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
Instrumentation, Measurement, and Metrology
Original Manuscript: October 22, 2012
Revised Manuscript: January 16, 2013
Manuscript Accepted: January 21, 2013
Published: March 6, 2013
Lionel Simonot and Pierre Boulenguez, "Generalization of the geometric description of a light beam in radiometry and photometry," J. Opt. Soc. Am. A 30, 589-595 (2013)