Electricity: measuring and testing – Magnetic – Hysteresis or eddy current loss testing
Patent
1975-09-19
1978-02-14
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
Hysteresis or eddy current loss testing
324 62, 324225, G01R 3312
Patent
active
040741869
ABSTRACT:
Conductivity measuring instruments are provided in which a test coil is supplied with alternating current and a detector responds to the voltage across the test coil to develop an analog voltage which is applied to a linearization circuit to develop an output voltage as a linear function of conductivity, the output voltage being applied to a digital read-out unit. As a function of conductivity, the analog voltage is single-valued, preferably with no more than a gradual slope change over a wide range of conductivity values. In one embodiment, a high impedance is provided in series with the test coil, the detector is a phase detector operated to respond primarily to the inductive component and linearization circuit is of a diode-function type. Alternatives are in the use of a phase-to-voltage type of detector and in the use of a digital type of detector and in the use of a digital type of linearization circuit.
REFERENCES:
patent: 3244977 (1966-04-01), Folsom
patent: 3255405 (1966-06-01), French
patent: 3444460 (1969-05-01), Penney, Jr.
patent: 3568044 (1971-03-01), Elazar
patent: 3936734 (1976-02-01), Brandli et al.
Corcoran Robert J.
Magnaflux Corporation
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