Deformation Measurements of Materials at Low Temperatures Using Laser Speckle Photography Method
We observed deformations of several materials during cooling down process from room temperature to liquid nitrogen temperature using the laser speckle photography method. The in-plane displacements were measured by the image plane speckle photography and the out-of-plane displacement gradients by the defocused speckle photography. The results of measurements of in-plane displacement are compared with those of FEM analysis. The applicability of laser speckle photography method to cryogenic engineering will also be discussed.
KeywordsThermal Contraction Photographic Film Alumina Ceramic Electronic Speckle Pattern Interferometry Speckle Interferometry
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