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Research on the Quanitiative Assessment System about the Claddings’ Debonding Defects by Laser Holographic Test

Author: ZiPeng
Tutor: ChenMin
School: Nanchang University of Aeronautics and
Course: Optical Engineering
Keywords: Laser holographic image Process feature extraction defect identification quanitiative analysis
CLC: TN26
Type: Master's thesis
Year: 2011
Downloads: 6
Quote: 0
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Abstract


Laser holographic testing not only has a high accuracy and sensitivity, but aslo has no special requirement on the surface shape of the tested sample,and it is also recognized as the only testing method about the bonding quality of the coating grain. However currently it was only made a qualitative analysis through the traditional laser hologram testing methods,so it could not meet the quanitiative assessment requirement on the size of the defectes.The main work of this article is to reseach on the computer recognition algorithm of the bonding quality of the claddings which tested by laser Holographic and the development of the automated quantitative assessment system of the coating grain.First, as Studying the testing laboratory norms about the grain’s bonding quality tested by the double exposure method,the author have processed the collected holographic fringe picture from the experient by the digital image Processing,such as image filtering denoising、binarization and thining on the basis of the characteristics of holographic fringe image,also designed a series algorithm including image segmentation and image feature extraction for the feature of Holographic fringe image.Finally the author also have implemented a series of works as the quantitative analysis and pattern recognition to the extraction features of the defect.Meanwhile,in order to verify the effectiveness of quanitiative assessment system for detection of the defects,in this article, the author have developed a tested system which used for Holographic detection in the Vc++software.The results reveale that quanitiative system is effective and can identify size of defects.In the end,some pendent problems on holographic test in the quantitative assessment Processing were discussed.Moreover, the perspective for future works were presented.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Holography
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