基于SOPC的高精度超声波温度计设计  

Design of high precision ultrasonic wave thermometer based on SOPC

作　　者：张天恒[1] 张兴红[1] 陈锡侯[1] 郑方燕[1] 

机构地区：[1]重庆理工大学机械检测技术与装备教育部工程研究中心,时栅传感及先进检测技术重庆市重点实验室,重庆400054

出　　处：《传感器与微系统》2014年第2期101-104,共4页Transducer and Microsystem Technologies

基　　金：重庆市自然科学基金资助项目(CSTC2012JJA70004)

摘　　要：根据在介质中超声波的传播速度随温度变化而变化的特点为设计原理,以基于Nios II处理器软核的可编程系统级芯片(SOPC)为控制核心,设计了高精度超声波温度计。在SOPC上同时实现了高频信号发生器模块、高速信号电路控制模块、信号自动采集控制模块以及Nios II软核处理器模块,缩小了体积,并降低了成本。传播时间的精确测量采用软件细分插补算法,经过理论分析和实验验证,该方法能够达到ns级超声波传播时间的测量,使设计的超声波温度计能够实现分辨率优于0.001℃的温度测量。High precision ultrasonic wave thermometer is designed by utilizing characteristic that propagation velocity of ultrasonic wave varies with temperature in medium,and use SOPC based on Nios Ⅱ processor soft core as control core,design high precision ultrasonic wave thermometer.Size and cost are reduced,high frequency signal generator module,high speed signal circuit controll module,signal automatic acquisition controll module and the Nios Ⅱ soft core processor module are all realized on the SOPC.Software subdivision interpolation algorithm is used for accurate measurement of transmitting time that it is proved by theory analysis and experimental verification,this method can realize measurement of ultrasonic wave transmitting time to ns level,which make the designed ultrasonic wave thermometer can realize temperature measurement,whose resolution prior to 0.001 ℃.

关 键 词：超声波温度计 可编程系统级芯片 NIOS Ⅱ 细分插补算法 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]