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Proceedings Paper

Single phase-step algorithm for phase difference measurement using ESPI
Author(s): Meinhard Sesselmann; Armando Albertazzi Jr.
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Paper Abstract

The paper describes a new algorithm that uses only two mutually phase-stepped interferograms per deformation state in order to retrieve modulo 2(pi) the phase signal due to deformation. It is suited for use in ESPI where the initial phase in the interference term is the phase of speckle that varies randomly over the imaging sensor. Any phase step value except those close to multiples of (pi) can be applied. Practical advantages of the algorithm are outlined. An analysis of phase measurement uncertainty is presented, results are discussed and compared with those from standard phase-shifting algorithms. Obtained results prove that measurement uncertainties smaller 2(pi) /20 are feasible.

Paper Details

Date Published: 30 June 1998
PDF: 7 pages
Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); doi: 10.1117/12.312932
Show Author Affiliations
Meinhard Sesselmann, Univ. Federal de Santa Catarina (Brazil)
Armando Albertazzi Jr., Univ. Federal de Santa Catarina (Brazil)

Published in SPIE Proceedings Vol. 3478:
Laser Interferometry IX: Techniques and Analysis
Malgorzata Kujawinska; Gordon M. Brown; Mitsuo Takeda, Editor(s)

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