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Far-field distance for surface light source with different luminous area |
Applied Optics, Vol. 52, Issue 8, pp. 1629-1635 (2013)
http://dx.doi.org/10.1364/AO.52.001629
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Abstract
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
History
Original Manuscript: November 30, 2012
Revised Manuscript: February 2, 2013
Manuscript Accepted: February 4, 2013
Published: March 6, 2013
Citation
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)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-8-1629
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