A - Human Necessities – 01 – D
Patent
A - Human Necessities
01
D
130/19, 349/37
A01D 45/30 (2006.01) A01C 7/10 (2006.01) A01D 41/127 (2006.01) G01H 1/00 (2006.01)
Patent
CA 1048630
ABSTRACT OF THE DISCLOSURE A grain flow rate monitor having a high sensitivity for the detection of seed loss in the chaff ejected from a thresher, which may be used for monitoring heavy or light seed grains. The monitor includes an acousto-electric sensor upon which the chaff impinges to produce a wide frequency spectrum signal. This signal is passed through two or more band pass filters which are centered at predetermined fre- quencies. When two filters are utilized, they will each have a predetermined bandwidth, one of which is contained in the 0 to 25 kHz range and the other contained in the 25 to 100 kHz range. The filter outputs are coupled to detectors for detecting either the peak amplitudes in each band or the average amplitude. These detector amplitudes are compared in a comparator to determine whether the ratio of their magnitudes fall within a predetermined ratio range which is indicative of a seed striking the sensor. The comparator thus provides output pulses related to seed strikes which are recorded and/ or displayed for the thresher operator.
261900
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