A method to calculate the directional local effective emissivity for a cavity having non-Lambertian isothermal surfaces is presented. Numerical calculation is carried out for a cylindrocone. The directional local effective emissivity directed to the cavity bottom is smaller than that directed to the cavity opening, and the local effective emissivity for a Lambertian takes a value close to the middle. The integrated effective emissivities are computed for a nonimaging system and an imaging optical system.
© 1999 Optical Society of America
(080.2720) Geometric optics : Mathematical methods (general)
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.5700) Instrumentation, measurement, and metrology : Reflection
(120.6780) Instrumentation, measurement, and metrology : Temperature
Y. Ohwada, "Calculation of the effective emissivity of a cavity having non-Lambertian isothermal surfaces," J. Opt. Soc. Am. A 16, 1059-1065 (1999)