The combined velocity-density-vorticity (VDV) sensor: a report on its first use

Abstract

We have developed a general-purpose sensor to measure several flow properties simultaneously. The instrument is very compact, simple to use, accurate, and cost-effective. VDV can measure 3dimensional velocity, buoyancy flux and vorticity using advanced ultrasonics. The measurements are simultaneous and are sampled in the same volume ofwater. This guarantees very high correlation between the velocity, density and vorticity data. This is essential in energetic, rapidly fluctuating coastal environments, as well as in some low-speed deep ocean applications. We have completed a series of tests in a large laboratory tow-tank and in a wave flume at the Canada Centre for Inland Waters. This paper will report on the initial results of the tests.