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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 55, Iss. 4 — Apr. 1, 1965
  • pp: 432–435

Total Hemispherical Emissivity of Sapphire

A. M. WITTENBERG  »View Author Affiliations


JOSA, Vol. 55, Issue 4, pp. 432-435 (1965)
http://dx.doi.org/10.1364/JOSA.55.000432


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Abstract

A calorimetric method is described which has been used to measure the total hemispherical emissivity of crystal-oriented sapphire. The results of two series of measurements are presented, one with the crystal C axis parallel to the surface normal (0° orientation) and the other with the C axis perpendicular to the normal (90° orientation). In the temperature range of -65° to 100°C the emissivities vary from 0.496 to 0.567 for the 0°-oriented sapphire and from 0.471 to 0.552 for the 90°-oriented material. Error analysis indicates that these results should be accurate to better than ±3%.

Citation
A. M. WITTENBERG, "Total Hemispherical Emissivity of Sapphire," J. Opt. Soc. Am. 55, 432-435 (1965)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-55-4-432

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