Fiber optic evanescent field sensors for pH monitoring in civil infrastructure

Masoud Ghandehari, Cristian S. Vimer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsA.L. Gyekenyesi, S.M. Shepard, D.R. Huston, A.E. Aktan, P.J. Shull
Pages196-205
Number of pages10
Volume4704
DOIs
StatePublished - 2002
EventNondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures - Newport Beach, CA, United States
Duration: Mar 18 2002Mar 19 2002

Other

OtherNondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures
CountryUnited States
CityNewport Beach, CA
Period3/18/023/19/02

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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  • Cite this

    Ghandehari, M., & Vimer, C. S. (2002). Fiber optic evanescent field sensors for pH monitoring in civil infrastructure. In A. L. Gyekenyesi, S. M. Shepard, D. R. Huston, A. E. Aktan, & P. J. Shull (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4704, pp. 196-205) https://doi.org/10.1117/12.470729