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Applied Optics

Applied Optics


  • Vol. 22, Iss. 21 — Nov. 1, 1983
  • pp: 3457–3464

Incident photometry: specifying stimuli for vision and light detectors

Thorny H. Nilsson  »View Author Affiliations

Applied Optics, Vol. 22, Issue 21, pp. 3457-3464 (1983)

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Photometry has traditionally been conceptualized primarily in terms of measuring light sources. However, all units of photometry can also refer to measurements of light as it is received. A description of how to measure incident light is developed from the basis that light forming an image is just the reverse of light emitted from a source. The incident approach to photometry reveals how to derive luminance from a measure of illuminance and how to correctly calculate the illumination of an image. It is further recommended that photometric specification of incident light be accompanied by a description of its effectiveness relative to the receiver threshold.

© 1983 Optical Society of America

Original Manuscript: November 6, 1982
Published: November 1, 1983

Thorny H. Nilsson, "Incident photometry: specifying stimuli for vision and light detectors," Appl. Opt. 22, 3457-3464 (1983)

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  31. This assumes the source is at infinity and neglects taking into account the projected spherical area of the lens, which for most lenses amounts to a trivial correction.

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