Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent
1984-11-26
1986-04-01
Swann, III, Glen R.
Communications, electrical: acoustic wave systems and devices
Echo systems
Presence or movement only detection
340553, 340554, G08B 1324
Patent
active
045802491
ABSTRACT:
Drift of the standing wave pattern in an acoustic doppler intrusion detection system with radiating and receiving transducers in a confined space is compensated by changing the operating frequency of the carrier wave generator when the magnitude of the received carrier wave is less than a predetermined threshold level. The magnitude of the received carrier wave is continuously monitored and compared to the threshold level. The generator frequency is incrementally increased until the carrier wave magnitude is optimum. This invention comprehends the apparatus for and method of optimizing signal strength at the receiving transducer by this technique.
REFERENCES:
patent: 3407403 (1968-10-01), Charlot, Jr.
patent: 4142187 (1979-02-01), Nakayama
patent: 4198618 (1980-04-01), Kleinschmidt
Magee Mark R.
Miller G. Kirby
Saffran Richard E.
Gilbert Douglas M.
GTE Government Systems Corporation
Lawler John F.
Swann III Glen R.
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