Year
2003
Abstract
Many different detection technologies have been employed for perimeter detection to sensitize a barrier, including for example, strain-sensing taut wire sensors, electric fences, electrostatic sensors, and various linear “microphonic” cable-sensing devices. These outdoor perimeter fence detection sensors must reliably detect intruders attempting to cut or climb the barrier, while ignoring the effects of environmental noise, including nearby activity. At the 2001 INMM Annual Meeting, the new IntelliFIBERTM fiber optic based product was introduced and compared with previous technologies. IntelliFIBER is designed to provide the advantages of a non-conductive “dielectric” cable sensor, – e.g., resistance to electromagnetic interference and the ability to provide longer cable zones. It utilizes the proven processor of the Intelli-FLEXTM triboelectric cable fence sensor which provides relay or bi-directional networked serial communications, and is compatible with its calibration module. IntelliFIBER also capitalizes on the Intelli-FLEX’s adaptive detection algorithms, that were developed through extensive field testing, to provide exceptional immunity to environmental alarms, while still detecting the skilled intruder. Outlined in this paper are the advancements in the IntelliFIBER development since introduction, as well as the field test results obtained from sensor testing each of a number of new options. Some of the new IntelliFIBER advancements are in the sensing cable used as a linear microphone to detect intruders. These include, for example, a hybrid cable version with both embedded power conductors and additional fibers. This feature provides a highly robust cable, one that does not require a conduit for all-weather detection, while providing an economic advantage for multiple zone perimeter applications. With this option, both the power system and data communications are secured, and the expense of adding separate perimeter power and data networks is removed. This advancement provides for further applications beyond the typical perimeter one, such as securing data or power networks from intrusion. Field test results, from our own outdoor field test S.I.T.E. are presented for the different cable options, and also compare IntelliFIBER with its triboelectric-based counterpart, Intelli-FLEX. The long-term monitoring data includes the actual performance, in terms of probability of detection, false and nuisance alarm rates. Vulnerability to defeat is also discussed.