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Proceedings Paper

Surface defect inspection for power inductor
Author(s): Chun-Li Chang; Wen-Hong Wu; Chun-Jen Chen; Hung-Ji Huang
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Paper Abstract

The core of the power inductor is made by powder metallurgy. By its nature, the powder-formed part has inherent nonuniform porosity pattern and parallel tool marks on the metal surface. In the past, the surface inspection of core is usually performed by using human eyes. However, the larger uncertainty of inspection will be induced while observing the defect image using human eyes. In the automated optical inspection process, the feature of defect is not easily separated from the image background by using the simple binarization method. This study develops an image processing method and employs a uniform diffuse illumination to build up a surface defect inspection system. Experiment result shows the distinguish rate is 95.5%, therefore it is clear that this system can successfully detects a set defect of the core of inductor.

Paper Details

Date Published: 22 June 2013
PDF: 6 pages
Proc. SPIE 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 87693F (22 June 2013); doi: 10.1117/12.2019346
Show Author Affiliations
Chun-Li Chang, Instrument Technology Research Ctr. (Taiwan)
Wen-Hong Wu, Instrument Technology Research Ctr. (Taiwan)
Chun-Jen Chen, Instrument Technology Research Ctr. (Taiwan)
Hung-Ji Huang, Instrument Technology Research Ctr. (Taiwan)

Published in SPIE Proceedings Vol. 8769:
International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013)
Chenggen Quan; Kemao Qian; Anand Asundi, Editor(s)

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