Optical fiber sensors for challenging media. Sensores de fibra ?tica para meios desafiantes

      Аннотация: With the present book, the development of fiber optic sensor solutions for the application in challenging media was presented. New sensor structures based on the post-processing of optical fibers were addressed, taking into account their sensitivity to variations in the external environment. In a first stage, fiber Bragg gratings were embedded in lithium batteries, to monitor temperature in situ and operando. Still in the framework of this theme, and with the objective of monitoring possible strain and pressure variations inside the batteries, new sensors based on in-line Fabry-Perot cavities have been proposed. In a later stage, the study focused on the development of configurations that allowed to obtain high-resolution and/or sensitivity sensors. The sensor was used to detected concentration variations and refractive index of glycerin and water mixtures. New sensors based on multimode interference have also been characterized, using a coreless silica fiber tip and finally, a multimode interferometer sensor was functionalized by depositing agarose throughout the structure, allowing to optimize the response of the sensors to the external environment.

Ключевые слова: Optical fiber sensors, Fabry-Perot, Interferometry, post-processing, etching, Lithium batteries, chemical sensors, Functionalization