Realization and simulating computation of ray-tracing programbased on the law of Snell

Abstract：The ray_tracing method that based on the law of Snell is studied and realized in a program. Since the variation range of root is large in the process of ray_tracing, half_separated method was utilized to remove the dependence of iterative initial value. The shortest paths of the lowest ultrasonic velocity areas that existed in a medium were traced by the second ray_tracing method. Several common velocity models of concrete were simulated with a program realized in VB. It shows that this method is very straightforward and can trace the shortest path, and the tracing path is more close to ultrasonic propagating path.

Keyword：raytracing; the law of Snell; ultrasonic; concrete; simulating computation;