Sorting apparatus with controllable windows and fiber optics

Details Sorting apparatus with controllable windows and fiber optics Sorting apparatus with controllable windows and fiber optics

1989-09-05

1991-02-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022711, 2503581, G01N 904

Patent

active

049946676

ABSTRACT:
Particles are conveyed in a stream in a direction transverse to the width of the stream. Windows view individual width zones of the stream and optical fibres are associated with the windows to convey light passing through a window to a light detector. The windows are rapidly opened and closed and a processor is provided to determine which window passed light detected by the detector and accordingly which width zone of the stream the light emanated from. The windows preferably incorporate liquid crystal shutters which can be switched rapidly between light-transmitting and opaque states corresponding to open and closed states of the windows.

REFERENCES:
patent: 4281765 (1981-08-01), Brazell et al.
patent: 4580684 (1986-04-01), Bohme et al.

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