Sparrow E M, Kruger P D, Heinisch R P
Appl Opt. 1973 Oct 1;12(10):2466-71. doi: 10.1364/AO.12.002466.
Analytical results are presented for radiation interchange in cavities having nonisothermal walls in order to implement experimental methods for determining the emittance of solids. The cavity may be visualized as a hole that is machined into the exposed face of a solid whose emittance is to be determined, with the solid being heated uniformly from behind. The results were obtained by solving the coupled problems of radiant transport in the cavity and two-dimensional heat conduction in the solid that bounds the cavity. From the solutions, results for the radiant flux leaving the base surface of the cavity are presented as a function of the emittance, of the depth-radius ratio of the cavity, and of a temperature gradient parameter. This information can be used in conjunction with measurements of the radiances of the base surface and the exposed face of the solid to determine the emittance. A method is also described for simultaneously determining both the emittance of the material and the temperature of the exposed face.
为了实施测定固体发射率的实验方法，给出了具有非等温壁面的腔体中辐射交换的分析结果。该腔体可视为一个加工在待测定发射率固体暴露面上的孔，固体从后面均匀加热。结果是通过求解腔体中辐射传输与界定腔体的固体中的二维热传导的耦合问题而获得的。从这些解中，给出了离开腔体底面的辐射通量随发射率、腔体深度半径比以及温度梯度参数的函数关系。此信息可与固体底面和暴露面的辐射亮度测量结果结合使用，以确定发射率。还描述了一种同时测定材料发射率和暴露面温度的方法。
