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6 October 2005 Shaped light guide construction for measurement luminance distribution in the space
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Analysis of luminous flux transfer trough a conical ring-core light guide is presented. This kind of optical guide is used by the authors to build a measuring device which enables to determine the distribution of luminance in the visual space. The angles of acceptance can be selected at random, thus the solid angle, in which the distribution of luminance is analysed, can practically be divided into a chosen number of zones. In the section perpendicular to its axis, the light guide can have an elliptical shape with different angles of acceptance. In such a way it is possible to adjust the division of the space into zones better and create a parallel with two-eye sight (smaller zones in the vertical section, bigger in the horizontal plane). The conical output surface with great vertical angle considerably improves the process of the transfer of the luminous flux trough a conical ring-core light guide. Replacing a flat outlet surface of the light guide by a conical one makes the transferred luminous flux to some extent more uniform.
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Dominik Dorosz, Wladyslaw Dybczynski, and Jan Dorosz "Shaped light guide construction for measurement luminance distribution in the space", Proc. SPIE 5948, Photonics Applications in Industry and Research IV, 594828 (6 October 2005);

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