Electricity: measuring and testing – Magnetic – Displacement
Patent
1986-09-30
1989-06-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
324239, 324227, 324243, 324234, G01B 702, G01N 2772, G01R 3312
Patent
active
048375098
ABSTRACT:
A method and apparatus for measuring the overlayer of a nonmagnetic mater such as concrete and the diameter of steel reinforcement bars embedded therein. A steady state magnetic flux field is generated in the area of the concrete which is to be tested. A reinforcement bar embedded within the concrete generates a scatter field which is superimposed on the excitation field. By scanning the concrete surface, an amplitude locus is determined which is subtracted from an amplitude locus determined in the absence of ferromagnetic objects, whereby a difference locus is obtained. The concrete overlayer and the diameter of the steel reinforcement bar are determined from the location and magnitude of the maximum values of the difference locus with the aid of an evaluation computer.
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Dodmann Gerd
Fey Jochen
Fritz Christoph
Kopp Harald
Kroggel Otto
Edmonds Warren S.
Eisenzopf Reinhard J.
Fraunhofer-Gesellschaft zur Forderung der ange-wandten Forschung
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