Equipment and method for measuring slope error of optical lens

Abstract

The invention discloses equipment for measuring slope error of an optical lens. The equipment comprises an image target, an image acquisition device and an image processor, wherein the image target is manufactured according to the type of a standard lens curved surface of a detected lens; an acquisition camera lens faces towards the curved surface of the detected lens for acquiring an image formed by the image target through the curved surface of the detected lens and transmitting the acquired image to the image processor; and the image processor is used for performing contrastive analysis on the image and an image target theoretical image, calculating offset of each image point of the image, converting the offset into displacement and obtaining the slope error of each image point according to the displacement. The invention also provides a method for measuring the slope error of the optical lens. By implementing the technical scheme provided by the invention, the equipment and the method have the beneficial effects of capability of obtaining the slope error by comparing the image formed by the image target through the detected lens with the image target theoretical image, easiness in implementation, low cost and capability of keeping good accuracy.

Description

Technical field [0001] The invention belongs to the field of optical lens detection, and can be used for detecting the slope error of ordinary reflective lenses and special surface reflective lenses, and can also be used for aberration detection of transmission lenses. Background technique [0002] In the current field of solar thermal power generation, since the reflection and concentration of the lens are involved, there are certain requirements for the surface flatness of the reflecting lens. When the quality of the lens surface is poor, adverse effects such as distortion of the reflected light spot and uneven light intensity will occur, and the main lens parameter that causes this effect is the slope error of the lens. For a point on the lens, the slope error refers to the error between the theoretical direction and the actual direction of the light reflected by the point under normal incident conditions, which is an angle value. In order to avoid this situation, it is usual...

AI Technical Summary

Problems solved by technology

This method is cumbersome to measure, takes a long time, and because the slope obtained is the slope of an area, not the slope of each point, it will cause relatively large errors

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