Foreign object detecting method and device

Details Foreign object detecting method and device Foreign object detecting method and device

1990-09-06

1991-12-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356427, G01N 904

Patent

active

050721089

ABSTRACT:
A foreign object detecting method and device are for detecting foreign objects mixed in a liquid filling a transparent container. The foreign object detecting method comprises the first step of keeping for a set period of time the transparent container rotated in a first rotational direction, the second step of rotating the transparent container in a second rotational direction opposite to the first rotational direction; the third step of taking a transmitted light image of the transparent container while the liquid in the transparent container is substantially stopped after a set period of time from the start of the rotation of the transparent container in the second rotational direction; and the fourth step of scanning the taken transmitted light image along the rotational directions to detect the foreign objects in the liquid based on a difference in brightness between at least two points on a scanning line. Thus the foreign objects mixed in the liquid can be detected discriminately from the flaws and smears of the transparent bottle per se.

REFERENCES:
patent: 3528544 (1970-09-01), Noguchi et al.
patent: 3811567 (1974-05-01), Tomita et al.
patent: 4095904 (1978-06-01), Klein et al.
patent: 4241256 (1980-12-01), Tagaya et al.
patent: 4636635 (1987-01-01), Kronseder
patent: 4680463 (1987-07-01), Lutgendorf et al.

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