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Proceedings Paper

Holographic measurement of deformation using carrier fringe and FFT techniques
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Paper Abstract

This paper describes a carrier fringe technique for measuring surface deformation. In contrast to conventional holography and fringe analysis, this holographic system is based on the fiber optics and automatic spatial carrier fringe pattern analysis techniques. Carrier fringes are generated by simply translating the object beam between two exposures. Single-mode optical fibers are used to transfer both the object and reference beams. The use of optical fibers offers advantages in the field of optical holography. The fast Fourier transform (FFT) method is used to process the interferograms. This method of fringe pattern analysis is a successful technique for extracting phase information from fringe patterns which result from the interference of tilted wavefronts. The paper also introduces the tile level, minimum spanning tree and phase unwrapping techniques. The method is illustrated by measuring the centrally loaded disk. A correction is made for the nonuniform spacing of the carrier fringes, which was introduced by a slight inclination of the object. The results are given for disk, including the perspective plot of the out-of-plane deformation field, the maps of wrapped and unwrapped phase, and a contour map of the unwrapped phase.

Paper Details

Date Published: 1 September 1991
PDF: 13 pages
Proc. SPIE 1507, Holographic Optics III: Principles and Applications, (1 September 1991); doi: 10.1117/12.47068
Show Author Affiliations
Chenggen Quan, Univ. of Warwick (United Kingdom)
John T. Judge, Univ. of Warwick (United Kingdom)
Peter John Bryanston-Cross, Univ. of Warwick (United Kingdom)

Published in SPIE Proceedings Vol. 1507:
Holographic Optics III: Principles and Applications
G. Michael Morris, Editor(s)

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