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Proceedings Paper

Combined deformation and shape measurement with ESPI
Author(s): David I. Farrant; Jon N. Petzing; John Raymond Tyrer; Bozenko F. Oreb
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Paper Abstract

Conventional models of ESPI deformation measurement are valid only for planar objects, and then only in the paraxial region. If an object is non-planar, then accurate deformation values can only be recovered if the surface shape is also known. This is because the local sensitivity vectors of deformation are a function of both the illumination and observation directions, which vary with the 3D position of the object points. We present a compact ESPI system for measurement of both shape and deformation using a mutual optical configuration. We also introduce an efficient method of data analysis. The system is demonstrated on a vibrating cylinder, where the shape information is used to derive the true out-of-plane deformation on the cylinder surface.

Paper Details

Date Published: 13 August 1999
PDF: 8 pages
Proc. SPIE 3744, Interferometry '99: Techniques and Technologies, (13 August 1999); doi: 10.1117/12.357749
Show Author Affiliations
David I. Farrant, CSIRO (Australia)
Jon N. Petzing, Loughborough Univ. (United Kingdom)
John Raymond Tyrer, Loughborough Univ. (United Kingdom)
Bozenko F. Oreb, CSIRO (Australia)

Published in SPIE Proceedings Vol. 3744:
Interferometry '99: Techniques and Technologies
Malgorzata Kujawinska; Mitsuo Takeda, Editor(s)

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