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Sensors 2016, 16(11), 1853;

Strain Measurement in Aluminium Alloy during the Solidification Process Using Embedded Fibre Bragg Gratings

Institute for Measurement Systems and Sensor Technology, Technical University of Munich, 80333 Munich, Germany
Chair of Metal Forming and Casting, Technical University of Munich, 85748 Garching, Germany
Photonics Laboratory, Munich University of Applied Sciences, 80335 Munich, Germany
Author to whom correspondence should be addressed.
Academic Editors: Manuel Lopez-Amo, Jose Miguel Lopez-Higuera and Jose Luis Santos
Received: 28 September 2016 / Revised: 24 October 2016 / Accepted: 25 October 2016 / Published: 4 November 2016
(This article belongs to the Special Issue Optical Fiber Sensors 2016)
Full-Text   |   PDF [3181 KB, uploaded 4 November 2016]   |  


In recent years, the observation of the behaviour of components during the production process and over their life cycle is of increasing importance. Structural health monitoring, for example of carbon composites, is state-of-the-art research. The usage of Fibre Bragg Gratings (FBGs) in this field is of major advantage. Another possible area of application is in foundries. The internal state of melts during the solidification process is of particular interest. By using embedded FBGs, temperature and stress can be monitored during the process. In this work, FBGs were embedded in aluminium alloys in order to observe the occurring strain. Two different FBG positions were chosen in the mould in order to compare its dependence. It was shown that FBGs can withstand the solidification process, although a compression in the range of one percent was measured, which is in agreement with the literature value. Furthermore, different lengths of the gratings were applied, and it was shown that shorter gratings result in more accurate measurements. The obtained results prove that FBGs are applicable as sensors for temperatures up to 740 °C. View Full-Text
Keywords: fibre bragg grating; aluminium alloy; solidification process fibre bragg grating; aluminium alloy; solidification process

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Weraneck, K.; Heilmeier, F.; Lindner, M.; Graf, M.; Jakobi, M.; Volk, W.; Roths, J.; Koch, A.W. Strain Measurement in Aluminium Alloy during the Solidification Process Using Embedded Fibre Bragg Gratings. Sensors 2016, 16, 1853.

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