Measurement of Vibration of Honda Crv using Distributed Fibre Optic Sensor

Abstract

Optical fibres are made of silicon glass or plastic for transmitting light signal over long and short distances. Technological advancement in photonics has led to its use in fibre optic sensor (FOS), which has gained popularity in present day sensing technology due to its immunity to electromagnetic interference, resistance to environmental toughness, remote sensing capabilities amongst others. Fibre optic vibration sensor converts vibration signal to light signal. A distributed fibre optic vibration measurement is employed to measure the frequency of vibration caused by controlled vehicular movement between Capitol and Energy Centre, in the University of Benin. Optical Time Domain Reflectometer (OTDR) is used to obtain the millisecond snapshots of the signal arising therefrom. An expression for forced vibration on the multi-mode fibre caused by external perturbation was derived to obtain the phase shift and change in propagation of the signal. MATLAB 7.3 software was used to transform the signal from space domain to frequency domain and hence carry out the spectral analysis. Data obtained from the Fiberizer cloud showed high attenuation contributed to low loss and low attenuation led to high loss. Vehicles movement were classified according to their speed. Comprehensive spectral analysis was carried out for Honda CRV at low and high speed. Frequency distribution at low speed gave 0.283Hz, 0.291Hz, 0.201Hz and 0.445Hz for Honda CRV.