The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

作者： Alesanmi R. Odufisan1, Benjamin Stern2, Ryohei Nagahiro3, Rosemary Wynnychenko2,4, Sevan Chanakian5, Junichiro Shiomi3,6, Eleonora Isotta7, Oluwaseyi Balogun2 1Department of Theoretical and Applied Mechanics,Northwestern University, 2Department of Mechanical Engineering,Northwestern University, 3Institute of Engineering Innovation,The University of Tokyo, 4Department of Physics,Wellsley College, 5Department of Chemical Engineering and Materials Science,Michigan State University, 6Department of Mechanical Engineering,The University of Tokyo, 7Department of Materials Science and Engineering,Northwestern University

简介：

Overview

This article presents the Frequency Domain Thermoreflectance (FDTR) technique for local nondestructive thermal characterization and imaging. The study focuses on how microscale defects in materials, such as grain boundaries, affect thermal connectivity with micron scale spatial resolution.

Key Study Components

Area of Science

• Thermal characterization
• Material science
• Nondestructive testing

Background

• Understanding thermal properties at small length scales is crucial.
• Continuum scale assumptions may not hold true at microscale.
• Grain boundaries can significantly influence thermal connectivity.
• FDTR provides a method for imaging these properties.

Purpose of Study

• To investigate the impact of microscale defects on thermal properties.
• To demonstrate the FDTR technique for thermal imaging.
• To provide insights into material behavior at small scales.

Methods Used

• Activation of a 532 nanometer diode laser.
• Stabilization of laser temperature before use.
• Measurement of probe laser power using a power meter.
• Utilization of a pump laser diode controller.

Main Results

• FDTR effectively characterizes thermal properties at the microscale.
• Microscale defects were shown to affect thermal connectivity.
• Results provide a deeper understanding of material behavior.
• Technique allows for nondestructive imaging of thermal characteristics.

Conclusions

• FDTR is a valuable tool for thermal analysis in materials science.
• Understanding microscale defects is essential for material optimization.
• The study enhances knowledge of thermal properties at small scales.

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