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1. (WO2001039148) A METHOD OF PERIMETER BARRIER MONITORING AND SYSTEMS FORMED FOR THAT PURPOSE

Pub. No.:    WO/2001/039148    International Application No.:    PCT/AU2000/001332
Publication Date: Fri Jun 01 01:59:59 CEST 2001 International Filing Date: Tue Oct 31 00:59:59 CET 2000
IPC: G08B 13/12
G08B 13/186
Applicants: FUTURE FIBRE TECHNOLOGIES PTY LTD
TAPANES, Edward, E.
Inventors: TAPANES, Edward, E.
Title: A METHOD OF PERIMETER BARRIER MONITORING AND SYSTEMS FORMED FOR THAT PURPOSE
Abstract:
A perimeter barrier system and method of monitoring a perimeter barrier are disclosed which comprise a perimeter barrier element in the form of a picket (52) or fence panel (50) which is mounted for limited movement by spring loading the barrier element by means of springs (422). An optical fibre (10), (118), is coupled to the barrier elements so that upon an attempt to breach the perimeter barrier system the barrier element is moved to in turn cause movement of the waveguide. A light source (122) and detector (124) is provided for launching light into the fibre (10), (118), and for detecting light which is passed through the fibre so that when the fibre is moved a parameter of the light is changed and that change in parameter is detected by detector (124) to provide an indication of an attempt to breach the perimeter barrier system.