Best-Fit Sphere Approximation to a General, Aspheric Surface
Applied Optics, Vol. 5, Issue 2, pp. 319-319 (1966)
http://dx.doi.org/10.1364/AO.5.000319
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Abstract
In manufacturing an aspheric lens or mirror, it is often convenient to generate a spherical surface as a starting point. The radius of the sphere should be such that the volume of glass which must be removed to achieve the final aspheric is a minimum. Equations for this best-fit sphere are developed and arranged in a form well suited for computer programming.
Citation
Theodore W. J. Unti, "Best-Fit Sphere Approximation to a General, Aspheric Surface," Appl. Opt. 5, 319-319 (1966)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-5-2-319
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