transformation of liquids and pastes is reported. The sensor, comprised of a tunable IR diode laser source and a cladding-free multimode IR fiber, operates on the principle of evanescent field absorption spectroscopy. The sensor's response is theoretically analyzed and experimentally verified.

Keywords

SENSORS
FIBER OPTICS
INFRARED SPECTROSCOPY
FIBER OPTIC
SEMICONDUCTOR LASERS
TUNABLE DIODE LASER
CHEMICALS
ABSORPTION SPECTROSCOPY
CLADDING

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