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Optical Engineering

Orientation invariant light source parameters
Author(s): Robert D. Stock; Mel Siegel
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Paper Abstract

At present there is no common language for comparing two different light sources. Trying to quantify (or even to explain qualitatively) the difference in performance terms, for example, of an axial and a transverse filament, or a gas discharge tube and a light-emitting diode, or a gas lamp mantle and a laser, is like comparing apples and oranges. We have developed a concept for a common representation of these diverse kinds of light sources, without reference to any coordinate system or light generation process. Based on an expansion in spherical harmonics of an intensity data set over a sphere, we characterize the angular light distribution of a source by providing a prescription for calculating the orientation-independent parameters dl that represent the proportion of rms power distributed in each angular mode.

Paper Details

Date Published: 1 September 1996
PDF: 10 pages
Opt. Eng. 35(9) doi: 10.1117/1.600870
Published in: Optical Engineering Volume 35, Issue 9
Show Author Affiliations
Robert D. Stock, MIT Lincoln Lab. (United States)
Mel Siegel, Carnegie Mellon Univ. (United States)


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