Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1993-06-21
1995-10-24
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324227, 324243, G01N 2790, G01N 2772, G01N 2782
Patent
active
054613132
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 inducing eddy currents into the object, families of cracks, such as caused by environmental conditions, can be detected. In addition, magnetic flux leakage methods can be used in combination with the transient electromagnetic method to further assisting detecting crack families in pipeline inspection applications.
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Bohon William M.
Lara Pedro F.
Atlantic Richfield Company
Mantooth Geoffrey A.
O'Shea Sandra L.
Phillips Roger C.
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