A Mess Of Cavity Emissivities

Frederick O. Bartell

doi:10.1117/12.960748

20 September 1989 A Mess Of Cavity Emissivities

Frederick O. Bartell

Proceedings Volume 1110, Imaging Infrared: Scene Simulation, Modeling, and Real Image Tracking; (1989) https://doi.org/10.1117/12.960748
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

Three types of cavity emissivities are described based on wavelength, two types based on temperature, and five types based on geometry. Nonisothermal cavities are shown to be best represented by a two-temperature emissivity while most other items, including isothermal cavities, are customarily represented by a one-temperature emissivity. Radiance based emissivity and local hemispherical emissivity are recommended for making cavity evaluations and comparisons, while the hemispherical emissivity of the cavity aperture and a cavity emissivity that is based on detector considerations are shown to be faulty.

Citation Download Citation

Frederick O. Bartell "A Mess Of Cavity Emissivities", Proc. SPIE 1110, Imaging Infrared: Scene Simulation, Modeling, and Real Image Tracking, (20 September 1989); https://doi.org/10.1117/12.960748

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