无源谐振器在电涡流位移传感器中的谐振增强效应  

Resonant enhancement of a passive resonator in an eddy current displacement sensor

作　　者：刘存跃[1] 董永贵[1] 

机构地区：[1]清华大学精密仪器与机械学系,精密测试技术及仪器国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2012年第11期1607-1610,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(60971007)

摘　　要：在两只同轴电磁耦合线圈之间插入一只无源谐振线圈,可利用谐振耦合显著提高能量传输效率。为探索这种谐振增强效应在传感器领域的应用可能性,制作了一只与测量电路无任何引线连接的、由电感线圈及电容串联组成的无源LC谐振器,放置于电涡流位移传感器探测线圈与金属目标靶间的测量通道中。实验结果表明:当传感器工作在该谐振器的谐振频率点附近时,有效探测距离和灵敏度会得到显著增强。进一步针对发射-接收式双线圈位移检测系统进行了实验,结果同样证实了无源LC谐振器介入后的谐振增强作用。该结论对于其他带有电感耦合线圈的传感系统同样具有参考价值。Insertion of a passive resonant coil between two coaxial electromagnetic coupled coils significantly enhanced the power transmission efficiency by resonant coupling. The ability to apply resonant enhancement in sensor fields was evaluated using a passive LC resonator without any electrical connections with measurement circuits, constructed in a series connecting an inductance coil and a capacitor. This was placed in the detection path between the sensing coil of an eddy current displacement sensor and a metallic target. Test results indicate that when the sensor is working near the resonant frequency of the resonator, the detection distance and sensitivity can be significantly enhanced. Further tests with a transmitter-receiver dual-coil displacement detection system also verify the resonant enhancement caused by insertion of the passive LC resonators. The conclusions are valuable for sensing systems with inductive coupling coils.

关 键 词：传感线圈 谐振耦合 电涡流 位移传感器 电磁感应 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]