Dual-wavelength digital holographic shape measurement using speckle movements and phase gradients

被引：18
作者：
Khodadad, Davood [1 ]
Hallstig, Emil [2 ]
Sjodahl, Mikael [1 ]
机构：
[1] Lulea Univ Technol, SE-97187 Lulea, Sweden
[2] Optron Partner Dp AB, SE-93127 Skelleftea, Sweden
来源：
OPTICAL ENGINEERING | 2013年 / 52卷 / 10期
关键词：
digital holography; speckle movements; shape measurement; dual wavelength; phase gradients; WAVE-FRONT RECONSTRUCTION; DECORRELATION; DISPLACEMENT;
D O I：
10.1117/1.OE.52.10.101912
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A new method to measure shape by analyzing the speckle movements in images generated by numerical propagation from dual-wavelength holograms is presented. The relationship of the speckle movements at different focal distances is formulated, and it is shown how this carries information about the surface position as well as the local slope of the object. It is experimentally verified that dual-wavelength holography and numerically generated speckle images can be used together with digital speckle correlation to retrieve the object shape. From a measurement on a cylindrical test object, the method is demonstrated to have a random error in the order of a few micrometers. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.
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页数：7
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