声表面波器件在无线传感系统中的应用

有许多应用场合,无法实现传感器信息的有线传输;在某些特殊场合,迫切需要降低安装传感器的配线总量,降低成本。无线传感系统是传感器的一个研究热点,与基于调制解调的无线传感器相比,基于声表面波的无线传感器在许多特殊场合日益显示出其必要性和重要性。简要介绍了目前国际上的各种无线无源式声表面波传感器的国内外发展现状,具体讨论了无线谐振型声表面波传感器的原理以及在传感器设计、制作过程中提高传感器灵敏度的一些措施,以及声表面波器件用于目标辨识以及常规变阻抗型传感器信息无线传输中的原理和应用。

Application of Surface Acoustic Wave Devices in Wireless Measurement System

In some applications, it is difficult to implement a fixed connection between sensors and signal processing units, or it is necessary to resort to wireless information transmission because of bulky cable. Wireless sensor is one of the focuses in recent sensor research. Compared with modulation based radio sensors, the passive and telemetric surface acoustic wave (SAW) sensors are absolutely necessary in some special environment applications. In this paper, state of the art of SAW sensors is reviewed, and the principle of wireless SAW resonator sensor is presented. In addition, some detailed measures to improve the sensitivity of the sensor in SAW-device design and fabrication are discussed. The application in object identification and wireless information transmission for classical impedance sensor is also presented.