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Proceedings Paper

Miniature Chemical Optical Fiber Sensors For Ph Measurements
Author(s): G. Boisde; J. J. Perez
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Paper Abstract

A miniature optode (diameter about 1 mm) was built with 200/280 all-silica fibers usable over long distances. The immobilized indicator is fixed on a cross-linked styrene/divinyl-benzene copolymer (XADZI). The sensors are constructed so that measurements can be taken either by absorption at many different points in the single optical fiber, or by reflection from the end of the fiber. A wide range of pH values are encountered with radioactive wastes, and experiments are performed either with bromophenol blue (3.0 to 6.0) or a double-indicator (thymol blue) between 0.8 and 3.2, and 9 and 13 pH, as well as other indicators. Lifetimes, reversibility and kinetics are considered. A new low-cost device is proposed for chemical process control and medical applications.

Paper Details

Date Published: 14 October 1987
PDF: 8 pages
Proc. SPIE 0798, Fiber Optic Sensors II, (14 October 1987); doi: 10.1117/12.941112
Show Author Affiliations
G. Boisde, C.E.A. (France)
J. J. Perez, C.E.A. (France)

Published in SPIE Proceedings Vol. 0798:
Fiber Optic Sensors II
Anna Maria Verga Scheggi, Editor(s)

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