Contribution à la mesure de température des matériaux sous choc modéré par pyrométrie optique

Abstract : This work investigates the temperature measurement under shock-wave compression at the interface between a material target (lead or copper) and a LiF window at pressure and temperature values at about 8 GPa and below 550 K during a microsecond. Among the common diagnostic to determine temperature, infrared optical pyrometry is the most effective. To obtain an accurate measurement of the true interface temperature and therefore the true material temperature, the emissivity of the surface must be evaluated and the interface between the studied material and the window must be analysed. The use of an emissive layer at the interface is the selected solution to perform accurate temperature measurement. Nevertheless, the complexity of this interface needs to identify the origin of the detected thermal radiance and to analyze heat transfer phenomena in thin layers. The comparison between experimental results and theoretical predictions bring out that only thermal conduction allows thermal energy exchanges between the material, the emissive layer, the glue and the window. So, the emissive layer must have an excellent thermal conductivity and must be very thin while guarantying opacity and emissivity close to unity. The use of an emissive ReSi2 layer gives promising results. Conversely, the emissive paint is inappropriate to play the role of an emissive layer: its thickness is too important and its opacity is not achieved.
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Submitted on : Friday, April 30, 2010 - 2:06:50 PM
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  • HAL Id : tel-00477899, version 1



Camille Chauvin. Contribution à la mesure de température des matériaux sous choc modéré par pyrométrie optique. Sciences de l'ingénieur [physics]. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2010. Français. ⟨tel-00477899⟩



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