1 January 1991 Design and analysis of illumination systems
Author Affiliations +
Proceedings Volume 1354, 1990 Intl Lens Design Conf; (1991) https://doi.org/10.1117/12.47889
Event: 1990 International Lens Design Conference, 1990, Monterey, CA, United States
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
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Guenter Zoechling, Guenter Zoechling, } "Design and analysis of illumination systems", Proc. SPIE 1354, 1990 Intl Lens Design Conf, (1 January 1991); doi: 10.1117/12.47889; https://doi.org/10.1117/12.47889


Back to Top