Remotely responsive motion detector

Details Remotely responsive motion detector Remotely responsive motion detector

1977-05-20

1979-03-13

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

331 65, 340561, G08B 1326

Patent

active

041445295

ABSTRACT:
A motion detector comprising a self-excited oscillator operating in the megacycle range which is maintained at a substantially fixed frequency by way of a constant current source. By virtue of the constant current input changes in inductance and capacitance associated with the motion of the intruder are registered as changes in oscillatory amplitude rather than frequency change. This change in amplitude is passed through a low band pass filter, i.e. a filter operating in the range of frequencies normally associated with the motion of a human, and the changes in this filtered signal are then passed through a coupling capacitor to a comparator. In this manner, the DC level, which often drifts in a linear circuit is taken out. The output of the comparator is then applied to a coded transmitter which on the occurrence of an intrusion will set off an alarm at a remotely held receiver.

REFERENCES:
patent: 2992420 (1961-07-01), Riker
patent: 3549905 (1970-12-01), Johnson
patent: 3706982 (1972-12-01), Gehman
patent: 3778807 (1973-12-01), Ralston
patent: 3836828 (1974-09-01), Siegel
patent: 3863240 (1975-01-01), Galvin
patent: 3947734 (1976-03-01), Fyler
patent: 4001613 (1977-01-01), Hills et al.

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