Method for detecting defects inside glass

Abstract

The invention discloses a method for detecting defects inside glass. The method comprises the following steps: in a dark environment, irradiating the side surface of glass to be detected by using a linearly-structured light source, wherein the defects inside the glass such as impurities and cracks can scatter a part of light, shooting from the front surface of the glass to be detected by using a high-resolution CCD (charge coupled device) camera, recording a series of images with defect information, moving the glass to a next position, shooting again, and finally obtaining defect images of all irradiated positions of the side surface of the glass to be detected. The visual field of the high-resolution CCD camera is limited, so that firstly, images in a certain layer are two-dimensionally stitched to obtain the defect images of the layer, secondly, two-dimensional coordinates and the layer number of the defects are recorded, and finally, the defect images of all layers are three-dimensionally reconstructed to obtain three-dimensional images of the defects inside the whole glass. The detection method is simple and high in detection accuracy, can accurately detect positions of the defects inside the glass such as the impurities and the cracks.

Description

technical field [0001] The invention relates to a method for detecting internal defects of glass, which is suitable for detecting internal defects of glass, optical element blanks, and other transparent materials such as plastics and crystals. Background technique [0002] During the production process of glass, due to material purity, production process and other reasons, impurities, bubbles, and even cracks and other defects will be introduced into the glass. These defects will increase the brittleness of the glass and reduce its mechanical properties. When glass with defects is used to produce optical instruments such as optical lenses, due to the generation of stray light and uneven energy absorption, the imaging quality will be reduced, and even the optical system will be damaged. Therefore, in the glass production process and product quality inspection, how to inspect and identify the defects inside the glass has become an urgent problem to be solved. At present, many...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the prior art, such as low measurement accuracy, low efficiency, and incapability of automatic detection, the present invention provides a detection method for glass internal defects. The glass is illuminated from the side by a line-structured light source, and the defect information of each layer is obtained. , and finally perform 3D reconstruction to obtain the 3D coordinates of the defects inside the glass

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