Ångström's method has been used to quantify thermal diffusivity of materials for over 150 years via measurement of thermal waves propagating through a long, thin sample. However, the traditional Ångström's method has some limitations. First, the traditional method is insensitive to potential variability in thermal diffusivity along the length of a sample because only two sensors are used. Second, conventional contact-based sensing techniques such as thermocouples limit the method to samples that are sufficiently large so as to be unaffected by heat loss through the sensors. Here, we develop and validate the infrared microscopy enhanced Ångström's method that overcomes these limitations and enables measurement of microscale samples. This work demonstrates the accuracy and applicability of the technique through measurement of several commercially available polymer monofilaments and films and comparison of the data to published values. This method is particularly robust to uncertainty in emissivity making it attractive for characterization of semitransparent samples.
Infrared Microscopy Enhanced Ångström's Method for Thermal Diffusivity of Polymer Monofilaments and Films
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 11, 2018; final manuscript received April 14, 2019; published online June 12, 2019. Assoc. Editor: Evelyn Wang.
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Hahn, J., Reid, T., and Marconnet, A. (June 12, 2019). "Infrared Microscopy Enhanced Ångström's Method for Thermal Diffusivity of Polymer Monofilaments and Films." ASME. J. Heat Transfer. August 2019; 141(8): 081601. https://doi.org/10.1115/1.4043619
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