当一束激光照射到粗糙表面上时会产生散斑.即使接收端保持静止，收集到的散斑图案依然会发生变化，看起来像是在“漂移”一样.我们的研究发现，此时散斑漂移的主要原因来自粗糙表面吸热膨胀导致反射光的相位变化，从而使得干涉图样发生变化.我们采集大量实验数据并且使用相关系数及其变化率对散斑的动态变化进行描述和分析.另外，我们还通过数值计算模拟了散斑漂移现象.

When a laser beam hits a rough surface,scattered spots are produced.Even though the receiver remains stationary,the collected scatter pattern changes and appears to “drift”.It is found that the main reason for the scattering drift is the phase change of the light due to the heat absorption and expansion of the rough surface,which causes the interference pattern to change.A large amount of experimental data is collected to analyze the dynamics of the scattering using the correlation coefficient and its rate of change.In addition,the scattering drift is also simulated.