Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1976-05-13
1978-02-21
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
340 38L, G01R 3312
Patent
active
040755630
ABSTRACT:
An improvement in a digital device for detecting a metal object in the field of influence of an oscillator controlling loop, which digital device includes counter means for counting pulses during a counting interval, with the magnitude of the pulse count during the interval being indicative of the metal detected by the loop. The improvement includes means for creating a group of binary logic signals indicative of the difference between the pulse count and a selected reference count, these signals are allocated from a least significant to a more significant binary number, and reading means for reading the logic of at least some of the binary logic signals, which reading device includes means for indicating a detection when the signal being read has a selected binary logic pattern.
REFERENCES:
patent: 3196262 (1965-07-01), Thompson
patent: 3680046 (1972-07-01), Bergey et al.
patent: 3868626 (1975-02-01), Masher
patent: 3873964 (1975-03-01), Potter
patent: 3875555 (1975-04-01), Potter
patent: 3943339 (1976-03-01), Koerner et al.
patent: 3989932 (1976-11-01), Koerner
Brackney et al. Pulse Comparator Circuit Messures Freq. Jitter, Electronics, July 7, 1961; pp. 54-56.
Corcoran Robert J.
Gulf & Western Industries, Inc.
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