Active noise thin-plate spline smoothing method for full-field strain measurement by digital image correlation

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2012,（z1）
• 页码范围: 114-116
• 页数: 3页
• 语种: 英文
• DOI: 10.3788/COL201210.S11202

摘要

Digital image correlation has become an important and effective non-contact optical full-field strain measurement technique.The strain field obtained directly by image correlation algorithm is full of noise.In this letter,we explore a novel way of actively adding small amount of Gaussian random noise to original displacement field,subsequently utilizing the well-known thin-plate spline smoothing (TPSS) technique to smooth the noised displacement field,and finally differentiating smoothed displacement field to get reliable strain field.The resultant method,named as active noise thin-plate spline smoothing (ANTPSS),outperforms the conventional TPSS and spline least-squares approximation.Moreover,ANTPSS successfully smooths the displacement filed obtained from three-point bending experiment of foam block and generates a reliable inhomogeneous strain field.