De Veuster C, Slangen P, Renotte Y, Berwart L, Lion Y
Appl Opt. 1996 Jan 10;35(2):240-7. doi: 10.1364/AO.35.000240.
Interferometric techniques combined with phase shifting allow computation of the phase that is linked to the displacement of the object under study. The phases before and after displacement are computed from three or more interferograms (called specklegrams when speckle is used as the information carrier). Subtraction of these two phase patterns leads to a raw phase map. Phase unwrapping restores the 2π discontinuities and gives a continuous phase map. The disk-growing algorithm presented allows the inner and the outer propagation of the unwrapping from a growing disk and so avoids the main problem of anisotropic error propagation for noisy phase maps. It works successfully in speckle interferometry.
干涉测量技术与相移相结合，可计算与被研究物体位移相关的相位。位移前后的相位由三张或更多干涉图（当使用散斑作为信息载体时称为散斑图）计算得出。这两个相位图案相减得到一个原始相位图。相位展开可恢复2π的不连续性并给出一个连续的相位图。所提出的圆盘生长算法允许从一个生长的圆盘进行展开的内部和外部传播，从而避免了噪声相位图中各向异性误差传播的主要问题。它在散斑干涉测量中成功应用。
