Curvature radius measuring method

Abstract

The invention relates to the technical field of measurement methods, in particular to a curvature radius measuring method. The curvature radius measuring method is not influenced by factory environments such as a vibration environment and the like and belongs to non-contact measurement; and by the method, a surface to be detected cannot be damaged, the requirements of quick large-scale on-site measurement can be met, and the surface curvature radiuses of polished and unpolished parts can be measured at the same time. The curvature radius measuring method provided by the invention comprises the following steps of: cutting a sphere by using two planes between which the distance is (D), wherein the (D) is less than the diameter of the sphere, and two circles are formed by intersecting lines between the two planes and the surface of the sphere; and obtaining the sum of the radiuses of the two circles by a non-contact measurement method, wherein the curvature radius of the surface to be detected is shown as a formula in the specification.

Description

technical field : [0001] The invention relates to the technical field of measurement methods, in particular to a method for measuring the radius of curvature. Background technique [0002] The radius of curvature is the main technical indicator for measuring optical parts. At present, in the field of optical processing, the main methods for testing the radius of curvature of optical parts are divided into two categories: contact method and non-contact method measurement. Among them, contact method measurement methods mainly include spherometers and samples. Two, the spherometer calculates the radius of curvature of the concave or convex surface of the measured part by testing the sagittal height and length of the concave or convex surface of the part. In the measurement process of this method, it is necessary to seek the maximum point / minimum point of the vector height, and the probe needs to slide on the surface of the part, which is likely to cause damage to the surface ...

AI Technical Summary

Problems solved by technology

The autocollimating microscope method is to aim at the vertex and the center of the sphere of the surface to be measured successively, and obtain the difference between the two aimed geometric positions, which is equal to the radius of curvature of the surface to be measured, although the measurement is non-contact, but During the measurement, it is necessary to find the center of the sphere of the surface to be measured (there is only one center of the sphere, which needs to be accurately placed on the optical axis of the autocollimating microscope), which takes a long time to find, so it is not suitable for rapid batch inspection on site, and parts The surface to be measured needs to be polished before using this method to measure, otherwise no autocollimation image can be found

Interferometer measurement requires an expensive workbench, and the equipment itself is expensive. It requires a polished mirror surface on the surface to be tested. The test is obviously affected by vibration and is not suitable for the working environment on site.

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