Thermal diffusivity measurements on a single fiber with microscale diameter at very high temperature

2006 ◽  
Vol 45 (5) ◽  
pp. 443-451 ◽  
Author(s):  
C. Pradère ◽  
J.M. Goyhénèche ◽  
J.C. Batsale ◽  
S. Dilhaire ◽  
R. Pailler
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Single Fiber ◽  
Diffusivity Measurements ◽  
Very High

scholarly journals Uncertainty Assessment for Very High Temperature Thermal Diffusivity Measurements on Molybdenum, Tungsten and Isotropic Graphite

2021 ◽  
Vol 43 (1) ◽  
Author(s):  
Bruno Hay ◽  
Olivier Beaumont ◽  
Guillaume Failleau ◽  
Nolwenn Fleurence ◽  
Marc Grelard ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Laser Flash ◽  
Uncertainty Assessment ◽  
National Metrology Institute ◽  
Thermal Diffusivity Measurement ◽  
Uncertainty In Measurement ◽  
Diffusivity Measurements ◽  
Very High ◽  
Isotropic Graphite

AbstractThe French National Metrology Institute LNE has improved its homemade laser flash apparatus in order to perform accurate and reliable measurements of thermal diffusivity of homogeneous solid materials at very high temperature. The inductive furnace and the associated infrared (IR) detection systems have been modified and a specific procedure for the in situ calibration of the used radiation thermometers has been developed. This new configuration of the LNE’s diffusivimeter has been then applied for measuring the thermal diffusivity of molybdenum up to 2200 °C, tungsten up to 2400 °C and isotropic graphite up to 3000 °C. Uncertainties associated with these high temperature thermal diffusivity measurements have been assessed for the first time according to the principles of the “Guide to the Expression of Uncertainty in Measurement” (GUM). Detailed uncertainty budgets are here presented in the case of the isotropic graphite for measurements performed at 1000 °C, 2000 °C and 3000 °C. The relative expanded uncertainty (coverage factor k = 2) of the thermal diffusivity measurement is estimated to be between 3 % and 5 % in the whole temperature range for the three investigated refractory materials.

Thermal diffusivity measurement of opaque materials at very high temperature by a modulated technique

1999 ◽  
Vol 31 (5) ◽  
pp. 525-534 ◽  
Author(s):  
Jean-Marc Goyheneche ◽  
Michel Laurent ◽  
Jean-François Sacadura ◽  
Michel Ferri ◽  
Christian Fort
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Thermal Diffusivity Measurement ◽  
Diffusivity Measurement ◽  
Very High

New Apparatus for Thermal Diffusivity and Specific Heat Measurements at Very High Temperature

2006 ◽  
Vol 27 (6) ◽  
pp. 1803-1815 ◽  
Author(s):  
B. Hay ◽  
S. Barré ◽  
J-R. Filtz ◽  
M. Jurion ◽  
D. Rochais ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
New Apparatus ◽  
Very High

Use of LaB6 for a High Quality, Small Energy Spread Beam in an Electron Velocity Spectrometer

1976 ◽  
Vol 34 ◽  
pp. 534-535 ◽  
Author(s):  
P. E. Batson ◽  
C. H. Chen ◽  
J. Silcox
Keyword(s):  
High Temperature ◽  
Energy Resolution ◽  
Electron Velocity ◽  
Electronic Excitations ◽  
Small Energy ◽  
Small Intensity ◽  
Good Energy ◽  
Spectrometer System ◽  
Electron Energy Loss ◽  
Very High

Electron energy loss experiments combined with microscopy have proven to be a valuable tool for the exploration of the structure of electronic excitations in materials. These types of excitations, however, are difficult to measure because of their small intensity. In a usual situation, the filament of the microscope is run at a very high temperature in order to present as much intensity as possible at the specimen. This results in a degradation of the ultimate energy resolution of the instrument due to thermal broadening of the electron beam.We report here observations and measurements on a new LaB filament in a microscope-velocity spectrometer system. We have found that, in general, we may retain a good energy resolution with intensities comparable to or greater than those available with the very high temperature tungsten filament. We have also explored the energy distribution of this filament.

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