基于光纤Bragg光栅的量测锚头压力研究  

Stress measurement at anchor head by using fiber Bragg grating

作　　者：郭丽君[1,2] 陈富云[1] 李英娜[1] 赵振刚[1] 谢涛[1] 李川[1] 

机构地区：[1]昆明理工大学信息工程与自动化学院,昆明650500 [2]昆明理工大学云南电网公司研究生工作站,昆明650217

出　　处：《光学技术》2014年第5期425-428,共4页Optical Technique

基　　金：云南省应用基础研究计划项目(2013FZ021)

摘　　要：锚头的受力情况对整个锚杆的安全性有着重要影响。为了实时反映锚头的受力状态,将2只光纤Bragg光栅沿45°粘贴在轮辐式结构锚头的两根对称辐条中点处表面上,形成轮辐式测力传感结构,辐条在压力作用下产生剪切变形,引起辐条表面的光纤Bragg光栅中心波长移位。通过对光纤Bragg光栅中心波长移位的测量,实现在锚头处锚杆轴向拉力的在线监测。锚头压力实验表明:光栅1的测力灵敏度为108.8pm/kN,线性度为0.042%FS;光栅2的测力灵敏度为115pm/kN,线性度为0.023%FS。The force of the anchor head has a significant impact on the safety of the anchor rod.In order to reflect the force status of the anchor head on-line,the two optical fiber Bragg grating along 45°are pasted on the surface at the midpoint of the two symmetry spokes,forming the spoke-and-wheel structure.The stress of anchor causes the shear deformation of spokes,and the deformation leads to the wavelength-shift of fiber Bragg grating.By measuring the center wavelength-shift of fiber Bragg grating,axial force at the anchor head on-line is monitored.The press experiment shows that the strain sensitivity of grating 1is 108.8pm/kN,grating 2is 115pm/kN;Linearity of grating 1is 0.042% FS,grating2 is 0.023% FS.

关 键 词：光纤BRAGG光栅 锚头 轮辐 波长移位 实时监测 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]