基于光纤光栅的抗偏载压力环传感研究及其工程应用  

Research and Engineering Application of Anti-Bias Load Pressure Ring Sensing Based on Fiber Bragg Grating

作　　者：朱觉文 王长海 梁才 侯泽群 林婧 沈全喜 ZHU Juewen;WANG Changhai;LIANG Cai;HOU Zequn;LIN Jing;SHEN Quanxi(Guangxi Xinfazhan Communication Group Co.,Ltd.,Nanning Guangxi 530029,China;Guangxi Communications Design Group Co.,Ltd.,Nanning Guangxi 530029,China;College of Earth Sciences,Guilin University of Technology,Guilin Guangxi 541004,China)

机构地区：[1]广西新发展交通集团有限公司,广西南宁530029 [2]广西交通设计集团有限公司,广西南宁530029 [3]桂林理工大学地球科学学院,广西桂林541004

出　　处：《传感技术学报》2024年第10期1700-1708,共9页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(52068014)。

摘　　要：为解决压力传感器在拉索索力监测中抗偏载能力不足的问题,设计了一种基于光纤光栅的组合式压力环,理论分析了粘贴式光纤光栅传感器与基体之间的应变传递率;根据索力监测量程,对承力支柱的弹性模量、直径、数量及光纤光栅自感知杆件预拉应力提出了设计要求。利用8个准分布式光纤光栅传感器预拉应变的恢复对索力进行监测,消除偏载对测量结果的影响。采用压力试验机对组合式光纤光栅压力环进行循环加载试验,结果表明,组合式光纤光栅压力环能有效监测荷载,其监测灵敏度约为2.2982×10^(-4)nm/kN,线性度误差≤0.821%、迟滞误差≤0.382%、重复性误差≤3.758%、总精度≤3.867%。利用组合式光纤光栅压力环对桥梁的索力张拉进行实时监测,并与油压表读数法、频率法相互验证,分析发现,组合式光纤光栅压力环和频率法监测的索力基本相近,误差在3.4%以内。组合式光纤光栅压力环利用分区承载、预拉应变的恢复实现受压监测,消除偏载弯曲产生的测量误差,提高监测精度高,改变自感知杆件预拉应力和承力支柱数量可实现多种规格拉索的索力监测,降低工程监测成本。In order to solve the problem of insufficient anti-eccentric load capacity of the pressure sensor in cable force monitoring,a combined pressure ring based on fiber Bragg grating is designed,and the strain transfer rate between the bonded fiber Bragg grating sen sor and the substrate is theoretically analyzed.According to the cable force monitoring range,the design requirements are put forward for the elastic modulus,diameter,and quantity of bearing pillars of the combined fiber Bragg grating pressure ring and the pretension stress of fiber Bragg grating self-sensing rod.The cable force is monitored by recovering the pretension strain of eight quasi-distributed fiber Bragg grating sensors to eliminate the influence of eccentric load on the measurement results.The cyclic loading test of the combined fiber Bragg grating pressure ring is carried out by using the pressure testing machine.The results show that the combined fiber Bragg grating pressure ring can effectively monitor the load,its monitoring sensitivity is about 2.2982×10^(-4)nm/kN,linearity error≤0.821%,hysteresis error≤0.382%,repeatability error≤3.758%,and total accuracy≤3.867%.The combined fiber Bragg grating pressure ring is used to monitor the cable tension of a bridge in real time,and it is mutually verified with the reading method of the oil pressure gauge and frequency method.Through analysis,it is found that the cable tension monitored by the fiber Bragg grating pressure ring and frequency method is similar,and the error is within 3.4%.The combined fiber Bragg grating pressure ring uses the subarea bearing and the recovery of pretension strain to realize compression monitoring,eliminate the measurement error caused by eccentric load bending,improve the monitoring accuracy,change the self-sensing rod pre-tension stress and the number of load-bearing pillars to achieve cable force monitoring of multiple specifi cations of cables,and reduce the project monitoring cost.

关 键 词：索力监测 光纤光栅传感器 组合式压力环 抗偏载 应变传递率 

分 类 号：TN253[电子电信—物理电子学]