Über die Grenzen der Lichtmessung mit Silizium-Photoelementen

Abstract

Silicon-photovoltaic cells are now in common use for light- and color-measurement. Their use is limited by the minimum “actinic” radiant flux, which can be measured according to the sensitivity of the detector, lowered by correction to the wanted evaluation function, and the quality of the amplifier. With best operational amplifiers an illuminance of 10-3 lx and a luminance of 2 cd/m2 (evaluation angle 1.5°) can be measured (smallest digit). By tristimulus colorimetry the chromaticity coordinates can be measured with 4 decades, if the sum of the tristimulus values are equivalent to that of 5 lx at illuminant A. © 1975 The Japan Society of Applied Physics.