Phase difference sensitive movement detectors

Details Phase difference sensitive movement detectors Phase difference sensitive movement detectors

G - Physics

08

B

349/30, 343/49

G08B 13/16 (2006.01) G01S 13/56 (2006.01) G08B 13/24 (2006.01)

Patent

CA 1084618

ABSTRACT OF THE DISCLOSURE The reflected signal of a microwave or ultrasonic Doppler intrusion detector is split into two different channels, each containing a mixer for hetrodyning the received signal with a reference signal. The reference signal for one mixer is the transmitted signal, while the reference signal for the other mixer is the transmitted signal with a phase shift. Thus the outputs of the mixers are of the same frequency but different phase. A phase comparator produces two mutually exclusive pulse trains as a function of the outputs of the two mixers, one said output representing motion toward the detector and the other representing motion away from the detector. These pulse trains are applied through a bidirectional counter to upper and lower limit sensors. An alarm circuit is activated if either limit is exceeded, thus providing an alarm in response to sufficient motion in either direction. .

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