Advances of Optical Time Domain Brillouin Distributed Fiber Dynamic Strain Sensing Technology
Brillouin distributed fiber sensing technology can realize distributed,long-distance,high precision temperature,or strain sensing and has a wide range of applications in large-scale infrastructure security monitoring.Traditional Brillouin optical time domain analysis and reflectometry(BOTDA/R)must measure Brillouin's gain spectrum by sweeping frequency to obtain Brillouin's frequency shift.The measurement process is time-consuming,and it is difficult to measure the dynamic strain.To solve this problem,researchers have proposed various technical schemes and made significant progress.This paper summarizes the recent progress of the time-domain Brillouin optical distributed fiber dynamic strain sensing system,including the BOTDA/R dynamic sensing system based on the slope-assisted method as well as the frequency-agile,optical chirp chain,and optical frequency comb techniques.
distributed fiber sensingBrillouin scatteringdynamic strainBrillouin optical time domain reflectometry
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