Non-linear joint transform correlator for micro-displacement measurement using speckle patterns

被引：0
|
作者：
Valdivieso Gonzalez, Luis G. [1 ]
Guerrero Bermudez, Jader E. [2 ]
Tepichin Rodriguez, Eduardo [1 ]
机构：
[1] INAOE, Puebla 72840, Mexico
[2] Univ Ind Santander, Escuela Fis, Grp Opt & Tratamiento Senales, Bucaramanga 678, Colombia
来源：
REVISTA FACULTAD DE INGENIERIA-UNIVERSIDAD DE ANTIOQUIA | 2013年 / 68期
关键词：
Laser speckle; micro-displacements; nonlinear joint transform correlator;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This work presents a procedure for measuring displacements of tens micrometer, in one and two dimensions, based on the correlation between two speckle patterns. For this purpose, two objective speckle patterns are recorded by a digital camera one before and one after the object has been moved- and placed in the input plane of nonlinear joint transform correlator. Nonlinear transformation of the joint power spectrum allows a sharper correlation peak and a high signal to noise ratio. The autocorrelation peak coordinates of the first pattern are set as a reference for measuring shifts of the successive cross-correlation peak. One criterion for reliable measure is proposed. Results related with different distances sample-sensor and illuminating wavelengths at 632.8 nm and 543.5 nm are presented.
引用
收藏
页码：20 / 26
页数：7
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