Abstract
The measurement principle of a laser transit anemometer, also referred to as a laser two-focus velocimeter, is based on an optical system which generates a measurement volume consisting of two highly focused laser beams. The diameter of the beam at each focus is of the order of 10 μm with the foci 20-500 μm apart. When a particle moving in a flow scatters light by passing through the two focal points, the particle’s velocity is determined by the time of flight between the beams. Correlated pulses are produced when the focal spots are closely aligned with the flow direction, giving this technique high directional sensitivity. Complete 2-D information about the flow at a particular point can be obtained by accumulating a number of time-of-flight histograms with the focal points set at different measurement angles.
© 1988 Optical Society of America
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