【摘要】 提出了一种基于花生锥型光纤和长周期光纤光栅的级联式光纤应变/温度双参量传感器.一部分纤芯模式在花生锥形光纤中耦合到包层,并在长周期光纤光栅中部分耦合回纤芯与剩余纤芯模式发生干涉.根据长周期光纤光栅的相位匹配条件,在长周期光纤光栅的光谱包络中出现一系列干涉条纹.实验结果表明该传感器的最高应变和温度灵敏度分别达到-0.564 87 nm/mε和57.29 pm/℃.利用不同干涉峰波长对应变和温度变化的不同灵敏度可以建立双参量传感矩阵.更多还原

【Abstract】 A compact dual-parameter fiber-optic sensor based on concatenation of a fiber peanut taper and long-period fiber grating(LPFG) has been proposed and experimentally demonstrated for simultaneous measurement of strain and temperature. Due to the presence of fiber peanut taper, part of the fundamental core mode could be coupled into fiber cladding modes, part of which would be re-coupled into the fundamental core mode and interfere with the remnant core mode light at the LPFG. Due to the phase matching condition of the LPFG, the interferometric spectral pattern could only be acquired within the transmission resonance spectral envelope determined by the LPFG. Experimental results indicate that the highest strain and temperature sensitivities of the proposed fiber modal interferometer reach-0.564 87 nm/mε and 57.29 pm/℃, respectively. By employing the distinct strain and temperature sensitivities of two interference dips, a sensor matrix could be set up for simultaneous dual-parameter measurement.更多还原