Description: Microphonic fence disturbance sensors utilise signals generated by the minute flexing of triboelectric coaxial sensor cable, which are analysed by powerful signal processors to detect the sounds associated with cutting, lifting or climbing the fence fabric.
The systems can also incorporate a special audio channel which enables guards to 'listen in' to activity along each zone of the fence
Classification: Passive - Overt - Terrain Following
Application: For protection of existing fences & structures against climbing, lifting or cutting. The cable is attached by means of special cable ties at 30cm intervals. They can also be fitted to coiled razor wire fences.
Advantages: Quick and simple to install, relatively inexpensive, zone lengths up to 350m, immune to EMI & RFI, high probability of detection, adaptive algorithms virtually eliminate environmental nuisance alarms, audio 'listen in' capability.
Possible Causes of Nuisance Alarms: Extreme weather, contact by large animals, badly maintained fences, overgrown vegetation.
Methods of Defeat: Tunnelling or bridging.