Plan view of acoustic Doppler velocity meter

Figure 2. Plan view of acoustic Doppler velocity meter (ADVM) side-looking measurement scheme. Measurement range is divided into cells (or bins), based on acoustic travel time. Index velocity is taken as the result from one cell, or the average of a range of cells, depending on which works best as a proxy for independently measured, cross-sectionally averaged velocity. From Levesque and Oberg (2012).