FPGA-based High-precision Measurement Algorithm for the Ultrasonic Echo Time of Flight

基于优点的评估和测量算法的高精确的数字时间间隔的劣势，并且与典型时差的原则结合了超声的流动测量，远，飞行的回响时间的测量由超声的流动测量提出了的要求是 an-alyzed.A 新高精确的时间间隔测量算法被介绍，它联合与阶段延期插值数方法的脉搏。数方法的脉搏被用来保证一个大动态测量范围，并且相反被触发的一个双边被设计改进精确性并且减少数的量子化 error.The 阶段延期插值被用来减少脉搏为进一步改进时间测量 resolution.Test 数据表演数的量子化错误为飞行的超声的回响时间的测量的系统基于这个算法并且在一个地可编程的门数组( FPGA )

Based on the evaluation of advantages and disadvantages of high-precision digital time interval measuring algorithms, and combined with the principle of the typical time-difference ultrasonic flow measurement, the requirements for the measurement of echo time of flight put forward by the ultrasonic flow measurement are analyzed. A new high-precision time interval measurement algorithm is presented, which combines the pulse counting method with the phase delay interpolation. The pulse counting method is used to ensure a large dynamic measuring range, and a double-edge triggering counter is designed to improve the accuracy and reduce the counting quantization error. The phase delay interpolation is used to reduce the quantization error of pulse counting for further improving the time measurement resolution. Test data show that the systexn for the measurement of the ultrasonic echo time of flight based on this algorithm and implemented on an Field Programmable Gate Army（FleA） needs a relatively short time for measurement, and has a measurement error of less than 105 ps.