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

T. Hien Nguyen, Thillainathan Venugopala, Shuying Chen, Tong Sun, Kenneth T.V. Grattan, Susan E. Taylor, P.A. Muhammed Basheer, Adrian E. Long

    Research output: Contribution to journalArticle

    69 Citations (Scopus)

    Abstract

    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
    Original languageEnglish
    Pages (from-to)498–507
    Number of pages10
    JournalSENSORS AND ACTUATORS B-CHEMICAL
    Volume191
    Early online date23 Sep 2013
    DOIs
    Publication statusPublished - Feb 2014

    Keywords

    • Optical fibre sensor; Fluorescent sensor; pH sensor; High pH values; Corrosion monitoring; Coumarin dye

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