作者：刘嘉1, 焦彤1, 周智1,2, 肖海3
作者单位：1. 大连理工大学土木工程学院, 辽宁 大连 116024;
2. 大连理工大学 海岸和近海工程国家重点实验室, 辽宁 大连 116024;
3. 克莱姆森大学电子与计算机工程系, 南卡罗来纳州 克莱姆森市 29630
关键词：同轴电缆;法布里-珀罗传感器;钳压法;优化设计;大应变测量
摘要：
为研究同轴电缆法布里-珀罗干涉（CCFPI）传感器的钳压法制作工艺，模拟不同结构参数对CCFPI传感器信号质量的影响，分析得出CCFPI反射点的绝缘层外径宜在1.4~2 mm范围内，钳压变形长度不应小于2 mm，反射点一致性对信号质量影响显著；模拟电缆拉伸过程，观察到信号频移对电缆应变呈现良好的线性反应。依据模拟结果制作CCFPI传感器，并进行传感性能测试。试验结果表明：CCFPI传感器测得的应变值始终与千分表吻合良好，二者拟合斜率为1.004 92，相关系数为0.998 67，且在小应变范围内CCFPI传感器的测量数据与光纤光栅吻合良好，说明该传感器的测量结果真实可靠；同时观察到CCFPI传感器的分辨率可达110 ，失效应变为140 000 。
Coaxial cable Fabry-Perot sensor fabricated by clamping method
LIU Jia1, JIAO Tong1, ZHOU Zhi1,2, XIAO Hai3
1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;
2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
3. Department of Electrical and Computer Engineering, Clemson University, Clemson 29630, USA
Abstract: To investigate the fabrication of CCFPI(coaxial cable Fabry-Perot interferometer) sensor with clamping method, the effects of different structural parameters on the sensing signal quality of CCFPI sensor is simulated. Simulation results show that the outer diameter of the insulation layer of CCFPI reflection point should be between 1.4 mm and 2 mm, the length of clamping deformation should not be less than 2 mm and the consistency of reflection points has significant influence on the signal quality. In the simulation of the cable tensile process, the frequency shift of the interferogram responds to the cable strain linearly. On this basis, a CCFPI sensor is fabricated and a sensing performance test is carried out. The test results show that the strain measured by CCFPI sensor is consistent with that measured by the dial gauge in the whole tensile process with a fit slope of 1.004 92 and correlation coefficient of 0.998 67. In addition, the value measured by CCFPI sensor is also consistent with that measured by the fiber bragg grating in small strain range, showing that the measured results of the sensor are accurate and reliable. It is also found the CCFPI sensor mentioned in this paper has a resolution of 110 με and failure strain of about 140 000 με.
Keywords: coaxial cable;Fabry-Perot sensor;clamping method;optimal design;large strain measurement
2017, 43(9): 88-93,117 收稿日期: 2017-02-15;收到修改稿日期: 2017-04-08
基金项目: 国家自然科学基金（61675038）
作者简介: 刘嘉(1992-),女,辽宁法库县人,硕士研究生,专业方向为智能传感器与结构健康监测。
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