Fujii H, Asakura T
Appl Opt. 1977 Jan 1;16(1):180-3. doi: 10.1364/AO.16.000180.
The growth of granularity in partially developed speckle patterns produced in the near field of wave object surfaces under illumination of laser light has been experimentally investigated. The average contrast of intensity variations in near-field speckle patterns due to three kinds of objects having different surface qualities has been measured as a function of the receiving distance from the object surface. It is found that a variation of the speckle contrast against the receiving distance is closely related to the surface waviness of objects. On the basis of this relation, a new and simple method is proposed to inspect the surface quality of objects.
对激光照射下波动物体表面近场产生的部分发展的散斑图案中粒度的增长进行了实验研究。测量了三种具有不同表面质量的物体在近场散斑图案中强度变化的平均对比度随距物体表面接收距离的变化情况。发现散斑对比度随接收距离的变化与物体的表面波纹密切相关。基于这种关系，提出了一种新的简单方法来检测物体的表面质量。
