Sun Li, Li Chuang, Zhang Chunwei, Liang Tianqi, Zhao Zihao
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China.
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China.
Sensors (Basel). 2019 Apr 18;19(8):1851. doi: 10.3390/s19081851.
This research focuses on a desensitization method to develop a wide-range FBG sensor for extra-large strain monitoring, which is an essential requirement in large scale infrastructures or for some special occasions. Under appropriate hypotheses, the strain transfer distribution of wide-range FBG sensor based on the shear-lag theory is conducted to improve the accuracy of extra-large strain measurements. It is also discussed how the elastic modulus of adhesive layer affects the strain transfer rate. Two prototypes in different monitoring ranges are designed and fabricated by two layers of steel pipe encapsulation. The presented theoretical model is verified by experimental results. Moreover, it is demonstrated that experimentation in regards to the calibration of the wide-range FBG sensor, improved the amplification coefficient up to 2.08 times and 3.88 times, respectively. The static errors are both calculated and analyzed in this experiment. The wide-range FBG strain sensor shows favourable linearity and stability, which is an excellent property of sensors for extra-large strain monitoring.
本研究聚焦于一种脱敏方法，以开发用于超大应变监测的宽量程光纤布拉格光栅（FBG）传感器，这是大规模基础设施或某些特殊场合的一项基本要求。在适当假设下，基于剪切滞后理论对宽量程FBG传感器的应变传递分布进行研究，以提高超大应变测量的准确性。还讨论了粘结层的弹性模量如何影响应变传递率。通过两层钢管封装设计并制作了两个不同监测范围的原型。实验结果验证了所提出的理论模型。此外，结果表明，针对宽量程FBG传感器校准的实验，放大系数分别提高到了2.08倍和3.88倍。本实验对静态误差进行了计算和分析。宽量程FBG应变传感器显示出良好的线性度和稳定性，这是用于超大应变监测的传感器的优良特性。
