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Applied Optics

Applied Optics


  • Vol. 36, Iss. 13 — May. 1, 1997
  • pp: 2848–2855

Determination of small angular displacement by moiré fringes of matched radial–parallel gratings

B. J. Kim, J. S. Song, J. T. Kim, J. H. Jo, S. Chang, and K. C. Yuk  »View Author Affiliations

Applied Optics, Vol. 36, Issue 13, pp. 2848-2855 (1997)

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We investigate the properties of the moiré fringes of matched radial–parallel (MRP) gratings that are useful for the fine visual indication of angular displacements. Moiré patterns formed by overlapping two different MRP gratings of angular pitches, Pθ and Pθ′ (< Pθ), can provide a simple fringe-counting method for determining both the angle and the direction of the relative angular displacement of the gratings within the accuracy of (Pθ′/Mθ), where Mθ is the angular magnification for radial vernier fringes.

© 1997 Optical Society of America

Original Manuscript: July 25, 1996
Revised Manuscript: October 16, 1996
Published: May 1, 1997

B. J. Kim, J. S. Song, J. T. Kim, J. H. Jo, S. Chang, and K. C. Yuk, "Determination of small angular displacement by moiré fringes of matched radial–parallel gratings," Appl. Opt. 36, 2848-2855 (1997)

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