18 June 2002 Fiber optic evanescent field sensors for pH monitoring in civil infrastructure
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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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Masoud Ghandehari, Masoud Ghandehari, Cristian S. Vimer, Cristian S. Vimer, "Fiber optic evanescent field sensors for pH monitoring in civil infrastructure", Proc. SPIE 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures, (18 June 2002); doi: 10.1117/12.470729; https://doi.org/10.1117/12.470729

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