8 September 2014 Designing null screens type sub-structured Ronchi to test a fast plano-convex aspheric lens
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Abstract
In order to evaluate either qualitative or quantitatively the shape of fast plano-convex aspheric lenses, a method to design null screens type sub-structured Ronchi is proposed. The null screens are formed with nonuniform curves which allows us to have both thin and thick monochrome strips between contiguous curves. The screens are printed on a light transmission modulator and placed in front of the lens under test, they are illuminated with a collimated monochromatic beam propagating along the optical axis, in such a way that through the process of refraction will form a uniform straight fringes pattern which are recorded at a predefined plane of detection, finally processing its image recorded we could be able to get a quantitative evaluation of the lens under test. The designs of these null screens are based on the equations of the caustic surface produced by refraction. The null screens can be printed in gray levels on a light transmission modulator depending on the applied voltage on it. A preliminary test for a fast plano-convex aspheric lens with F=# = 0:8 is presented in this work. This method also could be applied to alignment of optical systems.
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Diana Castán Ricaño, Maximino Avendaño-Alejo, "Designing null screens type sub-structured Ronchi to test a fast plano-convex aspheric lens", Proc. SPIE 9195, Optical System Alignment, Tolerancing, and Verification VIII, 919509 (8 September 2014); doi: 10.1117/12.2062454; https://doi.org/10.1117/12.2062454
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