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Polymer Optical Fiber Bragg Gratings in CYTOP Fibers for Angle Measurement with Dynamic Compensation

LEAL-JUNIOR, A. ; Theodosiou, A. ; Rodriguez, C. ; Marques, C. ; Pontes, M. J. ; Kalli, K. ; Frizera-Neto, A. Frizera-Neto

Polymers Vol. 10, Nº 6, pp. 674-1 - 674-16, June, 2018.

ISSN (print): 2073-4360
ISSN (online):

Journal Impact Factor: 3,364 (in )

Digital Object Identifier: 10.3390/polym10060674

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.