Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-01-16
2000-07-25
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
377 6, G01V 904
Patent
active
060939265
ABSTRACT:
An optical particle flow monitoring system for monitoring particle flow through the primary and/or secondary tubes of an air dispensing system, such as an air seeder. The primary tubes include a particle sensor having at least one emitter lens body, which forms a substantially uniform, collimated beam which illuminates a sensing area in a seed tube in order to accurately monitor the number of particles flowing in the seed tube. In the preferred embodiment, optical fibers connect the emitter lens bodies to optical beam generating devices, and connect respective receiver lens bodies to optical beam detecting devices, with both the optical beam generating devices and the optical beam detecting devices being located remotely from the seed tubes for improved immunity to static electricity discharge. All the particles flowing in the secondary seed tubes associated with a given primary tube may be counted by a particle sensor located on the primary tube, thus greatly decreasing the number of sensors and the amount of data processing required to determine the total number of particles dispensed by the secondary tubes of the air dispensing system.
REFERENCES:
patent: 3723989 (1973-03-01), Fathauer et al.
patent: 3828173 (1974-08-01), Knepler
patent: 5847389 (1998-12-01), Mertins et al.
patent: 5883383 (1999-03-01), Dragne
Reid et al.; A Photoelectric Seed Counting Detector; J. agric. Engng Res.; 1976; pp. 213-215.
Batcheller Barry D.
Bramel Paul R.
Mertins Karl-Heinz O.
Wanner Jason J.
Arnold Bruce Y.
Deere & Company
Le Que T.
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