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  • spherical fresnel lense

    Discussion in 'The main mechanical design forum' started by metobe1, Oct 20, 2010.

    1. metobe1

      metobe1 New Member

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      Hi guys,i have been looking at solar power systems using fresnel lenses,driving stirling type generators.These systems all require some form of solar tracking devise.Question 1 does light travel through a sphere in a direct path.Question 2 does light perform in the same manner through a glass sphere as an acrylic or other clear plastic medium and would a sperical fresnel provide an improved light output.Cheers :)
       
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    3. LinkedIn Gopher

      LinkedIn Gopher Little furry chap

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      Question 1: does light travel through a sphere in a direct path?

      1: I am not sure what you mean by a 'direct path'. Light is subject to refraction and attenuation passing into a more dense medium.

      Question 2.1 does light perform in the same manner through a glass sphere as an acrylic or other clear plastic medium?

      2.1: Yes, depending on what you mean by performance; the materials differ in refractive index, of course. Are you imagining a hollow or a solid sphere?

      Question 2.2 and would a sperical fresnel provide an improved light output?

      2.2 A Fresnel lens is flat. The geometry you would generate from trying to map a Fresnel lens onto a sphere is something a little different. In the case of a Fresnel equivalent of a spherical lens, the transformation would result in a smooth spherical surface. The devil is in the details.

      I understood this to be an optical light gathering device, as in 'light input'. I don't understand the suggestion of improved light "output".

      Cheers :)

      Link to source here
       
    4. Lloyd

      Lloyd Member

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    5. mvalenti

      mvalenti Well-Known Member

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      why did the voice of Dr Evil pop into my head.... sharks with freakin lasers.......
       

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