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Proceedings Paper

Defects scattering imaging system of 20 inch PMTs' glass shell suitable for digital image processing
Author(s): Min Lu; Zhi le Wang; Hualin Wang; Feng Zhao; Jingqi Liu; Sen Qian; Yao Zhu
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Paper Abstract

The defects in the 20 inch PMTs’ glass shell is very harmful for the stress distribution of the whole body and reduce the its lifetime. In this paper, we develop a digital image processing for the detection of 20 inch PMTs’ glass shell, which can detect defects in hollow ellipsoid surface of the PMTs’ glass shell with large aperture. The theory and the final system is showed in this paper, we use a telecentric system with a fixed working distance, a special cylindrical long optic illuminator is placed in the center position of the glass shell, and illuminate the detected surface with uniform intensity light. The image system is placed in a specially made elliptical guideway with the same shape of the glass shell, which is suitable for digital image processing. Finally, by the process of classification and statistics of surface defects ,we can get the result, the defects of the 20 inch PMTs’ glass shell can be examined with a resolution of micron, and the discrimination, classification, accuracy and the detection speed can meet the required indicators.

Paper Details

Date Published: 12 December 2018
PDF: 10 pages
Proc. SPIE 10847, Optical Precision Manufacturing, Testing, and Applications, 108470C (12 December 2018); doi: 10.1117/12.2504289
Show Author Affiliations
Min Lu, Harbin Institute of Technology (China)
Zhi le Wang, Harbin Institute of Technology (China)
Hualin Wang, Harbin Institute of Technology (China)
Feng Zhao, Harbin Institute of Technology (China)
Jingqi Liu, Harbin Institute of Technology (China)
Sen Qian, Institute of High Energy Physics (China)
Yao Zhu, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 10847:
Optical Precision Manufacturing, Testing, and Applications
John McBride; JiuBin Tan; Sen Han; Xuejun Zhang, Editor(s)

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