基于FPGA的超声TOFD焊缝探伤数据采集系统的设计  

Design of data acquisition system on ultrasonic TOFD weld testing based on FPGA

作　　者：沈国平[1] 宋光德[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《计算机测量与控制》2009年第1期231-233,共3页Computer Measurement &Control

摘　　要：针对传统超声探伤数据采集系统采样速率低、处理速度慢、实时性差的问题,设计了一种高速数据采集系统;该系统以超声TOFD法为理论依据,可根据不同的检测对象,由上位机设置不同的参数,并传递给FPGA以控制数据采集时序,这样的设计极大地提高了系统的灵活性和适应性;高速模数转换芯片AD9288的应用,使系统的采样速率达到了200MSPS,有利于回波信号缺陷最值的获取;实验结果表明,系统方案完全可行,具有一定的实用和推广价值,对于其它超声探伤仪的研制也有很大的参考意义。To resolve the problems of low sampling and management speed, bad real time performance on traditional ultrasonic testing data--acquisition systems, One new system is designed. This system is based on the principle of TOFD in ultrasonic weld detecting and Control parameters can be set by PC according as different testing objects, and then transferred to FPGA to control the data acquisition sequence. As it, system can adapt inlarger areas. AD9288 as a high--speed ADC chip can design to the sampling speed of 200MSPS, so the extreme value of weld echo can be easily sampled. Experiment results show that the scheme adopted in this system is absolutely feasible, and has great reference value in the development of other ultrasonic testing instruments,

关 键 词：TOFD 焊缝 高速数据采集 FPGA 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置] TG115.28[自动化与计算机技术—控制科学与工程]