Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1983-03-31
1987-04-21
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324262, G01N 2782, G01R 3312
Patent
active
046599916
ABSTRACT:
A magnetic device for nondestructively inspecting elongated objects such as wire cables and the like, for loss of metallic cross-section due to abrasion and corrosion and internal defects has magnets which induce a saturated magnetic field axially through a short section of the cable as the device and the cable move relative to one another. A sensing coil located in close proximity to the cable between the magnetic field poles detects small changes in leakage flux at the surface of the cable in the saturated condition. The sensed flux changes are applied to an integrator to measure the net variation in flux and correspondingly the total change in cross section. Multiple sense coils mounted on core pieces conforming to the external surface of the cable ensure complete continuity of the inspection process and allow the magnetic device to be installed and removed at intermediate stations along the cable.
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Meltzer et al, "New Method for Steel Cable Testing Developed at NTH", Bergverks-Nytt, 7-8/1969, pp. 13-17.
Edmonds Warren S.
Eisenzopf Reinhard J.
NDT Technologies, Inc.
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