Keywords
elektronic speckle
ESPI
white light speckle photography
experimental strain analysis
analize of speckle pattern
speckle pattern
luminescent powder
Abstract
For the generation of speckle images, a luminescent powder applied in a small amount to the sample surface and stimulated by UV radiation was used. We obtained fine-grained speckle patterns with very high contrast and small size of spots. The shape of the single speckle, unlike laser method, is circular, which is important for the effectiveness of the used digital image analysis methods. The measurements of displacements and deformations were made by use of digital image registration and its analysis using correlation procedures. The results are presented in the form of bitmaps, tables and graphs. The developed method was tested on flat wood specimens subjected to three-point bending.
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