G - Physics – 01 – J
Patent
G - Physics
01
J
73/55
G01J 1/00 (2006.01) G01J 3/51 (2006.01)
Patent
CA 1153219
21 49,080 ABSTRACT OF THE DISCLOSURE Method and apparatus for expressing as a number the relative brightness of artificial illumination as it is perceived by the average observer. There is extracted (i.e., detected) from the illumination to be measured, a blue-appearing narrow band, a green-appearing narrow band, a yellow-appearing narrow band and a red-orange-appearing narrow band. From these extracted bands are generated six different signals: a signal expressed as (aB) where (a) is about 0.23 and (B) is the watts of energy in the blue band, a signal expressed as (bG) where (b) is about 0.97 and (G) is the watts of energy in the green band, a signal expressed as (cR) where (c) is about 0.33 and (R) is the watts of energy in the red-orange band, a signal expressed as (dY) where (d) is about 0.19 and (Y) is the watts of energy in the yellow band, a signal expressed as (eG) where (e) is about 0.25 and (G) is the watts of energy in the green band, and a signal expressed as (fR) where (f) is about 0.25 and (R) is the watts of energy in the red- orange band. These signals are combined in the following manner: aB + bG +cR - dY + (the larger of eG and fR minus the smaller of eG and fR). These combined signals are expressed as a number which is indicative of the relative brightness of artificial illumination as perceived by the average observer.
382385
Chen Edward
Morton Edward W.
Rachko Dorothy
Thornton William A.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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