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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/1771

Title: A sensitive fibre optic pH sensor using multiple sol–gel coatings
Authors: V P N Nampoori
Radhakrishnan, P
Girijavallabhan, C P
Thomas Lee, S
Jose, Gin
Unnikrishnan, N V
Keywords: Fibre optics
optical fibre
evanescent wave
sensor
pH
sol–gel
absorption
multi-layer
Issue Date: 12-Jul-2001
Publisher: Journal of Optics A: Pure and Applied Optics
Citation: International School of Photonics, Cochin University of Science and Technology
Abstract: The fabrication and characterization of a fibre optic pH sensor based on evanescent wave absorption is presented. The unclad portion of a multi-mode optical fibre is coated with a pH sensitive dye, which is immobilized by the sol–gel route. The sensitivity of the device has been found to increase when multiple sol–gel coatings are used as the sensing region. The dynamic range and the temporal response of the sensor are investigated for two different dyes, namely bromocresol purple and bromocresol green. The performance of the device is evaluated in terms of the results obtained during actual measurements.
URI: http://dyuthi.cusat.ac.in/purl/1771
Appears in Collections:Dr. V P N Nampoori

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