VARIATION OF H2O AND CO2 CRYODEPOSIT REFLECTANCES WITH ANGLE OF INCIDENCE AND DEPOSIT THICKNESS
Abstract
Cryodeposits which form on the cryogenically cooled walls of a space simulation chamber can change the wall reflectance and thus alter the thermal balance of the test vehicle. In the study, H2O and CO2 cryodeposits of thicknesses up to 1.8 mm were formed on a 77K surface under vacuum. The spectral reflectances of these deposits were measured in situ with an integrating sphere for angles of incidence from 0 to 60 deg. At the smaller deposit thicknesses, the reflectance showed a strong dependence on both thickness and angle of incidence, whereas at larger thicknesses the dependence was less. A theoretical model developed for reflectance determination of absorbing and scattering media gives a good representation of the thickness dependence of water cryodeposit reflectance except at very small thicknesses where interference effects are known to occur.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1968
- Accession Number
- AD0674742
Entities
People
- A. Matthew Smith
- B. A. Seiber
- Bobby E. Wood
Organizations
- Arnold Engineering Development Complex