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Proceedings Paper

Generating sinusoidal fringe by defocusing: potentials for unprecedentedly high-speed 3-D shape measurement using a DLP projector
Author(s): Ji Li; Song Zhang
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Paper Abstract

This paper presents a technique that reaches 3-D shape measurement speed beyond the digital-light-processing (DLP) projector's projection speed. For this technique, a "solid-state" binary structured pattern is generated with each micromirror pixel always being at one status (ON or OFF). By this means, any time segment of projection can represent the whole signal, thus the exposure time can be shorter than the projection time. A sinusoidal fringe pattern is generated by properly defocusing a binary one, and the Fourier method can be adopted for 3-D shape measurement. We have successfully reached 2000 Hz 3-D shape measurement speed with good measurement quality. Because the fringe pattern is generated digitally, this proposed technique provides an alternative flexible approach for high-speed applications.

Paper Details

Date Published: 2 August 2010
PDF: 7 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77900B (2 August 2010); doi: 10.1117/12.860179
Show Author Affiliations
Ji Li, Iowa State Univ. (United States)
Song Zhang, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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