Photothermal radiometry measurement of thermal diffusivity

Area of Science:

• Materials Science
• Thermal Physics
• Optical Measurement Techniques

Background:

• Accurate measurement of thermal properties is crucial for material characterization.
• Existing methods for thermal diffusivity measurement may have limitations in certain conditions.
• Photothermal techniques offer non-contact, spatially resolved thermal property analysis.

Purpose of the Study:

• To describe a novel method for measuring the thermal diffusivity of solid materials.
• To validate the photothermal radiometry technique against a standard method.
• To assess the feasibility of room-temperature measurements using this approach.

Main Methods:

• Utilized photothermal radiometry to probe thermal properties.
• Measured amplitude and phase frequency characteristics of the photothermal signal.
• Calculated thermal diffusivity based on the acquired signal data.

Main Results:

• Successfully measured the thermal diffusivity of solid materials at room temperature.
• The results obtained via photothermal radiometry showed good agreement with the pulsed laser conductometer method.
• Demonstrated the efficacy of analyzing frequency-dependent photothermal signal features.

Conclusions:

• Photothermal radiometry is a viable and accurate method for determining thermal diffusivity.
• The described technique provides a reliable alternative for room-temperature thermal property assessment.
• Further research can explore its application to a wider range of materials and conditions.