Pan Bing, Wang Qiong
Opt Express. 2013 Oct 21;21(21):25056-68. doi: 10.1364/OE.21.025056.
A simple, cost-effective but practical microscopic 3D-DIC method using a single camera and a transmission diffraction grating is proposed for surface profile and deformation measurement of small-scale objects. By illuminating a test sample with quasi-monochromatic source, the transmission diffraction grating placed in front of the camera can produce two laterally spaced first-order diffraction views of the sample surface into the two halves of the camera target. The single image comprising negative and positive first-order diffraction views can be used to reconstruct the profile of the test sample, while the two single images acquired before and after deformation can be employed to determine the 3D displacements and strains of the sample surface. The basic principles and implementation procedures of the proposed technique for microscopic 3D profile and deformation measurement are described in detail. The effectiveness and accuracy of the presented microscopic 3D-DIC method is verified by measuring the profile and 3D displacements of a regular cylinder surface.
提出了一种简单、经济高效且实用的微观三维数字图像相关（3D-DIC）方法，该方法使用单个相机和透射衍射光栅来测量小尺度物体的表面轮廓和变形。通过用准单色光源照射测试样品，放置在相机前方的透射衍射光栅可以将样品表面的两个横向间隔的一阶衍射视图投射到相机靶标的两半部分。包含正负一阶衍射视图的单个图像可用于重建测试样品的轮廓，而在变形前后获取的两个单幅图像可用于确定样品表面的三维位移和应变。详细描述了所提出的微观三维轮廓和变形测量技术的基本原理和实施步骤。通过测量规则圆柱表面的轮廓和三维位移，验证了所提出的微观3D-DIC方法的有效性和准确性。
