Principles of Operation 7
© 2018 Nortek AS
1 Principles of Operation
This section covers
Basic Doppler principles
Differences between the Velocimeters
Current measurement and auxiliary sensors
Measurement volumes
Measurement method and measurement accuracy
Velocimetry is the measurement of the velocity of fluids. The name "Velocimeters" belong to a
special class of high-resolution 3D instruments, that comprises the following instruments:
The Vector is a field instrument designed for measurements of rapid small scale changes in 3D
velocity, used for turbulence, boundary layer measurements, surf zone measurements, and
measurements in very low flow areas.
The Vectrino is used in hydraulic laboratories to measure turbulence and velocities in flumes and
physical models. It also comes in a "field" version that has a more rugged design.
The Vectrino Profiler is a profiling version of the Vectrino. Its strength lies in its ability to collect
data comprising of up to 30 cells that are only 1 mm in height.
Common for them is that they are typically used in difficult measurement situations such as
turbulence measurements, very slow, low energy flows, and rapidly varying flows in the laboratory or
the ocean. They can work well in areas with high shear, near boundaries, under breaking waves, and
many other situations. Pulse coherent data from single or small ensemble average measurements
are useful because of the individual measurement accuracy and low noise. In the following part, the
concept of current measurements are divided into relevant topics.
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