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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 24 — Dec. 15, 2010
  • pp: 4121–4123

Optimal pulse width modulation for sinusoidal fringe generation with projector defocusing

Yajun Wang and Song Zhang  »View Author Affiliations

Optics Letters, Vol. 35, Issue 24, pp. 4121-4123 (2010)

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Recently, a study showed that generating sinusoidal fringe patterns by properly defocusing binary ones can significantly simplify three-dimensional shape measurement system development and drastically improve its speed. However, when the fringe stripes are very wide, it is very difficult for this technique to achieve high-quality measurement. This Letter presents a method to improve this technique by selectively eliminating high-frequency harmonics induced by a squared binary pattern. As a result, better sinusoidal fringe patterns can be generated with a small degree of defocusing even for wide fringe stripes. Simulation and experiments will be presented to verify the performance of this proposed technique.

© 2010 Optical Society of America

OCIS Codes
(100.5070) Image processing : Phase retrieval
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 25, 2010
Manuscript Accepted: November 7, 2010
Published: December 9, 2010

Yajun Wang and Song Zhang, "Optimal pulse width modulation for sinusoidal fringe generation with projector defocusing," Opt. Lett. 35, 4121-4123 (2010)

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