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Proceedings Paper

Fiber optic evanescent field sensors for pH monitoring in civil infrastructure
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Paper 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.

Paper Details

Date Published: 18 June 2002
PDF: 10 pages
Proc. SPIE 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures, (18 June 2002); doi: 10.1117/12.470729
Show Author Affiliations
Masoud Ghandehari, Polytechnic Univ. (United States)
Cristian S. Vimer, Polytechnic Univ. (United States)


Published in SPIE Proceedings Vol. 4704:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures
Andrew L. Gyekenyesi; Steven M. Shepard; Dryver R. Huston; A. Emin Aktan; Peter J. Shull, Editor(s)

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