Patil Abhijit, Langoju Rajesh, Rastogi Pramod
Opt Express. 2006 Jan 9;14(1):88-102. doi: 10.1364/opex.14.000088.
The paper presents approaches based on traditional phase shifting, flexible least-squares, and signal processing methods in dual phase shifting interferometry primarily applied to holographic moiré for retrieving multiple phases. The study reveals that these methods cannot be applied straightforward to retrieve phase information and discusses the constraints associated with these methods. Since the signal processing method is the most efficient among these approaches, the paper discusses significant issues involved in the successful implementation of the concept. In this approach the knowledge of the pair of phase steps is of paramount interest. Thus the paper discusses the choice of the pair of phase steps that can be applied to the phase shifting devices (PZTs) in the presence of noise. In this context, we present a theoretical study using Cramér-Rao bound with respect to the selection of the pair of phase step values in the presence of noise.
本文介绍了基于传统相移、灵活最小二乘法以及双相移干涉测量中的信号处理方法的途径，这些方法主要应用于全息莫尔条纹以获取多个相位。该研究表明，这些方法不能直接用于获取相位信息，并讨论了与这些方法相关的限制。由于信号处理方法在这些途径中效率最高，本文讨论了成功实施该概念所涉及的重要问题。在这种方法中，相位步长对的知识至关重要。因此，本文讨论了在存在噪声的情况下可应用于相移装置（压电陶瓷）的相位步长对的选择。在此背景下，我们针对存在噪声时相位步长对值的选择进行了使用克拉美罗界的理论研究。
