Brillouin Distributed Optical Fiber Sensing Based on Disordered Signals
摘要
Among distributed fiber optic sensors based on Brillouin scattering, Brillouin optical coherence domain systems are favored by domestic and international researchers because they provide high spatial resolution and relatively long measurement range. The spatial resolution and measurement range of conventional periodic sinusoidally modulated Brillouin optical coherence domain systems can be adjusted by varying the modulation amplitude and modulation frequency of the laser source to achieve random access sensing measurements by detecting the correlation peaks at specific locations in the fiber. However, since multiple periodic correlation peaks are generated, the precise measurement range of the system is limited to two adjacent correlation peaks.