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Proceedings Paper

Reflectors for uniform far-field irradiance: fundamental limits and example of an axisymmetric solution
Author(s): Jeffrey M. Gordon; Ari Rabl
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Paper Abstract

We establish a fundamental bound on the field of view over which strictly uniform far-field irradiance can be achieved in symmetric 2D (trough-like) and 3D (cone-like) illumination systems. Earlier results derived for particular 2D devices are shown to be special cases of the general formula. For a rotationally-symmetric 3D luminaire with a lambertian disc light source and a prescribed uniform cone region half-angle (theta) c, no more than tan2((theta) c) can be projected within a uniform core region. Hence the efficiency with which such illuminators can produce uniform flux is severely limited for many problems of practical interest. Being guided by the Tailored Edge-ray Device formalism for the design of 2D luminaires, we develop a 3D reflector that produces extremely uniform far-field illuminance.

Paper Details

Date Published: 3 October 1997
PDF: 7 pages
Proc. SPIE 3139, Nonimaging Optics: Maximum Efficiency Light Transfer IV, (3 October 1997); doi: 10.1117/12.279211
Show Author Affiliations
Jeffrey M. Gordon, Ben-Gurion Univ. of the Negev (Israel)
Ari Rabl, Ecole Normale Superieure des Mines de Paris (France)


Published in SPIE Proceedings Vol. 3139:
Nonimaging Optics: Maximum Efficiency Light Transfer IV
Roland Winston, Editor(s)

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