What light tubes are good for: connecting theories

Henning Rehn; Julius Muschaweck

doi:10.1117/12.2631710

3 October 2022 What light tubes are good for: connecting theories

Henning Rehn, Julius Muschaweck

Proceedings Volume 12220, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XVIII; 1222002 (2022) https://doi.org/10.1117/12.2631710
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

A Light Tube is a geometric arrangement of two areas with their center points separated by a certain distance. These can be of equal or different size; they can be oriented perpendicularly to the center line (i.e. face each other) or can be tilted. There are no physical tube walls, only geometry. Important cases are light tubes formed by object and entrance pupil or source and target areas. Light tubes showed up in various aspects of imaging and nonimaging optics, e.g. K¨ohler’s illumination principle, Hottel’s formula in thermal radiation, Zimmer’s Geometrical Optics, and Ploke’s “Lichtf¨uhrungseinrichtungen” (light guides). Besides presenting such examples, we elaborate on optical design around light tubes: we investigate whether and how imaging or non-imaging systems can connect two equal ´etendue light tubes, and we discuss how optics within a light tube (between a given source and target areas) can maximize collection efficiency.

Citation Download Citation

Henning Rehn and Julius Muschaweck "What light tubes are good for: connecting theories", Proc. SPIE 12220, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XVIII, 1222002 (3 October 2022); https://doi.org/10.1117/12.2631710

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