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Advances in Materials Science and Engineering
Volume 2014, Article ID 405250, 8 pages
Research Article

Influence of Humidity on Fiber Bragg Grating Sensors

1Aeronautical Technologies Center (CTA), C/Juan de la Cierva, No.1 Parque Tecnológico de Álava, Miñano, 01510 Álava, Spain
2Department of Communications Engineering, Faculty of Engineering, University of the Basque Country (UPV/EHU), C/Alda. Urquijo S/N, 48013 Bilbao, Spain

Received 5 September 2013; Revised 18 November 2013; Accepted 19 November 2013; Published 22 January 2014

Academic Editor: Xinyong Dong

Copyright © 2014 Ander Montero 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.


We demonstrate the influence of the relative humidity (RH) on the wavelength of fiber Bragg grating sensors (FBGS), performing tests with five FBGS at different humidity and temperature conditions. These tests were performed in a climate chamber whose RH changes according to a scheduled profile from 30% to 90%, in steps of 10%. These profiles were repeated for a wide range of temperatures from to , in steps of . Two different types of instrumentation methods have been tested, spot welding and epoxy bonding, in two different materials, steel and carbon fiber reinforced polymer (CFRP). We discuss the results for each type of sensor and instrumentation method by analyzing the linearity of the Bragg wavelength with RH and temperature.