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Updated: Mar 31, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Thermographic laser Doppler velocimetry.

Anthony O Ojo, Benoit Fond, Berend G M Van Wachem

|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.

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Last Updated: Mar 31, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Published on: December 5, 2025

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

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Published on: May 15, 2017

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

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.