Total Focusing Algorithm of Double Layer Media Based on Iterative Process

In order to ensure the position of the refraction point of the double-layer medium in the full-focus imaging algorithm when in immersion test, this paper carries out the time of flight trajectory of the research, put forward by the method of extreme points to look for refraction and put forward the ray intersection method as a Newton iterative method of the initial test point. The theory of this method is deduced to satisfy Snell's law of refraction and Fermat principle. A 64 array full matrix acquisition and full focus imaging algorithm is used to verify the computational efficiency and imaging quality of the extreme iteration method (EIM). The results show that the imaging speed of the EIM is about 50 times faster than that of the analytical solution model.