Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1975-10-02
1976-11-30
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 34R, G01R 2714
Patent
active
039952134
ABSTRACT:
The permeability and resistivity of metal sheets including those installed in enclosing structures, are nondestructively determined by injecting a unit-step pulse of current into an exposed surface of the sheet and measuring the surface voltage gradient between a pair of contacts located between the current injection contacts. The permeability and resistivity of the metal determines the rate of diffusion of current into the surface and therefore the rate of decrease of this surface voltage gradient. At steady-state the current density will be uniform throughout the thickness of the sheet resulting in the surface voltage gradient stabilizing at a value depending on the resistivity and thickness of the metal.
REFERENCES:
patent: 2735754 (1956-02-01), Dravnieks
patent: 2828467 (1958-03-01), Stauffer
patent: 3456186 (1969-07-01), Bush et al.
patent: 3464007 (1969-08-01), Williams
patent: 3611125 (1971-10-01), Sharon et al.
patent: 3636441 (1972-01-01), Fujimura
patent: 3721897 (1973-03-01), Edling
Madle Peter J.
Robinson Wesley A.
Duncan Robert Kern
Krawczewicz Stanley T.
Rusz Joseph E.
The United States of America as represented by the Secretary of
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