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Proceedings Paper

Fiber optic pH sensor with dye-doped multilayer sol-gel coatings
Author(s): S. Thomas Lee; Gin Jose; C. M. Manju; Betty Joseph; M. Shelly John; Periasamy Radhakrishnan; V. P. N. Nampoori; C. P. G. Vallabhan; N. V. Unnikrishnan
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Paper Abstract

The design and fabrication of a fiber optic pH sensor working on the basis of evanescent wave absorption is presented. A pH sensitive dye is immobilized on the uncladed portion of the optic fiber by sol-gel route. The sensitivity of the device is found to increase when multiple sol-gel coatings are used as the cladding in the sensing region. The sensor response and its dynamic range are reported for two pH indicator dyes, viz. bromocresol purple and bromocresol green.

Paper Details

Date Published: 25 September 2001
PDF: 9 pages
Proc. SPIE 4417, Photonics 2000: International Conference on Fiber Optics and Photonics, (25 September 2001); doi: 10.1117/12.441350
Show Author Affiliations
S. Thomas Lee, Cochin Univ. of Science and Technology (India)
Gin Jose, Mahatama Gandhi Univ. (India)
C. M. Manju, Mahatama Gandhi Univ. (India)
Betty Joseph, Mahatama Gandhi Univ. (India)
M. Shelly John, Cochin Univ. of Science and Technology (Singapore)
Periasamy Radhakrishnan, Cochin Univ. of Science and Technology (India)
V. P. N. Nampoori, Cochin Univ. of Science and Technology (India)
C. P. G. Vallabhan, Cochin Univ. of Science and Technology (India)
N. V. Unnikrishnan, Mahatma Gandhi Univ. (India)


Published in SPIE Proceedings Vol. 4417:
Photonics 2000: International Conference on Fiber Optics and Photonics
S. K. Lahiri; Ranjan Gangopadhyay; Asit K. Datta; Samit K. Ray; B. K. Mathur; S. Das, Editor(s)

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