Calibration of elasto-optic constant in digital gradient sensing method

Zhenkun Lei; Xuan Li; Fangxu Zhang

doi:10.1117/12.2068802

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21 August 2014 Calibration of elasto-optic constant in digital gradient sensing method

Zhenkun Lei, Xuan Li, Fangxu Zhang

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Proceedings Volume 9233, International Symposium on Photonics and Optoelectronics 2014; 92330F (2014) https://doi.org/10.1117/12.2068802
Event: International Symposium on Photonics and Optoelectronics (SOPO 2014), 2014, Suzhou, China

Abstract

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.

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Zhenkun Lei, Xuan Li, and Fangxu Zhang "Calibration of elasto-optic constant in digital gradient sensing method", Proc. SPIE 9233, International Symposium on Photonics and Optoelectronics 2014, 92330F (21 August 2014); https://doi.org/10.1117/12.2068802

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