Hertzian-wave intrusion detetor

Details Hertzian-wave intrusion detetor Hertzian-wave intrusion detetor

1991-11-27

1993-09-28

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, G08B 1318

Patent

active

052489582

ABSTRACT:
The detector indicates the presence of a body (28) which is sufficiently conductive of Hertzian energy in a predetermined volume with the possibility of determining approximately its distance from the receiving aerial from a few millimeters to several meters. A stationary conductive body (28) has no effect on the detection mode. The electronic device consists essentially of an emitter (1) of pulses which are preferably modulated and, if necessary coded, a signal (10) from the emitter (1) after amplification (9) is radiated by the aerial (2). A receiver (13) receives directly the synchronization signal (4) and, if applicable, the coding signal (5) from the emitter (1). If a body (28) which is sufficiently conductive of Hertzian energy passes between or disappears from between the aerials (2, 2a, 26) and (11) the signal received on the aerial (11) varies sufficiently for the receiver (13) to act on a control (12) and signalling (15) mode.

REFERENCES:
patent: 3689888 (1972-09-01), Wootton
patent: 4027276 (1977-05-01), Shaughnessy
patent: 4187501 (1980-02-01), Olesch
patent: 4499564 (1985-02-01), Sirai
patent: 4605922 (1986-08-01), Blattman

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