6 January 2015 Optical fiber sensors for measurement strain and vibration
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Proceedings Volume 9450, Photonics, Devices, and Systems VI; 94500G (2015) https://doi.org/10.1117/12.2070480
Event: Photonics Prague 2014, 2014, Prague, Czech Republic
Abstract
We present optical fiber sensors to measurement strain and vibration. The sensors are based on fiber Bragg gratings (FBG). We prepared construction of strain sensors with respect to its implementation on the outer surface of concrete structures and with compensation of potential temperature drifts. These sensors are projected with look forward to maximal elongation and strength which can be applied to the sensor. Each sensor contains two optical fibers with FBGs. One FBG is glued into the sensor in points of fixation which are in the line with mounting holes. This FBG is prestressed to half of measurement range, than the stretching and pressing can be measured simultaneously by one FBG. The second FBG is placed inside the sensor without fixation to measure temperature drifts. The sensor can be used to structure health monitoring. The sensors to measurement vibration are based on tilted fiber Bragg grating (TFBG) with fiber taper. The sensor uses the TFBG as a cladding modes reflector and fiber taper as a bend-sensitive recoupling member. The lower cladding modes (ghost), reflected from TFBG, is recoupled back into the fiber core via tapered fiber section. We focused on optimization of TFBG tilt angle to reach maximum reflection of the ghost and taper parameters. In this article we present complete set-up, optical and mechanical parameters of both types of sensors.
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Bretislav Mikel, Bretislav Mikel, Radek Helan, Radek Helan, Zdenek Buchta, Zdenek Buchta, Milan Holík, Milan Holík, Michal Jelinek, Michal Jelinek, Ondrej Cip, Ondrej Cip, } "Optical fiber sensors for measurement strain and vibration", Proc. SPIE 9450, Photonics, Devices, and Systems VI, 94500G (6 January 2015); doi: 10.1117/12.2070480; https://doi.org/10.1117/12.2070480
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