Abstract
Radiation transfer in highly scattering ceramics is described by a diffusion approximation based on the asymptotic relation of the radiant flux and the radiant energy density in material depth. In this approximation, a calculation of the effective absorption coefficient k and the radiation diffusion coefficient D is based on the measurement of normal-hemispherical transmission of specimens shaped as various-thickness disks. Taken into account are radiation field, twodimensionality, and the radiation boundary reflection effect. The optical property measurements have been performed on the experimental apparatus based on an integrating sphere, a collimated radiation source, and a twochannel data acquisition and processing system. Results of the measurements of k and D for the silica ceramic are given at room temperature.
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Moiseev, S.S., Petrov, V.A. & Stepanov, S.V. Measurement of optical properties of highly scattering ceramic materials. Int J Thermophys 11, 587–596 (1990). https://doi.org/10.1007/BF00500848
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DOI: https://doi.org/10.1007/BF00500848