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Effective Thermal Diffusivity Measurement Using Through-Transmission Pulsed Thermography: Extending the Current

Zain Ali1, Sri Addepalli1, Yifan Zhao1

  • 1Faculty of Engineering and Applied Sciences (FEAS), Cranfield University, Cranfield MK43 0AL, UK.

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|February 26, 2025
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Summary
This summary is machine-generated.

This study introduces a simpler method for measuring material thermal diffusivity using through-transmission pulsed thermography (PT). The new approach, utilizing finite element analysis (FEA) and a novel fitting algorithm, proves more reliable and repeatable than existing techniques.

Keywords:
finite element analysisfull-factorial designinfrared thermographypulsed thermographythermal diffusivitythrough transmission

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Area of Science:

  • Materials Science
  • Non-Destructive Testing (NDT)
  • Thermal Analysis

Background:

  • Through-transmission pulsed thermography (PT) is an effective NDT method for material thermal diffusivity assessment.
  • PT in transmission mode offers superior defect resolution and deeper defect detection compared to reflection mode.
  • Current thermal diffusivity measurement systems are often costly and require stringent experimental conditions.

Purpose of the Study:

  • To present a simple, repeatable laboratory methodology for determining thermal diffusivity using through-transmission PT.
  • To compare the performance of Parker's half-rise equation with a new least squares fitting (NLSF) algorithm for thermal diffusivity estimation.
  • To optimize experimental parameters like flash energy and sample thickness via design of experiments (DOE).

Main Methods:

  • Implementation of a through-transmission pulsed thermography (PT) setup.
  • Integration of finite element analysis (FEA) with laboratory experiments.
  • Application of a full-factorial design of experiments (DOE) to optimize parameters.
  • Estimation of thermal diffusivity using Parker's equation and the new least squares fitting (NLSF) algorithm.

Main Results:

  • The NLSF algorithm demonstrated greater robustness against noise and higher repeatability in thermal diffusivity measurements compared to Parker's method.
  • The NLSF algorithm successfully estimated thermal diffusivity, input flash energy, reflection coefficient, and data capture time delay.
  • Design of experiments identified optimal flash energy and sample thickness for reliable thermal diffusivity estimation.

Conclusions:

  • The developed methodology provides a simpler and more cost-effective approach to thermal diffusivity measurement using through-transmission PT.
  • The NLSF algorithm is a more efficient and reliable technique for thermal diffusivity estimation, offering additional parameter insights.
  • This work enhances the practical application of through-transmission PT for material characterization.