Gren P
Appl Opt. 2001 May 10;40(14):2304-9. doi: 10.1364/ao.40.002304.
The measuring of situations with optical measuring methods is difficult when a deformation field must be determined while it is superposed to comparatively large rotating or translating object motion. Interferometric methods such as pulsed TV holography might be suitable to measure the small transient deformation, but the often-large bulk motion makes the phase information disappear. However, by a combination of digital speckle photography (DSP) (also called digital image correlation) with pulsed TV holography, such measuring problems can be mastered. A method to calculate the bulk in-plane motion by DSP from the usual pulsed TV holography recordings and then to use this information to restore the interference phase is proposed. This technique may be attractive in the study of transient vibrations overlaid on rotating or translating motions.
当必须在叠加有相对较大的旋转或平移物体运动的情况下确定变形场时，使用光学测量方法来测量这些情况是困难的。诸如脉冲电视全息术之类的干涉测量方法可能适用于测量微小的瞬态变形，但通常较大的整体运动会使相位信息消失。然而，通过将数字散斑摄影（DSP）（也称为数字图像相关）与脉冲电视全息术相结合，可以解决此类测量问题。提出了一种通过DSP从常规脉冲电视全息记录中计算整体平面内运动，然后利用该信息恢复干涉相位的方法。该技术在研究叠加在旋转或平移运动上的瞬态振动时可能具有吸引力。
