A method for bending and strain measurement of micro-cantilever based on digital image correlation with initialization optimization

作者：Liu, Hong Tao; Liang, Zhen Ning; Hu, Wen; Mo, Jin Qiu; Wang, Shi Gang^*

来源：Journal of Shanghai Jiaotong University, 2014, 48(5): 693-701.

• Algorithm parameters
• Cross-correlation algorithm
• Digital image correlation methods
• Digital image correlations
• Feature points matching
• Micro-cantilevers
• Strain information
• Transformation parameters

A method for bending and strain analysis of micro-cantilever with initialization optimization by digital image correlation was proposed. Feature points were detected and matched in the scale space based on the image context obtained under microscope. First, the transformation parameters were calculated by digital image correlation with high order in the feature points. Then, the initial transformation parameters of every pixel of the cantilever were obtained by the interpolation in two-dimension which could be used as the initial value for the iterative spatial domain cross correlation algorithm (Newton-Raphson method). Finally, the refined displacement and strain information at some special grid were calculated. While the algorithm parameters were optimized in the experiment of the simulated bended images, the performance of the proposed method was verified through the strain comparison with the finite element method.

• 出版日期2014
• 单位上海交通大学