Device for objective checking for foreign bodies in optically tr

Details Device for objective checking for foreign bodies in optically tr Device for objective checking for foreign bodies in optically tr

1976-05-19

1978-06-20

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250576, G01N 2124

Patent

active

040959040

ABSTRACT:
The device is based on an optical transmission arrangement in which a signal change occurs when a foreign body is present in the liquid. By means of a rotating device the cylindrical container to be tested is set in rotation and subsequently braked. Then optical testing is carried out. The light beams passing through the container are picked up by a plurality of photo electric detectors arranged above one another. The photodetectors are divided into groups, which are each switched on sequentially be a programme control unit from top to bottom to effect the measurement, with one photodector group being switched on when the vortex of liquid occurring as a result of the container rotation has subsided after the standstill of the container and disappeared from the field of view of the photodector group.

REFERENCES:
patent: 2791696 (1957-05-01), Schell
patent: 3415997 (1968-12-01), Vinzelberg et al.
patent: 3942897 (1976-03-01), Takahashi et al.
patent: 3966332 (1976-06-01), Knapp et al.

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