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12.2.
FlowTracker2 CSV Output .......................................................................... 207
12.2.1
CSV File Structure............................................................................................................. 207
12.2.2
CSV Variables ................................................................................................................... 208
12.3.
Original FlowTracker ASCII vs JSON ......................................................... 216
Section 13.
Principle of Operations ......................................................................... 224
13.1.
FlowTracker2 Overview .............................................................................. 224
13.2.
The Doppler Shift ........................................................................................ 224
13.3.
Bistatic Doppler Current Meters .................................................................. 225
13.3.1
Bistatic Doppler Operation ................................................................................................ 225
13.3.2
The FlowTracker2 Measurement Principle ....................................................................... 225
13.3.3
Signal to Noise Ratio Profile ............................................................................................. 226
13.4.
Pulse-Coherent Processing ........................................................................ 227
13.5.
Beam Geometry and 3D Velocity Measurements ....................................... 228
13.6.
Sampling Volume Definition ........................................................................ 228
13.7.
Velocity Data Coordinate System ............................................................... 229
13.7.1
2D Side-Looking Probe (Figure 30a) ................................................................................ 229
13.7.2
2D/3D Side-Looking Probe (Figure 30b) ........................................................................... 229
13.8.
FlowTracker2 Data ...................................................................................... 230
13.8.1
Basic Sampling Strategy ................................................................................................... 230
13.8.2
Velocity Data ..................................................................................................................... 230
13.8.3
Accuracy of Velocity Data ................................................................................................. 230
13.8.3.1
Optimizing of FlowTracker2 ............................................................................................ 230
13.8.3.2
Factors Influencing Accuracy .......................................................................................... 231
13.8.4
Quality Control Data .......................................................................................................... 231
13.9.
Special Considerations ............................................................................... 231
13.9.1
Probe Configurations ........................................................................................................ 231
13.9.1.1
Probe mounting ............................................................................................................... 231
13.9.1.2
Probe type ....................................................................................................................... 231
13.10.
Sound Speed ........................................................................................... 232
13.10.1
Sound Speed Function .................................................................................................. 232
13.10.2
Compensate for Changes ............................................................................................. 232
13.10.3
Environmental Conditions ............................................................................................. 232
13.11.
Flow Interference ..................................................................................... 233
13.11.1
Structures ...................................................................................................................... 233
13.11.2
Probe orientation relative to flow ................................................................................... 233
13.11.3
Mounting Correction ...................................................................................................... 234
13.11.3.1
No Correction ................................................................................................................ 234
13.11.3.2
Custom Correction ........................................................................................................ 234
13.12.
Dynamic Pressure (Pressure Sensor) ..................................................... 235
Section 14.
FlowTracker2 Desktop Software .......................................................... 237
FlowTracker2 User's Manual (January 2019)
SonTek - a Xylem brand
10
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