Abstract
Radiometric and photometric quantities rely on a geometric description of the
beam subtended by a source and a receptor. In this paper, a generalization of
this description is proposed as the product of the apparent size of the source
times the receptor angular extent, whatever the natures of these elements:
point, line, surface, or volume. The obtained flux density per geometric extent
expressions are then applied to the determination of the irradiances induced in
the near field and far field by a rectilinear source represented as a point
source, a line source, and a surface source.
© 2013 Optical Society of America
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