Abstract: 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.

Key words: speckle drift, correlation coefficient, interference, numerical simulation