US Patent 7540449 Methods and apparatus for non-imaging guidance system

Methods and apparatus for a guidance system according to various aspects of the present invention comprise include an energy concentrator configured to transmit an energy entering the entrance through the exit if the energy enters the entrance within a predetermined acceptance angle, and reject the energy entering the entrance if the energy enters the entrance outside the predetermined acceptance angle. The system may further comprise a detector coupled to the exit of the energy concentrator and configured to generate signals corresponding to a location of the transmitted energy incident upon the detector.