21 August 1995 Redirecting concentrated radiation
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Abstract
Often the direction of radiation is important for technological reasons. Melting substances may drip down, or for air receivers, convection may cause instabilities. One obvious solution is to reorient the radiation before concentration with a planar mirror. This is only practical, if the angular spread is considerably less than 45 degrees. Here we propose a section of a torus with reflecting walls to reorient the radiation. The torus, by virtue of its rotational symmetry will not reject any radiation, even if the incoming radiation is close to the thermodynamic limit and thus completely diffuse. A toroid reflector can be easily manufactured from massive material and cooled. It seams a compact and practical device. We calculate the number of reflections and discuss applications of such a device in solar furnaces.
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Manuel Collares-Pereira, Manuel Collares-Pereira, Joao Farinha Mendes, Joao Farinha Mendes, Ari Rabl, Ari Rabl, Harald Ries, Harald Ries, } "Redirecting concentrated radiation", Proc. SPIE 2538, Nonimaging Optics: Maximum Efficiency Light Transfer III, (21 August 1995); doi: 10.1117/12.216975; https://doi.org/10.1117/12.216975
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