Yan Hao, Pan Bing
Opt Lett. 2014 Sep 1;39(17):5166-9. doi: 10.1364/OL.39.005166.
A new simultaneous three-dimensional (3D) displacement measurement technique based on the combination of digital holography (DH) and digital imaging correlation (DIC) is proposed. The current DH-based 3D displacement measurement technique needs three sets of DH setups, and only the phase images are utilized in measurements, with all the intensity images discarded. In contrast, the proposed new technique only adopts a single off-axis DH setup. In the proposed technique, the phase images are used to extract out-of-plane displacements, but the intensity images (instead of being discarded) are processed by an intensity correlation algorithm to retrieve in-plane displacement components. Because the proposed technique fully takes advantage of all the information obtained by an off-axis DH without additional optical arrangements, it is simpler and more practical than the existing DH-based 3D displacement measurement technique. Experiments performed on a United States Air Force (USAF) target demonstrate that both the in-plane and out-of-plane displacements can be accurately determined by the proposed technique.
提出了一种基于数字全息术（DH）与数字图像相关技术（DIC）相结合的新型同步三维（3D）位移测量技术。当前基于DH的3D位移测量技术需要三套DH装置，并且在测量中仅使用相位图像，而所有强度图像都被丢弃。相比之下，所提出的新技术仅采用单个离轴DH装置。在所提出的技术中，相位图像用于提取面外位移，但强度图像（而非被丢弃）通过强度相关算法进行处理以检索面内位移分量。由于所提出的技术充分利用了离轴DH获得的所有信息，无需额外的光学装置，因此它比现有的基于DH的3D位移测量技术更简单、更实用。在美国空军（USAF）靶标上进行的实验表明，所提出的技术能够准确测定面内和面外位移。
