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Proceedings Paper

Calibration of a phase-shifting moire interferometer
Author(s): Kenneth E. Perry Jr.; James McKelvie
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Paper Abstract

Originally developed as a method to assist in the assessment of optical components, the phase shifting technique has recently seen application to many other types of interferometers, including holographic, speckle, and moire systems for strain analysis. In these applications, close control of the phase shifts may be impossible due to the effect of mechanical vibrations, and this presents difficulties when extracting the phase, since the reference phase shifts are generally assumed to be known. Several approaches to the problem of determining the reference phase shifts in a perturbing environment are critically evaluated using computer simulations. The precision and accuracy of these methods are demonstrated through a practical solid mechanics example. It was found that the reference phase shifts can be determined with sufficient accuracy using all of the methods considered, and that the ultimate precision of the system was limited by additional factors -- particularly grating noise.

Paper Details

Date Published: 10 December 1993
PDF: 12 pages
Proc. SPIE 2003, Interferometry VI: Techniques and Analysis, (10 December 1993); doi: 10.1117/12.165448
Show Author Affiliations
Kenneth E. Perry Jr., Univ. of Strathclyde (United Kingdom)
James McKelvie, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 2003:
Interferometry VI: Techniques and Analysis
Osuk Y. Kwon; Gordon M. Brown; Malgorzata Kujawinska, Editor(s)

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