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二维数字图像相关方法作为一种非接触全场变形测量的光学方法,在工程上有着广泛的应用。由于其假设物体只发生面内位移,而实验中往往存在离面位移,从而引起测量误差。本文针对这一问题利用了针孔模型,从理论上分析了离面位移对普通镜头测量结果的影响,通过铝块平移实验验证了理论分析的正确性。利用提出的理论模型修正橡胶材料的变形测量结果,并与远心镜头测量结果进行对比,发现修正后的普通镜头测量的结果更接近远心镜头测量的结果。最后,本文根据理论分析和实验验证,给出了减小或消除离面位移造成误差的方法。
Two-dimensional digital image correlation method is widely used in engineering as an optical method of non-contact full-field deformation measurement. Because of its assumption that only objects within the plane of displacement, and experiments often exist out of plane displacement, causing measurement error. In this paper, the pinhole model is used to solve this problem. The influence of the out-of-plane displacement on the measurement result of the ordinary lens is theoretically analyzed. The correctness of the theoretical analysis is verified by the aluminum block translation experiment. By using the proposed theoretical model to correct the deformation of the rubber material and compare it with the telecentric lens measurement results, it is found that the corrected ordinary lens measurement result is closer to the telecentric lens measurement result. Finally, based on theoretical analysis and experimental verification, this paper gives a method to reduce or eliminate the error caused by out-of-plane displacement.