Permeameter having a differential transformer probe with a reduc

Details Permeameter having a differential transformer probe with a reduc Permeameter having a differential transformer probe with a reduc

1991-03-04

1992-04-07

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324222, 324225, 324233, G01N 2772, G01R 3312

Patent

active

051031736

ABSTRACT:
Permeameter suited for measuring permeability of a small, non-magnetic (i.e., the permeability value is close to 1) object. The probe of the permeameter is of the differential transformer type with an exciting coil and two detecting coils placed at both ends of the exciting coil. The difference in the outputs of the detecting coils is analyzed and the effect of the eddy current is effectively eliminated, whereby the signal representing the permeability of the object is extracted from the difference signal by the phase shift analysis. By reducing the distance between the two detecting coils, the influence of the disturbance of the eddy current at the boundary of the object sample is minimized and the permeameter can measure a small object sample without sacrificing accuracy and sensitivity.

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