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Updated: Jan 28, 2026
09:10
The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
Published on: December 5, 2025
620
Automatic thermal conductivity measurements with 3-omega technique.
D A Chernodoubov1, A V Inyushkin1
1National Research Center "Kurchatov Institute," Moscow 123182, Russia.
The Review of Scientific Instruments
|March 6, 2019
Summary
This study introduces an automated 3-omega system for thermal conductivity measurements, eliminating manual tuning. Sapphire (Al2O3) measurements validated the improved system, showing good agreement with reference data.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thermal Transport
Background:
- Accurate thermal conductivity measurement is crucial for material characterization.
- Traditional 3-omega methods often require manual adjustments, limiting efficiency.
- Automation in measurement systems enhances precision and reproducibility.
Purpose of the Study:
- To develop an automated 3-omega system for thermal conductivity measurements.
- To eliminate the need for manual resistance tuning in the 3-omega technique.
- To validate the improved system using a well-characterized material.
Main Methods:
- Implementation of an electrical circuit with negative feedback to compensate for the first harmonic voltage.
- Integration of automated control for the 3-omega measurement process.
- Measurement of thermal conductivity on single crystal sapphire (Al2O3).
Main Results:
- The automated system successfully eliminated manual resistance tuning.
- Experimental thermal conductivity values for sapphire were obtained.
- The measured thermal conductivity of sapphire showed good agreement with established reference data.
Conclusions:
- The improved 3-omega system enables efficient and accurate automatic thermal conductivity measurements.
- The negative feedback circuit effectively compensates for voltage harmonics.
- This automated approach is suitable for precise characterization of material thermal properties.
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