Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 191, Issue -, Pages 498-507Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.09.072
Keywords
Optical fibre sensor; Fluorescent sensor; pH sensor; High pH values; Corrosion monitoring; Coumarin dye
Funding
- Engineering 82 Physical Sciences Research Council (EPSRC) in the UK
- EPSRC [EP/D030269/1, EP/H029648/1, EP/I006109/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D030269/1, EP/I006109/1, EP/H029648/1] Funding Source: researchfish
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The design, development and evaluation of an optical fibre pH sensor for monitoring pH in the alkaline region are discussed in detail in this paper. The design of this specific pH sensor is based on the pH induced change in fluorescence intensity of a coumarin imidazole dye which is covalently attached to a polymer network and then fixed to the distal end of an optical fibre. The sensor provides a response over a pH range of 10.0-13.2 with an acceptable response rate of around 50 min, having shown a very good stability over a period of longer than 20 months thus far. The sensor has also demonstrated little cross-sensitivity to ionic strength (IS) and also excellent photostability through a series of laboratory tests. These features make this type of sensor potentially well suited for in situ long term monitoring of pH in concrete structures, to enhance structural monitoring in the civil engineering sector. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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