高强度光纤光栅与碳纤维的复合及应变传感特性研究

Study on Composition of High-strength FBG with Carbon Fiber and Their Strain Sensing Characteristics

摘要:

针对光纤光栅工程化应用性能不佳的问题,提出将高强度光纤光栅与碳纤维材料复合,介绍了复合样品的结构形式,分析了应变传递过程,然后对其应变传感特性和疲劳性能进行了实验研究。结果表明:复合样品能够达到较高的应变传递效率,具有良好的应变传感特性；疲劳实验中复合样品保持正常工作,波长变化曲线的幅度稳定；疲劳实验前后复合样品的应变传感特性基本不变,应变灵敏度系数分别为1.12和1.17pm/με,应变响应曲线的线性度均高于0.999,重复性分别为0.623%和0.397%。

Abstract:

Combination of high-strength FBG and carbon fiber are proposed aiming at the poor performance of fiber Bragg grating (FBG) in engineering applications. The structure of the sample is introduced and the strain transmission process of sample is analyzed. Experiments were conducted to verify the strain sensing characteristic and fatigue property. Experimental results show that the composited samples can achieve high strain transmission efficiency and obtain good strain sensing characteristics. During the fatigue experiment, the samples work properly and the amplitude of wavelength change was stable. The strain sensing characteristics of samples remain essentially unchanged after the fatigue experiment, and the strain sensitivity coefficient is 1.12 and 1.17pm/με, respectively. The linearity is higher than 0.999, and the repeatability are 0.623% and 0.397%, respectively.