Flux Leakage Measurements for Defect Characterization Using NDT Adapted GMR Sensors

被引：4
|
作者：
Pelkner, Matthias [1 ]
Neubauer, Andreas [1 ]
Blome, Mark [1 ]
Reimund, Verena [1 ]
Thomas, Hans-Martin [1 ]
Kreutzbruck, Marc [1 ]
机构：
[1] Fed Inst Mat Res & Testing, D-12205 Berlin, Germany
来源：
ELECTROMAGNETIC NONDESTRUCTIVE EVALUATION (XIV) | 2011年 / 35卷
关键词：
GMR; NDT; magnetic flux leakage; reconstruction;
D O I：
10.3233/978-1-60750-750-5-217
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
High-precision magnetic field sensors are of increasing interest in non destructive testing (NDT). In particular GMR-sensors (giant magneto resistance) are qualified because of their high sensitivity, high signal-to-noise ratio and high spatial resolution. We performed magnetic flux leakage measurements of artificial cracks with a GMR-gradiometer and a 3-axes GMR-magnetometer. Cracks of a depth of 44 mu m still could be detected with a sufficient high signal-to-noise ratio. A semi-analytic magnetic dipole model was used for swiftly predicting magnetic stray fields. The reliable reconstruction based on measurements of artificial rectangular-shaped defects is demonstrated.
引用
收藏
页码：217 / 224
页数：8
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