电磁感应位移传感器耦合天线的设计研究

摘要

New type of electromagnetic induction displacement sensors are widely used in stroke and positioning system because of their advantages of contactless, no wear and good robustness. The electromagnetic coupling characteristics of transmitting and receiving antennas and passive resonator directly affect the measurement accuracy of sensor. The operation principle and basic structure of antenna electromagnetic coupling system are studied, according to the theory of electromagnetic field, electromagnetic field distribution expression of antenna coupling system is derived, and the rationality and correctness of model design is verified through Matlab simulation. Meanwhile, Ansoft Maxwell software is applied to simulate the electromagnetic performance and analyze the crucial parameters, then the reasonable structure parameters of sensing element are given, which provides a theoretical basis for designing aerial system of the sensor.%新型电磁感应位移传感器具有非接触、无磨损、鲁棒性好等优势,广泛适用于各种行程与定位系统.收发天线与无源谐振器的电磁耦合特性直接影响着传感器位置测量精度.对天线电磁耦合系统工作原理和基本结构进行了研究,根据电磁场理论推导天线耦合系统电磁场分布表达式,用Matlab仿真验证模型设计的合理性与正确性.应用Ansoft Maxwell软件进行电磁性能仿真以及关键参数分析,给出合理的传感元件结构参数,为传感器的天线设计提供理论基础.