A new kind of strain measurement Hollow-core Photonic Crystal Fiber (HCPCF) Fabry-Perot (F-P) interferometer sensor is presented. One end of the HCPCF is fused with the single-mode fiber to form the reflecting surface 1. The other end of HCPCF completely collapses to form the reflecting surface 2 by the electrode discharge in the welding machine. So the new F-P interferometer sensor with HCPCF cavity is constituted. The experimental results show that the strain sensitivity of the sensor cavity length of 2 mm at room temperature is 3.1 nm/με, the linearity is 0.999 2 and limit cavity length change is 3 827.3 nm. In the range of 0 ~ 150 ℃, the change of cavity length is about 0.17 μm. Theoretical and experimental results show that the new sensor has a simple fabrication process, high strain sensitivity, low temperature sensitivity and no hysteresis.% 本文提出了一种新型测量应变的空芯光子晶体光纤(HCPCF)法布里-珀罗(F-P)干涉传感器,HCPCF 的一端与单模光纤熔接形成反射面1,另一端在熔接机内通过电极放电使端面完全塌陷形成反射面2,构成以HCPCF为腔体的新型F-P 干涉传感器.实验结果表明,腔长2 mm的传感器在室温下的应变灵敏度为3.1 nm/με,线性度为0.9992,极限腔长改变量为3827.3 nm.温度在0~150℃的温度变化范围内,腔长的改变量约为0.17μm.理论和实验结果表明该新型传感器具有制作工艺简单、应变灵敏度高、温度灵敏度低和没有迟滞现象等优点.
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