Process and device for detecting foreign bodies in a liquid

Details Process and device for detecting foreign bodies in a liquid Process and device for detecting foreign bodies in a liquid

1983-01-31

1986-08-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356427, G01N 904

Patent

active

046058516

ABSTRACT:
The invention relates to a process and device for detecting foreign bodies in a liquid, wherein the image of the apparent surface of the liquid in rotation in the immobilized recipients is formed, by reflection, diffraction, refraction or attenuation of the light coming from a source, on a matrix of reception and read cells. In the matrix each cell is perfectly delimited and its position is identified by numerization. A series of images is produced, of which a certain number are taken as reference and memorized. Each image is digitized and those images following the last memorized image is compared therewith cell by cell by a subtractor.
The results of such a subtraction are compared with a threshold and results overstepping the threshold involve delivering a signal to a processor which controls a sort device arranged to eliminate undesirable units.

REFERENCES:
patent: 3859518 (1975-01-01), Sander
patent: 4204230 (1980-05-01), Sprague
patent: 4281354 (1981-07-01), Conte

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