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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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New contactless method for thermal diffusivity measurements using modulated photothermal radiometry.

S Pham Tu Quoc1, G Cheymol1, A Semerok1

  • 1French Alternative Energies and Atomic Energy Commission, Division of Nuclear Energy, DEN/DANS/DPC/SEARS/LISL, 91191 Gif/Yvette, France.

The Review of Scientific Instruments
|June 2, 2014
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Summary

A new modulated photothermal radiometry method accurately determines thermal diffusivity in metals using a simple formula. This contactless technique is ideal for characterizing nuclear components and other hard-to-reach materials.

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Area of Science:

  • Materials Science
  • Thermal Physics
  • Non-Destructive Testing

Background:

  • Modulated photothermal radiometry (MPR) is a contactless, non-destructive technique for material characterization.
  • MPR offers a high signal-to-noise ratio and low dependence on heating power and surface optical properties.

Purpose of the Study:

  • To present a novel method for determining material thermal diffusivity using MPR.
  • To develop a simple formula for calculating thermal diffusivity based on phase shift and sample geometry.

Main Methods:

  • Utilized a three-dimensional analytical model to analyze temperature amplitude and phase during laser heating of a plate sample.
  • Developed a new formula derived from multi-parametric analysis to calculate thermal diffusivity.
  • Applied the method to various metals including stainless steel, nickel, titanium, tungsten, molybdenum, zinc, and iron.

Main Results:

  • The new method accurately determined the thermal diffusivity of metals with 5%-10% accuracy.
  • Established the applicable thickness range for the method as r0/100 ≤ L ≤ r0/2.
  • Demonstrated the method's effectiveness for characterizing nuclear components.

Conclusions:

  • The developed formula provides a straightforward way to determine thermal diffusivity using MPR.
  • This technique is highly suitable for characterizing barely accessible components requiring contactless measurements.
  • The method shows promise for quality control and material analysis in various industrial applications.