基于SAFT提高TOFD检测缺陷长度定量精度的探讨
The Inquiry of Improving Quantitative Accuracy of Flaw Length in TOFD Technique Based on SAFT
摘 要
针对超声衍射时差(TOFD)方法中由于存在甩弧现象导致缺陷长度测量误差大的问题,借助CIVA仿真软件及合成孔径聚焦技术(SAFT),对长度范围5.0~45.0 mm的9个矩形槽的D扫图像进行处理与重建.结果表明,D-SAFT处理技术能够有效降低干扰衍射信号的影响,使缺陷甩弧现象减弱甚至消失,缺陷最大测量误差由处理前的最大5.0 mm降低至0.6 mm.此外,对Farhang等人提出的变角度解卷积(ADD)结合SAFT方法(SAFTADD)在提高TOFD缺陷定量精度上的应用前景进行了展望.
合成孔径聚焦技术
缺陷长度定量
变角度解卷积
Time of flight diffraction
Synthetic aperture focusing technology
Quantitation of flaw length
Angle dependent deconvolution
Abstract
In ultrasonic time of fight diffraction (TOFD) inspection,the arcs at the ends of flaws will reduce the quantitative accuracy of flaw length.To solve this problem,numerical simulation with CIVA software was performed,and the synthetic aperture focusing technology (SAFT) was developed to process and reconstruct the D-scan image.Nine rectangular defects with the lengths ranged from 5.0 to 45.0mm were investigated.The results showed that D-SAFT processing technique was effective to weaken the arcs of flaw,and the maximum defect quantitative error was reduced from 5.0mm to 0.6mm.In addition,based on the angle dependent deconvolution (ADD) method combined with SAFT,the improving method of flaw quantitative accuracy in TOFD technique was prospected.
中图分类号 TG156 TG115.28
所属栏目 无损检测新技术发展专题
基金项目 十二五国防技术基础科研资助项目(Z022014T001);大连理工大学引进人才科研资助项目(DUT14RC(3)135)
收稿日期 2014/10/14
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备注谢雪(1990- ),女,硕士研究生,主要从事超声TOFD检测技术研究.
引用该论文: XIE Xue,ZHU Mei-li,JIN Shi-jie,YANG Hui-min,CUI Zhe,ZHANG Dong-hui,LIN Li,ZHANG Shu-xiao,LIU Li-li. The Inquiry of Improving Quantitative Accuracy of Flaw Length in TOFD Technique Based on SAFT[J]. Nondestructive Testing, 2015, 37(5): 18～21
谢雪,祝美丽,金士杰,杨会敏,崔哲,张东辉,林莉,张树潇,刘丽丽. 基于SAFT提高TOFD检测缺陷长度定量精度的探讨[J]. 无损检测, 2015, 37(5): 18～21
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【3】MANJULA K,VIJAYAREKHA K,VENKATRAMAN B,et al.Ultrasonic time of flight diffraction technique for weld defects:A review[J].Research Journal of Applied Sciences,Engineering and Technology,2012,4(24):5525-5533.
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【5】SILK M G.An evaluation of the performance of the TOFD technique as a means of sizing flaws,with particular reference to flaws with curved profiles[J].Insight,1996,38(4):280-287.
【6】迟大钊,刚铁,盛朝阳.超声渡越时差法检测图像中裂纹端部信号的识别[J].机械工程学报,2007,43(10):103-107.
【7】SPIES M,RIEDER H,DILLHFER A,et al.Synthetic aperture focusing and time-of-flight diffraction ultrasonic imaging—past and present[J].Journal of Nondestructive Evaluation,2012,31(4):310-323.
【8】SINCLAIR A N,FORTIN J,SHAKIBI B,et al.Enhancement of ultrasonic images for sizing of defects by time-of-flight diffraction[J].NDT & E International,2010,43(3):258-264.
【9】周靖宇,林丹源,陈建华,等.合成孔径聚焦技术在 TOFD 检测中的应用[J].无损检测,2012,34(5):59-61.
【10】王子成.合成孔径聚焦(SAFT)算法在衍射时差法(TOFD)检测中的应用[C]∥2009远东无损检测新技术论坛论文集.苏州:[出版地不详],2009.
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【13】STEPINSKI T,LINGVALL F.Optimized algorithm for synthetic aperture imaging[C]∥2004 IEEE Ultrasonics Symposium.Sweden:Uppsala University,2004:701-704.
【14】HONARVAR F,SHEIKHZADEH H,MOLES M,et al.Improving the time-resolution and signal-to-noise ratio of ultrasonic NDE signals[J].Ultrasonics,2004,41(9):755-763.
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