Huntley J M
Department of Mechanical Engineering, Loughborough University, Loughborough LE11 3TU, UK.
Appl Opt. 1999 Apr 10;38(11):2212-5. doi: 10.1364/ao.38.002212.
A simple geometrical model was developed for calculation of the contrast of a polychromatic image-plane speckle pattern from a source of light with high spatial coherence. It is based on counting the number of independent speckle patterns that contribute to a given point in the image plane. This results in a simple equation for the contrast as a function of imaging geometry; relative orientation of the projection direction, observation direction, and specimen normal; bandwidth of the light source; and surface roughness. Its validity was established by comparison with an exact solution: rms errors in the calculated contrast were only 0.033 over a wide range of parameter values likely to be encountered in practice.
开发了一个简单的几何模型，用于计算来自具有高空间相干性光源的多色像平面散斑图案的对比度。它基于计算对像平面中给定点有贡献的独立散斑图案的数量。这就得出了一个关于对比度的简单方程，该方程是成像几何形状、投影方向、观察方向和样品法线的相对取向、光源带宽以及表面粗糙度的函数。通过与精确解进行比较确定了其有效性：在实际中可能遇到的广泛参数值范围内，计算出的对比度的均方根误差仅为0.033。
