Differential Technique For Accurately Measuring The Radius Of Curvature Of Long Radius Concave Optical Surfaces

Mark C. Gerchman; George C. Hunter

doi:10.1117/12.957839

25 December 1979 Differential Technique For Accurately Measuring The Radius Of Curvature Of Long Radius Concave Optical Surfaces

Mark C. Gerchman, George C. Hunter

Author Affiliations +

Proceedings Volume 0192, Interferometry; (1979) https://doi.org/10.1117/12.957839
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

Abstract

Described is a technique for accurately measuring the radius of curvature of very long radius concave optical surfaces in a relatively short working length. Presented is the basic theory of the technique and the detailed information necessary to provide for its practical application. Using the technique, radii of up to 175 meters can be measured to an accuracy of better than 0.01 percent with a one-meter long scale and slide, and in an overall working length of less than 5 meters. Generalizations of the technique allow for the measuremt of convex surfaces and even longer radius concave surfaces. Photographs, interferograms, calculations, and an error analysis illustrate the technique.

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Mark C. Gerchman and George C. Hunter "Differential Technique For Accurately Measuring The Radius Of Curvature Of Long Radius Concave Optical Surfaces", Proc. SPIE 0192, Interferometry, (25 December 1979); https://doi.org/10.1117/12.957839

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