Abstract: 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.
摘要：本文研究了一种用于超大型应变监测的宽范围光纤光栅传感器的脱敏方法，这是大型基础设施或某些特殊场合的必要要求。在适当的假设条件下，利用剪切滞后理论对大范围光纤光栅传感器的应变传递分布进行了研究，以提高超大型应变测量的精度。讨论了粘层弹性模量对应变传递速率的影响。通过两层钢管封装，设计制作了两个不同监测范围的原型。实验结果验证了该理论模型的正确性。此外，实验表明，在大范围FBG传感器的校准方面，放大系数分别提高了2.08倍和3.88倍。本实验对静态误差进行了计算和分析。宽范围FBG应变传感器具有良好的线性和稳定性，是超大型应变监测传感器的优良能。
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Sensors 2019, 19(8), 1851
by Li Sun, Chuang Li, Chunwei Zhang, Tianqi Liang and Zihao Zhao
©本文版权 | This article belongs to the Special Issue Optical Fiber Sensors 2018–2019
