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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 5 — Feb. 10, 2013
  • pp: 1100–1109

Optics of hemispherical top dome and its effect on tubular light guide efficiency: diffuse light case

Ladislav Kómar and Miroslav Kocifaj  »View Author Affiliations

Applied Optics, Vol. 52, Issue 5, pp. 1100-1109 (2013)

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To predict the energetic effectiveness of a tubular light guide accurately, a theoretically founded approach has to be used rather than any empirical approximation. The computed illuminance below a light guide can become inaccurate if neither Fresnel’s equations nor realistic optical path lengths in a cupola are taken into consideration. It is shown that incorporation of both of them into a theoretical model results in lowered luminous flux below the light guide. Assumption of directionally independent transmission coefficient leads to average errors in luminous fluxes of about 10%. The peak errors are typically higher and correspond to lightbeams crossing a hemispherical top dome near its circular base. The solution concept used in this paper can improve predictions of energetic effectiveness for tubular light guides under diffuse daylight conditions.

© 2013 Optical Society of America

OCIS Codes
(080.1753) Geometric optics : Computation methods
(220.2945) Optical design and fabrication : Illumination design
(080.3685) Geometric optics : Lightpipes

ToC Category:
Optical Design and Fabrication

Original Manuscript: October 9, 2012
Revised Manuscript: December 5, 2012
Manuscript Accepted: December 5, 2012
Published: February 8, 2013

Ladislav Kómar and Miroslav Kocifaj, "Optics of hemispherical top dome and its effect on tubular light guide efficiency: diffuse light case," Appl. Opt. 52, 1100-1109 (2013)

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