Chinese Optics Letters, 2012, 10 (s1): S11202, Published Online: May. 16, 2012
Active noise thin-plate spline smoothing method for full-f ield strain measurement by digital image correlation Download: 739次
Abstract
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.
Jiaqing Zhao, Pan Zeng, Liping Lei, Hongfei Du, Wenbin He. Active noise thin-plate spline smoothing method for full-f ield strain measurement by digital image correlation[J]. Chinese Optics Letters, 2012, 10(s1): S11202.