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Proceedings Paper

Optical fiber sensor for the measurement of the pH level using organic dyes deposited by the sol-gel process
Author(s): Juan Pablo Padilla Martínez; Imelda Santiago Núñez; Georgina Beltrán Pérez; Juan Castillo Mixcóatl; Severino Muñoz Aguirre; Rodolfo Palomino Merino
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Paper Abstract

Some pH sensors based on optical fibers use organic dyes which are sensitive to the pH levels. Such dyes are deposited over the fiber and they are supported by a matrix, (TiO2) in this case. In this work, we present the results obtained of the fabrication and characterization of an optical fibers sensor with a thin film doped with two different organics dyes (Rhodamine 6G and Coumarin), deposited in a little section of the optical fiber by the SOL - GEL process. It was found that each dye is sensitive to different pH ranges (2 to 12). The fiber optics sensor can be used for the measured of the pH level of aqueous testing solution, and the combination of the dyes is possible to cover a dynamic ranges from 2 to 12. It is also analyzed the sensitivity of the sensor with the Rhodamine 6G and Coumarin dye for different molar concentrations in a range 0.01% to 0.08% and to determine this way the best concentration for the sensor.

Paper Details

Date Published: 19 May 2007
PDF: 7 pages
Proc. SPIE 6422, Sixth Symposium Optics in Industry, 64220Z (19 May 2007); doi: 10.1117/12.742279
Show Author Affiliations
Juan Pablo Padilla Martínez, Benemérita Univ. Autónoma de Puebla (Mexico)
Imelda Santiago Núñez, Benemérita Univ. Autónoma de Puebla (Mexico)
Georgina Beltrán Pérez, Benemérita Univ. Autónoma de Puebla (Mexico)
Juan Castillo Mixcóatl, Benemérita Univ. Autónoma de Puebla (Mexico)
Severino Muñoz Aguirre, Benemérita Univ. Autónoma de Puebla (Mexico)
Rodolfo Palomino Merino, Benemérita Univ. Autónoma de Puebla (Mexico)


Published in SPIE Proceedings Vol. 6422:
Sixth Symposium Optics in Industry

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