The Purkinje Effect In Luminance Measurements Of Air Force Phosphors

Item

Title
The Purkinje Effect In Luminance Measurements Of Air Force Phosphors
Date
1952
Index Abstract
Coming Soon
Photo Quality
Complete
Report Number
WADC TR 52-282
Creator
Pomerantz, Daniel I.
Cannon, John R.
Corporate Author
Materials Laboratory
Laboratory
Materials Laboratory
Extent
29
NTRL Accession Number
AD005353
Identifier
AD0005353
AD Number
5353
Access Rights
Notice(s)
Distribution Classification
1
Contract
None Given
DoD Project
None Given
DoD Task
None Given
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
AFAL ltr
Distribution Change Action Date
9/16/2002
Abstract
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.
Report Availability
Full text available
Date Issued
1952-10
Provenance
IIT
Type
report
Format
1 online resource
Media
WADCTR52-282.pdf

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