Variable frequency magnetic field device employing multiple ante

Details Variable frequency magnetic field device employing multiple ante Variable frequency magnetic field device employing multiple ante

1990-06-11

1992-02-04

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324230, 324232, 324242, 324243, 324262, G01R 3312, G01N 2772

Patent

active

050862740

ABSTRACT:
A surface impedance measurement device comprises a transmitting antenna producing a magnetic field in the area surrounding a material to be tested and a receiving antenna receiving the magnetic field. An electric voltage wobbled in frequency is applied to the transmitting antenna, and a circuit measures the voltage at the terminals of the second antenna. For the antennae to be applied on the same side of the material to be tested and of which the surface impedance is to be measured, the antennae are superposed by the intermediary of a dielectric wedge in a compact probe. The impedance measurements are then independent of the dimensions and geometry of the material.

REFERENCES:
patent: 2629004 (1953-02-01), Greenough
patent: 3441840 (1969-04-01), Randle
patent: 3764897 (1973-10-01), Greenwood
patent: 3848183 (1974-11-01), Puidak
patent: 3936734 (1976-02-01), Brandli et al.
patent: 4042876 (1977-08-01), Visioli, Jr.
patent: 4706020 (1987-11-01), Viertl et al.

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