Fiber optic evanescent field sensors for pH monitoring in civil infrastructure

Masoud Ghandehari; Cristian S. Vimer

doi:10.1117/12.470729

18 June 2002 Fiber optic evanescent field sensors for pH monitoring in civil infrastructure

Proceedings Volume 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures; (2002) https://doi.org/10.1117/12.470729
Event: NDE For Health Monitoring and Diagnostics, 2002, San Diego, California, United States

Abstract

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.

Citation Download Citation

Masoud Ghandehari and 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); https://doi.org/10.1117/12.470729

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