Journal
POLYMERS
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/polym10060674
Keywords
polymer optical fiber; fiber Bragg gratings; CYTOP; curvature sensor; hysteresis
Categories
Funding
- FCT [SFRH/BPD/109458/2015]
- Fundacao para a Ciencia e a Tecnologia/Ministerio da Educacao e Ciencia [UID/EEA/50008/2013]
- European Regional Development Fund
- CAPES [88887.095626/2015-01]
- FAPES [72982608]
- CNPq [304192/2016-3, 310310/2015-6]
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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 degrees 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.
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