Digital loop detector with automatic tuning

Details Digital loop detector with automatic tuning Digital loop detector with automatic tuning

1976-12-03

1978-12-26

Caldwell, Sr., John W.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

340 38L, 340551, G01R 3312, G08G 101

Patent

active

041318480

ABSTRACT:
A digital device for detecting a metal object in the field of influence of a detector loop controlled by an oscillator which device creates a series of counting intervals and counts pulses during the intervals. The magnitude of the count during an interval is then indicative of metal detected by the loop. The count of a prior counting interval is stored and compared with the count of the next interval to determine whether or not there has been a detection. In this type of device there is provided an improvement wherein the magnitude of the counts stored during an interval is used to change the length of subsequent counting intervals. This maintains a generally high count magnitude for the counting interval to improve the sensitivity of the detecting device.

REFERENCES:
patent: 3868626 (1975-02-01), Masher
patent: 3873964 (1975-03-01), Potter
patent: 3875525 (1975-04-01), Ballinger et al.
patent: 3875555 (1975-04-01), Potter
patent: 3943339 (1976-03-01), Koerner et al.
patent: 3980867 (1976-09-01), Potter
patent: 3989932 (1976-11-01), Koerner
patent: 4075563 (1978-02-01), Battle

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