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Sensors 2016, 16(9), 1433; doi:10.3390/s16091433

Modeling of Distributed Sensing of Elastic Waves by Fiber-Optic Interferometry

1
Center for Integrated Sensor Systems, Danube University Krems, Viktor Kaplan Straße 2, 2700 Wr. Neustadt, Austria
2
Institute of Computer Technology, Vienna University of Technology, Gußhausstraße 27-29/384, 1040 Vienna, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 4 July 2016 / Revised: 19 August 2016 / Accepted: 30 August 2016 / Published: 6 September 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [790 KB, uploaded 6 September 2016]   |  

Abstract

This paper deals with the transduction of strain accompanying elastic waves in solids by firmly attached optical fibers. Stretching sections of optical fibers changes the time required by guided light to pass such sections. Exploiting interferometric techniques, highly sensitive fiber-optic strain transducers are feasible based on this fiber-intrinsic effect. The impact on the actual strain conversion of the fiber segment’s shape and size, as well as its inclination to the elastic wavefront is studied. FEM analyses show that severe distortions of the interferometric response occur when the attached fiber length spans a noticeable fraction of the elastic wavelength. Analytical models of strain transduction are presented for typical transducer shapes. They are used to compute input-output relationships for the transduction of narrow-band strain pulses as a function of the mechanical wavelength. The described approach applies to many transducers depending on the distributed interaction with the investigated object. View Full-Text
Keywords: strain sensor; interferometry; fiber optic strain sensor; interferometry; fiber optic
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Agbodjan Prince, J.; Kohl, F.; Sauter, T. Modeling of Distributed Sensing of Elastic Waves by Fiber-Optic Interferometry. Sensors 2016, 16, 1433.

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