Stress measurement at anchor head by using fiber Bragg grating

Q4 Physics and Astronomy 光学技术 Pub Date : 2014-01-01 DOI:10.3788/GXJS20144005.0425

郭丽君 Guo Lijun, 陈富云 Chen Fuyun, 李英娜 Li Yingna, 赵振刚 Zhao Zhengang, 谢涛 Xie Tao, 李川 Li Chuan

引用次数: 0

Abstract

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.

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用光纤光栅测量锚头应力

锚头的受力对锚杆的安全性有重要的影响。为了在线反映锚头受力状态，在对称辐条的中点处沿45°方向粘贴两个光纤布拉格光栅，形成辐轮结构。锚的应力引起辐条的剪切变形，这种变形导致光纤布拉格光栅的波长偏移。通过测量光纤布拉格光栅的中心波长位移，在线监测锚头处的轴向力。压片实验结果表明，光栅1的应变灵敏度为108.8pm/kN，光栅2的应变灵敏度为115pm/kN;光栅1的线性度为0.042% FS，光栅2的线性度为0.023% FS。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

光学技术 Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

0.60

自引率

0.00%

发文量

6699

期刊介绍： The predecessor of Optical Technology was Optical Technology, which was founded in 1975. At that time, the Fifth Ministry of Machine Building entrusted the School of Optoelectronics of Beijing Institute of Technology to publish the journal, and it was officially approved by the State Administration of Press, Publication, Radio, Film and Television for external distribution. From 1975 to 1979, the magazine was named Optical Technology, a quarterly with 4 issues per year; from 1980 to the present, the magazine is named Optical Technology, a bimonthly with 6 issues per year, published on the 20th of odd months. The publication policy is: to serve the national economic construction, implement the development of the national economy, serve production and scientific research, and implement the publication policy of "letting a hundred flowers bloom and a hundred schools of thought contend".