Method and apparatus for measuring parameters of a conductive ma

Details Method and apparatus for measuring parameters of a conductive ma Method and apparatus for measuring parameters of a conductive ma

1975-01-13

1977-02-01

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 40, G01R 3312

Patent

active

040064050

ABSTRACT:
A method and apparatus for making measurements of an electrically conductive material, which measurements can be used to determine the separate parameters thickness and conductivity without knowledge of the value of either of these parameters and in a manner giving improved freedom from sheet flutter, in which a transmitter coil is placed on one side of the sheet of material to be measured and a receiver coil on the other side at fixed distance from the transmitter coil and the transmitter coil is operated at two separate frequencies to obtain two relative phase relationships between the current in the transmitter coil and the electromotive force in the receiver coil such that the resulting phases differ in their functional relationships to thickness and conductivity, the frequency and phase being measured to obtain values which then can be used in independent equations to solve for at least one of thickness and conductivity.

REFERENCES:
patent: 3693075 (1972-09-01), Forster
patent: 3764897 (1973-10-01), Greenwood
Dodd, C. V., Applications of a Phase Sensitive E. C. Instrument Mat. Eval., June 1964, pp. 260-262 and 272.
McMaster, R., Nondestructive Testing Handbook, vol. II, The Ronald Press, 1963, pp. 39.12-39.19.

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