一种新型的无源无线SAW温度传感器的研究

该文介绍了一种新型的无源无线声表面波温度传感器,传感器的能量来自外界的无线电磁波。通过利用多条耦合器及位于不同声路的两条反射栅,实现了在消除体声波(BAW)干扰的同时,利用两条声表面波(SAW)传输路径差引入相应的声传播延迟,用以提高测温精度。该声表面波温度传感器可采用小波函数包络加权叉指换能器,从而抑制了频率响应曲线中的旁瓣,提高了品质因数。此外,通过使用一个叉指换能器的单端输入、单端输出的结构,可有效减小传感器的体积,使其具有广泛的应用范围。

Study on a Novel Passive Wireless SAW Temperature Sensor

A Novel passive wireless surface acoustic wave (SAW) temperature sensor is presented in this paper. The sensor energy comes from the wireless electromagnetic waves at the outside world. A multi strip coupler and two reflectors located different tracks are used.The former can eliminate the disturbance from bulk acoustic wave (BAW), while the latter can improve the accuracy of the temperature measurement by introducing a delay between the two SAW propagation tracks. In addition, the IDT with wavelet envelope weight is used to suppress the side lobe of the frequency response curve and improve the quality factor. Meanwhile, the transducer structure with the single ended input and single ended output is also used to reduce the size of the sensor effectively and enlarge the applying scope.