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Title
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The Purkinje Effect In Luminance Measurements Of Air Force Phosphors
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Date
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1952
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Index Abstract
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Coming Soon
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Photo Quality
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Complete
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Report Number
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WADC TR 52-282
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Creator
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Pomerantz, Daniel I.
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Cannon, John R.
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Corporate Author
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Materials Laboratory
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Laboratory
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Materials Laboratory
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Extent
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29
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NTRL Accession Number
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AD005353
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Identifier
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AD0005353
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AD Number
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5353
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Access Rights
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Notice(s)
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Distribution Classification
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1
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Contract
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None Given
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DoD Project
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None Given
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DoD Task
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None Given
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DTIC Record Exists
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Yes
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Distribution Change Authority Correspondence
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AFAL ltr
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Distribution Change Action Date
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9/16/2002
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Abstract
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A formula is derived for relating effective and photopic units of luminance by means of Weaver's interpolated data (J. Opt. Soc. Amer. 39:281, 1949) for the mesopic luminosity functions. The formula is applied to the spectra of 4 typical AF luminescent phosphors; results are compared with experimental data. Individual values of B'/B reveal considerable dispersion around the mean value, particularly as the match becomes more heterochromatic; B' is the specified luminance measured in effective units of luminance, and B is the luminance of the same area in photopic lamberts. Averaged values agree with the B'/B curves. Weaver's data is tentatively accepted for conversion between effective and photopic units in luminance measurements of luminescent materials. A study of the effect of color on the results of the Purkinje effect showed that colors furthest removed from that of the standard 2360 deg K source exhibited the most pronounced change in B'/B with decreasing luminance. The blue phosphor produced over 4 times as much visual response per unit energy at the lowest luminances than at luminances above 1 ft-lambert; the red phosphor produced about 1/5 the amount.
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Report Availability
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Full text available
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Date Issued
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1952-10
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Provenance
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IIT
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Type
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report
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Format
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1 online resource
WADCTR52-282.pdf