Patent ID: 7782196

Claim:
A security system for detecting an unauthorized activity and attempt to enter through an entrance of a secured area comprising: an entrance gate for controlling entry through the entrance including a plurality of structural elements form a barrier closing the entrance; a first fiber optic sensor line for sensing a first fault condition representing an unauthorized attempt to open the gate; a second fiber optic senor line for sensing one of an attempted severance and severance of a structural element of the gate; a first fiber optic scanning unit for scanning the first optical sensor line and receiving scan signals estimating attenuations in the first optical sensor line; a second fiber optic scanning unit for scanning the second optical sensor line and receiving scan signals estimating attenuations in the second optical sensor line; at least one system computer for receiving and processing the scan signals in real-time representing the condition of the first and second optical sensor lines and generating a real-time fault signal in response to a predetermined attenuation in one or more of the scan signals indicating the unauthorized activity has occurred; and a communication device communicating notice of the fault signal to security personnel.