
针对MEMS水声传感器封装的声振耦合仿真技术研究
石晶晶
1
,黄晓东
1*
, 朱明
2
,刘文
2*
(1. 东南大学 MEMS教育部重点实验室,江苏 南京 210096;
2. 西门子工业软件有限公司,北京 100102)
摘
要:提出了一种针对MEMS矢量水声传感器封装结构的多物理量耦合仿真技术,通过耦合声学有限元仿真技术,以揭示传感
器封装对传感器带宽及灵敏度等关键性能的影响和规律以及传感器在水下工作环境中的声场分布情况。首先建立传感器封装
水下仿真模型,对其进行多物理场耦合仿真,分析封装结构对传感器模态及灵敏度的影响。并研究了传感器封装内部和外部
的声场分布情况,得到声场在空间内的分布规律,得到声源信号透过封装之后的衰减损失约为0.5
dB。最后,比较了封装材料对传感器性能的影响,得出当封装结构和尺寸一定时,传感器的带宽和灵敏度为一对固有矛盾
的结论,为优化传感器封装设计提供理论指导。
关键词:MEMS矢量水声传感器;封装;有限元仿真;声振耦合
Abstract: A multiphysics coupling simulation technology for the package structures of MEMS vector hydrophone is presented by
using an acoustic simulation software. The impact of sensor packaging on the key performance of the sensor and the sound field
distribution underwater were investigated by acoustic coupling Finite Element Method. Firstly, this paper established the encapsulation
model of sensor, and analyzed the influence of the encapsulation structure on the modal and bandwidth. Then the distribution of sound
field in space was studied to calculate the attenuation of the sound source signal after it has passed through the package, about 0.5 dB.
Finally, comparison of the effects of different package structure materials on the sensor performance showed the conclusion that when
the package size is certain, first-order resonance frequency and sound field attenuation is a pair of inherent contradictions, and this
conclusion will provide guidance for optimizing sensor package design.
Key words: MEMS vector hydrophone ; package ; Finite Element Method ; acoustic vibration coupling
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