Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent
1978-11-09
1980-10-21
Trafton, David L.
Communications, electrical: acoustic wave systems and devices
Echo systems
Presence or movement only detection
G08B 1316
Patent
active
042298113
ABSTRACT:
An improved method and apparatus for carrying the method are disclosed which provide for selection by the user of a surface used as a reference in the detection of an intrusion. This is achieved by periodically projecting pulses of acoustical energy from a source towards a reference surface and detecting the reflection of such pulses of acoustical energy at a receiver and providing a first indication or signal representative of the reflected pulses. A second indication or signal is generated which is adjustable and representative of the time elapsed between the projection of a pulse of acoustical energy from the source and the reception at the receiver of the pulse of acoustical energy when reflected from the selected reference surface. The variations between the first and second indications are detected and compared and an alarm is generated when a variation is detected in the indications. In the embodiment disclosed, the absence of variations between the first and second indications is measured by the coincidence of the first and second indications.
REFERENCES:
patent: 3255434 (1966-06-01), Schwarz
patent: 3431549 (1969-03-01), Tullio et al.
patent: 3898640 (1975-08-01), Hossbach
General Electric Company
Nieves Carlos
Platt Leonard J.
Powers George R.
Trafton David L.
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