Fabrication of micro-scale speckle pattern and its applications for deformation measurement

Abstract

A novel and effective method of fabricating a micro-scale speckle pattern applied to metallic and polymeric materials is described. It can be used for measuring deformation under an optical microscope or other high magnification imaging systems. In this paper, the mean intensity gradient (MIG) is used to evaluate the quality of speckle pattern under different fabrication conditions, such as proportion of compound, spinning rates and centrifugal solidifying time, and the optimal fabrication parameters are proposed. Finally, deformation of a PET thin film and interface of an optical fiber device are measured with fabricated micro-scale speckle pattern. Further, it is proved that the speckle pattern produced by the novel method can be used with digital image correlation to measure deformation at micro-length scale.