基于FPGA的时差法超声波流量计的设计

设计了一种基于现场可编程门阵列（FPGA）的时差法超声波流量计。主要介绍了系统的硬件组成和实现方法，概述了软件功能和软件设计流程。系统硬件电路为微控制器＋FPGA结构，微控制器是系统的控制核心。利用FPGA的可编程特性和很高的工作频率以及丰富的内部资源设计了包括高速计数器．在内的数字信号处理模块，提高了系统的可靠性和测量精度，并具有良好的硬件可升级性。

Design of travel time difference method ultrasonic flowmeter based on FPGA

A travel time difference method ultrasonic flowmeter based on field programmable gate array (FPGA) is designed. The hardware structure and realization method are introduced. The software function and work mode are overviewed. The hardware structure of the system is microcontroller +FPGA. The microcontroller is the control center. Making use of the programmable characteristic, the rich inner resources and very high work frequency of a FPGA chip,a date signal processes module including a high speed counter is designed. The reliability and the measurement precision of system are improved. And the hardware can be upgraded more easily.