The three-dimensional digital image correlation (3D-DIC) method featuring two synchronized cameras has been widely used in the field of experimental mechanics to measure full-field 3D shape and deformation. However, the requirement of two synchronized cameras often limits the application of the regular 3D-DIC method. This study proposes a single-camera 3D-DIC system based on a fiber bundle (FB), aiming to make full use of the flexibility of the FB and further broaden the range of application of the 3D-DIC method. The multi-channel FB enables the proposed method to photograph the test object from two different angles with a single camera. In order to verify the effectiveness of the proposed method, a three-point bending deformation measurement experiment and a cylinder 3D reconstruction experiment were carried out. For comparison, the regular 3D-DIC system was used to measure the same specimens. Factors affecting the accuracy of the proposed method were analyzed and the corresponding optimization methods were given. As the proposed method can isolate the imaging sensor from harsh environment, it demonstrates significant potential in determining 3D deformation in intense electromagnetic interference environment and under water.

具有两个同步相机的三维数字图像相关 (3D-DIC) 方法已广泛应用于实验力学领域，以测量全场 3D 形状和变形。然而，两个同步相机的需求往往限制了常规 3D-DIC 方法的应用。本研究提出了一种基于纤维束（FB）的单相机3D-DIC系统，旨在充分利用FB的灵活性，进一步拓宽3D-DIC方法的应用范围。多通道 FB 使所提出的方法能够使用单个相机从两个不同角度拍摄测试对象。为了验证所提方法的有效性，进行了三点弯曲变形测量实验和圆柱体3D重建实验。为了比较，常规 3D-DIC 系统用于测量相同的样本。分析了影响所提方法精度的因素，并给出了相应的优化方法。由于所提出的方法可以将成像传感器与恶劣环境隔离，因此它在确定强电磁干扰环境和水下的 3D 变形方面显示出巨大的潜力。