Fiber-optic aqueous dipping sensor based on coaxial-Michelson modal interferometers

Abstract

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 850nm 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. Copyright © 2009 Paola Barrios et al.