Modal Interference Fiber Optic Sensor (MIFOS) for permanent monitoring of the network is presented. A mechanical disturbance of a fiber cable influences on intensity distribution at the end-face of a multimode fiber. Variations in interfering images are analysed by means of a digital processing unit that determines the alarm in case of unauthorized access along the whole length of the fiber. A contrast of an interference pattern and a procedure of fiber optic selection for the sensor are shown. A simple criterion that bases on changes of local maximums positions of the interference patterns is applied. A laboratory arrangement of the sensor and its experimental research are shown.
Modal interference fiber optic sensor
Unmanned/Unattended Sensors and Sensor Networks ; 2004 ; London,United Kingdom
Proc. SPIE ; 5611
2004-11-30
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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