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

Davood Khodadad; Emil J. Hallstig; Mikael Sjödahl

doi:10.1117/1.OE.52.10.101912

28 June 2013 Dual-wavelength digital holographic shape measurement using speckle movements and phase gradients

Davood Khodadad, Emil J. Hallstig, Mikael Sjödahl

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Optical Engineering, Vol. 52, Issue 10, 101912 (June 2013). https://doi.org/10.1117/1.OE.52.10.101912

Abstract

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.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Davood Khodadad, Emil J. Hallstig, and Mikael Sjödahl "Dual-wavelength digital holographic shape measurement using speckle movements and phase gradients," Optical Engineering 52(10), 101912 (28 June 2013). https://doi.org/10.1117/1.OE.52.10.101912

Published: 28 June 2013

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