System and method for simultaneous detection of three-dimensional surface and thickness distribution of transparent materials

Abstract

The invention provides a simultaneous detection system for the three-dimensional surface and thickness distribution of transparent materials, comprising an image acquisition module, a depth sensor, a surface light source, a reference panel, a transparent material and a control unit; the image acquisition module is used to collect polarization images and depth images of the transparent material and transmitted to the control unit; the depth sensor is used to collect the front and rear depth values ​​of the transparent material; the surface light source is used to emit non-polarized white light to illuminate the transparent material; the reference panel is used to place the background pattern; the control unit includes a normal vector calculation module based on polarization characteristics, A normal vector correction module and a reconstruction and detection module based on a depth sensor; the invention can perform three-dimensional surface detection on large-area and large-thickness transparent materials, and can also detect the entire surface thickness distribution of large-area and large-thickness transparent materials, and the detection system The specific structure is simple, the cost is low, and the non-contact detection of large-area and large-thickness transparent materials can be realized.

Description

technical field [0001] The invention belongs to the technical field of industrial detection, and in particular relates to a simultaneous detection system and method for three-dimensional surface and thickness distribution of transparent materials. Background technique [0002] Three-dimensional detection of transparent material surfaces has been considered as a challenging problem. The difficulty is that most light that encounters a transparent material passes directly through the material's surface, where it is refracted. In addition, the environmental background can be imaged on the surface of transparent materials and affect the detection. The easiest solution is to spray a layer of powder or dye on the surface of the transparent material to make the surface of the transparent material opaque. But there are various disadvantages such as subsequent cleaning, and the thickness and uniformity of the surface powder or dye can easily affect the detection. [0003] Currently...

AI Technical Summary

Problems solved by technology

However, there are still uncertainties in the angle of incidence and azimuth, which have a great impact on 3D surface detection

In addition, most importantly, none of these three types of methods can detect the thickness distribution of the entire surface while detecting the three-dimensional surface of a large area and thick transparent material

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