539 Moderne Physik
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Specially designed Re-C, TiC-C and ZrC-C fixed-point cells for irradiance measurements have been produced by VNIIOFI. In several investigations at VNIIOFI and PTB the usability of the design for irradiance measurements has been demonstrated. Current developments of furnace uniformity demonstrate further improvements to the systems.
In the first part of this paper we give a brief survey of the approaches taken to achieve these rather challenging goals. Then we will focus on some aspects of transfer detector standards that have to be taken into account if the highest possible accuracy is to be reached. The final section of the paper deals with a new and very promising method for the dissemination of the spectral responsivity of semiconductor photodiodes.
