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A modified evaluation method to reduce finite pulse time effects in flash diffusivity measurement.

Ye Tao1, Liping Yang1, Qiu Zhong1

  • 1The Shanghai Institute of Ceramics, Chinese Academy of Sciences, No.1295 Dingxi, Load, 200050 Shanghai, China.

The Review of Scientific Instruments
|January 3, 2016
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Summary

A new modified evaluation method for laser flash analysis improves thermal diffusivity measurements by considering laser heating cutoff time. This approach enhances the applicability of the flash method for materials science research.

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Area of Science:

  • Materials Science
  • Thermal Analysis
  • Heat Transfer

Background:

  • Accurate thermal property measurement is crucial for material characterization.
  • The laser flash method is a standard technique for determining thermal diffusivity.
  • Existing methods have limitations in accurately defining laser heating effects.

Purpose of the Study:

  • To propose a modified evaluation method for laser flash analysis.
  • To improve the accuracy and applicability of thermal diffusivity measurements.
  • To establish a new approach for quantifying laser effect depth.

Main Methods:

  • Developed a modified evaluation method considering laser heating cutoff as time zero.
  • Utilized approximate analytical solutions for sample temperature distribution during heating.
  • Employed weighted-average and approximate-equation methods to determine laser effect depth.

Main Results:

  • Obtained formulas for penetration depth and temperature distribution.
  • Quantitatively determined laser effect depth, leading to a modified evaluation method.
  • Simulation and experimental results validated the modified method's correctness.

Conclusions:

  • The modified laser flash evaluation method enhances measurement accuracy.
  • This approach significantly broadens the applications of the flash method.
  • The method is applicable when laser penetration depth does not exceed sample thickness.