Vibration Fiber Sensors Based on SM-NC-SM Fiber Structure


A completely unique vibration sensor based mostly on the single mode (SM)-no core (NC)-SM fiber structure is proposed and experimentally sensing results demonstrated. By numerical simulation, we have a tendency to use an NC fiber (NCF) as the multimode waveguide structure for the multimode interference (MMI) sensing. Through intensity demodulation, the vibration sensing structure can detect continuous vibration disturbances with the frequencies of ranging from a hundred Hz to 29 kHz and also the inherent frequency of cantilever slab of 700 Hz. The frequency sensing resolution is one Hz in real-time monitoring. The proposed compact structure is easy to fabricate and has low price.

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