Accession Number : AD0833528

Title :   HIGH TEMPERATURE SPECTRAL IRRADIANCE (350 TO 750 MILLIMICRONS) OF POROUS REFRACTORIES.

Descriptive Note : Final rept. Dec 66-Oct 67,

Corporate Author : MARTIN MARIETTA AEROSPACE ORLANDO FL

Personal Author(s) : Woodward, R. S. ; Durand, J. L.

Report Date : NOV 1967

Pagination or Media Count : 176

Abstract : The spectral irradiances (350 to 750 millimicrons) of gas-fired thoria mantles containing small percentages of various rare earth oxides were experimentally determined. The data obtained were compared with irradiance values for standard Welsbach mantles (99.3 percent thoria and 0.3 percent ceria) and pure thoria mantles under identical conditions. It was found that additions of rare earths oxides to thoria, other than ceria, reduced the light output of pure thoria, with the exception of terbia, under the conditions investigated. Based upon the experimental work, it is recommended that the systems hafnia-ceria, hafnia-terbia, and thoria-terbia be investigated. Spectral emissivities, in the visible spectrum, of refractory materials have been compiled from a literature survey, and an annotated bibliography of mantle research is also included. (Author)

Descriptors :   (*NIGHT WARFARE, ILLUMINATION), (*REFRACTORY MATERIALS, LUMINESCENCE), POROUS MATERIALS, HIGH TEMPERATURE, THORIUM COMPOUNDS, RARE EARTH COMPOUNDS, OXIDES, EMISSIVITY, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA.

Subject Categories : Ceramics, Refractories and Glass
      Military Operations, Strategy and Tactics
      Optical Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE