Abstract

A fiber-optic sensor for the measurement of chemical species are very interested since it offers new application which is not given by conventional pH electrodes (1). Fluorimetry is most suitable in application to a fiber-optic sensor because of its high sensitivity. Various types of sensors based on fluorimetry have been developed for measurements of pH (2), O₂ (3), and metal ions (4). In these sensors the chemical reagents are immobilized on a membrane, which is attached on an end surface of a bifurcated fiber-optic bundle. This type of sensors gives small background emission due to scattering of an exciting source, but it sometimes suffers from its slow response time to an analyte and from poor mechanical stability.

© 1986 Optical Society of America