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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 19 — Sep. 12, 2011
  • pp: 18458–18469

Phase-stepped fringe projection by rotation about the camera’s perspective center

Y. R. Huddart, J. D. Valera, N. J. Weston, T. C. Featherstone, and A. J. Moore  »View Author Affiliations

Optics Express, Vol. 19, Issue 19, pp. 18458-18469 (2011)

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A technique to produce phase steps in a fringe projection system for shape measurement is presented. Phase steps are produced by introducing relative rotation between the object and the fringe projection probe (comprising a projector and camera) about the camera’s perspective center. Relative motion of the object in the camera image can be compensated, because it is independent of the distance of the object from the camera, whilst the phase of the projected fringes is stepped due to the motion of the projector with respect to the object. The technique was validated with a static fringe projection system by moving an object on a coordinate measuring machine (CMM). The alternative approach, of rotating a lightweight and robust CMM-mounted fringe projection probe, is discussed. An experimental accuracy of approximately 1.5% of the projected fringe pitch was achieved, limited by the standard phase-stepping algorithms used rather than by the accuracy of the phase steps produced by the new technique.

© 2011 OSA

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(110.2650) Imaging systems : Fringe analysis

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 13, 2011
Revised Manuscript: August 13, 2011
Manuscript Accepted: August 15, 2011
Published: September 6, 2011

Y. R. Huddart, J. D. Valera, N. J. Weston, T. C. Featherstone, and A. J. Moore, "Phase-stepped fringe projection by rotation about the camera’s perspective center," Opt. Express 19, 18458-18469 (2011)

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