Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1997-09-18
2000-11-21
Patidar, Jay M.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324235, 324225, 324252, G01N 2782, G01R 3309
Patent
active
061508098
ABSTRACT:
An apparatus and method for detecting defects in electrically conductive materials. A detection method and apparatus are provided for using applied magnetic fields to induce magnetic fields in the material under test, and then directly detecting changes in the induced magnetic field attributable to corrosion, cracks, flaws, or anomalies in the material under test. The invention features the use of one or more giant magnetoresistance sensors to detect directly the changes in the induced magnetic field, which changes provoke a response in the giant magnetoresistance sensors in the form of a change in resistance signal. The apparatus may be configured in various ways, including absolute field detection and differential field detection configurations, with either passive or active field compensation, and single sensor or multiple sensor arrays. A plurality of giant magnetoresistance sensors may be disposed upon a single substrate, or on multiple substrates. The invention includes method for performing detection by use of giant magnetoresistance.
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Jarratt, Jr. Raymond L.
Tiernan Timothy C.
Baker Rod D.
Patidar Jay M.
TPL, Inc.
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