A new ray tracing method based on linear travel-time interpolation
In the application of industrial flaw detection,the materials to be detected are often a collection of a background area and a small amount of defect areas.In traditional linear travel-time interpolation (LTI) method,the assumption of travel-time linearity will lead to error accumulation when the rays go through multiple cells.In order to reduce the cumulative error in this application,a new ray tracing method is proposed based on linear travel-time interpolation.In our method,calculation points are located on the boundaries between different areas to determine the angle of refraction.Moreover,the minimum travel-time of each point is computed by multidirectional loop strategy,which will make the traced ray path conforms to the condition of minimum travel-time when ray transports from the reverse direction.The simulation results show that using the proposed method to calculate travel-times and paths of tracing rays,it is more rapid and accurate than traditional LTI method and cross-scanning LTI method.
ultrasonic computed tomography (UCT),ray tracing,linear travel-time interpolation (LTI),minimum travel-time
Lingjun Liu Zhonghua Xie Cui Yang
School of Electronic and Information Engineering, South China University of Technology,Guangzhou, China
国际会议
重庆
英文
845-851
2015-03-21（万方平台首次上网日期，不代表论文的发表时间）