MEASURING VIBRATION CAUSED BY WEIGHT IN MOTION USING FOS

ABSTRACT

Fiber optic sensors offer unprecedented features, the most unique of which is the ability of monitoring variations of the observed physical field with spatial continuity along the fiber. A distributed fiber optic vibrational sensor (FOVS) technique was employed in this study to measure vibration caused by vehicular movement and classify these vehicles in relation to their speed using a 20ns short pulse from a OTDR to record the stochastic signal. The results of the PSD differential show that Camry at increasing speed have broader frequency peak at 20ns when compared to that of 20ns, while the Truck at increasing speed had sharp frequency peak at 50ns when compared to that of 20ns.