11. Drifting Speckles

• 指导老师：俞熹

• 娄泽坤

Shine a laser beam onto a dark surface. A granular pattern can be seen inside the spot. When the pattern is observed by a camera or the eye, that is moving slowly, the pattern seems to drift relative to the surface. Explain the phenomenon and investigate how the drift depends on relevant parameters.

并不准确的翻译： 将激光照射到暗的表面，光斑中可见颗粒状图案。如果观察用的相机或者观察者的眼睛慢慢移动，图案看起来有相对表面的位移。解释这个现象，并且探究这种位移的相关参量。 — 娄泽坤 2019/10/12 15:58

http://stemfellowship.org/iypt-2020-references-2/iypt-2020-reference-problem-11-drifting-speckles

https://www.bb.ustc.edu.cn/jpkc/guojia/dxwlsy/kj/part2/grade3/LaserSpeckle.html

光学中的散斑现象 Speckle phenomena in optics by Goodman, Joseph W.