时间延迟型声表面波无源传感器的无线访问  

Wireless interrogation of a transit-time SAW passive sensor

作　　者：董永贵[1] 程卫东[1] 王生江[1] 李源[1] 冯冠平[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084

出　　处：《声学学报》2001年第2期109-112,共4页Acta Acustica

摘　　要：介绍了一种基于无源声表面波（ＳＡＷ）器件的无线传感器．作为敏感器件的 ＳＡＷ器件由作为换能器的 ＩＤ－Ｔａｇ和一组反射栅组成．由访问系统发射出的电磁波通过 ＩＤ－Ｔａｇ在 ＳＡＷ器件上激励起声表面波，此声表面波在器件表面传播，被ＳＡＷ器件本身状态参数调制后，反射回波再通过ＩＤ－Ｔａｇ转变成电磁波向空间发射．因此对访问系统接收到的回波信号进行分析即可得到被测量。即实现了无线传感．由于以ＳＡＷ器件为敏感元件可以研制各种各样的物理量、化学量传感器，这种无线访问传感系统可在各种场合得到应用．This paper introduces a wireless sensor based upon a passive surface acoustic wave (SAW) device. As the sensing element, an ID-tag and several reflectors are designed on the SAW device. The interrogate system emit a pulse of radio frequency electromagnetic wave which excites a surfaCe acoustic wave transmitting along the surface of the SAW device. The transit time of the acoustic wave is affected by the parameter of the SAW device. Thus when the reflected acoustic wave excites electromagnetic wave through ID-tag and received by the interrogate system, the parameter to be sensed can be get from analyzing the transit time. Because many kinds of physical/cliemical sensors can be developed based upon the SAW device, this wireless interrogation sensing system can be widely used in many applications.

关 键 词：时间延迟型无源声表面波传感器 无线访问系统 敏感器件 SAW 声表面波 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN65[自动化与计算机技术—控制科学与工程]