Method of detecting opaque foreign article from among transparen

Details Method of detecting opaque foreign article from among transparen Method of detecting opaque foreign article from among transparen

1990-08-10

1992-03-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, G01N 904

Patent

active

051011018

ABSTRACT:
A method of detecting an opaque foreign article from among transparent bodies which assures a distinct difference between detection signals originating from a transparent body and an opaque foreign article and a high S/N ratio in such detection signals and is improved in accuracy in detecting operation. The method comprises the steps of scanning, while an object for the detection which may be one of transparent bodies or an opaque foreign article existing in such transparent bodies is being moved, the object for the detection by a beam of linearly polarized light, and detecting reflected light from the object for the detection upon each scanning using an optical sensor such as a charge coupled device camera by way of a polarizing filter.

REFERENCES:
patent: 3197647 (1965-07-01), Fraenkel
patent: 4730932 (1988-03-01), Iga et al.

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