Total Normal And Total Hemispherical Emittance Of Polished Metals - Part II

Item

Title
Total Normal And Total Hemispherical Emittance Of Polished Metals - Part II
Date
1963
Index Abstract
Contrails only
Photo Quality
Incomplete
Report Number
WADD TR 61-94 Part 2
Creator
Abbott, G. L.
Alvares, N. J.
Parker, W. J.
Corporate Author
Naval Radiological Defense Laboratory
Laboratory
Directorate of Materials and Processes
Extent
31
Identifier
AD0297865
AD0297865
Access Rights
OTS
Distribution Classification
1
Contract
AF 33(616)-617
DoD Project
7360
DoD Task
736001
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Report Availability
Full text available by request
Date Issued
1963-01
Abstract
The total hemispherical emittance, the total normal emittance, the spectral emittance at 0.65 microns and the electrical resistivity were measured on freshly rolled and polished surfaces of molybdenum in a vacuum over a temperature range from 1100°K to 1800°K. The total hemispherical emittance was obtained from the measured power dissipation at the center of an electrically heated strip suspended in a vacuum while its temperature was measured using a themocouple. The total normal emittance was measured using a radiation thermopile. The ratio of total hemispherical to total normal emittance was also calculated directly from the angular distribution of radiation obtained by revolving the detector about an axis through the ribbon.

Observations were also made on the time variation of the total hemispherical emittance of platinum. Small increases were noted in the emittance while thermal etching of the boundaries between the crystals was followed by time lapse photomicroscopy of the heated surface.
Subject
Electrical Resistance
Emissivity
Emittance
Hemispheres
Molybdenum
Platinum
Radiation Measuring Instruments
Publisher
Wright-Patterson Air Force Base, OH : Directorate of Materials and Processes, Aeronautical Systems Division, Air Force Systems Command
Distribution Conflict
No
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Format
31 pages ; 28 cm.

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