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Optical measurement of thermal conductivity using fiber aligned frequency domain thermoreflectance / Jonathan A. Malen in Journal of heat transfer, Vol. 133 N° 8 (Août 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 8 (Août 2011) . - pp. [081601/1-7] Titre : Optical measurement of thermal conductivity using fiber aligned frequency domain thermoreflectance Type de document : texte imprimé Auteurs : Jonathan A. Malen, Auteur ; Kanhayalal Baheti, Auteur ; Tao Tong, Auteur Année de publication : 2011 Article en page(s) : pp. [081601/1-7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Thermal  conductivity  Thermal  diffusivity  Thermometry  Photothermal  Thermoreflectance  Frequency  Domaines Index. décimale : 536 Chaleur. Thermodynamique Résumé : Fiber aligned frequency domain thermoreflectance (FAFDTR) is a simple noncontact optical technique for accurately measuring the thermal conductivity of thin films and bulk samples for a wide range of materials, including electrically conducting samples. FAFDTR is a single-sided measurement that requires minimal sample preparation and no microfabrication. Like existing thermoreflectance techniques, a modulated pump laser heats the sample surface, and a probe laser monitors the resultant thermal wave via the temperature dependent reflectance of the surface. Via the use of inexpensive fiber coupled diode lasers and common mode rejection, FAFDTR addresses three challenges of existing optical methods: complexity in setup, uncertainty in pump-probe alignment, and noise in the probe laser. FAFDTR was validated for thermal conductivities spanning three orders of magnitude (0.1–100 W/m K), and thin film thermal conductances greater than 10 W/m2 K. Uncertainties of 10–15% were typical, and were dominated by uncertainties in the laser spot size. A parametric study of sensitivity for thin film samples shows that high thermal conductivity contrast between film and substrate is essential for making accurate measurements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...] [article] Optical measurement of thermal conductivity using fiber aligned frequency domain thermoreflectance [texte imprimé] / Jonathan A. Malen, Auteur ; Kanhayalal Baheti, Auteur ; Tao Tong, Auteur . - 2011 . - pp. [081601/1-7]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 8 (Août 2011) . - pp. [081601/1-7] Mots-clés : Thermal  conductivity  Thermal  diffusivity  Thermometry  Photothermal  Thermoreflectance  Frequency  Domaines Index. décimale : 536 Chaleur. Thermodynamique Résumé : Fiber aligned frequency domain thermoreflectance (FAFDTR) is a simple noncontact optical technique for accurately measuring the thermal conductivity of thin films and bulk samples for a wide range of materials, including electrically conducting samples. FAFDTR is a single-sided measurement that requires minimal sample preparation and no microfabrication. Like existing thermoreflectance techniques, a modulated pump laser heats the sample surface, and a probe laser monitors the resultant thermal wave via the temperature dependent reflectance of the surface. Via the use of inexpensive fiber coupled diode lasers and common mode rejection, FAFDTR addresses three challenges of existing optical methods: complexity in setup, uncertainty in pump-probe alignment, and noise in the probe laser. FAFDTR was validated for thermal conductivities spanning three orders of magnitude (0.1–100 W/m K), and thin film thermal conductances greater than 10 W/m2 K. Uncertainties of 10–15% were typical, and were dominated by uncertainties in the laser spot size. A parametric study of sensitivity for thin film samples shows that high thermal conductivity contrast between film and substrate is essential for making accurate measurements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013300 [...]