Estimation of thermal diffusivity of thin film materials by a one-level, two-point 'diverging'-thermal-wave technique. Part I: Theory

2003 ◽  
Vol 35/36 (3) ◽  
pp. 265-280 ◽  
Author(s):  
Oleg Troitsky ◽  
Harald Reiss
Keyword(s):  
Thin Film ◽  
Thermal Diffusivity ◽  
Thermal Wave ◽  
Wave Technique

Thermal-diffusivity measurements by the converging-thermal-wave technique

1986 ◽  
Vol 64 (9) ◽  
pp. 1172-1177 ◽  
Author(s):  
P. Cielo ◽  
L. A. Utracki ◽  
M. Lamontagne
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Wave ◽  
Infrared Detector ◽  
Thermal Flux ◽  
Thin Sheet ◽  
High Amplitude ◽  
Practical Implementation ◽  
Noise Sources ◽  
Wave Technique ◽  
Effect Of Surface

A converging-thermal-wave technique is described for the measurement of thermal diffusivity in bulk or thin-sheet materials. An annular-shaped area is heated by a pulsed laser beam focused on the material's surface through a combination of spherical and conical lenses, and the surface temperature is monitored by an infrared detector focused on the center of the annulus. The converging action of the thermal flux results in a high amplitude of the detected signal with little overheating of the irradiated material. An analysis of such a technique is presented, as well as some experimental results obtained on heterogeneous materials. Several aspects relevant to the practical implementation of such a technique in an industrial environment, such as the effect of surface losses and different noise sources, are discussed.

Thermal Properties of Non-Metallic Films by Means of Thermal Wave Techniques

1988 ◽  
Vol 142 ◽  
Author(s):  
H. P. R. Frederikse ◽  
X. T. Ying ◽  
A. Feldman
Keyword(s):  
Thin Film ◽  
Wave Propagation ◽  
Thermal Properties ◽  
Heat Resistance ◽  
Heat Conductivity ◽  
Thermal Wave ◽  
Diamond Films ◽  
Metallic Films ◽  
Oxide Coatings ◽  
Wave Technique

AbstractThe propagation of a thermal wave into a thin film or coating depends on the thermal properties of the material. Consequently, thermal wave generation and detection can be used to obtain the heat conductivity of the material. The method is also useful because thermal wave propagation is sensitive to inhomogeneity, porosity, inclusions, voids, and delaminations. The results of two specific applications of the thermal wave technique are presented, the heat resistance of oxide coatings and of diamond films.

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