Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-07-24
1980-06-24
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340522, 340693, 340566, 367 93, 256 1, G08B 1302, G08B 1316
Patent
active
042097762
ABSTRACT:
A fence surveillance and security system includes a plurality of sections of relatively rigid electrical conduit which are supported by a fence. A plurality of housings are provided at spaced intervals between two adjacent sections of the conduit. Within each housing is mounted both a vibration sensor and an ultrasonic intrusion sensor. The vibration sensor produces a vibratory electrical signal in response to vibration transmitted to the housing by the conduit. The ultrasonic intrusion sensor transmits ultrasonic waves and senses changes in the ultrasonic waves resulting from movement of an object in a zone proximate the fence. The system, therefore, provides detection of persons climbing, lifting, or cutting the fence itself, as well as setting up a zone of protection to detect any movement within a predetermined distance of the fence.
REFERENCES:
patent: 3960007 (1976-06-01), Swensen
patent: 3967262 (1976-06-01), Reich et al.
patent: 4005397 (1977-01-01), Blair
patent: 4023155 (1977-05-01), Miller
patent: 4097025 (1978-06-01), Dettmann et al.
patent: 4103293 (1978-07-01), La Forge, Jr.
Electronic Surveillance Fence Security, Inc.
Swann III Glen R.
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