一种精密测量超声波传输时间的方法  

A Method to Precisely Measure Ultrasonic Transmission Time

作　　者：张兴红[1] 张慧[1] 陈锡侯[1] 王先全[1] 冯济琴[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,重庆400054

出　　处：《北京理工大学学报》2011年第6期717-721,共5页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(50975304);博士后科学基金资助项目(20080430097)

摘　　要：针对超声波传输时间精密测量的要求,提出了一种精密测量超声波传输时间的方法.该方法以高分辨率高精度A/D和高速FPGA作为硬件核心,保证了超声波回波信号采样数据的高分辨率和实时性.精密测量超声波传输时间的软件算法综合了整个超声波回波信号采样数据,利用细分插补算法精确计算超声波传输时间的终点时刻,保证了超声波传输时间测量的高精度.实验表明,该方法能够在不增加生产成本的前提下,达到ns级,乃至ps级的超声波传输时间精密测量.In accordance to the requirements of precisely measuring ultrasonic transmission time, a measurement method with high precision was proposed. The high-resolution A/D and high- speed FPGA were adopted as the core of hardware system to guarantee the instantaneity of ultrasonic echo. The sample data of entire ultrasonic echo were synthesized in software algorithm, and the arithmetic of software interpolation subdivision was employed to accurately calculate the end point of ultrasonic transmission time, so that the precision measurement of ultrasonic transmission time was ensured. Experiments show that, without increasing production costs, the method achieves the accuracy of measuring ultrasonic transmission time in nanoseconds level, even in picoseconds level.

关 键 词：超声波传输时间 精密测量 软件细分 回波信号 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]