Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-12-23
1976-05-11
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 41, 194100R, G01R 3312, G07F 302
Patent
active
039566927
ABSTRACT:
A radio frequency oscillator circuit has its tuning circuit coil mounted so as to conveniently receive an object to be tested in preselected precisely defined positions proximate to the windings thereof. A "standard" metal object is placed in a predetermined position proximate to the coil windings and the oscillator activated. The output of the oscillator is detected to produce a DC which is a function of the size, shape, specific gravity and metallic content of the piece being tested. This DC output is amplified and fed to a meter. A nulling circuit is utilized to "null" the meter circuit with the "standard" or reference object in position proximate to the oscillator coil. An object to be tested is then placed proximate to the coil in precisely the same position that was formerly occupied by the "standard" and the meter observed for deviations from the "null" position. If the object to be tested is identical or closely similar in size, shape, specific gravity and metallic content to the reference, the meter deviation will be within predetermined acceptable limits, in view of the fact that the tuning of the oscillator is dependent on the size, shape, specific gravity and metallic content of the objects within the coil which affect hysteresis and eddy current losses thereof, and thus the "Q" of the circuit.
REFERENCES:
patent: 2331418 (1943-10-01), Nolde
patent: 3686563 (1972-08-01), Walter
Corcoran Robert J.
Sokolski Edward A.
Wein Products, Inc.
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