Publication:
Humidity sensor based on Bragg gratings developed on the end facet of an optical fiber by sputtering of one single material

Date

2017

Director

Publisher

MDPI
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión publicada / Argitaratu den bertsioa

Project identifier

ES/1PE/TEC2016-79367

Abstract

The refractive index of sputtered indium oxide nanocoatings has been altered just by changing the sputtering parameters, such as pressure. These induced changes have been exploited for the generation of a grating on the end facet of an optical fiber towards the development of wavelength-modulated optical fiber humidity sensors. A theoretical analysis has also been performed in order to study the different parameters involved in the fabrication of this optical structure and how they would affect the sensitivity of these devices. Experimental and theoretical results are in good agreement. A sensitivity of 150 pm/%RH was obtained for relative humidity changes from 20% to 60%. This kind of humidity sensors shows a maximum hysteresis of 1.3% relative humidity.

Description

Keywords

Fiber optics sensors, Diffraction gratings, Transparent conductive coatings, Thin-film, Interference coatings, Optical fiber humidity sensors

Department

Ingeniaritza Elektrikoa eta Elektronikoa / Institute of Smart Cities - ISC / Ingeniería Eléctrica y Electrónica

Faculty/School

Degree

Doctorate program

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© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.

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