VNIIOFI participates in the Consultative Committee for Thermometry working group 5 "Radiation Thermometry" (CCT-WG5) international project on investigation of high temperature fixed points (HTFPs) [1]. Piloted by the National Physical Laboratory Workpackage 5 (EMRP Project: SIB01 InK Workpackage 1) of the project [2] is dedicated to the measurements that will result in definitive thermodynamic temperatures being assigned to a set of high temperature fixed points of Co-C, Pt-C and Re-C. For determining the HTFPs thermodynamic temperatures a radiance-mode radiation thermometer is used. The thermometer is calibrated against an irradiance-mode filter radiometer (FR) with known spectral irradiance responsivity via a variable-high temperature blackbody. This paper is devoted to VNIIOFI's measurements of spectral irradiance responsivity of the FR.
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