集成应变传感器的无源超高频标签电路设计

Circuit Design of Passive UHF Tag Integrated with Strain Sensor

针对现有有线有源应变传感器不适用于固体火箭发动机壳体应变监测的问题,基于UHF RFID(超高频无线射频识别)技术,设计了一款无源超高频应变传感标签。标签通过电磁反向散射方式,收集超高频射频能量为电路供能,同时在标签电路中加入了大容值储能电容,储存经RFID芯片中的倍压整流电路转换成的直流能量。将标签电路分为UHF标签模块、控制模块和应变传感器模块3个部分进行了设计,并通过使用低功耗芯片以及控制测量电路的断开和闭合来减小功耗。标签将传统的电阻式应变测量技术与UHF RFID技术结合在一起,为实现固体火箭发动机壳体应变的无线监测提供了解决方案。

In order to solve the problem that the existing wired active strain sensor is not suitable for strain mo- nitoring of the solid rocket motor case, a passive UHF RFID tag integrated with strain sensor is designed based on UHF RFID technology. The tag collects UHF RF energy through the electromagnetic backscatter mode as the circuit power. Moreover, a large energy storage capacitor is added to the tag circuit to store the DC energy converted by the voltage multiplying rectifying circuit in the RFID chip. The tag circuit is divided into three parts namely UHF tag module, control module and strain sensor module. The tag power consumption is reduced by using the low-power chips and controlling the opening and closing of the measuring circuit. The tag com- bines traditional resistive strain measurement technology with UHF RFID technology, and provides a solution for wireless monitoring of the solid rocket motor case strain.