controlled in two horizontal directions allowing automatic recording of velocity
at precise, predetermined locations throughout the testing area. Usually, velocity
data are collected on a uniformly spaced grid with the probe collecting a time
series of instantaneous velocities at each grid point before moving to the next
location. The velocity time series in the two orthogonal horizontal directions at
each point are averaged to provide two components of the velocity vector.
Sampling rate and duration are adjustable, but typically data are collected at a
100-Hz rate for 10 sec at each point. Because the flow is quasi-steady, the final
result is a map of velocity vectors detailing the flow throughout the measurement
region.
Figure 5. View of traversing system looking down through glass bottom
Velocity measurements using the traversing LDV system require a