High-Spatial-Resolution Time-Domain Simultaneous Strain and Temperature Sensor Using Brillouin Scattering and Birefringence in a Polarization-Maintaining Fiber

摘要

We report on a high-spatial-resolution simultaneous strain and temperature measurement in time domain through measuring Brillouin frequency shift (BFS) and birefringence-induced frequency shift (BireFS) in a polarization-maintaining fiber. High-spatial-resolution BFS and BireFS measurement are obtained through differential pulsewidth pair Brillouin optical time-domain analysis and a local Brillouin grating, respectively. Simultaneous strain and temperature measurement with a spatial resolution of 20 cm is demonstrated in a 6-m Panda fiber. The temperature and strain accuracy is 0.4 $^{circ}$C and 9 $mu varepsilon$, and their range can be up to 700 $^{circ}$ C and 14 m$varepsilon$ , respectively.