光子学报 ›› 2020, Vol. 49 ›› Issue (10): 1006001-1006001.doi: 10.3788/gzxb20204910.1006001

• 光纤光学与光通信 • 上一篇    下一篇

正向压力下FBG柔性传感器界面滑移的应变误差分析

葛子阳1(), 王彦1(), 秦楠1, 梁大开2, 胡兴柳3   

  1. 1.安徽工业大学 电气与信息工程学院,安徽 马鞍山 243000
    2.南京航空航天大学 机械结构力学及控制国家重点实验室,南京 210016
    3.金陵科技学院 智能科学与控制工程学院,南京 211169
  • 收稿日期:2020-05-27 接受日期:2020-08-07 出版日期:2020-10-25 发布日期:2020-10-13
  • 通讯作者: 王彦 E-mail:1542122377@qq.com;wangyan@ahut.edu.cn
  • 作者简介:葛子阳(1996-),男,硕士研究生,主要研究方向为光纤传感技术. Email: 1542122377@qq.com|王彦(1975-),女,教授,博士,主要研究方向为光纤传感技术. Email: wangyan@ahut.edu.cn
  • 基金资助:
    国家重点研发计划(2017YFC0805103);安徽省教育厅自然科学基金重点项目(KJ2017A041);江苏省自然科学基金(BK20171114)

Analysis of Strain Error of FBG Flexible Sensor with Relative Slip under Vertical Pressure

Zi-yang GE1(), Yan WANG1(), Nan QIN1, Da-kai LIANG2, Xing-liu HU3   

  1. 1.School of Electrical and Information Engineering,Anhui University of Technology,Maanshan,Liaoning 243000,China
    2.State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
    3.College of Intelligent Science and Control Engineering,Jinling Institute of Technology,Nanjing 211169,China
  • Received:2020-05-27 Accepted:2020-08-07 Online:2020-10-25 Published:2020-10-13
  • Contact: Yan WANG E-mail:1542122377@qq.com;wangyan@ahut.edu.cn
  • Supported by:
    National Key Research and Development Program of China(2017 YFC0805103);Key Project of Natural Science Foundation of Anhui Provincial Department of Education(KJ2017A041);Jiangsu Natural Science Foundation(BK20171114)

摘要:

为了研究光纤布拉格光栅柔性传感器与封装材料界面间的相对滑移引致的应变误差是否可以忽略,采用ANSYS有限件元仿真软,分析了滑移引起的纤芯各点轴向应变的相对误差与正向压力关系,通过分析影响传感器结构的敏感性参数包括纤芯材料、涂覆层材料、封装材料与尺寸,探讨相对滑移对光纤布拉格光栅轴向应变相对误差的影响.研究结果表明,正向压力在[0.1 N,10 N]范围时,纤芯各点轴向应变相对误差随着正向压力的增大而减小,且呈现纤芯小两端大的趋势.实际应用中应结合正向压力大小,选取弹性模量较小的纤芯材料和摩擦系数较大的封装材料,可使轴向应变相对误差小于10%;选择涂覆层弹性模量为2.4×1010 Pa,厚度为0.062 5 mm,可使轴向应变相对误差降低到8.57%;当光纤布拉格光栅半埋入长度大于40 mm时,纤芯的轴向应变相对误差总体低于20%,此时可认为涂覆层与硅胶之间为完全粘结,无相对滑移.

关键词: 光纤布拉格光栅, 应变传递, ANSYS有限元, 相对滑移, 相对误差

Abstract:

To discuss the strain error caused by the relative slip between the flexible Fiber Bragg Grating sensor and the substrate material, ANSYS finite element simulation software was used to analyze the relationship between the relative error of axial strain at each point of the core and the forward pressure. The parameters affecting strain transfer of the sensor, including core material, coating material, substrate material and size were analyzed, and the effect of relative slip on the relative error of FBG axial strain were explored. The results show that the relative error of axial strain at each point decreases with the increase of forward pressure, when the pressure is in the range of [0.1 N, 10 N], which presents the trend of small in core and big in two ends. In practical application, it should be combine the positive pressure to select the core material with less elastic modulus and the substrate material with higher friction coefficient, the relative error of axial strain could be less than 10%; select coating elastic modulus 2.4×1010 Pa, 0.062 5 mm thickness, the relative error of axial strain could be reduced to 8.57%; when half length of the FGB is more than 40 mm, the axial strain relative error of the core could be less than 20%, at this point, it could be considered that the coating and silica gel are completely bonded.

Key words: Fiber Bragg grating, Strain transmission, ANSYS finite element simulation, Relative slip, Relative error

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