Combined intrusion sensor line
US4144530A · kind A · utility
21Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Nov 17, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1654
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A single composite cable is deployed between adjacent monitoring stations r sensing an intruder. A number of piezoelectric elements disposed in the cable provide electrical intrusion signals when they are disturbed. Power and triggering pulses for the stations are fed through the cable by a pair of electrical conductors and optical signals representative of the intrusion signals are fed through at least one optical fiber. As a result, the composite cable is relatively lightweight and compact to simplify deployment and it avoids the problems normally associated with crosstalk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.