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Fluorescence based fibre optic pH sensor for the pH 10-13 range suitable for corrosion monitoring in concrete structures

Nguyen, T.H., Venugopala, T., Chen, S. , Sun, T., Grattan, K. T. V., Taylor, S.E., Basheer, P.A.M. & Long, A.E. (2014). Fluorescence based fibre optic pH sensor for the pH 10-13 range suitable for corrosion monitoring in concrete structures. Sensors and Actuators, B: Chemical, 191, pp. 498-507. doi: 10.1016/j.snb.2013.09.072


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 minutes, 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.

Publication Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Sensors and Actuators B: Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators B: Chemical 191 (2014) DOI: 10.1016/j.snb.2013.09.072
Publisher Keywords: Optical fibre sensor, fluorescent sensor, pH sensor, high pH values, corrosion monitoring, coumarin dye
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Science & Technology > Engineering
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