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Methods, systems and devices for detecting and locating ferromagnetic objects

United States Patent

7,652,572
January 26, 2010
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Methods for detecting and locating ferromagnetic objects in a security screening system. One method includes a step of acquiring magnetic data that includes magnetic field gradients detected during a period of time. Another step includes representing the magnetic data as a function of the period of time. Another step includes converting the magnetic data to being represented as a function of frequency. Another method includes a step of sensing a magnetic field for a period of time. Another step includes detecting a gradient within the magnetic field during the period of time. Another step includes identifying a peak value of the gradient detected during the period of time. Another step includes identifying a portion of time within the period of time that represents when the peak value occurs. Another step includes configuring the portion of time over the period of time to represent a ratio.
Roybal; Lyle Gene (Idaho Falls, ID), Kotter; Dale Kent (Shelley, ID), Rohrbaugh; David Thomas (Idaho Falls, ID), Spencer; David Frazer (Idaho Falls, ID)
Battelle Energy Alliance, LLC (Idaho Falls, ID)
11/ 539,678
20080084301
October 9, 2006
GOVERNMENT RIGHTS This invention was made with Government support under Contract DE-AC07-05-ID14517 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.