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Proceedings Paper

Design and analysis of illumination systems
Author(s): Guenter Zoechling
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Paper Abstract

Illuminance at a detector is calculated by means of raytracing. A method of synthesis already known from related fields - is demonstrated: the Edge Ray Principle. 1. 1 Concepts of photometry 1. ANALYSIS We have to recall the basic physical concepts of photometry namely luminance light intensity light flux and illuminance [21 The definition of a Lambertian Source is given here again due to its fundamental importance: we call a radiating surface a Lambertian Source its luminance is independent of surface coordinates and viewing angle. An equivalent formulation is: the source obeys ''Lamberts cosine law of intensity'' for any surface element dA and any angle B dl L * cos B * dA (1) L luminance dA surface element at source I intensity B angle between surface normal and viewing direction The Lambertian Source has several interesting attributes for instance that we cannot judge its position or shape by just looking at it. A more precise formulation of this phenomenon can be stated as following: 1. 2 Pseudo luminance of the hole Let D be some area on a detector H be a hole in an opaque screen (both not necessarily small) and Si and S2 be lambertian radiating surfaces (alternatively existing) then the following theorem holds: SPIE Vol. 1354 International Lens Design Conference (1990) / 617 y D (p y H (p Fig. i

Paper Details

Date Published: 1 January 1991
PDF: 10 pages
Proc. SPIE 1354, 1990 Intl Lens Design Conf, (1 January 1991); doi: 10.1117/12.47889
Show Author Affiliations
Guenter Zoechling, DOCTER Prazisionsoptik Wien (Austria)

Published in SPIE Proceedings Vol. 1354:
1990 Intl Lens Design Conf
George N. Lawrence, Editor(s)

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