IEEE Transactions on Applied Superconductivity · 1993 · 12 citations · 5 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsElectromagnetismMagnetic MaterialsElectron Paramagnetic ResonanceFerromagnetismMagnetic CharacterizationMagnetic SensorsSurface MagnetismMagnetic Field SensingMagnetic Field StrengthMagnetic Property MeasurementMagnetometer InstrumentationNoise SensitivityNondestructive EvaluationSensitivitySquid Magnetometers
A nondestructive evaluation (NDE) surface-flaw detection technique involving decoration of the samples with a ferromagnetic or paramagnetic tracer and subsequent scanning with a high-resolution magnetometer or susceptometer is considered. The authors present the results of a preliminary study demonstrating that this technique is sensitive enough to detect and image defects at least as small as 254 mu m*51 mu m*76 mu m deep in a nickel-alloy test block. Applied field strength and superconducting quantum interference device (SQUID) noise limit sensitivity, and sensing coil characteristics limit spatial resolution.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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