WebJul 20, 2024 · In this context, most DIC applications specify an “ideal” speckle size of 3–5 pixels to avoid an aliased pattern that will degrade accuracy [ 13 ]. They further recommend a subset size containing at least 3–5 speckles to ensure proper tracking during the deformation process. WebNov 17, 2024 · The optimized speckle quality and contrast promote the accuracy of DIC point-wise tracking of displacement, and therefore, improves the DGS measurement accuracy. (3) High system integration and better operation. In conventional DGS methods, the speckle target and the lighting system are two separated parts.
An Application of Digital Image Correlation (DIC) Method …
WebSince DIC uses subsets of the speckle patternin order to derive a displacement measurement, the qualityof the speckle pattern must be optimized as to minimize the noise and maximize the accuracy of the measurement performed. Examples of speckle patterns are presented in the figure below. Webwhere the speckle pattern needs to be applied, d) computer-generated, optimized speckle pattern template required to be imprinted on the metal specimen surface with high precision and optical contrast and a subset (red square) represented on the pattern. In DIC analysis, the subsets at the reference state are tracked in how to select multiple emails to delete gmail
High optical contrast nanoimprinted speckle patterns for …
WebMay 25, 2024 · The DIC hole-drilling measurements start by applying the speckle patterns to a sample. This involves completely covering the sample with a thin layer of white paint. Once the white paint completely dries, black paint is used to mark the speckle patterns, aimed to cover 50% of the measurement area. WebNov 1, 2024 · DIC pattern applications based on lithography techniques enable reproducible pattern transfer on specimen surfaces with controlled pattern feature size and distribution. Using lithography-based methods, numerically prepared speckle pattern designs can also be used as templates and transferred to the specimen surfaces with high precision [ 17 ]. WebJan 31, 2024 · To make a good speckle, it must be: Random With spot sizes adapted to the measurement carried out. To check that the speckle pattern is random and does not contain too much black or too much white, we can use grey level histograms. An optimal histogram is a “flat” one with an equivalent distribution of white and black. how to select multiple files in documents