Abstract
An attempt to derive the hemispherical total emissivity from the normal emission spectrum is proposed for Vycor and fused silica glasses. The normal emission spectrum from a clear surface has been measured at steady state in the temperature range from 400 to 750 K. The sample is heated on one metal-backed face by thermal radiation from a heater. Temperatures inside the sample were monitored by thermocouples at two points near the surfaces. Evaluation of the hemispherical total emissivity from the normal emission spectrum is determined by means of Kramers–Krönig analysis and virtual mode equations. Assuming a linear temperature distribution within the sample, the thermal conductivities of silicate glasses were obtained at elevated temperatures. The results are comparable with those obtained by previous investigators. The effect of radiation heat transfer in a sample is also discussed.
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Tanaka, H., Sawai, S., Morimoto, K. et al. Evaluation of Hemispherical Total Emissivity for Thermal Radiation Calorimetry. International Journal of Thermophysics 21, 927–940 (2000). https://doi.org/10.1023/A:1006670409740
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DOI: https://doi.org/10.1023/A:1006670409740