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论文类型：会议论文
发表时间：2014-08-22
收录刊物：EI、CPCI-S、Scopus
卷号：9233
关键字：digital gradient sensing (DGS); elasto-optic constant; image processing; least-squares method
摘要：The digital gradient sensing (DGS) method is a full-field optical technique to measure the in-plane stress gradients of transparent materials. Elasto-optic constant is an important material characteristic for the DGS method and is usually not given. On the basis of introducing the working principle of DGS method, a calibration method of elasto-optic constant based on the least-squares method is proposed, and the accuracy of iterative convergence is improved by introducing liner error. A theoretical model of a semi-infinite plane under concentrated normal load on boundary is chosen to verify the feasibility of the proposed method. The full-field experimental data of polymethyl methacrylate specimen is obtained from the digital image correlation method. The experimental results show that the least-squares calibration method can determine the elasto-optic constant of transparent materials effectively.