Practical phase unwrapping of holographic interferograms

Gordon M. Brown

doi:10.1117/12.135306

1 January 1992 Practical phase unwrapping of holographic interferograms

Gordon M. Brown

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135306
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Although fully automated phase unwrapping of stepped phase interferograms is a worthy goal and is receiving considerable attention, this Utopian circumstance has not yet been uniquely achieved in a reasonable time on complex real life structures such as an automotive powertrain. The method presented here uses a binary bad spot mask and a seed point mask to phase unwrap the underlying modulo 2(pi) phase map of very complicated structures. Fringe amplitude, modulation, and triangular unit cell path dependence are used to automatically create a portion of the mask. Partition lines are added manually to the mask to separate sheared fringe systems, structural boundaries, and regions of sampling theorem violation.

Citation Download Citation

Gordon M. Brown "Practical phase unwrapping of holographic interferograms", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135306

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