Curve of reflectance
The curve of reflectance is defined by the quantity of energy re-emitted compared to the quantity of received energy and that for all the wavelengths covering the visible spectrum, even the close relation Infra-rouge and the Ultraviolet.
The instrumentation gives today good performances for intervals of 20nm, 10nm and 5nm. Certain apparatuses are more precise but the answer in interval is not regular. One can have intervals varying from 3 to 10 Nm on the totality of the spectrum.
One of the concrete applications of measurements of reflectance is that of the military camouflages. So that a camouflage is really effective, it is not only necessary that the colors which constitute it is defined with precision in the visible one (for example black, maroon, green, beige) but also in the infra-red. Indeed, with the development of the modern means of detection such as infra-red detection and the equipment of night vision, it became necessary that the colors are different from/to each other in the infra-red. The military camouflaged fabrics thus have always a precise specification concerning the infra-red reflectance of each color of the camouflage. If the curves of reflectance of the various colors were the same ones, the carrier of camouflaged clothing, seen with the infra-red glasses, then seems a silhouette quite visible and thus vulnerable. Generally, the important frequencies for a fabric of camouflage lie between 700 and 1200 Nm.
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