1 May 2014 Development of a laser-speckle-based measurement principle for the evaluation of mechanical deformation of stacked metal sheets
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Abstract
Stacks of metal plates are widely used in electrical motors, transformers and generators to reduce for eddy current loss in their magnetic circuit. To model the mechanical behavior of such special material structures a profound knowledge of the underlying physical processes is needed. This paper describes a highly specialized optical sensor system utilizing the laser-speckle-effect for non-contacting strain and displacement measurements of stacked metal plates. In order to gain insights into the mechanical changes of stacked metal structures during defined mechanical load, a certain kind of spatially resolving digital laser speckle photography has been used to measure displacements between individual layers of the stacked metal sheets at high resolution. The developed speckle template matching algorithm takes into account for the very special surface structure and the given loading behavior. The sensor system is capable of acquiring displacement fields with a resolution in the order of a single micron at video rate and beyond, enabling the real time observation of load experiments on stacked metal plate structures.
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Clemens Halder, Clemens Halder, Thomas Thurner, Thomas Thurner, Mathias Mair, Mathias Mair, } "Development of a laser-speckle-based measurement principle for the evaluation of mechanical deformation of stacked metal sheets", Proc. SPIE 9132, Optical Micro- and Nanometrology V, 91321F (1 May 2014); doi: 10.1117/12.2052316; https://doi.org/10.1117/12.2052316
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