谐振式声表面波温度传感系统查询器设计  

Interrogation Design of SAW Resonator Temperature Sensor System

作　　者：蒋平英[1] 罗山焱[1] 龙峥[1] 施建锋[1] 丁毅[1] 唐小龙[1] 陈婷婷[1] 

机构地区：[1]中国电子科技集团公司第26研究所,重庆400060

出　　处：《压电与声光》2014年第4期498-501,共4页Piezoelectrics & Acoustooptics

基　　金：重庆市科委基金资助项目(cstc2013yykfB40010)

摘　　要：基于声表面波的温度传感器是无源无线的，可用于开关柜等电力设备的在线温度监测。系统中查询器部分由分离元器件组合而成。发射链路采用直接数字频率合成器与本振混频，可快速切换发射频率；接收链路采用二次变频技术，防止发射信号对接收通路影响；精确控制发射接收信号时序，提高测量精度及距离。对传感头在-40--90℃环境下测试数据进行了详细的分析，测温精度可达±1℃。在良好电磁环境下，最大测温距离可达1．5m。Temperature sensor system based on surface acoustic wave resonator （SAWR） is passive and wireless which can be used in substation equipment, such as switchgear. The interrogation unit is assembled with discrete components. The direct digital synthesizer（DDS） mixed with the local oscillator was adopted in RF transmitter chain circuit for satisfying fast frequency changing. The double heterodyne down-conversion was adopted in RF receiver chain for decreasing noise from transmitting. The timing of transmit and receive was exactly controlled for improving the measure precision and distance. Testing data form the sensors at --40~90 ℃ circumstance was analyzed, giving the temperature precision of ±1 ℃. In good electromagnetic circumstance, the maxim measure distance could reach to 1.5 m.

关 键 词：温度传感器 声表面波 谐振式 查询器 射频收发 基带处理 

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]