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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 25 — Dec. 6, 2010
  • pp: 26293–26299

Photometry in the dark: time dependent visibility of low intensity light sources

Dirk Poelman and Philippe F. Smet  »View Author Affiliations

Optics Express, Vol. 18, Issue 25, pp. 26293-26299 (2010)

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This paper aims at describing the perceived brightness of persistent luminescent materials for emergency signage. In case of emergency, typically, a fully light adapted person is left in the dark, except for the emergency sign. The available photometric models cannot describe visibility of such light source, as they do not consider the slow dark adaptation of the human eye. The model proposed here fully takes into account the shift from photopic to scotopic vision, the related shift in spectral sensitivity and the dark adaptation. The resulting metric is a ‘visibility index’ and preliminary tests show that it more realistically describes the perceived brightness of persistent luminescent materials than the common photometric standards.

© 2010 Optical Society of America

OCIS Codes
(120.5240) Instrumentation, measurement, and metrology : Photometry
(160.2540) Materials : Fluorescent and luminescent materials
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(330.4060) Vision, color, and visual optics : Vision modeling

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: September 21, 2010
Revised Manuscript: October 27, 2010
Manuscript Accepted: November 26, 2010
Published: December 1, 2010

Dirk Poelman and Philippe F. Smet, "Photometry in the dark: time dependent visibility of low intensity light sources," Opt. Express 18, 26293-26299 (2010)

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