| CPC A01D 41/1276 (2013.01) [A01D 41/1272 (2013.01); A01F 12/444 (2013.01); A01F 12/448 (2013.01); G01P 5/242 (2013.01)] | 15 Claims |
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1. A grain cleaning system comprising:
a screening apparatus having a duct;
an upper sieve and a lower sieve disposed in the duct;
a fan arranged to generate a cleaning airstream through the duct;
an impact sensor mounted in the duct above the upper sieve and comprising an impact-sensing surface facing in an upstream direction with respect to the cleaning airstream, wherein the impact sensor is configured to transduce impact events and generate impact signals therefrom;
an electronic control unit (ECU) that is in communication with the impact sensor, wherein the ECU is configured to generate control signals based upon a particle energy value determined from the impact signals; and
an ultrasonic sensing device comprising:
a transmitter configured to transmit a base signal through the cleaning airstream; and
a receiver configured to transduce a reflected signal reflected off of airborne particles in the cleaning airstream,
wherein the ECU is in communication with the ultrasonic sensing device, and
wherein the ECU is configured to determine a Doppler frequency from a frequency of the base signal and a frequency of the reflected signal, and determine a velocity value for the airborne particles from the Doppler frequency.
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