基于六端口的声表面波谐振器查询系统研究  

Study on Surface Acoustic Wave Interrogation System Based on a Six-port Resonator

作　　者：何红 赵佐[2] HE Hong;ZHAO Zuo(College of Electronic Engineering,Xi’an Aeronautical University,Xi’an 710077,China;College of Computer,Northwest Polytechnical University,Xi’an 710072,China)

机构地区：[1]西安航空学院电子工程学院,陕西西安710077 [2]西北工业大学计算机学院,陕西西安710072

出　　处：《压电与声光》2020年第5期623-627,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(61103178);西安市科技计划基金资助项目(201805032YD10CG16(2))。

摘　　要：声表面波(SAW)谐振器已广泛应用于各种无线传感器中,为了实现高更新率、高精度的SAW测量,该文提出了一种基于低成本六端口的谐振式SAW查询系统。通过低成本六端口干涉仪,精确快速地测定无源SAW谐振器的频率。利用延迟线,将频率测量值简化为可通过六端口网络进行即时评估的相位测量值,即将引入的相移与非延迟信号进行比较获得频率估计。研究结果表明,与传统设计相比,所提设计不需进行复杂的信号处理,可提供高更新率,且系统成本较低。2.4 GHz频带的实验证明了所提设计的可行性和优越性,实现的精度较高,且测量时间仅需约3μs。SAW resonators are widely used in various wireless sensor applications.In order to achieve high update rate and high precision SAW measurement,a low-cost resonant SAW interrogation system is proposed in this paper.By using a low-cost six-port interferometer,the frequency of a passive SAW resonator can be measured accurately and quickly.By using delay line,the frequency measurement value can be simplified to the phase measurement value which can be evaluated in real time through the six-port network,that is,the frequency estimation can be obtained by comparing the introduced phase shift with the non-delayed signal.The results show that compared with the conventional design,the proposed design can provide a high update rate and lower system cost without complex signal processing.The experiment on 2.4 GHz frequency band has proved the feasibility and superiority of the proposed design,the accuracy is high and the measurement time is only about 3μs.

关 键 词：声表面波 六端口干涉仪 谐振式 延迟线 频率 

分 类 号：TN65[电子电信—电路与系统] TP212[自动化与计算机技术—检测技术与自动化装置]