Registers – Platform operated – Platform actuated traffic counters
Patent
1978-11-08
1981-01-20
Thesz, Joseph M.
Registers
Platform operated
Platform actuated traffic counters
111 1, B65G 5136
Patent
active
042464692
ABSTRACT:
A microwave seed sensor produces an output signal in response to the passage of each seed through a seed planting tube or conduit forming a path of travel for seeds, as in a seed planting machine. The microwave seed sensor comprises a housing of predetermined dimensions defining a waveguide for supporting propagation of a standing wave pattern of predetermined order at a predetermined microwave frequency. The housing includes a tubular portion for receiving the seed conduit, so that the seed conduit and waveguide intersect to define a seed viewing area where the path of travel in the conduit is in registry with the waveguide. This seed viewing area is of predetermined dimension in the direction of the path of travel of seeds through the conduit for resolution of individual seeds by the microwave seed sensor so that seeds may be counted. The predetermined dimensions of the seed sensor housing are such that the microwave energy is substantially confined within the waveguide, preventing any leakage of microwave energy into the seed conduit, except in the seed viewing area.
REFERENCES:
patent: 3537091 (1970-10-01), Schenkenberg
patent: 3723989 (1973-03-01), Fathauer et al.
patent: 3881353 (1975-05-01), Fathauer
patent: 3883798 (1975-05-01), Free
patent: 3928751 (1975-12-01), Fathauer
patent: 3964041 (1976-06-01), Hinds
patent: 4012622 (1977-03-01), Boys
patent: 4054779 (1977-10-01), Wilke
L. W. Hrubesh, "A Simplified Microwave Instrument for Measuring Particle Volumes and Densities", Rev. Sci. Instrum., vol. 45, No. 1, Jan. 1974, pp. 125-126.
Dickey-john Corporation
Thesz Joseph M.
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