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<pubDate xmlns="http://apache.org/cocoon/i18n/2.1">Sun, 12 Apr 2026 20:22:02 GMT</pubDate>
<dc:date>2026-04-12T20:22:02Z</dc:date>
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<title>Measurement of the thermal diffusivity of a silica fiber bundle using a laser and an IR camera</title>
<link>http://hdl.handle.net/10985/10064</link>
<description>Measurement of the thermal diffusivity of a silica fiber bundle using a laser and an IR camera
VIGNOLES, Gérard; BRESSON, Grégory; LORRETTE, Christophe; AHMADI-SENICHAULT, Azita
We propose a lightweight method for the determination of heat diffusivity of silica fiber bundles based on the use of a laser and an IR camera. The fiber bundle is maintained in traction in a holder; exposition is made as a step function, followed by a laser shutdown. The movie obtained by the IR camera is then processed : frame averaging, backgraound computation and substraction, image smoothing, extraction of the IR signal along the fiber bundle. A 1D model has been developed. This problem admits an analytic solution that we have obtained through the use of Laplace transforms. Several identification methods are proposed and tested, and have been compared favorably with an existing method based on periodic heating. Results are in agreement with literature values.
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<pubDate>Sun, 01 Jan 2012 00:00:00 GMT</pubDate>
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<dc:date>2012-01-01T00:00:00Z</dc:date>
<dc:creator>VIGNOLES, Gérard</dc:creator>
<dc:creator>BRESSON, Grégory</dc:creator>
<dc:creator>LORRETTE, Christophe</dc:creator>
<dc:creator>AHMADI-SENICHAULT, Azita</dc:creator>
<dc:description>We propose a lightweight method for the determination of heat diffusivity of silica fiber bundles based on the use of a laser and an IR camera. The fiber bundle is maintained in traction in a holder; exposition is made as a step function, followed by a laser shutdown. The movie obtained by the IR camera is then processed : frame averaging, backgraound computation and substraction, image smoothing, extraction of the IR signal along the fiber bundle. A 1D model has been developed. This problem admits an analytic solution that we have obtained through the use of Laplace transforms. Several identification methods are proposed and tested, and have been compared favorably with an existing method based on periodic heating. Results are in agreement with literature values.</dc:description>
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<title>Estimation de la diffusivité thermique de composites C/SiC sous chargement mécanique</title>
<link>http://hdl.handle.net/10985/6613</link>
<description>Estimation de la diffusivité thermique de composites C/SiC sous chargement mécanique
LORRETTE, Christophe; EL YAGOUBI, Jalal; COUPE, Aurélie; CATY, Olivier; SAUDER, Cédric; BATSALE, Jean-Christophe
L'accès aux propriétés thermiques des matériaux composites thermostructuraux destinés aux applications nucléaires est un enjeu important pour prévoir leur comportement en condition d'utilisation. Dans un objectif prévisionnel mais également de compréhension des transferts de chaleur, ce travail s'intéresse à l'évaluation des diffusivités thermiques transverses de composites Cf/SiC soumis à un chargement mécanique de type traction. La démarche mise en place s'appuie sur l'utilisation de la méthode flash associée à une analyse du signal par thermographie IR permettant de générer des cartographies de propriétés.
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<pubDate>Sun, 01 Jan 2012 00:00:00 GMT</pubDate>
<guid isPermaLink="false">http://hdl.handle.net/10985/6613</guid>
<dc:date>2012-01-01T00:00:00Z</dc:date>
<dc:creator>LORRETTE, Christophe</dc:creator>
<dc:creator>EL YAGOUBI, Jalal</dc:creator>
<dc:creator>COUPE, Aurélie</dc:creator>
<dc:creator>CATY, Olivier</dc:creator>
<dc:creator>SAUDER, Cédric</dc:creator>
<dc:creator>BATSALE, Jean-Christophe</dc:creator>
<dc:description>L'accès aux propriétés thermiques des matériaux composites thermostructuraux destinés aux applications nucléaires est un enjeu important pour prévoir leur comportement en condition d'utilisation. Dans un objectif prévisionnel mais également de compréhension des transferts de chaleur, ce travail s'intéresse à l'évaluation des diffusivités thermiques transverses de composites Cf/SiC soumis à un chargement mécanique de type traction. La démarche mise en place s'appuie sur l'utilisation de la méthode flash associée à une analyse du signal par thermographie IR permettant de générer des cartographies de propriétés.</dc:description>
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