Displacement sensor with a wide dynamic range based on a balloon-like long-period fiber grating
[Objective]Aiming at the problem of the narrow dynamic range of current optical fiber displace-ment sensors,a balloon-like long-period fiber grating(LPFG)displacement sensor with a simple structure and easy preparation method is designed.[Methods]Based on simulation and optimization by RSOFT software,the measurement range is determined by the balloon-like optical fiber under different curvatures.A multimode fiber balloon-like LPFG(MMF-BLPFG)formed by periodically embedding multimode fiber(MMF)into single-mode fiber(SMF)provides a reference peak for measuring the displacement.Using a precise continu-ous cutting device as the experimental basis,test samples consistent with the simulation results are prepared for testing.[Results]The maximum displacement measurement range of 36 mm is achieved by measuring the drift of two resonance peaks.[Conclusions]The proposed sensor has good application potential in large-scale measurement scenarios such as the stability measurement and continuous monitoring of the under-water drainage space piping systems of ships.
optical fiber sensorlong period fiber gratingdisplacement sensorrefractive index modula-tionballoon-like sensor
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维普
