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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 8 — Mar. 10, 2013
  • pp: 1629–1635

Far-field distance for surface light source with different luminous area

Xianming Liu, Wentao Cai, Xiaohua Lei, Xiaoqing Du, and Weimin Chen  »View Author Affiliations

Applied Optics, Vol. 52, Issue 8, pp. 1629-1635 (2013)

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Most of the lighting designs are based on the far-field characteristics of light sources. It is important to know whether the measurement distance is far enough to simulate the light source as a point source. In this paper, we deduce the far-field conditions for surface light sources with continuous luminous area. The relative far-field distance for several typical flat and curved surface light sources, such as the round, rectangular, annular, hemispherical, and semi-cylindrical sources are calculated. Results show that the classical five times rule is not applicable to surface light sources with hemispherical, arc-shaped semi-cylindrical, and narrow annular luminous areas.

© 2013 Optical Society of America

OCIS Codes
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(120.5240) Instrumentation, measurement, and metrology : Photometry
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(220.4840) Optical design and fabrication : Testing
(150.2945) Machine vision : Illumination design

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: November 30, 2012
Revised Manuscript: February 2, 2013
Manuscript Accepted: February 4, 2013
Published: March 6, 2013

Xianming Liu, Wentao Cai, Xiaohua Lei, Xiaoqing Du, and Weimin Chen, "Far-field distance for surface light source with different luminous area," Appl. Opt. 52, 1629-1635 (2013)

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