Development of Novel Thermal Diffusivity Analysis by Spot Periodic Heating and Infrared Radiation Thermometer Method.

Area of Science:

• Materials Science
• Thermal Physics
• Non-Destructive Testing

Background:

• Spot periodic heating is a precise, non-contact technique for assessing thermophysical properties and anisotropy.
• Accurate thermal diffusivity evaluation is challenging due to temperature wave reflections from sample surfaces.

Purpose of the Study:

• To develop a method for accurate thermal diffusivity determination using spot periodic heating.
• To address the limitations of temperature wave reflection in thermal diffusivity measurements.

Main Methods:

• A novel method using a parameter table derived from heat transfer equations.
• Optimization of the distance between heating and measurement points.
• Consideration of finite sample size, detector sensitivity, laser intensity, and sample thickness.

Main Results:

• The proposed method successfully derived thermal diffusivity.
• Obtained thermal diffusivity values for pure copper aligned with existing literature.
• Demonstrated high effectiveness in evaluating horizontal thermal diffusivity.

Conclusions:

• The developed method enhances the accuracy of thermal diffusivity measurements.
• This technique is highly effective for evaluating anisotropic thermal properties.
• It offers a reliable approach for non-contact thermophysical property assessment.