Comparative study of multimode CYTOP graded index and single-mode silica fibre Bragg grating array for the mode shape capturing of a free-free metal beam

A. Theodosiou; M. Polis; A. Lacraz; K. Kalli; M. Komodromos; A. Stassis

doi:10.1117/12.2230792

28 April 2016 Comparative study of multimode CYTOP graded index and single-mode silica fibre Bragg grating array for the mode shape capturing of a free-free metal beam

A. Theodosiou, M. Polis, A. Lacraz, K. Kalli, M. Komodromos, A. Stassis

Author Affiliations +

Proceedings Volume 9886, Micro-Structured and Specialty Optical Fibres IV; 98860O (2016) https://doi.org/10.1117/12.2230792
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

The work described in this paper involved two different material fibre Bragg grating (FBG) arrays, investigating their performance as quasi-distributed sensors by capturing the vibrating response of a free-free metal beam close to its resonance frequencies. A six meter length of low-loss, gradient-index, multimode CYTOP fibre and of SMF-28 were used for the inscription of multiple FBG sensors using a femtosecond laser inscription method. The FBG arrays were multiplexed in the wavelength domain using a high-speed commercial demodulator, from which we recovered wavelengthand time-dependent displacement information. We compared the vibration response of the two arrays and using a novel computation algorithm we extract the first mode shape of the free-free metal beam that was exited at its first resonance frequency using a vibrating force.

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A. Theodosiou, M. Polis, A. Lacraz, K. Kalli, M. Komodromos, and A. Stassis "Comparative study of multimode CYTOP graded index and single-mode silica fibre Bragg grating array for the mode shape capturing of a free-free metal beam", Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, 98860O (28 April 2016); https://doi.org/10.1117/12.2230792

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