Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2003-06-03
2008-08-12
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S202000, C324S242000
Reexamination Certificate
active
07411390
ABSTRACT:
For the inspection of materials and the detection and characterization of hidden objects, features, or flaws sensors and sensor arrays are used to image form two-dimensional images suitable for characterizing the hidden features. Magnetic field or eddy current based inductive and giant magnetoresistive sensors may be used on magnetizable and conducting materials, while capacitive sensors can be used for dielectric materials. Enhanced drive windings and electrode structures permit nulling or cancellation of local fields in the vicinity of the sense elements to increase sensor sensitivity. The addition of calibration windings, which are not energized during measurements, allows absolute impedance and material property measurements with nulled sensors. Sensors, sensor arrays, and support fixtures are described which permit relative motion between the drive and sense elements. This facilitates the volumetric reconstruction of hidden features and objects.
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Goldfine Neil J.
Schlicker Darrell E.
Shay Ian C.
Washabaugh Andrew P.
Aurora Reena
Hamilton Brook Smith & Reynolds P.C.
JENTEK Sensors, Inc.
Whittington Kenneth J
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