Detector for rod-like articles

Details Detector for rod-like articles Detector for rod-like articles

1987-01-12

1988-10-04

Tokar, Michael J.

Measuring and testing

Vibration

By mechanical waves

198524, 209536, G01N 2900

Patent

active

047748400

ABSTRACT:
The position of a rod-like article of the tobacco industry is detected by measuring the delay in receiving sound transmitted towards and reflected from the article. In a preferred arrangement a stack level detector comprises a transmitter (22) for pulsed ultrasound (above 20 kHz), a receiver (24) and a circuit (10) for measuring the delay. The circuit (10) may include a latch (30) which generates regular pulses having duration corresponding to the delay.

REFERENCES:
patent: 3596797 (1971-08-01), Wallenborn
patent: 3985030 (1976-10-01), Charlton
patent: 3995732 (1976-12-01), Figes et al.
patent: 4344520 (1982-08-01), Czoch et al.
patent: 4528651 (1985-07-01), Brock et al.
patent: 4564018 (1986-01-01), Hutchison et al.
patent: 4578997 (1986-04-01), Soltz

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