International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Distributed fiber optic sensing is known for the few last decades. One of the most interesting area in security field is Distributed Acoustic Sensing (DAS). Nowadays, DAS systems have deployments in many different areas like pipeline monitoring, seismic activity monitoring, or perimeter security monitoring. They can use existing optic fiber networks and create a distributed sensor from this fiber which can monitor areas all acoustic events along the fiber. This paper deals with the evaluation mea surement with a commercial DAS system used for perimeter security. The system was evaluated on university optical fiber test polygon and three different events were classified–man jumping, man walking and car driving along the fiber route. Based on the measurement and another post-processing also the speed of movement can be determined.

The paper focuses on the security of fiber optic infrastructures. The main purpose of the paper is present the vibration detection system for unauthorized access to the fiber optic infrastructure detection. For this purpose, measurement of vibrations using the interferometric method and the measurement based on state of polarization changes evaluation is presented. For the measurement own designed systems were used. Both systems are theoretically described and the principles of use are explained. The measurement was performed at an experimental workplace in a laboratory at the university Based on evaluation measurement both systems are compared in term of sensitivity.