Andersson A, Runnemalm A, Sjödahl M
Division of Experimental Mechanics, Luleå University of Technology, SE-971 87 Luleå, Sweden.
Appl Opt. 1999 Sep 1;38(25):5408-12. doi: 10.1364/ao.38.005408.
The compensation of large in-plane motions in digital speckle-pattern interferometry (DSPI) with the use of digital speckle photography (DSP) is demonstrated. Ordinary recordings of DSPI are recombined and analyzed with DSP. The DSP result is used to compensate for the bulk speckle motion prior to calculation of the phase map. This results in a high fringe contrast even for deformations of several speckle diameters. In addition, for the case of an in-plane deformation, it is shown that the absolute phase change in each pixel may be unwrapped by use of the DSP result as an initial guess. The principles of this method and experiments showing the in-plane rotation of a plate and the encounter of two rounded plates are presented.
本文展示了利用数字散斑摄影（DSP）补偿数字散斑干涉术（DSPI）中面内大位移的方法。将DSPI的普通记录与DSP进行重组和分析。在计算相位图之前，利用DSP的结果补偿散斑的整体运动。即使对于几个散斑直径的变形，也能获得高条纹对比度。此外，对于面内变形的情况，结果表明可以将DSP结果作为初始猜测来展开每个像素的绝对相位变化。文中介绍了该方法的原理以及展示平板面内旋转和两个圆形平板相遇的实验。
