The application of Fermat's principle for imaging anisotropic and inhomogeneous media with application to austenitic steel weld inspection

被引：18
|
作者：
Connolly, George D. [1 ]
Lowe, Michael J. S. [1 ]
Temple, J. Andrew G. [1 ]
Rokhlin, Stanislav I. [2 ]
机构：
[1] Univ London Imperial Coll Sci Technol & Med, UK Res Ctr NDE, London SW7 2AZ, England
[2] Ohio State Univ, Edison Joining Technol Ctr, Columbus, OH 43221 USA
来源：
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2009年 / 465卷 / 2111期
关键词：
austenitic steel; weld inspection; ultrasonics; RAY TRACING MODEL; PLANE INTERFACE; WAVES; REFLECTION; PROPAGATION; TRANSMISSION; PHASE;
D O I：
10.1098/rspa.2009.0272
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Ultrasonic inspection in anisotropic and inhomogeneous media has long presented a challenge because of the complex steering of ultrasonic paths. An approach is presented in which the true geometry of a previously used austenitic steel weld model is distorted so that, from one viewing location, all ultrasound travels in straight lines with a constant isotropic velocity. The mapping from the real space to this distorted space is accomplished using Fermat's theorem of least travel time applied through ray tracing. Applications specific to inspection design and data interpretation for manual ultrasonic inspection of welds in austenitic steel plates are given. Validation of some intermediate results is provided using finite element analysis.
引用
收藏
页码：3401 / 3423
页数：23
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