Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1987-07-07
1989-07-11
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324327, 324236, G01V 308
Patent
active
048475521
ABSTRACT:
A metal body located below a metal surface layer is detected by energizing inductance coils in a bridge circuit at a frequency below 10 KHz to avoid skin effect as one of the coils is placed proximate said body. A threshold circuit determines when bridge unbalance is caused by other than the surface layer and provides positive identification of the metal body.
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Edmonds Warren S.
Eisenzopf Reinhard J.
The Boeing Company
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