Orientation invariant light source parameters

Robert D. Stock; Mel Siegel

doi:10.1117/1.600870

1 September 1996 Orientation invariant light source parameters

Robert D. Stock, Mel Siegel

Optical Engineering, Vol. 35, Issue 9, (September 1996). https://doi.org/10.1117/1.600870

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.

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Robert D. Stock and Mel Siegel "Orientation invariant light source parameters," Optical Engineering 35(9), (1 September 1996). https://doi.org/10.1117/1.600870

Published: 1 September 1996

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