Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1984-09-10
1987-01-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223R, G01V 904
Patent
active
046348557
ABSTRACT:
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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patent: 4163507 (1979-08-01), Bell
Dharia Vijay M.
Friend Kenneth D.
Deere & Company
Messinger Michael
Nelms David C.
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