This paper describes a novel birefringent fiber remote strain sensor which is based on the FMCW technique and consists of a single length of single-mode birefringent fiber. The lead-in/lead-out fiber and the strain sensing fiber probe are separated by introducing a twist in the middle of the fiber. The sensor demonstrated is shown to have several advantages including a resolution of 2 microstrain resolution, a dynamic measurement range of 5000 microstrain, an environment-insensitive lead-in/lead-out signal section and a variable length strain sensing probe. The system is ideally suited to the measurement of absolute and relative strain.
展开▼
