14 October 1987 Fibre-Optic Ph Sensor For Seawater Monitoring
Author Affiliations +
Proceedings Volume 0798, Fiber Optic Sensors II; (1987) https://doi.org/10.1117/12.941123
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands
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.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M MonicI, M MonicI, R. Roniforti, R. Roniforti, G. Buzziyoli, G. Buzziyoli, B . De Rossi, B . De Rossi, A. Nannini, A. Nannini, } "Fibre-Optic Ph Sensor For Seawater Monitoring", Proc. SPIE 0798, Fiber Optic Sensors II, (14 October 1987); doi: 10.1117/12.941123; https://doi.org/10.1117/12.941123

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