Signal to noise ratio improvement for rip detectors

Details Signal to noise ratio improvement for rip detectors Signal to noise ratio improvement for rip detectors

1981-06-22

1984-05-08

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

198856, 198502, G08B 2100

Patent

active

044478070

ABSTRACT:
The frequency of the AC signal used to detect the integrity or lack of same in a conveyor belt is reduced to be in the 25 KHz. to about less than 200 KHz. and most preferably in the 50 KHz. to 100 KHz. frequency range. When such AC signals are capacitively coupled to antennas carried by a conveyor belt past a rip detector station, the ratio of the magnitude of such signal relative to that of the cross coupled noise, in particular, and other electrical noise in general is significantly increased. The invention relates to an apparatus and method in which signals in such frequency range are used.

REFERENCES:
patent: 3636436 (1972-01-01), Kurauchi et al.
patent: 3651506 (1972-03-01), Olaf et al.
patent: 3792459 (1974-02-01), Snyder
patent: 4229735 (1980-10-01), Houck

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