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Experimental Data for Locating VSM Pickup Coils and Minimizing the Image Effect

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2 Author(s)
Lorenz, B.E. ; Dept. of Electr. Eng., Widener Univ., Chester, PA, USA ; Graham, C.D.

From measurements of the magnetic field produced in the air gap of an electromagnet by a small permanent magnet sample, we can predict the relative sensitivity of a vibrating-sample magnetometer (VSM) for any practical location of the pickup coils. By repeating the measurements with the pole pieces removed, we can simulate the case of complete magnetic saturation (permeability μ = 1) of the pole pieces, and thus predict the relative magnitude of the image effect for any coil location. Under some conditions, a coil position can be chosen that eliminates the image effect.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )