Optical method for the surface topographic characterization of Fresnel lenses

Juan Carlos Martínez Antón; José Antonio Gómez Pedrero; José Alonso Fernández; Juan Antonio Quiroga

doi:10.1117/12.896952

21 September 2011 Optical method for the surface topographic characterization of Fresnel lenses

Juan Carlos Martínez Antón, José Antonio Gómez Pedrero, José Alonso Fernández, Juan Antonio Quiroga

Proceedings Volume 8169, Optical Fabrication, Testing, and Metrology IV; 816910 (2011) https://doi.org/10.1117/12.896952
Event: SPIE Optical Systems Design, 2011, Marseille, France

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°.

Citation Download Citation

Juan Carlos Martínez Antón, José Antonio Gómez Pedrero, José Alonso Fernández, and Juan Antonio Quiroga "Optical method for the surface topographic characterization of Fresnel lenses", Proc. SPIE 8169, Optical Fabrication, Testing, and Metrology IV, 816910 (21 September 2011); https://doi.org/10.1117/12.896952

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