DETECTION OF THE OBJECT VELOCITY USING DOUBLY-SCATTERED DYNAMIC SPECKLES UNDER GAUSSIAN-BEAM ILLUMINATION

被引：8

作者：

OKAMOTO, T

ASAKURA, T

机构：

[1] Research Institute of Applied Electricity, Hokkaido University, Sapporo, Hokkaido

来源：

JOURNAL OF MODERN OPTICS | 1991年 / 38卷 / 09期

关键词：

D O I：

10.1080/09500349114551931

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The dynamic properties of doubly-scattered speckles produced at the image plane have been investigated using a scattering model that consists of a coherent Gaussian beam, a cascade of two moving diffusers and a single imaging lens. Dependence of the fluctuation speed of time-varying image speckles on the velocities of the diffusers is found to change with the size of illuminating speckles and the width of the point-spread function of the imaging lens. When the point-spread function and the focal position satisfy certain conditions, three kinds of velocity information-the velocity of each diffuser, the average velocity of the diffusers and the velocity difference between the diffusers-can be obtained by measuring a temporal correlation length of the time-varying speckle intensity. Experimental results confirm the theoretical predictions.

引用

页码：1821 / 1839

页数：19

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