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Proceedings Paper

Optical method for the surface topographic characterization of Fresnel lenses
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Paper Abstract

Fresnel lenses and other faceted or micro-optic devices are increasingly used in multiple applications like solar light concentrators and illumination devices. As applications are more exigent this characterization is of increasing importance. We present a technique to characterize the surface topography of optical surfaces. It is especially well adapted to Fresnel lenses where abrupt surface slopes are usually difficult to handle in conventional techniques. The method is based on a new photometric strategy able to codify the height information in terms of optical absorption in a liquid. A detailed topographic map is simple to acquire by capturing images of the surface. Some experimental results are presented. A single pixel height resolution of ~0.1 μm is achieved for a height range of ~50 μm. A surface slope analysis is also made achieving a resolution of ~±0.15°.

Paper Details

Date Published: 22 September 2011
PDF: 8 pages
Proc. SPIE 8169, Optical Fabrication, Testing, and Metrology IV, 816910 (22 September 2011); doi: 10.1117/12.896952
Show Author Affiliations
Juan Carlos Martínez Antón, Univ. Complutense de Madrid (Spain)
José Antonio Gómez Pedrero, Univ. Complutense de Madrid (Spain)
José Alonso Fernández, Univ. Complutense de Madrid (Spain)
Juan Antonio Quiroga, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 8169:
Optical Fabrication, Testing, and Metrology IV
Angela Duparré; Roland Geyl, Editor(s)

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