声表面波射频识别与温度传感一体化系统  

The Integrated System With SAW Radio-frequency Identification and Temperature Sensing

作　　者：赵文玉 陈智军[1] 朱卫俊[2] 程胜军[2] 陈涛[1] 贾浩 ZHAO Wenyu;CHEN Zhijun;ZHU Weijun;CHENG Shengjun;CHEN Tao;JIA Hao(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;CETC Deqing Huaying Electronics Co., Deqing 313200, China)

机构地区：[1]南京航空航天大学自动化学院,江苏南京211106 [2]中电科技德清华莹电子有限公司,浙江德清313200

出　　处：《压电与声光》2019年第3期326-329,334,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51475240);南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj20180301)

摘　　要：在物联网的多应用场合中需要同时实现识别和传感功能,这是声表面波技术的优势之一。采用脉冲时延结合相位编码方案设计了编码容量近三百万的声表面波标签,分析了标签的一体化识别与测温原理。采用射频直接欠采样数字正交解调方案设计了相应的阅读器,以提高识别和测温的准确性与稳定性。在柔性电路板上设计制作了小型化折叠偶极子天线,从而拓展了应用领域。实际测试结果表明,搭建的系统在-20~60℃能正常工作,在距离2m内不仅能实现准确识别,而且测温精度可达0.6℃。In the multi-application of the Internet of Things (IoT), it is necessary to realize the identification and sensing functions simultaneously, which is one of the advantages of surface acoustic wave (SAW) technology. A SAW tag with encoding capacity of nearly 3 million is designed by using the scheme of combining the pulse time delay and phase encoding, and the principle of integrated identification and temperature measurement is analyzed. In order to improve the accuracy and stability of identification and temperature measurement, a digital orthogonal demodulation scheme based on radio frequency direct under-sampling is used to design the corresponding reader.A miniaturized folded dipole antenna is designed and fabricated on the flexible circuit board, which expands the application field. The actual test results show that the built-up system can work normally in the temperature range of -20~ 60 ℃, and can not only realize accurate identification within 2 m, but also reach the temperature measurement precision of 0.6 ℃.

关 键 词：射频识别 温度传感 食品安全 声表面波标签 数字正交解调 标签天线 

分 类 号：TN65[电子电信—电路与系统] TP212.9[自动化与计算机技术—检测技术与自动化装置]