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Title: Simultaneous Measurement of Humidity and Temperature Based on an SiO2-Nanospheres Film Deposited on a Long-Period Grating In-Line With a Fiber Bragg Grating
Authors: Francisco Arregui
José Luís Santos
Francisco Araújo
Ignacio Matias
Diana Viegas
Miguel Hernaez
Javier Goicoechea
Issue Date: 2011
Abstract: A novel configuration able to measure simultaneously relative humidity and temperature is proposed. The sensing head is based on a long-period fiber grating (LPG) coated with silica nanospheres in-line with a fiber Bragg grating. The polymeric overlay that changes its optical properties when exposed to different humidity levels is deposited onto the LPG using the electrostatic self-assembly technique (ESA), resulting into a humidity-induced shift of the resonance wavelength of the LPG. Considering the humidity range from 20% to 50% RH, a system resolution of 1.6% RH and 2.5 C was achieved. At higher humidity, from 50% to 80% RH, the corresponding resolution values were 2.4% RH and 0.4 C.
metadata.dc.type: article
Appears in Collections:CAP - Articles in International Journals

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