Evanescent wave absorption based fiber optic pH sensor prepared by dye doped sol-gel immobilization technique

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Date
1997
Authors
Gupta, B D
Sharma, D K
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Abstract
A fiber optic pH sensor based on evanescent wave absorption is presented. To prepare the probe a small length of the cladding is removed from the middle portion of the fiber. A thin porous film of glass with pH-sensitive dye entrapped in it is deposited on the surface of the unclad portion of the fiber using sol-gel technology. The sensor response and its dynamic range are reported for phenol red, cresol red and bromophenol blue dyes. The sol-gel process has been found to increase the dynamic range of the pH sensor.
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Keywords
Fiber optics, Sensor, Evanescent wave, Absorption, pH, Sol-gel process
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