| 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. |
| 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 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50775054);国际合作基金资助项目(2007DFR70070) |
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| Development and application of ultrasonic TOFD testing system with USB |
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SHENG Zhaoyang1, GANG Tie1, CHI Dazhao1, HUANG Jiangzhong1, LI Yinan2, ZHAO Weijun2
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1.State Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;2.Harbin Boiler Company Limited, Harbin 150046, China
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| Abstract: |
| 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. |
| Key words: ultrasonic diffraction weld testing signal collection pressure vessel testing image correction |
