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ABSTRACT
In this project, A distributed fibre optic vibration measurement is employed to measure the frequency of pedestrian loading on the pedestrian bridge along Ugbowo-Lagos Express road, just opposite the main gate of the University of Benin. Optical Time Domain Reflectometer (OTDR) is used to obtain the nanoseconds snapshots of the stochastic signal occasioned by vibration. MATLAB software was used to transform the signal from space domain to frequency domain and hence carryout a comprehensive spectral analysis. Data obtained show several frequency peaks at various corresponding backscatter level for high and low pedestrian loading. The measurements were taken and the OTDR readout gives an average attenuation of about .0.4 dB. The natural frequency of the empty bridge is 3.57Hz, but this frequeny changed to 3.10Hz whent occupie with pesdestral loading. High attenuation contributed to low loss and low attenuation led to high loss.
