Description: The 'microstrain' fibre optic sensor is a new and advanced in-ground or fence mounted detection system utilising a multi core fibre. The system can detect minute vibrations even from sounds, via deflections in the laser beam.
By using advanced signal processing and analysis the different causes of vibration can be identified and those attributable to false alarms, eliminated.
Classification: Passive - Covert - Terrain Following
Application: Sited at approx 10cm below the surface of the ground the system provides for relatively quick installation with very high probability of detection and extremely low incidents of false alarms. Where soft ground exists the fibre should be laid in gravel.
Advantages: High detection characteristics, very low false alarm issues if correctly set up, exceptionally long distances between transmitters (65km), pinpoint detection (to less than 50m), spare cores in fibre can carry additional data signals from other equipment and also video signals from CCTV cameras, relatively easy to install.
Possible Causes of Nuisance Alarms: Virtually nil if correctly set up other than land slip or heavy snow.
Methods of Defeat: Very deep tunnelling or bridging, not effective in deep snow.