Apparatus and methods for measuring permeability and conductivit

Details Apparatus and methods for measuring permeability and conductivit Apparatus and methods for measuring permeability and conductivit

1993-05-14

2000-12-12

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324239, 324243, G01N 2772, G01R 3312

Patent

active

RE0369861

ABSTRACT:
Devices and analytical techniques are disclosed for measuring spatial profiles of complex permeability and conductivity of a material by multiple wavenumber interrogations. Coil array structures are disclosed which define a number of different fundamental wavelengths (or wavenumbers). Spatially periodic interrogation signals (of temporal frequency ".omega.") from the coil array structures are attenuated by varying degrees in the material undergoing analysis, depending on the wavenumber ("k"), thereby permitting the derivation of composite complex permeability/conductivity profile.

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Krampfner, Yehuda D. and Johnson, Duane D., "Flexible Substrate Eddy Current Coil Arrays," Review of Progress in Quantitative Nondestructive Evaluation, vol. 7A, pp. 471-478, 1988.
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