Sensor device for particles in an air stream

Details Sensor device for particles in an air stream Sensor device for particles in an air stream

1990-08-06

1993-01-05

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

340627, 73 1R, 221 21, G06F 1520

Patent

active

051774704

ABSTRACT:
The blockage module is designed to be mounted on air seeder seeding equipment. Piezoelectric sensors extending into the flow tubes monitor flow by producing high frequency ringing signals when struck by seeds. During a calibration step, the module will monitor each sensor and adjust the gain of the signal until the number of seed hits per second above a fixed voltage threshold is near a predetermined value. Each sensor connected to the module will be similarly calibrated, and the calibrated gain and hit rate will be stored. It has been found that if a blockage or partial blockage occurs under these calibrated conditions, the number of hits above the fixed voltage threshold will be sharply reduced. The reduced hit rate is compared to the calibrated hit rate, and an alarm is generated if the reduction is great enough. Because the reduced hit rate is immediately detectable, the response time to report a blockage is very short.

REFERENCES:
patent: 4268825 (1981-05-01), Kaplan
patent: 4333096 (1982-06-01), Jenkins et al.

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