METHOD FOR FOCUSING OF WAVE FIELD Russian patent published in 2009 - IPC F24J2/06 

FIELD: physics, optics.

SUBSTANCE: invention is related to the field of optics, in particular to methods and facilities for transformation of wave field with provision of possibility of its focusing. Method consists in the fact that wave field 1 is transformed into two flows of radiation - 2 and 3. Each flow 2 and 3 is diverged by specified (from focusing condition) angles in one of two zones of wave field 1. Each zone is separated by means of installation of ordered set (OS) of identical focusing structures (FS) 4 and 5 in the form of sequence of discrete functional elements (DFE) with reflecting surfaces, combination of acting apertures of which creates apertures of appropriate OS. Transformation of wave field 1 is realised by means of the first FS OS arranged along with direction of beams 4 and 5. Specified FS 4 and 5 in OS are arranged with helical shape with length of DFE reflecting surfaces that increases from centre of OS apertures to their periphery, and sequence of reflecting surfaces is formed in FS 4 and 5 of stepped shape and is spatially organised with generation of input and output OS apertures with properties of rotary symmetry by combination of their acting apertures. For this purpose FS 4 and 5 in OS are distributed invariantly relative to rotation with pitch that is permanent by angle. Orientation of FS 4 and 5 in OS is realised so that shadow from n FS 4 of OS that is first along with direction of beams is located between n-1 and n+1 FS 5 of the second OS, partially covering them. Mentioned FS 4 and 5 in every OS are organised under condition of 2 and 3 radiation flows divergence by specified angles with formation of focal spot 9 common for both OS in space between them. For this purpose OS is formed so that for the first OS installed along with direction of radiation, surface that envelopes it from the side of input aperture is convex, from the side of output aperture - concave, and for the second OS surface that envelopes it from the side input aperture is concave, and from external side - convex. Radiuses of curvature of meridional sections of reflecting surfaces of DFE in each FS 4 and 5 are related by a certain dependence.

EFFECT: reduced dimensional parametres, optimisation of efficiency (from energy point of view) of radiation flow directivity diagram, distribution in zone of functional surface of receiver, improved stability of power system to wind loads.

3 cl, 6 dwg