ZHAO Xia, WANG Zhao-ba, LIU Bin
(Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China)
Abstract： Phase aberration correction for medical ultrasound systems has attracted a great deal of attention. Since phased array techniques are now widely employed for industrial non-destructive testing (NDT) applications in various fields, the problem of phase aberrations in the process of NDT testing is considered. The technique of cross-covariance for phase aberration correction is presented. The performance of the technique for phase aberration correction is tested by means of echo signals obtained in practical non-destructive testing experiment. The results show that the technique has the better accuracy of phase correction.
Key words： ultrasonic phased array; non-destructive testing; phase aberration; correction; cross-covariance method
CLD number： TN911.7Document code： A
Article ID： 1674-8042（2015）01-0047-06 doi： 10.3969/j.issn.1674-8042.2015.01.009
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超声相控阵检测回波信号相位偏差校正技术研究
赵霞， 王召巴, 刘宾
（中北大学 电子测试技术国家重点实验室， 山西 太原 030051）
摘要:近年来, 超声相控阵技术广泛应用于工业无损检测领域。 在检测过程中， 检测材料和检测系统等方面的扰动因素会造成超声检测回波信号明显的相位偏差， 影响检测效果。 本文分析研究了造成检测信号产生相位偏差的原因以及对检测效果造成的影响， 提出采用信号互协方差分析法实现检测回波信号相位偏差校正。 实验结果表明， 该方法可有效校正各通道回波信号的相位偏差， 提高检测精度。
关键词:超声相控阵； 无损检测； 相位偏差； 校正； 互协方差分析法
引用格式：ZHAO Xia, WANG Zhao-ba, LIU Bin. Phase aberration correction in ultrasonic phased array non-destructive testing systems. Journal of Measurement Science and Instrumentation, 2015, 6(1)： 47-52. ［doi： 10.3969／j.issn.1674-8042.2015.01.009］
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