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Title: FPI-POFBG Angular Movement Sensor Inscribed in CYTOP Fibers with Dynamic Angle Compensator
Authors: Leal-Junior, Arnaldo G. 
Theodosiou, Antreas 
Díaz, Camilo A. R. 
Avellar, Letícia M. 
Kalli, Kyriacos 
Marques, Carlos Alberto F. 
Frizera, Anselmo 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Fabry-Perot interferometers;Fiber Bragg gratings;Movement analysis;Polymer optical fiber;Viscoelasticity
Issue Date: 1-Jun-2020
Source: IEEE Sensors Journal, 2020, vol. 20, no. 11, pp. 5962-5969
Volume: 20
Issue: 11
Start page: 5962
End page: 5969
Journal: IEEE Sensors Journal 
Abstract: We present the development and application of an angular movement sensor based on Fabry-Perot interferometer (FPI) in series with a fiber Bragg grating (FBG) inscribed in cyclic transparent optical polymer (CYTOP) using a femtosecond laser. The FPI was fabricated with UV-curable resin between the CYTOP and a silica pigtail, which provides flexibility and the possibility in situ fabrication. In this case, the FPI is an edge-filter for the FBG response, which presents both wavelength shift and optical power attenuation as the bending angle increases. A dynamic compensator for the material's viscoelastic response resulted in a six-fold reduction in the sensor's transient response error. The FPI-POFBG angular movement sensor was validated in knee angle monitoring during gait cycles, where the sensor presented errors as low as 2.5°. This is a low-cost sensor with high flexibility on fabrication and with the capacity of following subtle angle variations, as the ones commonly occurred in gait cycles.
ISSN: 1558-1748
DOI: 10.1109/JSEN.2020.2974931
Rights: © IEEE.
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Federal University of Espírito Santo 
Cyprus University of Technology 
University of Aveiro 
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