LASER VELOCIMETRY

 
 
 

Argon ion laser beams intersect in the measurement volume above a full-span wing in the John J. Harper Wind Tunnel. The component of velocity measured is in the plane of the two beams, and is perpendicular to the line bisecting the angle between the two beams. One beam is shifted in frequency by 40MHz relative to the other: this allows us to determine the sign of the velocity component in flows where there may be reversal of direction.

Rotor-Wing Flowfield: Vorticity Contours and Velocity Field:


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