摘要
频率特性与生物膜的位置和大小的关系是设计多功能生物传感器的关键.设计了微悬臂梁MC(Micro Cantilever)、压电元件和生物膜组成的多功能传感器,用有限元方法分析了微悬臂梁的弯曲振动模型的固有频率与节点位置的关系,确定了如何选择固定两种生物膜的位置和大小的方法,实验和模拟结果表明正交节点位置的质量变化使频率具有正交响应.验证了利用有限元的频率振动模型分析设计多功能压电换能器的有效性.进而分析了设计可测量纳米质量的生物膜多功能MC的可能性.
The relation between the frequency characteristic and biomembrane position and size is very important in designing the multifunctional biosensor. A multifunctional transducer is designed which consisted of an aluminum micro-cantilever,a piezoceramic patch and bio membrane. Based on the finite element method, the characteristics of bending vibration of MC and nodes position are analyzed, the method how to decide the two optimal positions for coating the membranes and its size are proposed. The results of experiment and simulation shown that the mass changed on the nodes for coating the membrane with orthogonal characteristic does not interfere the frequencies shift of each other. The concept for designing multifunctional transducer is proposed based on the mode function and its validation is proved experimentally. Furthermore, the simulation shown the possibility for designing a multifunctioanl MC for measuring nanogram bio membrane.
出处
《传感技术学报》
CAS
CSCD
北大核心
2007年第7期1488-1493,共6页
Chinese Journal of Sensors and Actuators
基金
广东省自然科学基金资助项目(032030)
关键词
生物传感器
微悬臂梁换能器
压电阻抗
有限元法
biosensor
micro cantilever transducer
piezoelectric impedance
finite element method EEACC
