Thermal measuring and testing – Differential thermal analysis – Detail of sample holder or support therefor
Patent
1980-11-03
1982-09-21
Goldstein, Herbert
Thermal measuring and testing
Differential thermal analysis
Detail of sample holder or support therefor
G01K 1700
Patent
active
043504469
ABSTRACT:
A calorimetric differential thermal analyzer uses a planar thermoelectric sheet as its major heat flow path for transferring heat from a heat source to both the reference and sample positions. The heat source is connected to each of the positions by equivalent thermal paths formed by the sheet itself. These paths to each test position are made thermally equivalent by making them geometrically similar and forming isothermal boundaries on the sheet itself between each of the test positions. These isothermal boundaries are connected to the heat source and formed of a material having a high thermal conductance.
The thermal equivalency of the paths may be enhanced by removing portions of the sheetlike material to form well defined patterns of heat flow in the sheet; e.g., structures in which the sheet is formed into radial arms in a wheel-like array with each test position being on a different spoke of the wheel. Heat from the heat source may be applied through the hub of the wheel or the rim of the wheel or both, the hub and rim being in good thermal contact with isothermal boundaries having a high thermal conductance.
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E. I. Du Pont de Nemours and Company
Goldstein Herbert
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