Security system utilizing loosely contained optical fiber
US5416467A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 16, 1992 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Apr 16, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/186
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A security system, including a cable having a groove formed in the inside thereof to accommodate therein an optical fiber with an excessive length, a plurality of supports having mandrels to support the optical cable so as to provide a fence, a light transmitter to inject light into one end of the optical cable and a light receiver to detect the light projecting out of the other end of the optical cable so that any transmission loss through the optical cable due to an intrusion of the fence may be measured. The cable is formed so that when tension is applied to the optical cable, a transmission loss is detected. The resulting system has a threshold capability which distinguishes valid from false intrusions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.