Xylem SonTek FlowTracker2 - 13.7. Velocity Data Coordinate System; 13.7.1 2 D Side-Looking Probe (Figure 30 a); 13.7.2 2 D;3 D Side-Looking Probe (Figure 30 b)

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019) 229
d) The physical size of the sampling volume is a cylinder 6 mm (0.24 in) in diameter
by 9mm (0.35 in) in length (see Figure 13:1).
13.7. Velocity Data Coordinate System
FlowTracker2 velocity measurements are reported using a right-hand Cartesian
coordinate system relative to the probe. The XYZ coordinate systems for each probe
type are shown below.
Figure 13:4 - FlowTracker2 Probe XYZ Coordinate System
2D Side-Looking Probe (Figure 30a) 13.7.1
a) The positive Z-axis is defined as vertically up in the direction of the probe’s stem.
b) The positive X-axis is defined perpendicular to both the probe’s stem and the
axis of the transmit transducer in the direction of receiver arm #1 (marked with a
red band).
c) The positive Y-axis is defined along the axis of the transmit transducer from the
transmitter towards the sampling volume (making a right-handed coordinate
system).
2D/3D Side-Looking Probe (Figure 30b) 13.7.2
a) The positive Z-axis is defined as vertically up in the direction of the probe’s stem.
b) The positive X-axis is defined perpendicular to both the probe’s stem and the
axis of the transmit transducer in the direction of receiver arm #1 (marked with a
red band).
c) The positive Y-axis is defined along the axis of the transmit transducer from the
transmitter towards the sampling volume (making a right-handed coordinate
system).