Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1976-10-05
1978-02-21
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
340 38L, G01R 3312
Patent
active
040755533
ABSTRACT:
An electromagnetic detector sensitive to the intrusion of a metallic mass (e.g., a road vehicle) into its field of radiated energy comprises, disposed on a metallic support, a transmitter coil and two strongly coupled receiver coils. These receiver coils are located at a distance from the transmitter coil and on opposite sides of the axis thereof. The axis of the transmitter coil and the common axis of the receiver coils are roughly perpendicular to each other. The presence of a metallic mass in the field around the detector induces signals in the receiver coils varying in relative phase according to the extent of the modification of the generated electromagnetic field. The output voltages of the receiver coils are combined to form a resultant square wave comparison with a reference square wave produces an output signal depending on the phase difference thereof.
REFERENCES:
patent: 661520 (1900-11-01), Haskins
patent: 2160356 (1939-05-01), Fore et al.
patent: 2807777 (1957-09-01), Doll
patent: 3509469 (1970-04-01), Strange
patent: 3996510 (1976-12-01), Guichard
Bouverot Rene
Narbaits-Jaureguy Jean-Raymond
"Thomson-CSF"
Corcoran Robert J.
Ross Karl F.
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