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Proceedings Paper

Calibration of elasto-optic constant in digital gradient sensing method
Author(s): Zhenkun Lei; Xuan Li; Fangxu Zhang
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Paper 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.

Paper Details

Date Published: 21 August 2014
PDF: 6 pages
Proc. SPIE 9233, International Symposium on Photonics and Optoelectronics 2014, 92330F (21 August 2014); doi: 10.1117/12.2068802
Show Author Affiliations
Zhenkun Lei, Dalian Univ. of Technology (China)
Xuan Li, Dalian Univ. of Technology (China)
Fangxu Zhang, Dalian Univ. of Technology (China)

Published in SPIE Proceedings Vol. 9233:
International Symposium on Photonics and Optoelectronics 2014
Zhiping Zhou, Editor(s)

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