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Proceedings Paper

Fibre-Optic Ph Sensor For Seawater Monitoring
Author(s): M MonicI; R. Roniforti; G. Buzziyoli; B . De Rossi; A. Nannini
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Paper Abstract

A sensor for continuous monitoring of pH in seawater is presented. It is based on the conversion of the yellow (reduced) form of the indicator phenol red into the red (oxidized) form. The instrument is implemented using fibre-optic technology. The probe consists of a cell, containing the dye immobilized on a cross-linked styrene-divinylbenzene polymer Rotrix, placed on the tip of the optical fibre. The working range of the sensor is included within these bounds: 6< pH <9; 20.2e/bo<sai inity 35.2%4 5°C temperature 30°C. The design of the probes takes into account the influQnce of ionic strength and temperature and provisions are adopted to compensate for' their changes in working ranges specified above.

Paper Details

Date Published: 14 October 1987
PDF: 7 pages
Proc. SPIE 0798, Fiber Optic Sensors II, (14 October 1987); doi: 10.1117/12.941123
Show Author Affiliations
M MonicI, University of Pisa (Italy)
R. Roniforti, Centro Energia e Ambient (Italy)
G. Buzziyoli, Istituto di Fisiologia Clinica del C.N.R. (Italy)
B . De Rossi, University of Pisa (Italy)
A. Nannini, University of Pisa (Italy)

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

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