Noun
Doppler broadening
(physics) The broadening of the spectral lines of a high-temperature or rapidly-rotating object due to redshifting of spectral lines from atoms and molecules moving away from the observer and blueshifting of spectral lines from atoms and molecules moving toward the observer.
The Doppler broadening of gases in motion allows the determination of properties via the resulting frequency shift. citation citation Scanning lidars, such as the conical-scanning NASA HARLIE LIDAR, have been used to measure atmospheric wind velocity. Source: Internet