Inspecting a conductive object with a steady state magnetic fiel

Details Inspecting a conductive object with a steady state magnetic fiel Inspecting a conductive object with a steady state magnetic fiel

1993-06-21

1997-09-23

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324232, 324240, G01N 2772, G01N 2782, G01R 3312

Patent

active

056708785

ABSTRACT:
There is provided a transient electromagnetic method and apparatus for inspecting objects. The apparatus includes a sensing portion, which has a transmitting antenna and at least one receiving antenna thereon. The sensing portion is located adjacent to the object which is to be inspected such that the antennas are adjacent to the object. There is also a magnet located adjacent to the sensing portion. The magnet has poles located adjacent to the object, so as to provide a steady-state magnetic field to the object. By applying a steady-state magnetic field to the object during inspection, increased inspection speeds and improved spatial resolutions can be achieved. In addition, casing can be inspected from inside of tubing.

REFERENCES:
patent: 2346830 (1944-04-01), De Lanty
patent: 4188577 (1980-02-01), Mhatre et al.
patent: 4990851 (1991-02-01), Spies
patent: 5038107 (1991-08-01), Gianzero et al.

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