基于合成孔径聚焦成像的超声衍射时差法图像优化处理
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摘要
为了改善超声衍射时差法(TOFD)检测图像品质,提高缺陷图像的横向分辨率,从基本原理出发,建立了D扫和B扫TOFD图像的合成孔径聚焦成像模型,对提高合成孔径聚焦成像品质的方法进行了研究,实现了TOFD图像的合成孔径聚焦技术与匹配滤波、维纳滤波、旁瓣抑制等算法的综合集成。试验结果表明,提出的合成孔径聚焦成像算法能有效改善TOFD图像质量,增强对缺陷尺寸的横向定量识别,有利于高分辨TOFD技术的实现。
In order to improve Time of Flight Diffraction(TOFD)image quality and lateral defect resolution,a synthetic aperture focusing model for D-scan and B-scan image reconstruction was built based on fundamental principles and then some techniques contributive to image reconstruction such as matched filter,wiener filter and side lobe suppression were studied and integrated in the synthetic aperture focusing technique(SAFT).The final testing results showed that the proposed SAFT could effectively improve TOFD image quality and enhance quantitative recognition of lateral defect,thus providing an important approach of the high resolution TOFD technique.
In order to improve Time of Flight Diffraction(TOFD)image quality and lateral defect resolution,a synthetic aperture focusing model for D-scan and B-scan image reconstruction was built based on fundamental principles and then some techniques contributive to image reconstruction such as matched filter,wiener filter and side lobe suppression were studied and integrated in the synthetic aperture focusing technique(SAFT).The final testing results showed that the proposed SAFT could effectively improve TOFD image quality and enhance quantitative recognition of lateral defect,thus providing an important approach of the high resolution TOFD technique.
引文
[1]李衍.超声衍射时差法探伤和定量技术---焊缝超声检测最新欧洲标准介绍[J].无损检测,2004,26(1):47-53.
[2]李衍.超声TOFD原理和方法要领[J].无损检测,2007,29(2):88-93.
[3]迟大钊,刚铁,袁媛,等.面状缺陷超声TOFD法信号和图像的特征与识别[J].焊接学报,2005,26(11):1-4.
[4]董镌.超声TOFD技术在焊缝检测中的应用及缺陷分析研究[D].兰州:兰州理工大学,2013.
[5]SPIES M,JAGER W.Synthetic aperture focusing for defect reconstruction in anisotropic media[J].Ultrasonics,2003(41):125-131.
[6]PASSMANN C,ERMERT H.A 100-MHz ultrasound imaging system for dermatologic and ophthalmologic diagnostics[J].IEEE Transactions on Ultrasonics,1996,43(4):545-552.
[7]JENSEN J A,ODDERSHEDE N.Estimation of velocity vectors in synthetic aperture ultrasound imaging[J].IEEE Transactions on Medical Imaging,2006,25(12):1637-1644.
[8]SCHUSTER J G,DOCTOR R S,BOND J L.Asystem for high-resoultion,nondestructive,ultrasonic imaging of weld grains[J].IEEETransactions on Instrumentation and Measurement,2004,53(6),1526-1532.
[9]BOEHM R,BRACKROCK D,KITZE J,et al.SAFT for crack surface analysis comparison of modeling and phased array measurements[C]//5th International Workshop of NDT Experts,Prague:[s.n.],2009.
[10]刚铁,迟大钊,袁媛.基于合成孔径聚焦的超声TOFD检测技术及图像增强[J].焊接学报,2006,27(10):7-10.
[11]GANG T,CHI D Z.Novel approach to enhancement of ultrasonic TOFD B-scan image for measurement of weld crack[J].Science and Technology of Welding&Joining,2007,12(1):87-93.
[12]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):59-61,83.
[13]谢雪,祝美丽,杨会敏,等.合成孔径聚焦技术在超声衍射时差法缺陷长度定量中的应用研究[J].机械工程学报,2015,51(18):20-25.
[14]于婧.高性能合成孔径超声成像方法研究[D].沈阳:东北大学,2014.
[15]姚冰.合成孔径声纳成像及目标检测与识别技术的研究[D].哈尔滨:哈尔滨工程大学,2010.
[16]宋志明,李金龙,王黎,等.合成孔径聚焦成像算法研究[J].现代电子技术,2010,33(23):17-20.
[17]艾春安,蔡笑风,李剑,等.干耦合超声波激励信号研究[J].中国测试,2016,42(12):12-17.
[2]李衍.超声TOFD原理和方法要领[J].无损检测,2007,29(2):88-93.
[3]迟大钊,刚铁,袁媛,等.面状缺陷超声TOFD法信号和图像的特征与识别[J].焊接学报,2005,26(11):1-4.
[4]董镌.超声TOFD技术在焊缝检测中的应用及缺陷分析研究[D].兰州:兰州理工大学,2013.
[5]SPIES M,JAGER W.Synthetic aperture focusing for defect reconstruction in anisotropic media[J].Ultrasonics,2003(41):125-131.
[6]PASSMANN C,ERMERT H.A 100-MHz ultrasound imaging system for dermatologic and ophthalmologic diagnostics[J].IEEE Transactions on Ultrasonics,1996,43(4):545-552.
[7]JENSEN J A,ODDERSHEDE N.Estimation of velocity vectors in synthetic aperture ultrasound imaging[J].IEEE Transactions on Medical Imaging,2006,25(12):1637-1644.
[8]SCHUSTER J G,DOCTOR R S,BOND J L.Asystem for high-resoultion,nondestructive,ultrasonic imaging of weld grains[J].IEEETransactions on Instrumentation and Measurement,2004,53(6),1526-1532.
[9]BOEHM R,BRACKROCK D,KITZE J,et al.SAFT for crack surface analysis comparison of modeling and phased array measurements[C]//5th International Workshop of NDT Experts,Prague:[s.n.],2009.
[10]刚铁,迟大钊,袁媛.基于合成孔径聚焦的超声TOFD检测技术及图像增强[J].焊接学报,2006,27(10):7-10.
[11]GANG T,CHI D Z.Novel approach to enhancement of ultrasonic TOFD B-scan image for measurement of weld crack[J].Science and Technology of Welding&Joining,2007,12(1):87-93.
[12]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):59-61,83.
[13]谢雪,祝美丽,杨会敏,等.合成孔径聚焦技术在超声衍射时差法缺陷长度定量中的应用研究[J].机械工程学报,2015,51(18):20-25.
[14]于婧.高性能合成孔径超声成像方法研究[D].沈阳:东北大学,2014.
[15]姚冰.合成孔径声纳成像及目标检测与识别技术的研究[D].哈尔滨:哈尔滨工程大学,2010.
[16]宋志明,李金龙,王黎,等.合成孔径聚焦成像算法研究[J].现代电子技术,2010,33(23):17-20.
[17]艾春安,蔡笑风,李剑,等.干耦合超声波激励信号研究[J].中国测试,2016,42(12):12-17.