Instruction Manual
NivuFlow Stick
Page 20
NivuFlow Stick - rev. 00 / 27.01.2020
Fig. 20-2 Situation at second signal detection
The DSP checks both received reflection patterns for similarities using the cross correlation
method. All existing signal differences (caused by new or rotated particles) are rejected so
that two similar but temporarily offset signal patterns are left for velocity evaluation.
Depending on the flow levels both patterns are subdivided into 16 measurement windows.
Fig. 20-3 Echo signal images and evaluation
Based on the beam angle, the interval between both transmitted signals and the shift of the
signal pattern therefore in each single measurement window the flow velocity can be deter-
mined.
It mathematically strings the single flow velocities together which results in the flow profile of
the acoustic path.
This measured velocity profile is directly indicated on the NivuFlow Stick display (Fig. 20-4
pict. 1). Clicking the graph will switch over to lateral profile view (Fig. 20-4 pict. 2).
Fig. 20-4 Determined flow profile