AN EVANESCENT-FIELD FIBER OPTIC SENSOR FOR PH MONITORING IN CIVIL INFRASTRUCTURE
Abstract eng: Fiber optic pH sensors based on the evanescent field spectroscopic technique are studied. Portions of poly-methyl methacrylate (PMMA) cladding of polymer 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, respectively. Changes in the pH of the sensing environment are detected by measuring the absorption spectrum of the new cladding in the sensing region of the optical fiber.
Contributors:
Publisher:
Columbia University in the City of New York
Conference Title:
Conference Title:
15th ASCE Engineering Mechanics Division Conference
Conference Venue:
New York (US)
Conference Dates:
2002-06-02 / 2002-06-05
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
Record appears in:
Record created 2014-11-19, last modified 2014-11-19
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