Single-mode fiber sensor for distributed temperature and strain based measurements on stimulated Brillouin-scattering

摘要

A fiber sensor is described based on stimulated Brillouin-scattering for distributed temperature or strain measurements using single-mode fibers with lengths exceeding 20 km. A sinusoidal intensity modulated optical signal is used as a probe (frequency domain analysis). Experiments have been carried out at λ=1.32μm and it is demonstrated that a spatial resolution of 1 m has been achieved using fibers of 1 km and 11 km length with resolutions in temperature of 2.6 deg. C and in strain 0.06/100.