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Sensors 2017, 17(5), 991; doi:10.3390/s17050991

Humidity Sensor Based on Bragg Gratings Developed on the End Facet of an Optical Fiber by Sputtering of One Single Material

1
Department of Electrical and Electronic Engineering, Public University of Navarra, Pamplona 31006, Spain
2
Institute of Smart Cities, Public University of Navarra, Pamplona 31006, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Gary R. Pickrell
Received: 27 February 2017 / Revised: 25 April 2017 / Accepted: 25 April 2017 / Published: 29 April 2017
(This article belongs to the Special Issue Humidity Sensors)
View Full-Text   |   Download PDF [12942 KB, uploaded 29 April 2017]   |  

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. View Full-Text
Keywords: fiber optics sensors; diffraction gratings; transparent conductive coatings; thin-film; interference coatings; optical fiber humidity sensors fiber optics sensors; diffraction gratings; transparent conductive coatings; thin-film; interference coatings; optical fiber humidity sensors
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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. (CC BY 4.0).

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Ascorbe, J.; Corres, J.M.; Arregui, F.J.; Matias, I.R. Humidity Sensor Based on Bragg Gratings Developed on the End Facet of an Optical Fiber by Sputtering of One Single Material. Sensors 2017, 17, 991.

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