Scintillation is changing of light from bright light to dim light in a given period of time

Scintillation is changing of light from bright light to dim light in a given period of time. The intensity of light changing is called atmospheric scintillation is the changing of light of a receiver that detects the signal from a transmitter. In other term, scintillation degrades Free Space Optics performance due to its temperature fluctuations of the signals received at the detector that is caused by variation in refractive indicator in transmitting path because of the temperature change. These indicators change because of the atmosphere to act like a series of small lenses that deflect portions of the light beam into and out of the transmit path.