Signal generation mechanisms, intracavity-gas thermal-diffusivity temperature dependence, and absolute infrared emissivity measurements in a thermal-wave resonant cavity

1998 ◽  
Vol 69 (1) ◽  
pp. 197-203 ◽  
Author(s):  
Jun Shen ◽  
Andreas Mandelis ◽  
Helen Tsai
Keyword(s):  
Thermal Diffusivity ◽  
Temperature Dependence ◽  
Thermal Wave ◽  
Resonant Cavity ◽  
Signal Generation ◽  
Infrared Emissivity ◽  
Generation Mechanisms ◽  
Emissivity Measurements

scholarly journals Thermal infrared emissivity measurements under a simulated lunar environment: Application to the Diviner Lunar Radiometer Experiment

2012 ◽  
Vol 117 (E12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Kerri L. Donaldson Hanna ◽  
Michael B. Wyatt ◽  
Ian R. Thomas ◽  
Neil E. Bowles ◽  
Benjamin T. Greenhagen ◽  
...  
Keyword(s):  
Thermal Infrared ◽  
Infrared Emissivity ◽  
Lunar Environment ◽  
Emissivity Measurements

Optical device for thermal diffusivity determination in liquids by reflection of a thermal wave

2017 ◽  
Vol 88 (8) ◽  
pp. 084901
Author(s):  
C. Sánchez-Pérez ◽  
A. De León-Hernández ◽  
C. García-Cadena
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Wave ◽  
Optical Device

scholarly journals THERMAL DIFFUSIVITY MEASUREMENT OF SOLID USING PYROELECTRIC SENSOR

2017 ◽  
Vol 19 (1) ◽  
pp. 91-95
Author(s):  
B. Z. Azmi ◽  
Y. T. Ling ◽  
M. Hashim ◽  
W. M. M. Yunus ◽  
M. M. Moksin
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Wave ◽  
Spectroscopic Technique ◽  
Thermal Diffusivity Measurement ◽  
Pyroelectric Sensor ◽  
Diffusivity Measurement ◽  
Sensor Position ◽  
Aluminium Copper ◽  
Lateral Distance ◽  
Good Agreement

The recently developed pyroelectric spectroscopic technique has been used to measure the thermal diffusivity of solids. The method has been applied to conductors and insulator where by the thermal wave is measured at various lateral distances on the sample between laser illuminated line and pyroelectric sensor position. The thermal diffusivity is obtained from the gradient of the plot of thermal wave signal versus the lateral distance. A good agreement to the previously reported thermal diffusivity value has been obtained for aluminium, copper and spray paint that is 0.809 cm2s-1, 1.128 3cm2s-1 and 1.547 x 10-3 cm2s-1 respectively.

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.

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