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The Purkinje Effect In Luminance Measurements Of Air Force Phosphors

Report Number: WADC TR 52-282
Author: Pomerantz, Daniel I.
Author: Cannon, John R.
Corporate Author: Materials Laboratory
Laboratory: Materials Laboratory
Date of Publication: 1952-10
Pages: 29
Contract: None Given
Project: None Given
AD Number: AD0005353
Original AD Number: 5353

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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