Experimental investigation of strain errors in stereo-digital image correlation due to camera calibration

Xinxing Shao; Feipeng Zhu; Zhilong Su; Xiangjun Dai; Zhenning Chen; Xiaoyuan He

doi:10.1117/1.OE.57.3.034102

5 March 2018 Experimental investigation of strain errors in stereo-digital image correlation due to camera calibration

Xinxing Shao, Feipeng Zhu, Zhilong Su, Xiangjun Dai, Zhenning Chen, Xiaoyuan He

Author Affiliations +

Optical Engineering, Vol. 57, Issue 3, 034102 (March 2018). https://doi.org/10.1117/1.OE.57.3.034102

Abstract

The strain errors in stereo-digital image correlation (DIC) due to camera calibration were investigated using precisely controlled numerical experiments and real experiments. Three-dimensional rigid body motion tests were conducted to examine the effects of camera calibration on the measured results. For a fully accurate calibration, rigid body motion causes negligible strain errors. However, for inaccurately calibrated camera parameters and a short working distance, rigid body motion will lead to more than 50-μϵ strain errors, which significantly affects the measurement. In practical measurements, it is impossible to obtain a fully accurate calibration; therefore, considerable attention should be focused on attempting to avoid these types of errors, especially for high-accuracy strain measurements. It is necessary to avoid large rigid body motions in both two-dimensional DIC and stereo-DIC.

Citation Download Citation

Xinxing Shao, Feipeng Zhu, Zhilong Su, Xiangjun Dai, Zhenning Chen, and Xiaoyuan He "Experimental investigation of strain errors in stereo-digital image correlation due to camera calibration," Optical Engineering 57(3), 034102 (5 March 2018). https://doi.org/10.1117/1.OE.57.3.034102

Received: 22 November 2017; Accepted: 13 February 2018; Published: 5 March 2018

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