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Applied Optics

Applied Optics


  • Vol. 34, Iss. 32 — Nov. 10, 1995
  • pp: 7486–7496

Automated interferogram analysis based on an integrated expert system

Wonjong Joo and Soyoung S. Cha  »View Author Affiliations

Applied Optics, Vol. 34, Issue 32, pp. 7486-7496 (1995)

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Interferometric data, either from single-frame fringe-tracking and Fourier-transform techniques or from multiframe phase-shifting techniques, pose a problem of 2π ambiguity, that is, wrapped-phase information. As the degree of noise level increases, especially in high-speed aerodynamics, these techniques encounter difficulties in phase extraction to provide continuous unwrapped-phase information. Here, a new hybrid approach, called the integrated expert system, which is developed primarily for aerodynamic interferogram evaluation, is presented. The integrated expert system utilizes interferometric-specific knowledge rules to compensate for the limitations associated with conventional techniques. It integrates in a single structure an expert system and algorithmic programming to provide, as much as possible, a unified approach for all the interferogram evaluation techniques. This initial attempt may provide a useful groundwork for future development in intelligent interferogram processing.

© 1995 Optical Society of America

Original Manuscript: March 29, 1995
Revised Manuscript: June 15, 1995
Published: November 10, 1995

Wonjong Joo and Soyoung S. Cha, "Automated interferogram analysis based on an integrated expert system," Appl. Opt. 34, 7486-7496 (1995)

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