Try measuring the infrared radiation of the permissions function during the second wave length and surface temperature of reflection thinking using a temperature known to occupy that SIDA object.
Coefficient measuring infrared radiation in the wavelength range districts. And the reflection surface temperature by using a black cover on the temperature of the material covered.
The experiment were the right infrared radiation at the wavelength of two neighborhoods. And I think the reflection surface temperature by using the cover note cover cedar temperature objects.