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16 May 2007 Fibre optic sensor with disturbance localization in one optical fibre
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Ordinary perimeter security systems consist of many individual sensors with detection range 200-300 meters. These limitations are connected with physical phenomena that are used in microwave and infrared barriers as well as in ground and fence cable sensors. On the contrary, fiber optic perimeter sensors can be applied in the range of many kilometers and zone length 200-300 meters is degradation of their possibilities. This paper presents investigation results of a new generation of the fiber optic perimeter sensor in a two Sagnac and Sagna'c interferometers configuration. This system can detect a potential intruder and determine its position along a protected zone. We propose a method that makes use of the inherent properties of both interferometers. After demodulation of signals from both interferometers, obtained amplitude characteristic of the Sagnac interferometer depends on position of a disturbance along the both interferometer. So, quotient of both demodulated characteristics is proportional to the position of the disturbance. Arrangement of a laboratory model of the sensor and its signal processing scheme is presented. During research of a laboratory model, it was possible to detect the position of the disturbance with resolution of about 50m along a 10-km long sensor.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Zyczkowski and W. Ciurapinski "Fibre optic sensor with disturbance localization in one optical fibre", Proc. SPIE 6585, Optical Sensing Technology and Applications, 65851K (16 May 2007);

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