Field disturbance detection system

Details Field disturbance detection system Field disturbance detection system

1984-05-30

1987-08-11

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

342 42, G08B 1314

Patent

active

046865179

ABSTRACT:
An electromagnetic detection system is described which, in operation, in a detection zone, by means of at least one transmission antenna coil, generates a swept-frequency interrogation field capable of being at least partly absorbed by a responder comprising a tuned circuit, if such responder is present in the detection zone. Detection means are provided, coupled with the transmission antenna coil to detect such absorption. According to the invention the detection means comprises means for eliminating spurious frequencies located outside the band of the swept frequency, said means comprising a mixer including a first input to which a signal from the transmission antenna coil is supplied, and a second input to which the output signal from a sweeper feeding the transmission antenna coil is supplied, and including an output connected with a low-pass filter.

REFERENCES:
patent: 3798642 (1974-03-01), Augenblick et al.
patent: 3810147 (1974-05-01), Lichtblau
patent: 3868669 (1975-02-01), Minasy
patent: 3984835 (1976-10-01), Kaplan et al.
patent: 4023167 (1977-05-01), Wahlstrom
patent: 4117466 (1978-09-01), Lichtblau
patent: 4356477 (1982-10-01), Vandebult
patent: 4499564 (1985-02-01), Sirai

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