Single mode Fiber optic vibration sensor based on coupled fused tapered coupler owns many good characteristics and has been studied recently. The theory of optic fiber coupling sensor is analyzed. According to the relation that the coupler’s coupling ratio is sensitive to the coupled fused part length change and vibration frequency

strain and vibration parameter detection technology are put forward. The strain and vibration experimental system based on micro strain instrument and cantilever is setup and given in detail. Strain response of fiber coupling sensor is investigated and presented through micro strain test. Temperature and transverse interference are shown. The strain response of fiber coupling sensor is excellent. The dynamic experiments of piezoelectric sensor and coupling fiber-optic vibration sensor are accomplished and the good low and high frequency response is approved. The single mode fiber coupling sensor is feasible to measure vibration signal practically

meanwhile

some influence factors including fused part materials

coupler structure

fabrication need resolve for the engineer application in the future.