P2.3.16 yFibre optic pH sensor for Corrosion Monitoring in Concrete Structures
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P2.3 Sensors Based on Optical Techniques
- T. Nguyen, T. Venugopala, S. Chen, T. Sun, K. Grattan - School of Engineering and Mathematical Sciences, City University London (UK), S. Taylor, P. Basheer, A. Long - School of Planning, Architecture and Civil Engineering, Queen's University Belfast (UK)
- 1493 - 1496
The development of a fluorescence-based optical fibre pH sensor designed specifically for monitoring the high pH condition of concrete utilizing a novel pH sensitive fluorescent polymer is discussed in this paper. The sensor provides a response over the required pH range for concrete monitoring of 10.0 - 13.2, 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 excellent photostability in a series of laboratory tests carried out. These features make this type of sensor potentially well suited for the conditions required for long term in-situ monitoring of pH in concrete structures.