高接收灵敏度无线声表面波传感器阅读系统研究  

Research on High Sensitivity Wireless Surface Acoustic Wave Sensor Reading System

作　　者：黄鸿辉 曹俊豪 童阿健 何天宜 龚智融 罗为[1] HUANG Honghui;CAO Junhao;TONG Ajian;HE Tianyi;GONG Zhirong;LUO Wei(School of Integrated Circuits,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学集成电路学院,湖北武汉430074

出　　处：《压电与声光》2024年第6期854-859,共6页Piezoelectrics & Acoustooptics

基　　金：国家重点研发计划(2022YFA1204603)。

摘　　要：目前国内外对声表面波(SAW)传感器阅读系统的研究主要集中于传感器的性能指标,对阅读器无线传输系统的研究相对较少。阅读器的性能因受到隔离度、时序控制等因素影响,导致其性能无法完全发挥,这严重制约了系统的远距离读取能力。因此,通过对影响SAW无线传输系统性能的相关因素进行深入研究,同时对SAW特有的指数衰减式回波信号与系统噪声进行分析与处理,进一步提高了回波信号的信噪比,实现了一种具有高接收灵敏度、高集成化的SAW阅读器系统。实验结果表明,该SAW阅读器系统的有线接收灵敏度可达到-110 dBm,且能在2 m距离内实现解调精度为±0.5℃的无线探测,表明其具备远距离、高精度读取能力。At present,research on surface acoustic wave(SAW)sensor reading systems both domestically and internationally mainly focuses on the performance indicators of the sensors,with relatively less research on wireless transmission systems for readers.The performance of readers is often affected by factors such as isolation and timing control,which prevent their full potential and severely limit the system’s ability to read remotely.In response to this issue,this article conducts in-depth research on the factors that affect the performance of SAW wireless transmission systems,and analyzes and processes the exponential attenuation echo signal and system noise unique to SAW,further improving the signal-to-noise ratio of the echo signal and achieving a SAW reader system with high receiving sensitivity and high integration.The experimental results show that the wired receiving sensitivity of the SAW reader system can reach-110 dBm,and it can achieve wireless detection with demodulation accuracy of±0.5℃at a distance of 2 m,indicating its long-distance and high-precision reading capability.

关 键 词：声表面波(SAW) 阅读器 接收灵敏度 软件无线电 无线无源传感 

分 类 号：TN65[电子电信—电路与系统] TN92