摘要
设计了一种针对液体介质的超声波测温系统,实现对液体温度的快速、高精度的测量。提出了一种优化阈值比较法,在传统阈值比较法的基础上,对信号的脉冲宽度进行判定,以便更精准地确定超声波传播的终点时刻,同时采用基于抽头延迟链的TDC结构设计提高时间测量的分辨率,通过建立超声波传播速度与液体温度之间的关系来实现温度的精准测量。实验结果表明:系统可以达到10-12 s的时间测量分辨率,平均测量误差为0.008×10^(-9) s,实现分辨率0.001℃的温度测量,相比传统温度计具有更快的响应速度和更高的灵敏度。
This paper designs an ultrasonic temperature measurement system for liquid media to achieve rapid and high-precision measurement of liquid temperature.An optimized threshold comparison method is proposed.To more precisely define the end moment of ultrasonic wave propagation,the pulse width of the signal is determined based on the conventional threshold comparison method.At the same time,the TDC structure design based on the tap delay chain is utilized to improve the resolution of time measurement,and the relationship between ultrasonic wave propagation speed and liquid temperature is established to achieve accurate temperature measurement.According to the experimental findings,the system is capable of measuring temperature at a resolution of 0.001℃by reaching the time measurement resolution of 10-12 s,with an average measurement error of 0.008×10^(-9) s.It also has a faster response speed and a higher sensitivity than conventional thermometers.
作者
张兴红
任丽汾
ZHANG Xinghong;REN Lifen(Liangjiang International College,Chongqing University of Technology,Chongqing 401135,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2023年第4期253-259,共7页
Journal of Chongqing University of Technology：Natural Science
基金
重庆理工大学研究生创新项目(clgycx 20203157)。
关键词
超声波测温
FPGA
时间测量
TDC
高精度
ultrasonic temperature measurement
FPGA
time measurement
TDC
high precision
