基于声表面波器件的无源传感器的研究

利用声表面波器件的高频压电转换特性,研究设计了一种可实现无线访问的时间延迟型无源传感器,为提高回波信号的信噪比,在ＳＡＷ器件的设计中,采用了一种并联式的新型结构以替代传统的共线式结构。利用一套射频访问系统,本文重点针对器件的力敏特性进行了实验研究。实验表明,合理地设计器件中ＩＤ－Ｔａｇ与反射栅的参数,可稳定地测出器件上ＳＡＷ的传播参数,测量结果不受器件与访问系统间距离的影响,利用这一原理,可进上步

Study on Passive Sensor Based on SAW Device

A passive reflective delay line sensor, which can be interrogated by a wireless measurement system, is designed by using high frequency piezoelectricity transform characteristics of the surface acoustic wave device. Instead of conventional layout, a new parallel layout is adopted to gain high Signal-to-Noise ratio in designing the SAW device. In this paper, the experiment for force sensitivity characteristic of this device is carried out through using a set of RF interrogable system. Experiment shows that SAW propagation parameters on the device may be measured precisely by designing parameters of SAW device optimally, and the result of measurement is not affected by distance between the system and the device. By using this principle, many kinds of wireless passive sensors can be manufactured.