Subsurface examination of non-ferrous material for detecting cor

Details Subsurface examination of non-ferrous material for detecting cor Subsurface examination of non-ferrous material for detecting cor

1995-05-24

1996-07-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

73 86, 324 712, 324226, 324232, 324238, 324262, G01N 2782, G01N 1700, G01N 2772

Patent

active

055325890

ABSTRACT:
A magnetic field generator positioned externally of a non-ferrous metallic tructure being examined, is rotated at a relatively low speed to produce a rotating magnetic field penetrating the metallic structure to a selected depth as a function of spacing between magnetic poles of the generator parallel to a planar surface of the metallic structure. Traction between the metallic structure and the magnetic field accompanying its rotation is measured. Corrosion of the metallic structure at subsurface depths is detected and quantified from such traction measurements.

REFERENCES:
patent: 2467306 (1949-04-01), Habig
patent: 3056920 (1962-10-01), Herrald
patent: 3109139 (1963-10-01), Branker
patent: 4379261 (1983-04-01), Lakin
patent: 4445089 (1984-04-01), Harrison
patent: 4866383 (1989-09-01), Taliaferro

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