Enhanced Ultrasonic Flaw Detection Using an Ultrahigh Gain and Time-Dependent Threshold

被引：24

作者：

Song, Yongfeng ^{[1
]}

Turner, Joseph A. ^{[2
]}

Peng, Zuoxiang ^{[3
]}

Chen, Chao ^{[4
]}

Li, Xiongbing ^{[1
]}

机构：

[1] Cent S Univ, Sch Traff & Transportat Engn, Changsha 410075, Hunan, Peoples R China

[2] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

[3] Southwest Univ, Sch Math & Stat, Chongqing 400715, Peoples R China

[4] Cent S Univ, State Key Lab Powder Met, Changsha 410075, Peoples R China

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2018年 / 65卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Extreme value theory; grain noise statistics; image segmentation; time-dependent threshold; ultrahigh gain; ultrasonic C-scan; SCATTERING; BACKSCATTER; POLYCRYSTALS; OPTIMIZATION; STRESS; STEEL;

D O I：

10.1109/TUFFC.2018.2827464

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

In an attempt to improve the ultrasonic testing capability of a conventional C-scan system, a flaw detection method using an ultrahigh gain is developed in this paper. A time-dependent threshold for image segmentation is applied to identify automatically material anomalies present in the sample. A singly scattered response model is used with extreme value statistics to calculate the confidence bounds of grain noise. The result is a time-dependent threshold associated with the grain noise that can be used for segmentation. Ultrasonic imaging experiments show that the presented method has advantages over a traditional fixed threshold approach with respect to false positives and missed flaws. The results also show that a low gain is adverse to the detection of microflaws with subwavelength dimensions. The forward model is expected to serve as an effective tool for the probability of detection of flaws and the inspection of coarse-grained materials in the future.

引用

页码：1214 / 1225

页数：12

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