Laboratory - Waves
[I-D]

I want to make measurements in a laboratory. [change]
My research involves waves. [change]

Depending on the scales of interest, one of our Acoustic Doppler Velocimeters (ADV) -- either the MicroADV or the ADV -- can be used in wave tanks. The MicroADV is capable of significantly better resolution in both space and time. The MicroADV probe needs to be within 20 m of your PC, while the ADV can be up to 30 m away. Distance (i.e., cable length) is important because of signal attenuation. There is less attenuation with the 10-MHz ADV as compared to the 16-MHz MicroADV.

Because of the strong vertical velocities in a wave environment, a down-looking probe runs the risk of contaminating the measurements with its own wake. In these situations, a side-looking probe is commonly used, with the probe oriented to look "across" the main horizontal direction of flow.

	Each yellow pylon on this walkway supports an individual ADV (top photo). This large-model basin at the U.S. Army Corps of Engineers Waterways Experiment Station in Vicksburg, MS, is designed for the study of currents generated by a wavefield with angled incidence on a model beach (bottom photo). The ADVs are deployed to synchronously gather data across the wavefield through use of RS-485 communication protocol.
	The ADV shown here is being used to study the orbital velocities of a wave field within a flume. The sensor head is mounted to look "sideways", that is, it is perpendicular to the stem (see highlighted box in figure). This places the measurement volume 5 cm away from the stem, minimizing the potential for the vertical velocities to advect the probe wake into the measurements.

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