A fiber-optic strain sensor is fabricated by adopting a novel fiber-optic Fabry-Perot interferometer,which is fabricated by fusing a section of silica capillary tube to a single mode fiber ( SMF ) and collapsing the silica capillary tube at around the fusion point to be taper. Operating principle and sensitivity of the strain sensor are analyzed in theory. Corresponding strain measurement system is constructed. The experimental results show the sensor has a linear response to strain with a sensitivity of 1.34 pm/μεat room temperature(20℃)by adopting the modulation of tracking wavelength peak or valley. The minimum strain resolution is 3. 73 με. The temperature sensitivity is about 5.66 pm/℃. Thus the sensor has potential to be applied in the measurement of strain.%利用一种新型光纤法布里-珀罗干涉仪,制作出一种光纤应变传感器.通过将一段石英毛细管与单模光纤熔接在一起,并将石英毛细管熔接部位熔为锥形制作而成.理论分析了传感器的工作原理与灵敏度,搭建了传感器应变测试系统.实验表明:在常温(20℃)下,采用波峰(谷)追踪法解调,传感器对应变有良好的线性响应,且灵敏度为1.34 pm/με,最小应变分辨率为3.73με,传感器的温度敏感系数约为5.66 pm/℃.因此,该传感器在应变测试中存在一定的潜在应用价值.
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