Abstract
A high-spatial-resolution distributed optical fiber vibration sensor is demonstrated. The distributed dynamic strain or vibration information can be obtained using time-resolved optical frequency-domain reflectometry (OFDR). Time-domain information is resolved by measuring Rayleigh backscatter spectrum in different wavelength ranges which fall in successive time sequence due to the linear wavelength sweep of the tunable laser source with a constant sweeping rate. This time-resolved local Rayleigh backscatter spectrum shift of the vibrated state with respect to that of the non-vibrated state along the fiber length provides dynamic strain information in a distributed manner. The measurable frequency range of 0-32 Hz with the spatial resolution of 10 cm can be achieved
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