Reflectors for uniform far-field irradiance: Fundamental limits and example of an axi-symmetric solution

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    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.

    Original languageEnglish
    Pages (from-to)2-8
    Number of pages7
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Volume3139
    DOIs
    StatePublished - 1 Dec 1997
    EventNonimaging Optics: Maximum Efficiency Light Transfer IV - San Diego, CA, United States
    Duration: 27 Jul 199727 Jul 1997

    Keywords

    • Illumination
    • Nonimaging
    • Optical design
    • Uniform irradiance

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