基于FPGA的高精度超声波温度计设计

以超声波在介质中的传播速度随温度变化而变化的特点为设计原理,以FPGA为控制核心,设计了高精度超声波温度计。在FPGA上同时实现了高速信号控制模块、高频信号发生器模块、信号自动采集控制模块以及NIOS II软核处理器模块,解决了设计的关键性技术问题,并通过处理器实现了特殊的软件细分插补算法来对采集的数据进行分析处理。通过理论分析和实验,验证了该方法能够达到纳秒级超声波传播时间的测量,从而使设计能够实现分辨率优于0.001℃的温度测量。

Design of novel precision ultrasonic thermometer based on FPGA

The ultrasonic thermometer is designed by utilizing the characteristic that the velocity of the ultrasonic varies with the temperature through the medium.It solved the key problem that a high speed controller,the high frequency signal generator,automatic signal acquisition and the NIOS II are realized on FPGA as the SOPC.The special subdivision algorithm is used for processing the data of acquisition and brings the measure of the ultrasonic wave transmitting time to nanosecond level,which is proved by theory and experiment in the paper.In this way,the design can bring about the novel precision temperature measurement,whose resolution may be better than 0.001 centigrade.