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Journal of Sensors
Volume 2009, Article ID 815409, 4 pages
Research Article

Fiber-Optic Aqueous Dipping Sensor Based on Coaxial-Michelson Modal Interferometers

1Instituto de Investigación en Comunicación Óptica (IICO), Universidad Autónoma de San Luis Potosí, Av. Karakorum 1470, 78210 San Luis Potosí, Mexico
2Departamento de Física Aplicada-ICMUV, Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Spain

Received 1 February 2009; Accepted 9 July 2009

Academic Editor: Valerio Pruneri

Copyright © 2009 Paola Barrios et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Fiber-optic modal interferometers with a coaxial-Michelson configuration can be used to monitor aqueous solutions by simple dipping of few centimeters of a fiber tip. The fabrication of these sensors to work around 850 nm enables the use of compact, robust, and low-cost optical spectrum analyzers. The use of this type of portable sensor system to monitor sewage treatment plants is shown.