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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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Cavity methods for determining the emittance of solids.

E M Sparrow, P D Kruger, R P Heinisch

|February 4, 2010

Summary

This study presents analytical results for radiation in cavities with nonisothermal walls, aiding experimental determination of solid material emittance. The findings enable simultaneous measurement of emittance and surface temperature.

Area of Science:

Thermodynamics
Heat Transfer
Materials Science

Background:

Experimental determination of solid emittance is crucial for thermal management.
Cavity-based methods are employed to mitigate surface condition effects.
Nonisothermal wall conditions in cavities present unique challenges for accurate emittance measurement.

Purpose of the Study:

To develop analytical solutions for radiation heat transfer in cavities with nonisothermal walls.
To provide a framework for experimental determination of solid material emittance using cavity methods.
To enable simultaneous measurement of material emittance and surface temperature.

Main Methods:

Solving coupled problems of radiative transport within the cavity.
Implementing two-dimensional heat conduction analysis in the bounding solid.

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Analyzing radiant flux from the cavity base as a function of emittance and cavity geometry.

Main Results:

Radiant flux results are presented as a function of emittance, depth-radius ratio, and temperature gradient parameter.
The study provides data to correlate cavity radiance measurements with material properties.
A method for simultaneous determination of emittance and exposed face temperature is described.

Conclusions:

The analytical results facilitate accurate experimental determination of solid emittance.
The developed method allows for simultaneous measurement of emittance and surface temperature.
This work enhances the reliability of thermal property measurements in materials science.