LightFence Perimeter Intrusion Detection
The Azco LightFence Perimeter Intrusion Detection uses a plastic optical fiber (AzcoWire) to detect intrusions on mesh, chainlink and barbwire fences. Fasten the plastic optical fiber (AzcoWire) to a chainlink or mesh fence with special bolts, then run the AzcoWire across the mesh and fasten them with a bend between the poles. There are zero false alarms due to vibrations or winds, and unlike microphone cables, plastic optical fiber (AzcoWire) only detects distortions caused by an intruder. The controller offers four, easy-to-adjust, sensitivity levels and is in an IP66-rated enclosure. A single controller device protects up to 820ft of linear fence, and several controllers can be placed in line for larger projects or to set zones.
http://www.azcotechnologies.com/lightfence-litefence-pof-optical/3/48/