Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1995-06-19
1996-06-18
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324708, G01N 2772, G01R 3312
Patent
active
055281427
ABSTRACT:
A method for quantifying the permeability or conductivity of a conducting material, comprises the steps of providing a circuit including an inductor with a coil and a capacitor connected in parallel to the inductor, the coil having an interior space adapted to enclose the sample material therein; inserting the sample material into the interior space of the coil to completely enclose the sample material therein; resonating the circuit with the capacitor with capacitance C' with the inserted sample material at a resonant frequency f.sub.0 and measuring the resulting impedance, Z' of the circuit; measuring the impedance of the loaded circuit at various frequencies above and below the resonant frequency f.sub.0, and plotting a first bell-shaped curve from the measured impedances against frequencies; resonating the circuit with the capacitor with capacitance C' at a resonant frequency f.sub.x with the sample material removed from the coil and measuring the resulting impedance, Z.sub.0 ; measuring the impedance of the empty circuit at various frequencies above and below the resonant frequency f.sub.x, and plotting a second bell-shaped curve of the measured impedances against frequencies; and determining the conductivity or permeability of the sample material from the first and second bell-shaped curves.
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