High-temperature radiators for standards in energy photometry

Abstract

This paper describes the development of new radiators as high-temperature black bodies as basic units providing high meteorological characteristics in the state primary standard for the units of EBSD, RSSD, and EISD, as well as in the state special standard for RS and EI, and in the corresponding working standards, all of which cover a wide spectral range. Various technical specifications are listed which should be satisfied by the emitters in the state standards. On the basis of the physical and technological properties, niobium carbide is found to be the most suitable material for making the emitter for the state primary standard. The black bodies in the state standards in each case consist of two coaxial tubes heated by passing a current and electrically connected in series as shown. The basic dimensions of the KUPVM cavity are given. As the state special standard for EI does not require the highest possible temperatures, the material was chosen to provide the maximum effective emissivity and this material was high-modulus carbonized carbon-plastic KUPVM. A feature of the black bodies for the IR range was that the radiating cavity was heated by a thermal tube.