Aberration-free moiré profilometry—Analysis, simulation and implementation of the optimal setup geometry

The accuracy of fringe projection profilometry strongly depends on the setup. In this article different setups are discussed, and compared using custom-made freeware simulation software. The best suited geometry for aberration-free measurements on small objects is implemented in a practical setup. B...

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Bibliographic Details
Published in:Optics and lasers in engineering 2012-08, Vol.50 (8), p.1119-1129
Main Authors: Buytaert, Jan A.N., Ribbens, Bart, Vanlanduit, Steve, Dirckx, Joris J.J.
Format: Article
Language:English
Subjects:
Aberration-free
Liquid crystal
Planar fringes
Projection moiré profilometry
Telecentric
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Summary:The accuracy of fringe projection profilometry strongly depends on the setup. In this article different setups are discussed, and compared using custom-made freeware simulation software. The best suited geometry for aberration-free measurements on small objects is implemented in a practical setup. By using specific telecentric lenses and different grid periods, both for projection and observation, we obtain a close to aberration-free phase-shifting projection moiré profilometer. In combination with liquid crystal display panels, the setup becomes practical, versatile and user-friendly. ► We describe and compare non-telecentric and telecentric projection moiré setups. ► We present freeware fringe projection simulation software. ► We build a liquid crystal telecentric projection moiré profilometer.
ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2012.01.006