数字全息干涉测量的时域和复数空间处理法

Temporal phase retrieval from digital holographic interferometry in complex field

描写了一种新颖的在复数域处理数字全息干涉的方法。不同于一般的直接处理相位信息的数字相位相减法,本文提出的方法处理的是可以直接得出相位的复数信号。基于这种概念,本文提出了两种时域相位提取的算法。在这两种算法中,CCD相机感光原件的每一个像素做为一个新的独立的传感器,然后每个像素的复数信号作为时间的函数被测量和处理。这两种算法被应用于有台阶的物体的形貌检测,试验的结果证明,本文提出的算法优越于现在的数字全息通用的算法。

This paper describes a novel method of processing complex phasors in digital holographic interferometry （DHI） , Unlike commonly used digital phase subtraction method that operates on the phase itself, the proposed method operates on a complex phasor instead. Two temporal phase retrieval algorithms are developed, in which the complex phasor of each pixel is measured and analyzed as a function of time. The developed algorithms are demonstrated using profile measurement of step heights. Experimental results show that the proposed phase retrieval algorithms for DHI perform well compared with conventional methods.