一种时差式超声波流量计及其简化算法

Time Difference Ultrasonic Flowmeter and Its Simple Arithmetic

针对时差法超声波流量计时间测量精度高、运算量大的特点,设计了一种结合可编程逻辑器件(FPGA)、数字信号处理器(DSP)和单片机的超声波流量计系统。系统的硬件时序由FPGA控制,确保时序准确,软件利用滑动窗口接收技术,提取有用测量信号,减少了需要处理的数据并增强了抗干扰能力,最后对相关算法进行简化,大大加快了测量速度。通过Matlab仿真比较及实验测试,证明该方案可行。

Aiming at the high precision time measurement and large amount computing of time difference ultrasonic flowmeter,an ultrasonic flowmeter system based on FPGA,DSP and MCU is designed. The hardware controlled by the FPGA to ensure accurate timing. The auto delay- window of signal receive technique is adopted, by extracting useful measurement signal,the needed data is reduced and anti- jamming capabilit is enhanced, and the measuring speed has been greatly accelerated by simplified algorithms. It is proved by simulator with Matlab and experiment that the system is feasible.