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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

[Development of transient pyrometer based on multi-spectral radiation technology].

Yang Zhai¹, Hua Shen, Ri-hong Zhu

¹School of Electronic Engineering and Photoelectric Technology, Nanjing University of Science & Technology, Nanjing 210094, China. optic_njust@126.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|February 3, 2011

Summary

This study introduces a novel pyrophotometer for accurately measuring transient plasma flame radiant temperatures. The device utilizes Planck

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An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue

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Area of Science:

Plasma physics and high-energy electromagnetism.
Thermodynamics and blackbody radiation.
Optical engineering and spectroscopy.

Context:

Accurate measurement of transient plasma flame radiant temperature is crucial for modern dynamics systems, particularly for describing flying object status and trajectory cauterization.
Existing measurement methods, such as traditional pyrophotometers and CCD arrays, are inadequate due to the extreme temperatures and transient nature of these phenomena.

Purpose:

To develop and validate a novel pyrophotometer capable of measuring the radiant temperature of transient plasma flames.
To overcome the limitations of conventional measurement techniques in dynamic systems.

Summary:

A new pyrophotometer is presented, based on Planck's law (blackbody radiation law) and a multi-channel spectrum radiation method.
This device can select specific spectra within the 300-860 nm wavelength range in 2 nanoseconds.
High-definition diffraction grating and fiber optics ensure spectral accuracy, validated by experiments using high-speed photodetectors.

Impact:

Provides a valid and accurate method for measuring the radiant temperature of object surfaces in dynamic systems.
Enables more precise characterization of high-temperature transient phenomena.
Potential applications in aerospace, materials science, and other fields requiring high-speed thermal measurements.