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18 November 2013 Accuracy of the optical testing of a fast aspheric concave surface through null-screens
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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87852Y (2013) https://doi.org/10.1117/12.2025722
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal
Abstract
We report the qualitative testing of a spherical concave surface with deformation coefficients based on the null-screen principles. The design of cylindrical null screen with curved grid is described; its image, which is formed by reflection on the test surface, becomes an exact square grid if the surface is perfect. Any departure from this geometry is indicative of defects on the surface. In contrast to others tests, here the whole surface is tested at once. The surface under test is 140 mm in diameter and a radius of curvature of 97 mm. The surface is testing during the manufacturing process; departures from the design surface will be analyzed and discussed.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Manuel Campos-García, Fermín Granados-Agustín, Elizabeth Percino-Zacarías, Amilcar Estrada-Molina, Víctor Iván Moreno-Oliva, Agustín Santiago-Alvarado, and Maximino Avendaño-Alejo "Accuracy of the optical testing of a fast aspheric concave surface through null-screens", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87852Y (18 November 2013); https://doi.org/10.1117/12.2025722
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