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A practical single-mode birefringent fiber strain sensor is demonstrated. The sensor is based on optical frequency-modulated continuous-wave (FMCW) interference and consists of three lengths of single-mode birefringent fiber. Two fibers are used as the leading fibers, while the third fiber that locates in the middle and has a 45?? rotation of principle axes is used as the strain sensing fiber. The...
A reflectometric singlemode elliptical-core fibre strain sensor is described. The sensor is based on optical frequency-modulated continuous-wave interference and can be used to measure remotely the strain variation of a distant large construction. The advantages of the sensor include high resolution, long dynamic range, long gauge length, and good stability.
A triple-sensor multiplexed fiber-optic displacement sensor is reported, which is based on optical frequency-modulated continuous-wave (FMCW) interference and frequency-division multiplexing. The advantages include high accuracy (0.08 mum) and long dynamic range (1000 mum).
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