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Comparison of surface H-field measurements using Hall sensors and a novel multiple sense coil approach

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3 Author(s)
O. Hovorka ; Dept. of Civil & Mater. Eng., Illinois Univ., Chicago, IL, USA ; G. M. Lloyd ; M. L. Wang

Resulting from the magnetoelastic phenomena, measurement of magnetic properties of ferromagnetic materials has found many applications in evaluation of stress and force. Therefore a reliable way of measuring magnetic field is imperative. Measurements of initial magnetization curve and hysteretic curve using three Hall sensors placed at different distances from the surface of the material are compared with a three point quadratic fit which was used to find the magnetic intensity at the surface of the material. The thus obtained hysteretic curve is in excellent agreement with the reference data obtained by a coil with an iron yoke. Two concentric coils are presently used in solenoid-type sensors for estimation of magnetic characteristics. The measured hysteresis curve is compared with the more precise technique employing Hall effect sensors. This work is considered to be an important step in the experimental investigation of magnetoelastic phenomena and for further development of stress sensors.

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Sensors, 2002. Proceedings of IEEE  (Volume:2 )

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