Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (5): 23-28,35.doi: 10.3969/j.issn.1000-565X.2014.05.004

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Ray Tracing Algorithm Based on Boundary Linear Traveltime Interpolation

Liu Ling- jun Xie Zhong- hua Yang Cui   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-11-14 Revised:2013-12-24 Online:2014-05-25 Published:2014-04-01
  • Contact: 杨萃(1983-)，女，博士，讲师，主要从事超声探测、参数估计研究． E-mail:yangcui@scut.edu.cn
  • About author:刘玲君(1983-)，女，博士生，主要从事超声层析研究．E-mail:liu_lingjun@qq．com
  • Supported by:

    国家 “973” 计划项目(2011CB707003);NSFC- 广东省联合基金资助项目(U1035003);国家自然科学基金资助项目(61201349);华南理工大学中央高校基本科研业务费专项资金资助项目(2014ZZ0032)

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Abstract:

In the traditional ray tracing algorithm on the basis of linear traveltime interpolation (LTI),rays trans-mitting through multiple grids may cause error accumulation due to the linear assumption.When the algorithm isapplied to the computerized tomography for industrial flaw detection,the materials to be detected often become acollection of the background and a small amount of defect areas.In order to reduce the accumulative error in thisapplication,a new ray tracing algorithm on the basis of boundary LTI is proposed.In this algorithm,nodes are in-serted on the boundary of different areas to determine rays' refractional angle and to further reduce the accumulativeerror,and the multidirectional cyclic scanning is used for reference to guarantee the ray path when rays transmit ina reverse direction.Simulated results show that the proposed algorithm is superior to the traditional LTI algorithmand the cross- scanning LTI algorithm due to its high traveltime computing accuracy and ray path- tracing accuracy.

Key words: ultrasonic computerized tomography, ray tracing, linear traveltime interpolation, minimum traveltime

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