Dynamic Deformation Measurement of Specular Surface with Deflectometry and Speckle Digital Image Correlation.

ABSTRACT: The deformation measurement of a specular surface is of great importance during the quality inspection and installation of optical elements or wafers, especially those with large apertures. We propose a deflectometry method with speckle digital image correlation (DeSDIC) to realize the dynamic and high-accuracy measurement of the deformation on specular surfaces, with a simple system structure and robustness to noises and environmental vibrations. Random speckle pattern displayed on liquid crystal display is reflected by the original surface under test (SUT), and the distorted pattern is recorded by a camera. This originally distorted pattern is taken as the reference image, and the patterns captured afterwards are digitally correlated with the reference image to calculate the gradient cha

SUBMITTER: Hu Y 

PROVIDER: S-EPMC7085654 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature