基于USB接口的超声TOFD检测系统研制及其应用  

Development and application of ultrasonic TOFD testing system with USB

作　　者：盛朝阳[1] 刚铁[1] 迟大钊[1] 黄江中[1] 李宜男[2] 赵卫君[2] 

机构地区：[1]哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨150001 [2]哈尔滨锅炉厂有限责任公司,哈尔滨150046

出　　处：《焊接学报》2011年第2期9-12,113,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50775054);国际合作基金资助项目(2007DFR70070)

摘　　要：为了定量检测厚壁焊接结构中的缺陷,对基于USB接口的便携式超声衍射时差法(TOFD,time of flight diffraction)的缺陷检测及定位系统进行了研究.为了便于缺陷的定量及定性识别,引入了信号互相关算法,实现了检测图像的校正.利用该检测系统进行了锅炉压力容器焊缝的检测.结果表明,该系统所获得的D扫描图像清晰、直观、易分辨,同时较准确地确定了缺陷位置,信号互相关算法很好地解决了检测图像不连贯的现象.A testing system based on explored ultrasonic TOFD(time of flight diffraction) with USB was presented for thick-walled weld inspection.And the cross-correlation algorithm was used to correct the distorted testing image for defect identification.The system was applied on the boiler weld testing at the workshop.The results show that the D scan image is clear and the defects can be recognized quickly.The distortion of testing image was well avoided by cross-correlation algorithm.The developed system is open,which can be updated according to the requirement.The testing processing can be easily implemented.So the system is suitable for weld detection and could provide referenced data for the quality evaluation of weld.

关 键 词：超声衍射 焊缝检测 信号采集 压力容器检测 图像校正 

分 类 号：TG115.28[金属学及工艺—物理冶金]