Under normal environmental conditions, the electromagnetic radiation emitted by radiating sources only reaches a receptor after having passed through the atmosphere. But note that the presence of this material medium is not required for propagation: unlike waves whose natures are different such as mechanical vibrational waves or thermal waves, and whose existence is tied to the temporary modification of local properties of the material support, electromagnetic energy is capable of progression through a vacuum. Moreover its progression there is excellent since the route through a vacuum is effected without losses whilst a path through matter, whether gaseous, liquid or solid, is accompanied by degradations whose origin depend upon the physical state and the composition of the medium.
KeywordsModulation Transfer Function Optical Beam Spherical Wave Turbulent Atmosphere Turbulent Medium
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