Solar Energy Absorber
Original Publication Date: 1978-Jul-01
Included in the Prior Art Database: 2005-Feb-21
A solar energy absorber is produced by evaporating or sputtering a thin film of a low reflectivity metal, such as chromium, molybdenum, or tungsten, on a film of plastics material, the surface of which has been provided with a topography such as that described in the article `Reduction of Lens Reflection by the "Moth Eye" Principle,' P. B. Clapham and M. C. Hutley, Nature 244, 281-282 (August 3, 1973). The resulting metal foil is then bonded to the surface of a solar energy heat exchanger, and the plastic material removed. The exposed metal surface embossed with the low reflectance topography is an efficient absorber of infrared radiation.