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Title:
DETECTION OF ANOMALIES ON RAILROAD TRACKS
Document Type and Number:
WIPO Patent Application WO2002016184
Kind Code:
B1
Abstract:
The present invention relates to a method and apparatus for detecting anomalies, defects or electromagnetic properties of electrically conductive and magnetically permeable materials by using a magnet to partially saturate the material, thereby lowering its permeability, and sending a second, higher frequency oscillating electromagnetic wave into the material. The oscillating magnetic flux field permeating into the electrically conductive material induces eddy waves. As the apparatus passes over the material, the properties of the induced eddy currents, and the corresponding magnetic flux field induced by such eddy currents, changes as the properties of the material change. These changes can be the result of defects or anomalies in the material or in connecting welds.

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Inventors:
BIJAN K AMINI
Application Number:
PCT/US2001/026710
Publication Date:
September 06, 2002
Filing Date:
August 27, 2001
Export Citation:
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Assignee:
EM TECH LLC (FR)
International Classes:
B61K9/10; B61L23/04; G01N27/90; (IPC1-7): B61K9/10; B61L23/04; G01N27/90
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