Methods Of Measuring Aspherical Rotary Surfaces

G. Stuller

doi:10.1117/12.958974

13 May 1981 Methods Of Measuring Aspherical Rotary Surfaces

G. Stuller

Proceedings Volume 0235, Aspheric Optics: Design, Manufacture, Testing; (1981) https://doi.org/10.1117/12.958974
Event: Aspheric Optics: Design, Manufacture, Testing, 1980, London, United Kingdom

Abstract

A non-contacting measuring method is devised for optically polished surfaces, i.e. for surfaces with sufficient reflection. By means of precision measurement of angles and distances between two positions, apexial and normal, the parameters of aspherical surfaces are found. The surfaces are defined by the equation of the meridional section. Presupposed are rotational surfaces arising through the rotation of a conic section around its axis, which is also the optical axis of the measured componentes. In analogy with spherical optics, where first the radius defining - thanks the equation of the curve of section - every point of the surface, is measured; halfparameter and halfaxis are determined for conic sections. The local deformations are interesting only after the type of curve and the equation of section have been determined. Methods of evaluation based on known constants of the instrument are determined. The results of measurement for concrete dimensions are compared to a surface with known parameters. The comparisons are made for a convex and concave spherical surface too. The block diagram of hierarchy for conicoids is established.

Citation Download Citation

G. Stuller "Methods Of Measuring Aspherical Rotary Surfaces", Proc. SPIE 0235, Aspheric Optics: Design, Manufacture, Testing, (13 May 1981); https://doi.org/10.1117/12.958974

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