On errors of digital image correlation due to speckle patterns

Bing Pan; Kemao Qian; Huimin Xie; Anand Asundi

doi:10.1117/12.839326

25 August 2009 On errors of digital image correlation due to speckle patterns

Bing Pan, Kemao Qian, Huimin Xie, Anand Asundi

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73754Z (2009) https://doi.org/10.1117/12.839326
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Digital Image Correlation (DIC) is an effective and flexible optical tool for full-field deformation measurement. Some aspects that influence the accuracy and precision of DIC have not been thoroughly investigated. A typical example is that the speckle patterns on the specimen surface as a carrier of deformation information significantly affect the measurement of DIC. The aim of this paper is to investigate the influence of speckle patterns on the displacement measurement error of the DIC. A concise theoretical model is derived, which indicates that the speckle pattern does not introduce systematic error but introduce random error in the measured displacement. Numerical experiments using five speckle patterns with distinctly different intensity distribution taken from actual experiments have been performed to validate the proposed concepts, and the results show that the standard deviation error (i.e. precision) of measured displacement are closely related to the speckle patterns and is in good agreement with the prediction of the proposed theoretical model.

Citation Download Citation

Bing Pan, Kemao Qian, Huimin Xie, and Anand Asundi "On errors of digital image correlation due to speckle patterns", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73754Z (25 August 2009); https://doi.org/10.1117/12.839326

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