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Optical Engineering

Digital image processing of moire fringe patterns and an application to fracture in bovine dentin
Author(s): Dong Sheng Zhang; Dwayne D. Arola; Min Ma
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Paper Abstract

A single fringe phase shifting technique is presented for extracting the whole-field displacement distribution from single fringe patterns. By making a small modification in the traditional Fourier transform (FFT) method for fringe processing, the proposed method is capable of maintaining the fringe sign information. An additional approach is introduced that utilizes knowledge of the fringe sign in identifying fringe skeletons with high precision. A combination of these methods of fringe pattern processing was used to examine the whole-field displacement distribution in double cantilever beam (DCB) fracture specimens prepared from bovine maxillary molars. Phase maps and precise fringe skeletons were generated using the proposed techniques from fringe patterns obtained using moire interferometry. Both aspects of the displacement measurements were used to determine the local displacement distribution near the crack tip, and to study the mechanics of fracture.

Paper Details

Date Published: 1 May 2002
PDF: 7 pages
Opt. Eng. 41(5) doi: 10.1117/1.1467938
Published in: Optical Engineering Volume 41, Issue 5
Show Author Affiliations
Dong Sheng Zhang, National Univ. of Defense Technology (United States)
Dwayne D. Arola, Univ. of Maryland/Baltimore County (United States)
Min Ma, National Univ. of Defense Technology (China)

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