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Title: Modified fs-Laser Inscribed FBG Array for Rapid Mode Shape Capture of Free-Free Vibrating Beams
Authors: Theodosiou, Antreas 
Lacraz, Amédéé 
Polis, Michael 
Kalli, Kyriacos 
Tsangari, Maria 
Stassis, Andreas 
Komodromos, Michael 
Keywords: Bragg grating sensors
Surface displacement sampling
Femtosecond laser
Optical fiber sensors
Shape sensing
Issue Date: 15-Jul-2016
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source: IEEE Photonics Technology Letters, 2016, Volume 28, Issue 14, Article number 7458831, Pages 1509-1512
Abstract: We report on the development of a multiplexed sensor array of fiber Bragg gratings (FBGs), inscribed using a femtosecond laser, and its demonstration as a quasi-distributed sensor to capture the mode shapes, through surface displacement sampling, of a free-free vibrating beam. Our method is based on a plane-by-plane inscription approach, whereby a 2-D index change is written across the fiber core, controlling the width and depth of the modified region. This allows for the fast inscription of multiple wavelength FBGs in coated optical fibers, with the advantage of less stringent alignment requirements. The FBGs are multiplexed in the wavelength domain using a high-speed demodulator, using a fast, custom-made computational algorithm. We recover rapid and single-step wavelength- and time-dependent displacement information, extracting the first two mode shapes of a vibrating beam and their respective degrees of freedom resonance frequencies in <0.4 s.
ISSN: 10411135
Rights: © 2016 IEEE.
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