SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019) 226
Figure 13:1 - 2D Side Looking Probe and Sampling Volume
Signal to Noise Ratio Profile 13.3.3
The signal to noise ratio versus time profile plot for the FlowTracker2 is shown in Figure
13:2.
a) The horizontal axis shows time after the transmit pulse.
b) The vertical axis shows the return signal strength measured by one receiver.
c) As the transmit pulse travels through the water, sound is reflected in all
directions.
d) Immediately following the transmit pulse, reflections come from outside the
receiver beam. The receiver measures only the ambient noise level.
e) As the pulse propagates along the transmit axis, it moves closer to the receiver
beam. The receiver sees an increase in signal strength.
f) Signal strength reaches a maximum at the intersection of transmit and receive
beams.
g) By sampling the return signal at its peak, the FlowTracker2 makes
measurements in the sampling volume defined by the intersection of transmit and
receive beams.
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