In this research we studied and measured the response and absorbance for some metals (zinc, copper, iron, aluminum) which are exposed to the direct light and painted with black, which has a high absorbance and low emittance, and with different thickn
esses (to obtain black bodies) with higher absorption. we took the measurement on the painted metals for each thickness of the paint in the laboratory first using tow lamps 30 watt and 100 watt to compare the absorption of these metals of the radiation from these two lamps with the absorption of the solar radiation and make sure that the absorption is similar of the two situations, then we took the measurements in AL- Kadmous Area which is 900m above sea level using direct solar radiation , and we found the relationship between the absorbance and the paint thickness.
In this research we present results of the studying and calculating the optically active
range depth for diffuse light reflected coating at change of the dispersiveness of pigment
grains used in coating and wavelength of incident electromagnetic ra
diation. This coating
consists of zinc oxide powder and organic material that acts as a binding film. The size of
zinc oxide powder grains were changed between 0.2 μm and 10 μm. In addition, the depths
of optically active range of diffuse light reflected coating were calculated when the
absorption coefficient of the pigment used in the ZnO/binder coating changed between
-1 0.1cm and -1 1000cm . The obtained results allow us optimization of the diffuse light
reflecting coatings thickness at preparation determined kinds of them.
