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Title: Polymer optical fiber Bragg Gratings in CYTOP Fibers for angle measurement with dynamic compensation
Authors: Leal-Junior, Arnaldo 
Theodosiou, Antreas 
Díaz, Camilo 
Marques, Carlos 
Pontes, Maria José 
Kalli, Kyriacos 
Frizera-Neto, Anselmo 
Keywords: Polymer optical fiber;Fiber Bragg gratings;CYTOP;Curvature sensor;Hysteresis
Category: Materials Engineering
Field: Engineering and Technology
Issue Date: 17-Jun-2018
Publisher: MDPI AG
Source: Polymers, 2018, vol. 10, no. 6, Article no. 674
Journal: Polymers 
Abstract: This paper demonstrates the use of polymer optical fiber Bragg gratings (POFBGs) for angle measurements over a range of different oscillatory frequencies. The POFBGs are inscribed in low-loss, cyclic transparent amorphous fluoropolymers (CYTOP) and are imprinted using the direct-write, plane-by-plane femtosecond laser inscription method. As the polymer has a viscoelastic response and given that the Young’s modulus depends on the oscillatory frequency, a compensation technique for sensor frequency cross-sensitivity and hysteresis is proposed and verified. Results show that the proposed compensation technique is able to provide a root mean squared error (RMSE) reduction of 44%, and a RMSE as low as 2.20° was obtained when compared with a reference potentiometer. The hysteresis reduction provided by the proposed technique is 55%, with hysteresis <0.01. The results presented in this paper can pave the way for movement analysis with POFBG providing higher sensitivity and low hysteresis over a large range of motion frequencies.
ISSN: 2073-4360
DOI: 10.3390/polym10060674
Rights: © 2018 by the authors.
Type: Article
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