Image Science Research for Speckle-based LADAR (Speckle Research for 3D Imaging LADAR); Technical rept. 15 Aug 2006-14 Feb 2008

摘要

We propose a basic study of image science topics related to a new class of speckle-based laser-ranging radars (LADAR). For this imaging radar we study two basic system configurations: a wavefront sensing configuration and an imaging configuration. Three major research projects are (1) study of speckle patterns to establish 3D qualitative features for a remote object (2) study of performance of this compact ladar at photon counting light levels and (3) space and wavelength dependence of speckle for a thick diffuser. A balanced research program of theory computer simulations and laboratory experiments is planned These will feature low light level speckle studies with tunable/ multi-tone lasers. For the first area of study, we develop a new thick diffuser for studies of turbidity and imaging. The diffuser consists of three to five different polysterene spheres emmersed in agar. Additionally were have published a paper describing the first infrared hologram at 10.6 microns. It is expected to be useful for examination of silicon boules. In this study we will employ machine vision techniques and neutral networks to ascertain the minimum number of photons that are required to set the boundaries or shape contours of a speckle. The study of space and wavelength dependence of speckle for a thick diffuser is important for assessing LADAR system performance in the presence of fog or smoke in the atmosphere. We seek to establish the capacity for these LADARS to see through turbulence and turbidity. Major objectives of this research are to contribute to the understanding of speckle phenomena and the feasibility of remote object classification using novel 3D-imaging means.