Open AccessPractical limitations of near-field goniophotometer measurements imposed by a dynamic range mismatch
Author(s) -
Jan Audenaert,
C R Paula Acuña,
Peter Hanselaer,
Frédéric Leloup
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.002240
Subject(s) - optics , luminous intensity , luminous flux , detector , physics , light intensity , photometer , intensity (physics) , dynamic range , high dynamic range , range (aeronautics) , luminance , near and far field , materials science , light source , composite material
Within near-field goniophotometry, measurement results of both an imaging luminance measurement device and a photometer detector are combined to generate the luminous intensity distribution of a light source. The simultaneous use of these two detectors may engender incorrect measurement results, due to their difference in dynamic range. In this paper, near-field and far-field based luminous intensity distribution measurements of two luminaires are presented, in order to exemplify the problem. Results demonstrate that the distributions obtained from near-field measurements may deviate from the correct intensity distribution, by an amount of up to 16% of the total luminous flux of the luminaire. A method to check for the correctness of the luminous intensity distribution from the near-field measurement, the so-called sanity check, is discussed. To conclude, some possible solutions to eliminate the dynamic range mismatch induced errors are treated.