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