Optical Properties Of Solid Particle Receiver Materials II: Diffuse Reflectance Of Norton MasterbeadsÃ‚Â® At Elevated Temperatures

K. A. Stahl; J. W. Griffin; R. B. Pettit

doi:10.1117/12.966311

2 December 1985 Optical Properties Of Solid Particle Receiver Materials II: Diffuse Reflectance Of Norton Masterbeads® At Elevated Temperatures

K. A. Stahl, J. W. Griffin, R. B. Pettit

Author Affiliations +

Proceedings Volume 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV; (1985) https://doi.org/10.1117/12.966311
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

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 Masterbeadse, 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.

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K. A. Stahl, J. W. Griffin, and R. B. Pettit "Optical Properties Of Solid Particle Receiver Materials II: Diffuse Reflectance Of Norton Masterbeads® At Elevated Temperatures", Proc. SPIE 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV, (2 December 1985); https://doi.org/10.1117/12.966311

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