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I remember reading about devices which were roughly hyperboloid in shape that had the property of focusing light from a much wider range of incidence angles than a parabollic antenna. I think they were used to power solar stirling engines. Id like to read about those again but i dont remember what these devices were called. Does anyone know what im talking about?

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    $\begingroup$ In general, these are non-imaging systems. They maximize total irradiance within a specified radius on the image plane, rather than a resolvable image. $\endgroup$ Jan 27, 2022 at 14:32

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The general term for these are Compound Parabolic Concentrators. These were invented by Roland Winston, the person who literally wrote the book on non-imaging optics. I once attended a lecture by him and bought the book.

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    $\begingroup$ @CarlWitthoft The OP used the word hyperbolic. I believe he is confused and CPCs are what he is looking for. I went to a lecture by Roland Winston who literally wrote the book about these and other non-imaging optics once upon a time. $\endgroup$
    – Eric S
    Jan 27, 2022 at 16:58
  • $\begingroup$ that makes sense. I'll delete my question $\endgroup$ Jan 27, 2022 at 18:29
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Now i remember it, they're called Winston cones.

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  • $\begingroup$ This would be more useful if you provided a link, a picture, and a brief discussion of how they work. $\endgroup$ Jan 27, 2022 at 14:29

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