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针对光纤光栅(FBG)的静水压力增敏及压力温度交叉敏感问题,提出光纤光栅的椭圆型边孔封装结构。采用有限元方法分析了封装结构中光纤光栅的力学效应,在此基础上得到优化的椭圆封装结构,并通过实验检验了理论分析结果。研究结果表明:优化的椭圆边孔封装结构中光纤光栅的静水压力灵敏度比裸光纤光栅高了4 198倍,而温度灵敏度仅增加了3.4倍,与裸光纤光栅相比,压力温度交叉敏感降低了1 760倍。该研究结果对光纤光栅压力传感器的实用化研究有参考价值。
Aiming at the problem of hydrostatic pressure sensitization and pressure-temperature cross-sensitivity of FBG, an elliptical edge package structure of fiber grating is proposed. The mechanical effect of the fiber grating in the package structure was analyzed by using the finite element method. On the basis of this, the optimized elliptical package structure was obtained and the theoretical analysis results were verified through experiments. The results show that the hydrostatic pressure sensitivity of fiber gratings is 4 198 times higher than that of bare fiber gratings and the temperature sensitivity is only increased 3.4 times. Compared with bare fiber gratings, the cross-sensitivity of pressure gratings is reduced 1 760 times. The research results have reference value for the practical research of FBG pressure sensor.