Al_2O_3薄壁管FBG高温高压传感器性能研究

The investigation of FBG sensor of light-walls conduit made of sapphire

用有限单元方法建立了Al2O3薄壁管模型,分析了模型在外部受到均匀压力时的应力应变关系。借助ANSYS软件计算出模型的应力和应变。以上述薄壁管为衬底,设计制作了耐压为0～45MPa、温度为-10～300℃、压力灵敏度系数为0.0426nm/MPa和温度灵敏度系数为0.0112nm/℃的光纤Bragg光栅(FBG)高温、高压传感器,并对其性能进行了测试。结果表明,传感器的压力、应变灵敏度的有限元分析结果与实验测试结果非常吻合。

The eonduit model of sapphire is designed by finite dement analysis. In this way, when the conduit receives external pressure,the relation between the stress and strain was analyzed. A FBG sensor with the test range of 0-45 MPa,-10-300℃ and the sensitivities of 0. 042 6 nm/MPa,0.0112 nm/℃ was designed and fabricated. The testing results show the finite element analysis are completely accord with the experiments.