Humidity influence on embedded fiber Bragg grating strain sensors
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摘要: 植入复合材料的光纤光栅应变传感器通常涂覆了工作温度高、抗拉强度大的聚酰亚胺。然而，聚酰亚胺涂覆层的体积受湿度影响。采用理论分析、有限元仿真和实验的方法，研究了湿度对植入碳纤维复合材料的光纤光栅应变传感器的影响。优化网格划分以提高仿真精度，湿度变化导致的光纤光栅应变传感器应变变化的仿真值小于4 。湿度实验进行了10天连续测量，经过温度补偿后，植入复合材料的光纤光栅应变传感器测量值变化小于8 。分析和实验结果表明，湿度变化对聚酰亚胺涂覆的植入式光纤光栅应变传感器没有显著影响。通过拉伸试验对植入式光纤光栅应变传感器的重复性、线性度等指标进行了测试和分析，结果表明传感器具有良好的重复性和线性度。Abstract: Fiber Bragg grating strain sensors embedded in composite material are generally coated with polyimide which can operate at high temperature environment with large tensile stress. However, the volume of polyimide coating is influenced by humidity. The humidity influence on fiber Bragg grating strain sensors which were embedded in carbon fiber reinforced composite material was investigated by theoretical analysis, finite element simulation and experimental method. The partition of mesh was optimized to improve the precision of the simulation, and the simulated strain variation of fiber Bragg grating strain sensor caused by relative humidity change was less than 4 . The humidity experiment results were obtained from 10 days continuous tests, and the measured strain variation of fiber Bragg grating strain sensor in carbon composite material was less than 8 with temperature compensation. The simulation and experiment results reveal that the embedded fiber Bragg grating strain sensors coated with polyimide are not significantly influenced by humidity change. The characterizations of embedded fiber Bragg grating strain sensor, including repeatability and linearity were tested and analyzed in tension test. The embedded fiber Bragg grating strain sensors possess good repeatability and linearity.
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Key words:
- fiber Bragg grating /
- strain sensor /
- humidity /
- composite material /
- embedded
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