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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
Published on: December 5, 2025
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Thermographic laser Doppler velocimetry
Optics Letters
|October 16, 2015
Summary
We developed a new method for measuring gas temperature and velocity simultaneously using special phosphor particles. This technique offers precise, correlated data for fluid dynamics research.
Area of Science:
- Fluid dynamics
- Thermometry
- Laser-based diagnostics
Background:
- Accurate measurement of gas temperature and velocity is crucial for understanding fluid flow.
- Existing techniques may not provide simultaneous, correlated scalar-vector data.
- Thermographic phosphors offer potential for non-intrusive measurements.
Purpose of the Study:
- To develop and demonstrate a novel point measurement technique for simultaneous gas temperature and velocity measurement.
- To utilize thermographic phosphor particles for combined diagnostics.
- To achieve high spatial and temporal resolution for fluid flow characterization.
Main Methods:
- Dispersing BaMgAl10O17:Eu2+ thermographic phosphor particles in the fluid.
- Measuring flow velocity via laser Doppler velocimetry principles based on scattered light frequency.
- Determining gas temperature using a two-color ratio method on phosphorescence.
Main Results:
- Successful demonstration of simultaneous temperature and velocity measurements.
- Achieved temperature precision of 4%-10% in a heated air jet up to 624 K.
- Obtained correlated vector-scalar data with high spatial and temporal resolution.
Conclusions:
- The proposed technique enables simultaneous, correlated gas temperature and velocity measurements.
- This method is effective for fluid flow diagnostics in heated air jets.
- The technique offers a valuable tool for advanced fluid dynamics research.
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