Solar Optical Properties of Thin Films of Ag, Cu, Au, Al, Fe, Cr, and Ni.

摘要

The optical properties of metal-coated window glass have been investigated. Various thicknesses of Ag, Al, Au, Cr, Cu, Fe and Ni were deposited on glass substrates, and the reflectance from the front and back side and the transmittance between 0.4 micrometer and 15 micrometers were measured. The integrated reflectance and transmittance of the solar spectrum, the integrated reflectance of black body radiation at room temperature, and the reflectance and transmittance weighted by the sensitivity of the eye have been calculated. A summary of the results follows: (1) The noble metals, especially Cu, have the best propertie, if a coating with high transmittance of solar radiation and good heat insulation is wanted. But the solar transmittance is limited to about 45%. (2) Au has the best transmission of visible light for a coating which transmits visible solar radiation and infrared solar radiation. (3) The transition metals display poor selective properties compared with the noble metals, but have an advantage in their flat reflectance and transmittance curves, which means that they do not change the color of the reflected or transmitted light. (ERA citation 04:013024)