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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 16 — Aug. 15, 2005
  • pp: 2101–2103

Fringe projection profilometry with nonparallel illumination: a least-squares approach

Lujie Chen and Chenggen Quan  »View Author Affiliations


Optics Letters, Vol. 30, Issue 16, pp. 2101-2103 (2005)
http://dx.doi.org/10.1364/OL.30.002101


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Abstract

Under a nonparallel illumination condition, fringe patterns projected on an object have unequal fringe spacing that would introduce a nonlinear carrier phase component. This Letter describes a nonlinear carrier removal technique based on a least-squares approach. In contrast with conventional methods, the proposed algorithm would not magnify phase measurement uncertainty, nor does it require direct estimation of system geometrical parameters. The theoretical expression of the carrier phase function on the reference is derived and expanded in a power series. The unknown coefficients in the series are determined by a least-squares method. By subtracting the calculated carrier phase function from the unwrapped phase map, the phase distribution of the object profile is obtained.

© 2005 Optical Society of America

OCIS Codes
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure

Citation
Lujie Chen and Chenggen Quan, "Fringe projection profilometry with nonparallel illumination: a least-squares approach," Opt. Lett. 30, 2101-2103 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-16-2101

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