U.S. Geological Survey Open-File Report 2007-1194

Figure 15.  A 5-MHz Ocean Acoustic Doppler Velocimeter mounted on a tripod.

Figure 15. A 5-megahertz ocean acoustic Doppler velocimeter (ADV) mounted on a tripod. The ADV measures water flow in a small volume of water below the transducer assembly using the Doppler shift of sound that occurs when three beams reflect from scatterers in a small measurement volume.