Electromagnetic detector responsive to a modification of a magne

Details Electromagnetic detector responsive to a modification of a magne Electromagnetic detector responsive to a modification of a magne

1977-11-18

1980-11-04

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

324233, G08G 102, G01N 2772, E01F 1100

Patent

active

042322855

ABSTRACT:
An electromagnetic detector designed to monitor road traffic, responsive to a modification of an electromagnetic field produced by the presence of a metallic mass in the vicinity thereof, comprises a metal base on which are disposed a transmitting coil creating a field and a receiving coil whose axis deviates from the perpendicular to the base. The receiving coil detects a measuring field created by the currents induced in the base by the transmitted field. The processed signal is the resultant of the signal produced by the presence of a metallic mass in the transmitted field and by the signal due to the measuring field.

REFERENCES:
patent: 3222637 (1965-12-01), Gray
patent: 3395341 (1968-07-01), Malaquin
patent: 3436649 (1969-04-01), Takechi et al.
patent: 3818430 (1974-06-01), Williams
patent: 3825889 (1974-07-01), Koerner
patent: 3906436 (1975-09-01), Kurauchi et al.
patent: 3911389 (1975-10-01), Mills
patent: 3944912 (1976-03-01), Angel et al.
patent: 4075553 (1978-02-01), Bouverot et al.

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