Abstract

An equation is derived which relates the effective emittance of a cylindrical cavity to the emittance of the construction material, the ratio of the length to the radius of the cylinder, and the distance separating the cylinder and the receiver. This equation was checked by measuring the effective emittance of shallow cylinders of two different lengths, at four axial distances, and with three filter systems. The use of filters in combination with a construction material whose spectral emittance varies sharply is equivalent to varying the emittance of the construction material. In all cases considered, the experimental result and the value predicted are in agreement within the experimental limits.

© 1957 Optical Society of America

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Equations (13)

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