Abstract

This paper shows that spectrally resolved thermal radiation from silica aggregate particles can be used to extract an emissivity and a temperature in the visible regime. Emissivity of silica aggregate particles at temperatures above $2000\mathrm{K}$ is measured by the analysis of emission radiation spectra from the particles. Temperature is estimated from the relation between the emission intensity and the wavenumber. Relative emissivities at temperatures from 2150 to $2919\mathrm{K}$ are presented. Proper knowledge of optical properties for silica aggregate particles will help further the understanding of thermophysics at high temperature.

© 2011 Optical Society of America

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