Emittance of thin metallic films at cryogenic temperatures
Abstract
The thermal radiation properties (i.e., emittance of absorptance, reflectance, and transmittance) of thin metallic films and metal-coated dielectric films at cryogenic temperatures was investigated. Knowledge of such properties is of major importance due to use of these films in a variety of applications, including multilayer insulations and spacecraft thermal control surfaces. Both theoretical and experimental determinations of the thermal radiation properties of these films are considered. In the theoretical portion of the work, the properties of a single metallic film were obtained through the numerical solution of the governing integrodifferential equation for the anomalous skin effect theory with size effects included. The experimental portion of the work dealt with the design and construction of an experimental apparatus used to determine the radiation emitted by an aluminum film from commercially-available multilayer insulation. The results of the experimental investigation are presented and compared with the results obtained by other researchers.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1976
- Bibcode:
- 1976PhDT.........5F
- Keywords:
-
- Cryogenics;
- Emittance;
- Metal Films;
- Spacecraft Shielding;
- Thermal Control Coatings;
- Thermal Radiation;
- Thin Films;
- Absorptance;
- Aluminum;
- Differential Equations;
- Insulated Structures;
- Numerical Analysis;
- Reflectance;
- Solid-State Physics