光学学报, 2013, 33 (10): 1029001, 网络出版: 2013-09-06   

旋转圆锥目标动态散斑的时间相关函数

Time Correlation Functions of Dynamic Speckle Produced by Rotating Cone Object
作者单位
1 西安电子科技大学理学院, 陕西 西安 710071
2 西安工业大学光电工程学院, 陕西 西安 710032
摘要
因散射体运动而随时间变化的散斑现象称为动态散斑。研究了激光入射光束与圆锥体旋转中心线垂直情况下的动态散斑空间时间相关函数,并简化出归一化时间相关函数,表明动态散斑的统计特性与旋转速度、曲率半径、表面微观结构和光学几何结构有关。测量了圆锥体在不同旋转速度下的动态散斑统计特性图像。数值计算聚四氟乙烯和硬铝两种材料的圆锥体在不同速度下的归一化时间相关函数,表明速度越快,其归一化时间相关函数下降得越快,在相同速度下硬铝材料的归一化时间相关函数比聚四氟乙烯材料下降得要快。实验结果与理论推导比较相符。
Abstract
Dynamic speckle is a speckle phenomenon that produced by moving diffuser with time. The space-time correlation functions of dynamic speckle and normalized time correlation functions are obtained under the situation that incident laser beam is perpendicular to cone rotation centerline. The space-time correlation functions of dynamic speckle show that statistical properties of dynamic speckle are related to the rotation speed, radius of curvature, micro-structure and optical geometry structure. The dynamic speckle images produced by cone with different rotation speeds are measured. Normalized time correlation functions of polytetrafluoroethylene (PTFE) cone and duralumin cone with different rotation speeds are calculated, which shows that the normalized time correlation functions decrease sharply when the speed increases, and the normalized time correlation functions of duralumin fall faster than that of PTFE at the same rotation speed. The results of experiment are similar to that of formula derivation.

阳志强, 吴振森, 张耿. 旋转圆锥目标动态散斑的时间相关函数[J]. 光学学报, 2013, 33(10): 1029001. Yang Zhiqiang, Wu Zhensen, Zhang Geng. Time Correlation Functions of Dynamic Speckle Produced by Rotating Cone Object[J]. Acta Optica Sinica, 2013, 33(10): 1029001.

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