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Proceedings Paper

Improvements in vacuum collector tubes with graded AI-N/AI absorbing surfaces
Author(s): Suping Hou; Zuqing Xue; Yueyan Shi; Zhiqiang Yin
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Paper Abstract

A batch coater for depositing selective absorbing surfaces on the outside of 34 inner tubes was set up using cylindrical magnetron sputtering technique. The appropriate process has been carried out to produce graded Al-N/Al selective absorbing surfaces with optimum optical properties. The average solar absorptance of the surface was found to be about 0. 923 and emittance around 0. 06 ( lOOt),after evacuation. Three evacuation systems of 5 0 tubes each were designed and constructed with automatic evacuation process.The as-produced pressure in the tube in lower than 1 X 1O3Pa.

Paper Details

Date Published: 25 November 1992
PDF: 3 pages
Proc. SPIE 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows, (25 November 1992); doi: 10.1117/12.130490
Show Author Affiliations
Suping Hou, Tsinghua Univ. (China)
Zuqing Xue, Tsinghua Univ. (China)
Yueyan Shi, Tsinghua Univ. (China)
Zhiqiang Yin, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 1727:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows

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