Profile testing of spherical surfaces by laser deflectometry.
Profile testing of spherical surfaces by laser deflectometry.
复制标题
通过激光偏转测量球面的轮廓测试。
作者：
M. Rosete;R. Díaz
提出了一种测量球面轮廓的方法。它包括测量当表面绕位于其曲率中心附近的轴旋转时反射的氦氖激光束的横向偏转。获得了一组公式，使我们能够计算轮廓的形状以及旋转轴的偏心。通过使用简单的实验设置，我们发现了实验配置文件与理想配置文件之间的差异；获得的精度约为 3 µm。该方法可以改进并且对于凸面和凹面都是有用的。通过较小的修改，可以测试大表面和弱非球面。
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.