Multiwavelength digital holography with autocalibration of phase shifts and artificial wavelengths
Multiwavelength digital holography with autocalibration of phase shifts and artificial wavelengths
复制标题
DOI：
10.1364/ao.48.0000h1
复制
发表时间：
2009-12-01
期刊：
影响因子：
1.9
通讯作者：
Hoefler, Heinrich
中科院分区：
文献类型：
--
作者：
Carl, Daniel;Fratz, Markus;Hoefler, Heinrich
提出了一种具有时间相移和人工波长自动校准的无透镜多波长数字全息的新实现方法。我们用来计算相移的算法先前被提出[Opt. Lett. 29 183(2004)]，据我们所知，现在首次用于无透镜全息。由于精确地了解所产生的人工波长对绝对测量精度至关重要，因此提出了一种简单有效的直接确定人工波长的方法。校准方法基于对实验装置的简单修改，每个波长只需要额外采集一次图像。给出了表面粗糙、边缘陡峭的金属试样的形状测量结果，并对测量精度进行了讨论。(C) 2009年美国光学学会
A novel implementation of lensless multiwavelength digital holography with autocalibration of temporal phase shifts and artificial wavelength is presented. The algorithm we used to calculate the phase shifts was previously proposed [Opt. Lett. 29 183 (2004)] and, to our knowledge, is now used for the first time in lensless holography. Because precise knowledge of the generated artificial wavelength is crucial for absolute measurement accuracy, a simple and efficient method to determine the artificial wavelength directly is presented. The calibration method is based on a simple modification of the experimental setup and needs just one additional image acquisition per wavelength. The results of shape measurement of a metallic test object with a rough surface and steep edges are shown and the measurement accuracy is discussed. (C) 2009 Optical Society of America