Wide angle solar concentrator

Abstract

A non-imaging optical collecting and concentrating apparatus for use in i.e., optical communications, passive lighting, and solar power applications that is relatively immune from optical incidence angle(s) and therefore does not need to track the movement of the sun to efficiently collect and concentrate optical energy is described. The apparatus includes a tubular support structure having a source-facing entrance and an energy-outputting exit. An interior surface of the structure includes a scattering, reflecting and / or diffractive medium to direct incident energy toward an exit of the tubular structure, such that the rays exiting the tube are more collimated and substantially more parallel to the axis of the tube. The collimated beam is then focused or directed by a lens or similar optical element toward a point where the energy may be collected by a detector, optical fiber, or other collection means.

Description

FIELD OF THE INVENTION [0001] This invention relates generally to the fields of optics, solar energy, and lighting and in particular to an apparatus that efficiently collects and concentrates incident optical energy over a wide range of incident angles. BACKGROUND OF THE INVENTION [0002] The efficient collection, concentration and distribution of solar energy remain some of the most significant, yet persistent problems of contemporary society. Its importance cannot be overstated. As fossil fuels continue to dwindle in supply and contribute to undesirable environmental effects, the importance of solar energy will only increase. Efforts to realize the potential(s) of solar energy—and in particular efforts directed toward the efficient collection and concentration of solar energy—are therefore of great significance. [0003] The prior art has produced a variety of solar energy collectors and concentrators having a solar energy receiver upon which solar energy to be collected is directed....

AI Technical Summary

Problems solved by technology

The efficient collection, concentration and distribution of solar energy remain some of the most significant, yet persistent problems of contemporary society.

As fossil fuels continue to dwindle in supply and contribute to undesirable environmental effects, the importance of solar energy will only increase.

These methods typically are limited by the range of acceptance angle of the optical system (i.e. they cannot collect over a wide range of incident solar angles), or are not truly non-imaging (i.e. they produce a poor image which still moves on the receiver as the sun moves relative to the collector).

Reflectors, lenses, Fresnel lenses, and similar optical instruments are all limited by this constraint.

While the devices of Afian et al and Rosenberg do make use of multiple diffraction events to steer a light ray, they are limited to planar formats and rely on partial transmission of the optical radiation through the hologram.

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