Results of research on real-time distributed monitoring of agents and products of materials deterioration will be presented. The potential of integration of functional polymers and optical wave-guides as tools for monitoring materials chemistries will be discussed. In such hybrid sensing systems, analyte recognition is carried out through the selection process inherent in the fiber optic poro-selective cladding materials, while transduction is carried out by the guided evanescent field which is spectrally modulated according to the level of the target analyte species present.
Fiber optic pH sensors based on the evanescent field spectroscopic technique is studied. Portions of poly (-methyl methacrylate) (PMMA) cladding of plastic clad silica (PCS) optical fibers are replaced with new cladding composed of PMMA doped with a pH sensitive chromophore. Methyl Red, Thymol Blue, Thymolphtalein are used for sensing pH at the acid, neutral and base levels. Changes in the pH of the analyte are detected by measuring the absorption spectrum of the new cladding in the sensing region of the optical fiber.
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