Combined type intrusion and attack sensing means

Details Combined type intrusion and attack sensing means Combined type intrusion and attack sensing means

1997-12-11

1999-06-15

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340566, 340574, 342 28, 342 99, G08B 1318

Patent

active

059126205

ABSTRACT:
A combined type intrusion and attack sensing device was a microwave oscillation and Doppler detect circuit an intrusion band-pass filter, an attack band-pass filter, two comparators, two alarm driving circuits, and a suspended object. The combined type intrusion and attack sensing device adopts the Doppler effect to sense an intrusion and employs a microwave antenna to transmit a signal in the microwave band within a predetermined range. The signal will be reflected by any object within above range or suspended object vibration, and the reflected wave will be received by the antenna. The reflected wave will be mixed with original signal to generate a difference-frequency signal. The difference-frequency signal is amplified by an intrusion band-pass filter or an attack band-pass filter. The amplified and filtered signal is sent to two comparator circuits for comparison with a reference signal to generate two driving signals to drive one of the two alarm-generating circuits. The driven alarm-generating circuit will raise an alarm to help prevent burglary.

REFERENCES:
patent: 3760400 (1973-09-01), Galvin et al.
patent: 4129856 (1978-12-01), Humphries
patent: 5684458 (1997-11-01), Calvarese

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