The contactless passive pressure sensor signal detection system realizes the detection of passive sensor signals through electromagnetic coupling,which excludes the disadvantages of wire measurement such as poor safety,low efficiency and so on.According to the mutual inductance model of detection system,it proves that the mutual inductance between the transmitter coil and the receiver coil has an important influence on the signal transmission efficiency.The biggest mutual inductance is essential to achieve the highest efficiency.Factors that affect the mutual inductance of the two parallel coaxial rectangular planar spiral inductor coils have been studied through the theory of the mutual inductance,including shape parameters and coupling distance of two coils.The simulation analysis is done using MATLAB software.The research shows that to get the coupling performance of the two coils better,the two coils should be designed identically,the distance between the two coils should be shorten,at the same time the coils' outside length and number of turns should be increased.%非接触无源压力传感器信号检测系统利用电磁耦合原理实现了无源传感器信号的无线检测,克服了有线测量存在的安全性差、效率低等缺点.通过建立和分析该系统的互感模型,得知发射和接收线圈之间的互感系数是影响信号传输效率的主要因素.为了实现系统的高效信号传输,应尽量提高互感系数.利用互感理论研究了两线圈的形状参数及耦合距离对两平行共轴矩形平面螺旋电感线圈的互感系数的影响,并用MATLAB软件进行了仿真分析.研究结果表明,为了使两线圈的耦合性能最好,两线圈的设计参数应相同,设计时应尽量使两线圈距离接近的同时,增大线圈的外边长和匝数.
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