In this paper, an armored-cable-based optical fiber Bragg grating (FBG) sensor array, for perimeter fence intrusion
detection, is demonstrated and some of the field trial results are reported. The field trial was conducted at a critical local
installation in Singapore in December 2010. The sensor array was put through a series of both simulated and live
intrusion scenarios to test the stability and suitability of operation in the local environmental conditions and to determine
its capabilities in detecting and reporting these intrusions accurately to the control station. Such a sensor array can
provide perimeter intrusion detection with fine granularity and preset pin-pointing accuracy. The various types of
intrusions included aided or unaided climbs, tampering and cutting of the fence, etc. The unique sensor packaging
structure provides high sensitivity, crush resistance and protection against rodents. It is also capable of resolving
nuisance events such as rain, birds sitting on the fence or seismic vibrations. These sensors are extremely sensitive with a
response time of a few seconds. They can be customized for a desired spatial resolution and pre-determined sensitivity.
Furthermore, it is easy to cascade a series of such sensors to monitor and detect intrusion events over a long stretch of
fence line. Such sensors can be applied to real-time intrusion detection for perimeter security, pipeline security and
communications link security.