Optical properties of solid particle receiver materials. II. Diffuse reflectance of Norton Masterbeads® at elevated temperatures

  • Stahl K
  • Griffin J
  • Pettit R
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Abstract

An experimental system to measure the diffuse reflectance of a particulate sample over the wavelength range of 300 to 2500 nm at elevated temperatures up to 1000°C has been developed and implemented. A description of the experimental apparatus and measurement procedures, as well as optical reflectance data for the Masterbeads®, are presented. Using the high temperature measurement system, the diffuse reflectance of Masterbeads®changed by less than 1% for sample temperatures from 150°C to 930°C. However, after heating a sample for three hours at 1000°C in air, the solar absorptance measured at room temperature decreased from an initial value of 0.93 to 0.89. © 1986.

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Authors

  • K. A. Stahl

  • J. W. Griffin

  • R. B. Pettit

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