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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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General bidirectional thermal characterization via the 3ω technique.

Matthew L Bauer1, Pamela M Norris1

  • 1Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA.

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|July 3, 2014
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Summary

This study presents a novel bidirectional 3ω method to measure thermophysical properties, overcoming fabrication challenges. The new system accurately determines thermal conductivity, heat capacity, and contact resistance under varying pressures.

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Area of Science:

  • Materials Science
  • Thermal Physics
  • Nanotechnology

Background:

  • The 3ω technique is widely used for thermophysical property determination.
  • Fabricating thin metal lines on samples presents challenges for certain materials.

Purpose of the Study:

  • To develop an alternative 3ω experimental geometry to circumvent fabrication issues.
  • To create a thermal mount optimizing sensitivity to thermal conductivity, heat capacity, and contact resistance.
  • To demonstrate a system for measuring thermophysical properties under varying axial pressure.

Main Methods:

  • A bidirectional experimental geometry utilizing contact resistance was employed.
  • A specialized thermal mount was designed and fabricated.
  • A general thermal model was developed and applied to analyze experimental data.

Main Results:

  • The bidirectional system successfully measured thermophysical properties.
  • The thermal mount design enhanced sensitivity to key parameters.
  • Data collection under varying axial pressures was demonstrated as feasible.

Conclusions:

  • The bidirectional 3ω technique offers a viable alternative for materials where traditional methods fail.
  • The developed system and thermal model provide a versatile platform for thermophysical property analysis.
  • Axial pressure significantly influences contact resistance and overall measurement accuracy.