Fiber optic pH sensor with dye-doped multilayer sol-gel coatings

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

doi:10.1117/12.441350

25 September 2001 Fiber optic pH sensor with dye-doped multilayer sol-gel coatings

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

Author Affiliations +

Proceedings Volume 4417, Photonics 2000: International Conference on Fiber Optics and Photonics; (2001) https://doi.org/10.1117/12.441350
Event: Photonics 2000: International Conference on Fiber Optics and Photonics, 2001, Calcutta, India

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.

Citation Download Citation

S. Thomas Lee, Gin Jose, C. M. Manju, Betty Joseph, M. Shelly John, Periasamy Radhakrishnan, V. P. N. Nampoori, C. P. G. Vallabhan, and N. V. Unnikrishnan "Fiber optic pH sensor with dye-doped multilayer sol-gel coatings", Proc. SPIE 4417, Photonics 2000: International Conference on Fiber Optics and Photonics, (25 September 2001); https://doi.org/10.1117/12.441350

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