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Proceedings Paper

Smart sensing of aviation structures with fiber optic Bragg grating sensors
Author(s): Michael N. Trutzel; Karsten Wauer; Daniel Betz; Lothar Staudigel; Oskar Krumpholz; Hans-Christian Muehlmann; Thomas Muellert; Wolfgang Gleine
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Paper Abstract

We developed a surface mounting technique where fiber-optic Bragg grating (FBG) sensors are glued to the surface of structures and tested the technique on the surface of a CFRP- wing at the DASA Airbus test center Hamburg for over one year. The FBG sensors were interrogated with a measurement system capable of determining the Bragg wavelength in a few seconds over a spectral range of 60 nm (around 1.53 μm) with an absolute accuracy better than 1 pm. A polarization scrambler was used to account for polarization effects. Excellent consistence between the values of electrical strain gauges and the FBG sensors were found during all measurements. However because this method shows drawbacks in a harsher environment such as a flight test, we are currently investigating the possibilities of integrating FBG sensors into the varnish of the structures. For reasons of their better mechanical performance we use FBG sensors produced on the fiber draw-tower with a special UV-curable coating. The sensors are integrated into an original Airbus varnish build- up. We observed linear strain sensitivities in a temperature range between -50 and +100 °C. Furthermore, at negative temperatures we found a vanish- induced polarization dependence which could be used to differentiate between strain and temperature effects.

Paper Details

Date Published: 12 June 2000
PDF: 10 pages
Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); doi: 10.1117/12.388099
Show Author Affiliations
Michael N. Trutzel, DaimlerChrysler AG (Germany)
Karsten Wauer, DaimlerChrysler AG (Germany)
Daniel Betz, DaimlerChrysler AG (United Kingdom)
Lothar Staudigel, DaimlerChrysler AG (Germany)
Oskar Krumpholz, DaimlerChrysler AG (Germany)
Hans-Christian Muehlmann, DaimlerChrysler Aerospace Airbus GmbH (Germany)
Thomas Muellert, DaimlerChrysler Aerospace Airbus GmbH (Germany)
Wolfgang Gleine, DaimlerChrysler Aerospace Airbus GmbH (Germany)

Published in SPIE Proceedings Vol. 3986:
Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman, Editor(s)

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