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Proceedings Paper

Modelling and simulation of a fibre Bragg grating strain sensor based on a magnetostrictive actuator principle
Author(s): V. Schukar; X. Gong; D. Hofmann; F. Basedau; E. Koeppe; M. Bartholmai; A. Westphal; M. Sahre; U. Beck
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Paper Abstract

A new concept for the self-diagnosis of embedded fiber Bragg grating (FBG) strain sensors was developed, simulated and experimentally tested. This concept is based on a magnetostrictive metallic layer directly coated on the fibre cladding over the grating segment of the FBG sensor, so that an on-demand external magnetic field in a millitesla scale can produce a controllable artificial strain as an indication signal for the remote optical interrogator. The relationship between the pre-defined magnetic field and its induced Bragg wavelength shift characterizes this validation concept. Any deviation of the local bonding state of the interfaces from the initial or/and any change of shear strain transferring mechanism from composite matrix to the optical fibre core will result in alterations in this sensitive relationship, and thus triggers an immediate alert for a further inspection. The finite element method is used to simulate the strain of this configuration as result of different values of the magnetic field in order to optimize the geometrical sensor parameters. The simulations are verified by experiments results.

Paper Details

Date Published: 29 April 2016
PDF: 9 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 989913 (29 April 2016); doi: 10.1117/12.2224728
Show Author Affiliations
V. Schukar, Bundesanstalt für Materialforschung und -prüfung (Germany)
X. Gong, Bundesanstalt für Materialforschung und -prüfung (Germany)
D. Hofmann, Bundesanstalt für Materialforschung und -prüfung (Germany)
F. Basedau, Bundesanstalt für Materialforschung und -prüfung (Germany)
E. Koeppe, Bundesanstalt für Materialforschung und -prüfung (Germany)
M. Bartholmai, Bundesanstalt für Materialforschung und -prüfung (Germany)
A. Westphal, Bundesanstalt für Materialforschung und -prüfung (Germany)
M. Sahre, Bundesanstalt für Materialforschung und -prüfung (Germany)
U. Beck, Bundesanstalt für Materialforschung und -prüfung (Germany)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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