Enlargement of measurement range of simplified BOCDA fiber-optic distributed strain sensing system using a temporal gating scheme

摘要

We propose a method to enlarge the measurement range for Brillouin Optical Correlation Domain Analysis system simplified with time-division pump-probe generation scheme. In this system, the pump and probe lightwaves, which are modulated in frequency with a sinusoidal waveform to localize the stimulated Brillouin scattering periodically, are additionally gated temporally to select only one localized position. We successfully measured distribution of fiber Brillouin gain spectrum over 250m measurement range with 8cm spatial resolution.