PROCESS AND DEVICE FOR DETECTING FOREIGN BODIES IN A LIQUID

摘要

Process and device for detecting foreign bodies in a liquid 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 numerisation. A serie of images is produced, of which a certain number are taken as reference and memorized. Each image following the last memorized image is compared therewith cell by cell by a subtractor 15. The results of such a subtraction are compared with a threshold and results overstepping the threshold involve delivering a signal to a processor 12 which controls a sort device. Figure