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Applied Optics

Applied Optics


  • Vol. 36, Iss. 25 — Sep. 1, 1997
  • pp: 6190–6195

High accuracy, wide range, rotation angle measurement by the use of two parallel interference patterns

Xiaoli Dai, Osami Sasaki, John E. Greivenkamp, and Takamasa Suzuki  »View Author Affiliations

Applied Optics, Vol. 36, Issue 25, pp. 6190-6195 (1997)

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Based on the idea of measuring small rotation angles with a parallel interference pattern (PIP), a method is developed to measure large rotation angles accurately. Two parallel PIP’s that have different periods are used to measure a rotation angle of an object. The measurement made with a small-period PIP provides a high accuracy, and the measurement made with a large-period PIP provides a wide range. An accurate measurement for wide-range angles is made by combining the two measured values. The accuracy of the phase detection is determined by the periods of two PIP’s. Rotation angles from approximately -30 to 30 arc min can be measured with an accuracy of 0.2 arc sec. Analytical results are supported by experimental results.

© 1997 Optical Society of America

Original Manuscript: June 17, 1996
Revised Manuscript: November 20, 1996
Published: September 1, 1997

Xiaoli Dai, Osami Sasaki, John E. Greivenkamp, and Takamasa Suzuki, "High accuracy, wide range, rotation angle measurement by the use of two parallel interference patterns," Appl. Opt. 36, 6190-6195 (1997)

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