Detection of anomalies on railroad tracks
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 29, 2003
Grant Date -
Mar 21, 2002
app pub date -
Aug 27, 2001
filing date -
Aug 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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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