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Proceedings Paper

A two-bucket phase-stepped shearing speckle interferometer: why it works
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Paper Abstract

It is generally acknowledged that it takes at least three phase-stepped speckle patterns to obtain quantitative phase information. However, if only a phase change has to be determined, a two-bucket approach can be followed, under certain conditions. The background of the two-bucket algorithm, and the requirements with respect to the use of it, are explained. Examples of modeled and measured phase stepped speckle intensity data, showing numerical instability when conditions are not met are presented. It is also shown that two phase-stepped speckle pattern pairs, taken before and after an event can be sufficient to determine phase changes invoked by the event.

Paper Details

Date Published: 27 May 2003
PDF: 8 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516630
Show Author Affiliations
Peter A. A. M. Somers, Delft Univ. of Technology (Netherlands)
Hedser H. van Brug, TNO-TDP (Netherlands)
Joseph J.M. Braat, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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