1 January 2000 Enhanced 3-D reconstruction of surfaces using multicolor gratings
Author Affiliations +
Optical Engineering, 39(1), (2000). doi:10.1117/1.602335
Abstract
Most optical topolography systems use a single-wavelength laser for projection, using a swept spot, a moving line, or a projected grating. In a typical projected grating system, the gratings are shifted and a series of images is used to recover the 3-D shape of the target. When the series of images is analyzed in the normal phase shift manner, the resulting 2-D phase map typically has phase unwrapping problems due to noise and Nyquist limits. Surfaces with large vertical discontinuities present a problem for phase unwrapping 3-D shape recovery. We look at simultaneously projecting multiple wavelengths onto a surface to help avoid problems in unwrapping the 2-D phase map. Multicolor projection and shape recovery are demonstrated with a white-light Michelson interferometer and with a two-color Mach-Zehnder interferometer. Using multiple wavelengths, it is unnecessary to rotate the interferometer mirror to change the grating pitch and some operations can be done in parallel, which reduces scanning time. Limitations and improvements in the current system are discussed.
Bernard R. Gilbert, Joel H. Blatt, "Enhanced 3-D reconstruction of surfaces using multicolor gratings," Optical Engineering 39(1), (1 January 2000). http://dx.doi.org/10.1117/1.602335
JOURNAL ARTICLE
9 PAGES


SHARE
KEYWORDS
Interferometers

Phase shifts

Phase measurement

Mirrors

3D acquisition

Optical engineering

Cameras

RELATED CONTENT

Fuzzy reasoning processor for camera image autofocus
Proceedings of SPIE (April 21 1995)
The investigation on mirrors maladjustment for RLG
Proceedings of SPIE (August 19 2011)
Noncontact optical sensor for inside-diameter measurements
Proceedings of SPIE (August 10 1998)
Recent Developments In Urea
Proceedings of SPIE (March 09 1987)

Back to Top