The Simulation of Ultrasonic Beams with a Gaussian Beam Equivalent Point Source Model
Point Sources and Gaussian beams are used frequently as fundamental building blocks for developing ultrasonic beam models. Point source models can model a wide variety of transducer and inspection geometries and only rely on some well-satisfied high frequency assumptions. They have the disadvantage of being relatively slow and the ray-tracing amplitude laws used in these models can be become singular at focal points and caustics. In contrast, multiGaussian beam models are computationally very efficient and the ray-tracing amplitude laws used for the Gaussian beams are always well-behaved. However, multi-Gaussian beam models are based on the paraxial approximation, which loses accuracy in certain extreme testing situations and they can only model a limited number of transducer shapes and source behaviors. Here, we will show that one can develop a new type of model, called the Gaussian Beam Equivalent Point Source (GBEPS) model that combines the accuracy and versatility of the point source models with much of the speed and well-behaved nature of Gaussian beam models. We will demonstrate the efficiency and versatility of this new GBEPS model in simulating the beams generated from ultrasonic phased arrays.
L. W. Schmerr R. Huang A Sedov
Center for NDE, Iowa State University, Ames, Iowa Department of Mechanical Engineering, Lakehead University, Thunder Bay, ON, Canada
国际会议
2nd China-Korea Ioint Workshop on Ultrasonic Nondestructive Evaluation(第二届中韩双边超声无损评估学术会议)
上海
英文
5-16
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）