Analysis And Experimental Evaluation Of An Ultra-High Temperature Pyrolytic Graphite Thermocouple

Item

Title
Analysis And Experimental Evaluation Of An Ultra-High Temperature Pyrolytic Graphite Thermocouple
Date
1966
Index Abstract
Coming Soon
Photo Quality
Not Needed
Report Number
AFFDL TR 66-27
Creator
Klein, C. A.
Lepie, M. P.
Donadio, R. N.
Corporate Author
Raytheon Co Waltham Ma Research Div
Laboratory
Air Force Flight Dynamics Laboratory
Extent
40
Identifier
AD0802214
Access Rights
Export Controls
Distribution Classification
1
Contract
AF 33(615)-2650
DoD Project
1469
DoD Task
146907
DTIC Record Exists
No
Distribution Change Authority Correspondence
AFFDC LTR
Abstract
This report is made up of three segments as follows: (1) A theoretical analysis of thermoelectricity along graphite layer planes. It is shown how the TEP can be derived from first principles using the Slonczewski-Weiss description of the graphite band structure. From the density of state equation we derive rigorous indications on the energy dependence of the scattering parameter, which allow us to undertake valid comparisons with experimental results. (2) Chapter II summarizes the experimental procedure. Great care was taken in order to arrive at reliable Seebeck coefficients. Thermocouple work was plagued by experimental difficulties (furnace conductance) of a similar nature as experienced by other investigators. (3) Finally, measured TEP was assessed in the light of the theory developed in Chapter I. New light is thus shed upon critical parameters such as the mobility ratio, which leads to a much improved description of transport in pyrolytic graphite and alloys of pyrolytic graphite. It is demonstrated that BPG/PG thermocouples are intrinsically capable of delivering exceptionally favorable output characteristics; a reduction to practice will require further efforts, in particular in connection with proper test-furnace design.
Report Availability
Full text available
Date Issued
1966-06
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Media
AFFDLTR66-027.pdf