FPGA在全长全覆盖钢管测厚系统中的应用

Application of FPGA in wall-thickness measurement system of full-length coverage for steel pipe

美国石油学会最新颁布API标准,要求对石油钢管进行全长全覆盖测厚。文章根据超声脉冲反射法原理,采用4组32个超声探头和可编程门阵列(FPGA)的器件,将前端电路控制、高速计数器、数据处理以及与上位机数据通信集于FPGA内,研究并设计了钢管全长全覆盖测厚系统。实验表明,FPGA的高时钟、众多的I/O口及强大逻辑功能可以实现对32探头进行时分复用控制,以及对厚度信号的采集和传输功能;同时,100 MHz的时钟采集精度可满足实际生产的要求。

The latest standards of the American Petroleum Institute（API） require that the wall-thickness of oil steel pipe should be measured with full length and full coverage.In this paper,based on the principle of ultrasonic pulse reflection method,a wall-thickness measurement system of full-length coverage for steel pipe is proposed and studied.Four groups of 32 ultrasound probes and field programmable gate array（FPGA） devices are used,and the foreside circuit control module,high-speed counter,data processing and communication module with the host computer are integrated to the FPGA devices.The experiment demonstrates that with the high-speed clock,a large number of I/Os and powerful logic function of FPGA,the time-division multiplexing control on the multi-probes and the thickness signal acquisition and transmission can be achieved.Consequently,acquisition precision of 100 MHz clock satisfies the practical requirements.