In order to satisfy the flow measurement precision for big-pipe,multi-paths ultrasonic flow measurement system based FPGA(Field Programmable Gate Array) and phase lock loop(PLL) was developed.

• 为了满足大管径流量的测量精度,研制了基于现场可编程门阵列器件FPGA和锁相环路的多声路超声波流量测量系统。