Fringe projection with a sinusoidal phase grating
Applied Optics, Vol. 48, Issue 24, pp. 4774-4784 (2009)
http://dx.doi.org/10.1364/AO.48.004774
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Abstract
Phase-shifting profilometry requires projection of sinusoidal fringes on a 3D object. We analyze the visibility and frequency content of fringes created by a sinusoidal phase grating at coherent illumination. We derive an expression for the intensity of fringes in the Fresnel zone and measure their visibility and frequency content for a grating that has been interferometrically recorded on a holographic plate. Both evaluation of the systematic errors due to the presence of higher harmonics by simulation of a profilometric measurement and measurement of 3D coordinates of test objects confirm the good performance of the sinusoidal phase grating as a projective element. In addition, we prove theoretically that in comparison with a sinusoidal amplitude grating this grating produces better quality of fringes in the near-infrared region. Sinusoidal phase gratings are fabricated easily, and their implementation in fringe projection profilometry facilitates construction of portable, small size, and low-cost devices.
© 2009 Optical Society of America
OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1960) Diffraction and gratings : Diffraction theory
(050.5080) Diffraction and gratings : Phase shift
(070.6760) Fourier optics and signal processing : Talbot and self-imaging effects
(100.2650) Image processing : Fringe analysis
ToC Category:
Diffraction and Gratings
History
Original Manuscript: February 17, 2009
Revised Manuscript: June 27, 2009
Manuscript Accepted: August 3, 2009
Published: August 18, 2009
Citation
Elena Stoykova, Georgi Minchev, and Ventseslav Sainov, "Fringe projection with a sinusoidal phase grating," Appl. Opt. 48, 4774-4784 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-24-4774
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