23 August 2017 Optical spherometer for measuring large curvature radii of convex surfaces
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Abstract
Measuring large curvature radii of convex surfaces with high precision is a challenge because the spherometer’s focus must be positioned at the apex of the surface and at the center of curvature of the surface by moving the surface or the spherometer. If the radius of curvature is larger than the back focus of spherometer, then measurement is not possible. In this work, we propose to use the FOCOIVA system1 to move the focus of the spherometer in longitudinal way without modifying the f number by moving two lenses inside it, with this mechanism it is possible to measure radii of curvature of several meters in length. The curves of movement of the lenses and the optical parameters of the lenses that compose the spherometer are presented.
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Jorge de Jesús Alvarado Martínez, Jorge de Jesús Alvarado Martínez, Sergio Vázquez y Montiel, Sergio Vázquez y Montiel, Cesar Joel Camacho Bello, Cesar Joel Camacho Bello, } "Optical spherometer for measuring large curvature radii of convex surfaces", Proc. SPIE 10375, Current Developments in Lens Design and Optical Engineering XVIII, 1037515 (23 August 2017); doi: 10.1117/12.2274323; https://doi.org/10.1117/12.2274323
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