Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-11-04
1989-12-12
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
333237, G08B 1318, H01P 300
Patent
active
048870692
ABSTRACT:
An intrusion detection system of the type using cables arranged along a perimeter to be protected and sensing changes in the electrical field around the cables caused by the presence of an intruder. The cables are divided into sections or blocks and typically only one of the sections is energized at any time. The variations caused by an intruder at the selected sections are transmitted through the intervening section to the receiver portion of a transceiver located at one end of the cables. This indicates in which section intrusion has occurred. The system uses continuous wave excitation whereby the expense and complexity of high speed switching and timing of r.f. signals are avoided.
REFERENCES:
patent: 3829767 (1974-08-01), Delogne
patent: 3947834 (1976-03-01), Gershberg et al.
patent: 3975700 (1976-08-01), Halstead
patent: 4091367 (1978-05-01), Harman
patent: 4152648 (1979-05-01), Delogne
patent: 4213123 (1980-07-01), Poirier
patent: 4419659 (1983-12-01), Harman et al.
patent: 4562428 (1985-12-01), Harman et al.
patent: 4630057 (1986-12-01), Martin
Adams Edward L.
Feller Walter J.
Maki Melvin C.
Control Data Canada Limited
Mullen Jr. Thomas J.
Swann III Glen R.
LandOfFree
Perimeter intrusion detection system with block ranging capabili does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Perimeter intrusion detection system with block ranging capabili, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Perimeter intrusion detection system with block ranging capabili will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2124143