A method for testing the profiles of spherical surfaces is presented. It consists of measuring the transversal deflection of a reflected He–Ne laser beam when the surface is rotated around an axis located near its center of curvature. A set of formulas that enables us to calculate the shape of the profile as well as the decentering of the rotation axis is obtained. By using a simple experimental setup, we found the differences between the experimental profile with respect to the ideal one; the accuracy that was obtained is ~3 μm. The method may be improved and is useful for convex as well as for concave surfaces. With minor modifications it is possible to test large surfaces and weak aspherics.
© 1993 Optical Society of America
Original Manuscript: December 26, 1991
Published: September 1, 1993
Martha Rosete-Aguilar and Rufino Díaz-Uribe, "Profile testing of spherical surfaces by laser deflectometry," Appl. Opt. 32, 4690-4697 (1993)