Article or seed counter

Details Article or seed counter Article or seed counter

G - Physics

01

N

340/124.4

G01N 21/84 (2006.01) G01V 8/20 (2006.01) G06M 1/10 (2006.01) G06M 7/00 (2006.01)

Patent

CA 1238385

ARTICLE OR SEED COUNTER Abstract of the Disclosure A sensor for counting articles, such as seeds, moving through a conduit includes an array of infrared LEDs generating a uniform diffuse beam of radiation which entirely illuminates a cross sectional volume of the conduit. The beam is detected by a planar photo diode which extends across the opposite side of the conduit. A pair of mirrors extend along opposite sides of the conduit between the array and the photo diodes. Slits narrow the beam and limit the amount of radiation which can impinge upon the photo diode. The signal from the photo diode is integrated by a signal processing unit so that the sensor can count a plurality of seeds in a group of seeds which simultaneously pass through the beam. The signal processing unit automatically compensates for changes in the steady state photo-diode output and for changes in seed size.

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