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Data of a glass filter combination converting the spectral responsivity of the GaP photoelement to the window-function cutting off the UV-A band and a probe structure realizing the cosine character directional response are given. Systems for measuring the spectral characteristics of the photoelement and the filters, and for measuring the directional characteristic of the probe, as well as the software that optimizes the thicknesses of the filters for reaching the minimal integral error are touched on.
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