Powell W R
Appl Opt. 1974 Mar 1;13(3):593-4. doi: 10.1364/AO.13.000593.
The fractional deviation from blackbody radiation due to wall emissivity modestly differing from unity and due to the presence of a temperature gradient (dT/dx) at the open end of a specularly reflecting semi-infinite cylinder of diameter D and end temperature T(1) is shown to be [Equation].
对于直径为D且端部温度为T(1)的镜面反射半无限长圆柱体，由于壁发射率略不同于1以及在开口端存在温度梯度(dT/dx)而导致的与黑体辐射的分数偏差如[方程式]所示。
