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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    Title :

    Fiber optic evanescent field sensors for pH monitoring in civil infrastructure


    Contributors:

    Conference:

    Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures ; 2002 ; San Diego,California,United States


    Published in:

    Publication date :

    2002-06-18





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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