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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 15 — Jul. 18, 2011
  • pp: 14137–14144

A novel encoded-phase technique for phase measuring profilometry

Yuankun Liu, Xianyu Su, and Qican Zhang  »View Author Affiliations

Optics Express, Vol. 19, Issue 15, pp. 14137-14144 (2011)

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Three-dimensional (3-D) shape measurement using a novel encoded-phase grating is proposed. The projected sinusoidal fringe patterns are designed with wrapped and encoded phase instead of monotonic and unwrapped phase. Phase values of the projected fringes on the surface are evaluated by phase-shift technique. The absolute phase is then restored with reference to the encoded information, which is extracted from the differential of the wrapped phase. To solve the phase errors at some phase-jump areas, Hilbert transform is employed. By embedding the encoded information in the wrapped phase, there is no extra pattern that needs to be projected. The experimental results identify its feasibility and show the possibility to measure the spatially isolated objects. It will be promising to analyze dynamic objects.

© 2011 OSA

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 26, 2011
Revised Manuscript: June 21, 2011
Manuscript Accepted: June 23, 2011
Published: July 8, 2011

Yuankun Liu, Xianyu Su, and Qican Zhang, "A novel encoded-phase technique for phase measuring profilometry," Opt. Express 19, 14137-14144 (2011)

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