Method and apparatus of diagnosing deterioration of an article

Details Method and apparatus of diagnosing deterioration of an article Method and apparatus of diagnosing deterioration of an article

2005-02-08

2005-02-08

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S225000, C356S237100, C356S364000

Reexamination Certificate

active

06852992

ABSTRACT:
Light having polarization is irradiated onto an article, and then quality of the article is diagnosed using a pre-input correlation function between quality of the article and a variation of polarization of the light reflected from the article. Further, the quality of the article is diagnosed by measuring a reflection absorbance difference or a reflection absorbance ration of light from the article between two wavelenghts, and by measuring a depolarization degree of polarized light of the reflected light from the surface of the article. The quality of the article can be non-destructively diagnosed using a simple system. Further, defects can be identified of factor-by-factor basis.

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T. Ikeda et al, “Development of the Ultrasonic Degradation Tester for Low Voltage Cables”, Transactions of the Institute of Electrical Engineers of Japan, vol. 120-B, No. 11, pp. 1437-1442, 2000.

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