光纤FPI次声传感器橡胶金属复合薄膜设计

Structure Design of Rubber Metal Composite Film for Optical Fiber FPI Infrasound Sensor

声压敏感薄膜对光纤FPI次声传感器灵敏度、抗电磁干扰、远距离衰减程度等性能有着重要影响。基于国内外研究现状,针对光纤FPI次声传感系统,设计了一种用于低频次声探测的新型复合薄膜,并利用ANSYS软件对其在均匀受压下的静态响应和在次声频段的动态响应进行了研究。研究表明:复合材薄膜在低频次声波段具有非常高的应变灵敏度(nm/Pa数量级);在同等压强载荷下,对形变量影响最大的是橡胶膜厚度,金属薄膜厚度、金属薄膜材料、金属薄膜直径对薄膜形变量影响较小,橡胶膜厚度大于4μm时线性度较好;复合薄膜在低频次声波段具有高的应变灵敏度和平坦的频响曲线。研究结果可为光纤FPI次声传感器性能优化提供参考。

The sound pressure sensitive film has an important influence on the sensitivity,anti-electromagnetic interference and long-distance attenuation of fiber-optic FPI infrasound sensor.Based on the research status at home and abroad,a new composite film for low-frequency infrasound detection is designed for fiber-optic FPI infrasound sensor system.The static response under uniform compression and the dynamic response in infrasound frequency band are studied by ANSYS software.The results show that the composite film has a very high strain sensitivity in the low frequency infrasound band(nm/PA order of magnitude).Under the same pressure load,the rubber film thickness has the greatest influence on the shape variable,while the metal film thickness,metal film material and metal film diameter have little influence on the shape variable.The linearity is better when the thickness of rubber film is more than 4μm.The composite film has high strain sensitivity and flat frequency response curve in the low frequency infrasound band.The research results can provide reference for the performance optimization of fiber-optic FPI infrasound sensor.