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Applied Optics

Applied Optics


  • Vol. 36, Iss. 32 — Nov. 10, 1997
  • pp: 8403–8412

Video-rate fringe analyzer based on phase-shifting electronic moiré patterns

Jun-ichi Kato, Ichirou Yamaguchi, Toru Nakamura, and Shigesumi Kuwashima  »View Author Affiliations

Applied Optics, Vol. 36, Issue 32, pp. 8403-8412 (1997)

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We have developed a fringe analyzer that delivers the phase distribution at a video rate from a fringe pattern containing a spatial carrier. It is based on parallel generations of three phase-shifted moiré patterns through electronic multiplication with computer-generated reference gratings and low-pass filtering. The phase distribution is derived by the subsequent parallel processing of these patterns on the basis of a three-step phase-shifting algorithm. By modification of the bias phase distribution of the reference gratings, several functions, such as correction of an initial wave-front error, are realized in real time. The usefulness of this analyzer is demonstrated experimentally for phase measurements by grating-projection surface topography and interferometry.

© 1997 Optical Society of America

Original Manuscript: February 26, 1997
Revised Manuscript: May 15, 1997
Published: November 10, 1997

Jun-ichi Kato, Ichirou Yamaguchi, Toru Nakamura, and Shigesumi Kuwashima, "Video-rate fringe analyzer based on phase-shifting electronic moiré patterns," Appl. Opt. 36, 8403-8412 (1997)

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