基于Welch算法的SAW传感器测量系统  

SAW Sensor Measurement System Based on Welch Algorithm

作　　者：甘宇 谭秋林[1,2] 韩磊 王鑫 GAN Yu;TAN Qiulin;HAN Lei;WANG Xin(National Key Laboratory for Electronic Measurement Technology,North University of China,Taiyuan Shanxi 030051,China;MOE Key Laboratory of Instrumentation Science&Dynamic Measurement Technology,North University of China,Taiyuan Shanxi 030051,China)

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《电子器件》2021年第1期91-96,共6页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(U1837209)。

摘　　要：声表面波(SAW)传感器性能卓越,能满足恶劣环境的测量需求。针对测量过程中干扰源淹没回波信号的问题,研究了Welch算法在复杂环境下对提升回波信号检测精度的估计方法,设计了基于SAW温度传感器的温度测量系统,验证了算法在功率谱估计中的性能。测量系统包括发射及接收链路,实现了激励源的发射、回波信号的接收与处理及温度解算等功能。搭建温升实验平台,在20℃~110℃的温度范围通过该系统对高精度数显加热台进行温度测试。测试结果表明,相较于加热台设定温度,实际温度测量误差控制在2.4%以下,系统可靠性高且具有较好的测量效果。The surface acoustic wave(SAW)sensor has excellent performance and can meet the measurement requirements of harsh environments. To solve the problem that the accuracy of the sensor measurement system is poor due to the interference source inundating the echo signal,the estimation method of the Welch algorithm to improve the detection accuracy of the echo signal in a complex environment is studied,and a general temperature measurement system is designed. The performance of the algorithm in power spectrum estimation is verified. The measurement system includes transmitting and receiving links,which realizes the functions of transmitting the excitation source,receiving and processing the echo signal and calculating the temperature. We build a temperature rise experimental platform,and test the temperature of high-precision digital display heating table in the temperature range of 20 ℃ to 110 ℃. The test results show that,compared with the set temperature of the heating table,the actual temperature measurement error is controlled below 2.4%,and the system has high reliability and good measurement effect.

关 键 词：声表面波 Welch算法 测量系统 回波信号 温度解算 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]