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Proceedings Paper

Light sectioning with improved depth resolution using a cylindrical lens to magnify the line deformation
Author(s): Jacques Lewandowski; Lyne Desjardins
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Paper Abstract

Light sectioning computes the object profile using the line deformation seen by a CCD camera. Due to the low magnification between the object and the CCD plane, the image line deformation is small and leads to low resolution on profile measurements. To obtain a larger image deformation, we propose to introduce an additional cylindrical lens that will magnify exclusively the horizontal direction (which contains the profile information) without having any effect on the vertical direction. The limitations of this anamorphic system, such as maximum magnification and maximum object depth, are theoretically examined. The advantages of using a cylindrical lens are mentioned and typical profiles (pyramid, cylinder...) show a gain in depth resolution of approximately 2 to 3 when compared to an earlier light sectioning system. The depth resolution, which was 0.36 mm with the previous system, is now improved to 0.15 mm for an object average distance of 350 mm.

Paper Details

Date Published: 6 January 1994
PDF: 12 pages
Proc. SPIE 2348, Imaging and Illumination for Metrology and Inspection, (6 January 1994); doi: 10.1117/12.198846
Show Author Affiliations
Jacques Lewandowski, College Militaire Royal de Saint-Jean (Canada)
Lyne Desjardins, College Militaire Royal de Saint-Jean (Canada)

Published in SPIE Proceedings Vol. 2348:
Imaging and Illumination for Metrology and Inspection
Donald J. Svetkoff, Editor(s)

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