Vehicle security system

Details Vehicle security system Vehicle security system

G - Physics

08

B

G08B 21/00 (2006.01) G01V 3/08 (2006.01)

Patent

CA 2067730

2067730 9204645 PCTABS00011 A vehicle security system comprises first and second conductive loops (A and B) for attachment to a vehicle (C) in substantially parallel relationship with a gap (D) between them. Each loop is connected to an associated first amplifier (1, 2) the outputs from which are connected to a differential amplifier (3) which is arranged to sum the output signals received from the first amplifiers. The output from the differential amplifier (3) is connected to a threshold detector (4) which sets a latch (5) to store an alarm condition when a moving magnetic field is detected. The alarm condition signal is interrogated remotely by, for example, an infrared remote control link (8, 11) to activate an alarm (7). As a moving magnet field is passed across the gap between the two loops (A, B) a voltage is induced in each loop and the first amplifiers (1, 2) detect the induced voltage and the differential amplifier (3) determines a phase shift in the two voltages. This phase shift indicates that a moving magnetic field has passed over the gap between the two loops (1, 2), and indicates the possibility of a magnetic bomb device having been attached to the vehicle.

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