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为了适应于变压器的内部振动监测的需要,提出了一种不锈钢毛细管和聚合物(Polymer)相结合的高频光纤布拉格光栅(FBG)加速度传感器。利用有限元分析了不同毛细管厚度和多种聚合物填充下传感器的静态与动态特性,根据仿真参数研制了振动传感器,并通过振动台实验对其灵敏度以及幅频特性作了实验测试。实验结果表明:选择有机玻璃(PMMA)为聚合物填充材料时,毛细管厚分别为0.1、0.2和0.3 mm时,传感器谐振频率分别为1 000、1 050和1 100 Hz,灵敏度分别为32、26和18pm/g;选择环氧树脂为聚合物填充材料时,毛细管厚分别为0.1、0.2和0.3mm时,传感器谐振频率分别为900、1 000和1 050Hz,灵敏度分别为35、29和20pm/g。
In order to meet the need of monitoring the internal vibration of the transformer, a high-frequency fiber Bragg grating (FBG) accelerometer combining stainless steel capillary and polymer was proposed. The static and dynamic characteristics of the sensor with different capillary thickness and polymer filling were analyzed by finite element method. The vibration sensor was developed based on the simulation parameters. The sensitivity and amplitude-frequency characteristics of the sensor were tested by shaking table experiment. The experimental results show that the resonance frequency of the sensor is 1000, 1 050 and 1 100 Hz respectively with capillary thicknesses of 0.1, 0.2 and 0.3 mm, respectively, when the PMMA is selected as the polymer filler. The sensitivities are 32, 26 And 18 pm / g, respectively. When the epoxy resin was used as polymer filler, the sensor resonant frequencies were 900, 1 000 and 1 050 Hz respectively with capillary thicknesses of 0.1, 0.2 and 0.3 mm, respectively, and the sensitivities were 35, 29 and 20 pm g.