Method and apparatus for the measurement of plant density for th

Details Method and apparatus for the measurement of plant density for th Method and apparatus for the measurement of plant density for th

1979-02-12

1980-10-21

Hirsch, Paul J.

Harvesters

Motorized harvester

With condition-responsive operation

56DIG15, A01D 4500, A01D 7502

Patent

active

042286360

ABSTRACT:
The density of plant growth in front of a harvester machine is measured, to control the operating rate of the machine, by producing an ultrasonic field immediately forward of the cutters on the machine, which field comprises at least one ultrasonic beam of frequency modulated ultrasonic impulses. The apparatus employed comprises two transducers consisting respectively of an ultrasonic transmitter and an ultrasonic receiver respectively located on opposite sides of the machine immediately forward of the cutting blades and oriented on a line therebetween disposed orthogonally to the direction of travel of the machine, and at least one further ultrasonic transducer disposed adjacent one of said two transducers but oriented on a line relative to the other of said two transducerswhich line is inclined relative to the direction of travel of the machine.

REFERENCES:
patent: 2746230 (1956-05-01), Reimer
patent: 3094693 (1963-06-01), Taylor
patent: 3563013 (1971-02-01), Elfes
patent: 3583514 (1971-06-01), Taylor
patent: 3593720 (1971-07-01), Botterill et al.
patent: 3606742 (1971-09-01), Wieneke
patent: 3797208 (1974-03-01), Strubbe
patent: 3935866 (1976-02-01), Northrup
patent: 3939846 (1976-02-01), Drozhzhin et al.
patent: 3972381 (1976-08-01), Gail

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