Carlsson T E, Wei A
Industrial Metrology and Optics, Department of Materials Processing, KTH, 100 44 Stockholm, Sweden.
Appl Opt. 2000 Jun 1;39(16):2628-37. doi: 10.1364/ao.39.002628.
A method for measurement of continuous displacements that uses phase-shifting speckle interferometry is presented. The initial random phase of the speckle pattern is evaluated by phase shifting before deformation. The changing phase thereafter is evaluated from only one image at a time by a least-squares algorithm. The technique can be used for measuring transients and other dynamic events, heat expansion as well as other phenomena, for which it is difficult to accomplish phase shifting during deformation. Theory along with computer simulations and experimental results are described.
提出了一种利用相移散斑干涉测量连续位移的方法。散斑图案的初始随机相位在变形前通过相移进行评估。此后变化的相位通过最小二乘法算法每次仅从一幅图像中进行评估。该技术可用于测量瞬态和其他动态事件、热膨胀以及其他现象，对于这些现象在变形过程中难以实现相移。文中描述了相关理论以及计算机模拟和实验结果。
