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首页> 外文期刊>Jordan Journal of Mechanical and Industrial Engineering >Influence of Camera's Optical Axis Non-perpendicularity on Measurement Accuracy of Twodimensional Digital Image Correlation
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Influence of Camera's Optical Axis Non-perpendicularity on Measurement Accuracy of Twodimensional Digital Image Correlation

机译：相机光轴非垂直度对二维数字图像相关测量精度的影响

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The two-dimensional digital image correlation technique is very commonly used in a wide variety of solid mechanics applications for measuring in-plane deformations of planner surfaces. The perpendicularity of the camera's optical axis to the surface being observed is one of the basic conditions for the validity of the measurement. Small magnitudes of camera misalignment angles, up to two or three degrees, can go easily unnoticed during the initial setting of the experimental setup especially when the stand-off-distance between the camera and the surface is not small. In the work presented in this paper we investigate the errors in strain measurements caused by the non-perpendicularity of the camera's optical axis, with respect to the surface being observed, both theoretically and experimentally. In-plane rigid-body-translations in the directions perpendicular and parallel to the camera tilt axis are used for estimating the resulting strain errors. Results show that the nonperpendicularity of the camera causes errors in both the normal and shear strains. Misalignment angles as small as 2o are found to cause strain error greater than 103 ?-strains. The magnitude of strain error is found to increase linearly with both the misalignment angle and the magnitude of in-plane translation while it is inversely related to the stand-off-distance. The analyses show that simple in-plane rigid-body-translations experiments can be used to estimate the resulting strain errors and more importantly to detect and hence correct any existing non-perpendicularity between the camera's optical axis and the target surface. Experiments show that misalignment angles smaller than 1o can be detected using in-plane rigid-bodytranslations.
机译：二维数字图像相关技术非常广泛地用于各种实体力学应用中，用于测量平面表面的平面变形。相机光轴与被观察表面的垂直度是测量有效性的基本条件之一。在实验设置的初始设置期间，尤其是当相机和表面之间的支撑距离不小的时候，很小的相机未对准角度（高达2或3度）很容易被发现。在本文提出的工作中，无论是从理论上还是从实验上，我们都研究了由于相机光轴的非垂直性而导致的应变测量误差。在垂直于和平行于照相机倾斜轴的方向上的平面内刚体平移用于估计产生的应变误差。结果表明，相机的非垂直性会导致法向和剪切应变方面的误差。发现小到2o的偏心角会导致应变误差大于103？-应变。发现应变误差的大小随偏心角和平面内平移的大小线性增加，而与支撑距离成反比。分析表明，可以使用简单的平面内刚体平移实验来估计由此产生的应变误差，更重要的是可以检测并校正相机光轴与目标表面之间的任何不垂直的垂直度。实验表明，使用平面内刚体平移可以检测到小于1o的未对准角度。

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