Kulkarni Rishikesh, Rastogi Pramod
Opt Lett. 2014 Jul 1;39(13):3722-4. doi: 10.1364/OL.39.003722.
This Letter proposes a new method for the estimation of the first- and second-order phase derivatives corresponding to strain and curvature from a single fringe pattern in digital holographic interferometry. The method is based on a discrete energy separation algorithm, which provides a biased phase derivative estimate in a noisy environment. Subsequently, the least-squares spline approximation with optimal number of knots selection technique is used to obtain the accurate estimation of phase derivatives. The accuracy and computational efficiency of the proposed method is validated with simulation and experimental results.
本文提出了一种新方法，用于从数字全息干涉术中的单个条纹图案估计与应变和曲率对应的一阶和二阶相位导数。该方法基于离散能量分离算法，该算法在噪声环境中提供有偏的相位导数估计。随后，使用具有最佳节点选择技术的最小二乘样条逼近法来获得相位导数的精确估计。通过仿真和实验结果验证了该方法的准确性和计算效率。
