Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1987-11-13
1990-01-30
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324 95, 324117R, 336 84C, G01R 122, H01F 1504
Patent
active
048976008
ABSTRACT:
A current detector for detecting the high frequency current flowing in a conductor includes a coil of high resistivity material wound around an non-ferromagnetic core. The coil is arranged in a substantially closed loop configuration around the conductor carrying the current to be measured. The ratio of the winding spacing to the cross sectional area of the coil is maintained constant over the length of the winding. A shield of high resistivity material surrounds the coil and is spaced from the coils and the shield has a gap oriented along an azimuth of the closed loop winding and directed orthogonal to the net current direction of the current induced in the coil. The ends of the coil are coupled to a high impedance voltage detector through high resistivity leads and a relatively low value resistor is coupled between the leads to reduce the quality factor. The current detector may be used to detect current flowing in a human body due to the absorption of high frequency incident radiation as an indication of the specific absorption rate of such radiation.
REFERENCES:
patent: 3434052 (1969-03-01), Fechant
patent: 3721900 (1973-03-01), Andrews
patent: 3794914 (1974-02-01), Aslan
patent: 3885213 (1975-05-01), Rioux et al.
patent: 3931573 (1976-01-01), Hopfer
patent: 4207518 (1980-06-01), Hopfer
Babij Tadeusz M.
Hagmann Mark J.
Barron Harry W.
Florida International University
Karlsen Ernest F.
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