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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

FLASH DIFFUSIVITY MEASUREMENTS OF HIGHLY CONDUCTIVE THIN SAMPLES : "AN EXPERIMENTAL CHALLENGE"

Get access (open in a dialog) DOI: 10.1615/IHTC11.2940
pages 71-76

Resumo

The purpose of this paper is to present a laser flash technique with fast infrared detection for the measurement of the normal diffusivity of thin samples. In a first part, the apparatus designed for such a measurement is described. Then, experimental results performed within the framework of the Diamond Round Robin 2 tests are presented and difficulties in connection with their good conductivity and low thickness are pointed out.
We especially discuss the specific properties of conductive semi-transparent thin samples like diamond films that can affect the diffusivity measurement technique. Particularly, the radiative transfer within the medium and its interaction with the boundaries are considered. Finally, to explain the defects we observed on several thermograms, a model for highly conductive materials with low optical thickness is purposed.