双膜结构FBG土压力传感器优化设计及灵敏度分析  

Optimal Design and Sensitivity Analysis of Double-Diaphragm Structure FBG Soil Pressure Sensors

作　　者：邢广志 陈博智 吴文婧 XING Guangzhi;CHEN Bozhi;WU Wenjing(School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212100,Jiangsu,China;China United Engineering Co.Ltd.,Hangzhou 310051,Zhejiang,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212100 [2]中国联合工程有限公司,浙江杭州310051

出　　处：《应用科学学报》2024年第2期248-261,共14页Journal of Applied Sciences

基　　金：江苏省产学研合作项目(No.BY2022063);上海市科委重点实验室项目(No.SKLSFO2021-06)资助。

摘　　要：为实现桩基础结构安全及其服役状态的监测和有效评估,提出一种双膜结构土压力传感器,以光纤布拉格光栅(fiber Bragg grating,FBG)为传感元件,通过保护结构中增加的温度补偿膜,实现温度作用与外部荷载作用的彻底分离。基于双膜结构土压力传感器的工作原理,讨论了传感器压力灵敏度系数特性。结合有限元分析和实验研究,对灵敏度系数的影响参数展开了系统分析。数值分析结果表明,膜片厚度对压力敏感度系数的影响最大,结构半径和膜片厚度可选取为20 mm和1.8 mm;实验结果表明,在0-2 MPa范围内,压力灵敏度系数达3.32 pm/kPa。In order to realize the health monitoring and effective evaluation of the pile foundation structure safety and its service state,a double-diaphragm structure soil pres-sure sensor is proposed in this paper.Fiber Bragg gratings(FBGs)are used as the sensing element.By adding a temperature compensation film in the protective structure,complete separation of temperature effects and external load impacts is achieved.Based on the work-ing principle of a double-diaphragm structure soil pressure sensor,the pressure sensitivity coefficient characteristics of the sensor are discussed.A systematic analysis is conducted on the influencing parameters of sensitivity coefficient by combining finite element analysis and experimental research.Numerical analysis results show that the thickness of the mem-brane has the greatest impact on the pressure sensitivity coefficient.The structural radius and membrane thickness can be set as 20 mm and 1.8 mm,respectively.Experimental results show that within the range of 0-2 MPa,the pressure sensitivity coefficient reaches 3.32pm/kPa.

关 键 词：光纤布拉格光栅 双膜结构 土压力传感器 灵敏度分析 

分 类 号：TN253[电子电信—物理电子学]