Temperature uniformity optimum design and performance evaluation of surface blackbody radiant source with cavity effect

Abstract:

To satisfy the high requirement of temperature uniformity of concentric V-grooved surface blackbody, an optimum design method based on finite element method and with axial, radial temperature uniformity and effective emissivity as constraints is proposed. Firstly, the kinds, causes and variations of temperature nonuniformity are analyzed; Secondly, the interactional relationship between temperature nonuniformity and effective emissivity is researched; Thirdly, the optimum design parameters of concentric V-grooved surface blackbody are determined based on complex constraints, and the surface blackbody is developed based on optimum parameters; Finally, the temperature uniformity of surface blackbody is tested and evaluated. The results demonstrate that the temperature uniformity can reach 0.1 K in the range from 250 K to 350 K. The structural parameters reasonable design of radiation surface and soaking disk is the key factor of ensuring temperature uniformity.