Study on laser reflection from the two-dimensional random and rough sea surface

Abstract

When the incidence laser comes to the two-dimension random and rough sea surface, the reflected light is different from the light on the smooth sea surface. The rough sea surface can be divided into several tiny planes with several different normal directions. The width or length of every plane is much greater than the wave length of the incidence laser, so we can employ geometrical optical method to study the laser reflection from the random and rough sea surface. We simulate the two-dimensional random and rough sea surface based on JONSWAP spectrum, and divide the sea surface covered by the incidence laser facular into several tiny planes. After that, we simulate reflected laser beam from every minute plane with ray tracing, and then get the space distribution of intensity of reflected laser rays from sea surface. A program is developed to simulate reflected laser beam at different incedent angle and sea surface at different wind speed. The result shows that the intensity of specular reflection reduces and the intensity of diffuse reflection increases with the increasing roughness of the sea surface.