Mirror surface object three-dimensional shape measurement method and device based on double-screen transmission display

Abstract

The invention discloses a mirror surface object three-dimensional shape measurement method and device based on double-screen transmission display. The device comprises a computer, a CCD camera, a liquid crystal display screen and a transparent display screen, wherein the CCD camera, the liquid crystal display screen and the transparent display screen are fixed on an optical platform, and the liquid crystal display screen and the transparent display screen are perpendicular to the optical platform; light paths of an image displayed on the liquid crystal display screen and an image displayed onthe transparent display screen are parallel; a horizontal guide rail is arranged on the optical platform and is perpendicular to the liquid crystal display screen; and the computer is connected with the liquid crystal display screen, the transparent display screen and the CCD camera. The method comprises the following steps: 1, establishing a measurement system; 2, removing a to-be-measured mirrorsurface object to obtain an absolute phase expansion diagram of a reference plane; 3, removing the reference plane, adding the to-be-measured mirror surface object, and obtaining the absolute phase expansion diagram of the to-be-measured mirror surface object according to the method in the step 2; and 4, solving three-dimensional morphology depth information of the to-be-measured mirror surface object.

Description

technical field [0001] The invention relates to the field of optical non-contact measurement of the three-dimensional shape of mirror objects, in particular to a method and device for measuring the three-dimensional shape of mirror objects based on dual-screen transmission display. Background technique [0002] The traditional measurement of mirror objects generally adopts the following two methods: the first one is to scan the object point by point with equipment such as a three-coordinate measuring machine. It will cause measurement errors, and there will be certain damage to the surface with high precision requirements. Another way is to change its surface reflection characteristics into diffuse reflection by spraying its surface and measure it with optical methods. Because the surface properties of the object to be measured are changed, the measurement results are inaccurate, and there are many specular objects that do not allow spraying . Both of the above two methods...

AI Technical Summary

Problems solved by technology

This method uses dual display screens to avoid error accumulation caused by gradient integration. However, due to the use of half-transparent mirrors, the incident light cannot be accurately determined during the measurement process, and the measurement field of view becomes smaller, making it impossible to measure large-sized objects, which directly affects Improved measurement accuracy and measurement field of view

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