Abstract
We have derived an expression for the photocurrent-correlation function for a cross-beam laser velocimeter, taking into account the effects of atmospheric turbulence on the amplitude and phase of the incident beams. The fringe model is used, and the scattering particles are assumed to have a well-defined velocity V. As long as the atmospheric disturbances do not greatly damp out the sinusoidal variations of the photocurrent-correlation function in the time it takes a particle to travel the fringe-separation distance, the disturbances do not hinder the determination of the velocity of the particles from the correlation function. This is well satisfied under typical atmospheric conditions.
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