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Proceedings Paper

pH sensor based on sol-gel silica layer deposited on a plastic optical fiber with blue bromophenol
Author(s): Edgar Alvarado-Méndez; Daniel Hernández-Cruz; Roberto Rojas-Laguna; Jose Amparo Andrade-Lucio; Julian M. Estudillo-Ayala; M. Trejo-Durán; Oscar G. Ibarra-Manzano; J. Erasmo Ponce-Ballesteros; Roger A. Lessard
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Paper Abstract

Design and characterization of a pH optical fiber sensor with a pH sensitive dye is described in this paper. TEOS (Tetra-ethyl-Orto-Silicate) was used to dope a plastic optical fiber, which will be used as the probe. The sensor is prepared by fixing the doped plastic fiber on a fused ortosilica block surface with blue bromophenol. The fiber surface charged with silica and the refractive index, which plays an important roll on the fiber, modifies the conditions of light propagation into the plastic optical fiber. The fiber transmittance is used to measure the pH of a solution or a fluid in a range between 7 and 10.5. Such signal is captured by a photodetector and processed with a LabView development environment which also controls a hardware designed in our laboratory. The advantage of this system is that 2cm of doped fiber are enough to measure the pH of a fluid in real time. The response time of this system is approximately 10s.

Paper Details

Date Published: 16 November 2004
PDF: 9 pages
Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.567117
Show Author Affiliations
Edgar Alvarado-Méndez, Univ. de Guanajuato (Mexico)
Daniel Hernández-Cruz, COPL, Univ. Laval (Canada)
Roberto Rojas-Laguna, Univ. de Guanajuato (Mexico)
Jose Amparo Andrade-Lucio, Univ. de Guanajuato (Mexico)
Julian M. Estudillo-Ayala, Univ. de Guanajuato (Mexico)
M. Trejo-Durán, Univ. de Guanajuato (Mexico)
Oscar G. Ibarra-Manzano, Univ. de Guanajuato (Mexico)
J. Erasmo Ponce-Ballesteros, Univ. of Guanajuato (Mexico)
Roger A. Lessard, COPL, Univ. Laval (Canada)

Published in SPIE Proceedings Vol. 5579:
Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers
Donna Strickland; Trevor J. Hall; Stoyan Tanev; Xiaoyi Bao; Franko Kueppers; David V. Plant, Editor(s)

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