黑体筒封闭法测定比辐射率的方法大大简化了比辐射率的测量及计算过程; 针对这种方法,分析了目标物体、环境的出射辐照度的波动对比辐射率精确测定的影响,讨论了不同辐射计滤光波段对计算的影响;并根据大量的实验给出冷热环境温差的优化值。最后给出了对比辐射率精确测定具有指导意义的3 个结论。

The Sealing Cavity method for determining the emissivity of the target object simplified the measuring and computing process. According to above mentioned method, in this paper, the influence on the accurately measuring result of the undulation of target object emittance and environment emittance have been analyzed. Also, we discuss the effect of wavebands between different infrared radiometers. Through lots of experiments, the optimum contrast temperature difference between hot environment and cool environment is given. Finally, three conclusions are drawn to guide the measurement of emissivity.