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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
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Related Experiment Video

Updated: Jun 19, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

True temperature measurement on metallic surfaces using a two-color pyroreflectometer method.

D Hernandez¹, A Netchaieff, A Stein

¹Procédés, Matériaux et Energie Solaire (PROMES), Centre National de la Recherche Scientifique (CNRS), 7 Rue du Four Solaire, 66120 Font-Romeu, France. daniel.hernandez@promes.cnrs.fr

The Review of Scientific Instruments

|October 2, 2009

Summary

This summary is machine-generated.

Bicolor pyroreflectometry accurately measures high temperatures of metallic surfaces without needing emissivity data. This optical pyrometry method validates true temperature measurements against thermocouples for various metals.

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Area of Science:

Thermodynamics
Optical Physics
Materials Science

Background:

Accurate temperature measurement of hot metals is crucial in industrial processes.
Traditional optical pyrometry faces challenges due to unknown thermo-optical properties and parasitic radiation.
Emissivity variations in metallic surfaces complicate in situ temperature determination.

Purpose of the Study:

To assess the efficacy of bicolor pyroreflectometry for determining true temperatures of metallic surfaces above 500°C.
To validate the method's accuracy by comparing results with thermocouple measurements.
To evaluate the method's performance across different metallic materials and surface roughness.

Main Methods:

Developed a bicolor pyroreflectometry technique based on Planck's and Kirchhoff's laws.
Utilized two close wavelengths (1.3 and 1.55 µm) and assumed identical reflectivity indicatrixes.
Introduced a diffusion factor eta(d) to determine convergence temperature T(*), approximating true temperature T.
Conducted experiments on tungsten, copper, and aluminum samples with varying roughness.

Main Results:

The method successfully determined the true temperature of metallic surfaces without prior knowledge of emissivity.
Experimental results showed good agreement between the convergence temperature T(*) and thermocouple measurements.
The technique proved effective for both rough and specular metallic surfaces.

Conclusions:

Bicolor pyroreflectometry is a reliable method for non-contact temperature measurement of hot metals.
The technique overcomes limitations of traditional optical pyrometry, particularly for unknown emissivity conditions.
This method offers a valuable tool for industrial applications requiring precise high-temperature measurements.