Method and device for measuring curvature radius of lens by use of laser

Abstract

The invention discloses a method for measuring the curvature radius of a lens by use of laser. The method uses a device and comprises the following steps: horizontally placing a planoconvex lens to be measured on the edge of a groove with round inside of a mounting seat; reflecting the laser by a reflector and vertically emitting the laser onto the planoconvex lens to be measured, wherein two light beams reflected by the upper and lower surfaces of the planoconvex lens to be measured are coherent lights and form an interference Newton's ring; measuring the dark ring level k of interference fringes through a reading microscope, and measuring the diameter corresponding to the kth level dark ring at the same time; assigning k+1, k+2, k+3,..., and multiple dark rings to k through a multi-measurement method, and measuring the diameter value of corresponding dark rings; processing data by a successive difference method, and measuring the diameter values of k+m+1, k+m+2, k+m+3,... and multiple dark rings at the same time; and calculating the measured data by a formula to obtain the curvature radius of the planoconvex lens to be measured. The invention also discloses a device for realizing the measurement method. According to the method and device disclosed by the invention, the planoconvex lens to be measured does not experience stress deformation, and the measurement precision is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of applied optical equipment, and relates to a method for measuring the radius of curvature of a lens by using a laser, and also relates to a laser Newton ring measuring device. Background technique [0002] The traditional Newton ring instrument measurement method for lens curvature radius is generally composed of a lens and an optical flat glass. The Newton ring instrument is generally composed of a plano-convex lens with a large curvature radius and an optical flat glass. The sodium yellow light source of 589.3nm is used for measurement. The sodium yellow light is reflected by the reflector and then vertically incident on the Newton ring instrument, which can produce equal-thickness interference ring fringes (including bright ring and dark ring) on ​​the surface of the plano-convex lens. The dark ring is measured by the reading microscope. The ring parameter can measure the curvature radius of the plano-c...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring the radius of curvature of a lens by using a laser, which solves the problem that the plano-convex lens produces stress deformation and large measurement errors in the actual measurement of the existing Newton ring instrument measurement method

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