Statistical properties of dynamic speckles formed by a deflecting laser beam

被引：14

作者：

Semenov, D. V. ^{[1
]}

Miridonov, S. V. ^{[2
]}

Nippolainen, E. ^{[1
]}

Kamshilin, A. A. ^{[1
]}

机构：

[1] Univ Kuopio, Dept Phys, FIN-70211 Kuopio, Finland

[2] CICESE, Dept Opt, Ensenada 22860, Baja California, Mexico

来源：

OPTICS EXPRESS | 2008年 / 16卷 / 02期

关键词：

D O I：

10.1364/OE.16.001238

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We analyze statistical properties of dynamic speckles formed when an optically rough surface is illuminated by a fast-deflecting laser beam. The modified space-time correlation function of the light-intensity fluctuations has been introduced to estimate the correlation parameters of a dynamic speckle pattern. Dynamic speckles are considered in their application to range sensing using evaluation of the light-power-modulation frequency of a signal obtained from the integrating photodetector after spatial filtering of the scattered light. Multichannel configuration is suggested to improve the system accuracy. Conditions that should be fulfilled to get uncorrelated responses of photodiode are found. Proper averaging of the multichannel data allows designing a non-interferometric range sensor capable for measuring distance with accuracy of 1 mu m during as short time as 1 ms. (c) 2008 Optical Society of America.

引用

页码：1238 / 1249

页数：12

共 14 条

[1] PRINCIPLES AND DEVELOPMENT OF SPATIAL-FILTERING VELOCIMETRY [J].