一种基于无线供能和无线通信的压力传感器

A Pressure Sensor Based on Wireless Energy Supply and Wireless Communication

摘要: 基于无线供能和无线通信的压力传感器具有便携式的特点，可以摆脱蓄电池或充电的困扰。而且由于是无线的，体积也会比有线的小。根据电磁耦合和谐振的原理设计了一款无线供能和无线通信压力传感器，通过电磁耦合的方式实现能量的传输，通过谐振实现能量传输过程中能量最大化。该标签电路是由一个3匝环形天线、一个二极管、一个电容和一个薄膜压力传感器组成。先通过对天线的HFSS仿真，获取天线的等效参数。然后，通过谐振求得电容的型号，通过二极管的特性选取二极管的型号。最后通过实验得出阅读器天线两端的电压信号和薄膜压力传感器两端的压力信号的关系。基于无线供能和无线通信的传感器可以精确地感知压力的变化，并通过阅读器的天线捕获这种变化，具有低成本、高灵敏度、高机械可逆性、耐久性和稳定性等诸多优点。

Abstract: The pressure sensor based on wireless power supply and wireless communication has the characteristics of portable, which can get rid of the trouble of battery or charging. And the volume will be smaller than the wired because of wireless. According to the principle of electromagnetic coupling and resonance, a wireless energy supply and wireless communication pressure sensor is designed. The energy transmission is realized by electromagnetic coupling, and the energy maximization in the process of energy transmission is realized by resonance. The circuit of the tag is composed of a 3-turn loop antenna, a diode, a capacitor and a thin film pressure sensor. Firstly, the equivalent parameters of the antenna are obtained by HFSS simulation. Then, the type of capacitor is obtained by resonance, and the type of diode is selected by the characteristics of diode. Finally, the relationship between the voltage signal at both ends of the Reader antenna and the pressure signal at both ends of the thin film pressure sensor is obtained through experiments. The sensor based on wireless power supply and wireless communication can accurately sense the change of pressure and capture the change through the antenna of the Reader. It has many advantages, such as low cost, high sensitivity, high mechanical reversibility, durability and stability.