Affiliation:
1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907 e-mail:
Abstract
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.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference32 articles.
1. XVII. New Method of Determining the Thermal Conductibility of Bodies;Philos. Mag. Ser. 4,1863
2. Simple Apparatus for the Measurement of Thermal Diffusivity Between 80–500 K Using the Modified Ångström Method;Rev. Sci. Instrum.,1980
3. Modified Angström's Method for Measurement of Thermal Diffusivity of Materials With Low Conductivity;Rev. Sci. Instrum.,1987
4. Thermal Diffusivity Measurements by Ångström's Method in a Fluid Environment;Int. J. Thermophys.,1991
5. Wagoner, G., Skokova, K. A., and Levan, C. D., 1999, “Angstrom's Method for Thermal Property Measurements of Carbon Fibers and Composites,” 24th Biennial Conference on Carbon, Charleston, SC, July 12.
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