Extending the flash method to measure the thermal diffusivity of semitransparent solids

In this work, we extend the classical flash method to retrieve simultaneously the thermal diffusivity and the optical absorption coefficient of semitransparent plates. A complete theoretical model that allows calculating the rear surface temperature rise of the sample has been developed. It takes in...

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Bibliographic Details
Published in:Measurement science & technology 2014-03, Vol.25 (3), p.35604-7
Main Authors: Salazar, Agustín, Mendioroz, Arantza, Apiñaniz, Estibaliz, Pradere, Christophe, Noël, Frédéric, Batsale, Jean-Christophe
Format: Article
Language:English
Subjects:
Absorption coefficient
Calibration
Convection
Convection heating
Engineering Sciences
Heating
Infrared
infrared thermography
Mathematical analysis
photothermal radiometry
Thermal diffusivity
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Summary:In this work, we extend the classical flash method to retrieve simultaneously the thermal diffusivity and the optical absorption coefficient of semitransparent plates. A complete theoretical model that allows calculating the rear surface temperature rise of the sample has been developed. It takes into consideration additional effects such as multiple reflections of the heating light beam inside the sample, heat losses by convection and radiation, transparency of the sample to infrared wavelengths and finite duration of the heating pulse. Measurements performed on calibrated solids, covering a wide range of absorption coefficients from transparent to opaque, validate the proposed method.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/25/3/035604