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Fiber-optic pH sensor for in situ applications

✍ Scribed by S. Motellier; M.H. Michels; B. Duréault; P. Toulhoat

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
560 KB
Volume
11
Category
Article
ISSN
0925-4005

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✦ Synopsis

An evaluation of the feasibility of a fiber-optic pH sensor has been carried out. The pH sensor is composed of an optode connected to the transmitter-receiver apparatus (Optolec H) through a 1OOm long fiber. Three diodes of carefully chosen wavelengths are located in the Opt&c H and emit through a bundle of nine fibers to the end of the optode, where the oncoming light is reflected on an immobilized pH-indicator-based spherical bead of resin and sent back for analysis to the Optolec H through a central fiber. The influences of ionic strength as well as precision, response time, and lifetime have been determined. This device is to be used for routine in situ measurements in an underground laboratory devoted to studies in comxction with nuclear waste repositories, where harsh conditions are encountered for direct collection of waters and traditional post-determination with a pH meter.

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