M9 Acoustic Doppler Profiler

Manufacturer: Sontek
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The RiverSurveyor®, M9 system gives a new perspective to the notion of measuring open channel hydraulics. Using SonTek’s exclusive SmartPulseHD™, multiple acoustic frequencies are fused with precise bandwidth control for the most robust and continuous shallow-to-deep discharge measurements ever. A deterministic microcontroller expertly apportions the proper acoustics, pulse scheme, and cell size to get the highest definition possible so you can focus on the measurement, not the instrument setup. The system even has a vertical beam for precise channel definition and it's all designed to work intuitively.

Key Features

  • Multi-Band (Multiple acoustic frequencies) - balances the highest resolution with the greatest range of depths
  • Vertical acoustic beam - superior channel definition, extends the maximum measurable discharge depth
  • SmartPulseHD™ - an intelligent algorithm that looks at water depth, velocity and turbulence, and then acoustically adapts to those conditions using pulse-coherent, broadband, and incoherent techniques; high-def cell sizes down to 2 cm
  • Microprocessor computed discharge and secure data - all discharge computations are done within the M9 unit internally (not in the computer!); no lost data from communications drop outs
  • Standard 360º compass and two-axis tilt sensor - compensates for vessel motion due to surface conditions
  • Reverberation control with ping rates to 70Hz - high ping rates ensure extremely robust data collection
  • Bottom-tracking - high precision vessel tracking and depth measurement without GPS requirement
  • RTK GPS (optional) - ultra precise earth-referenced positioning as an alternative to bottom tracking in moving bed or other difficult situations

Velocity Measurement

  • Profiling Range (Distance): 0.06 to 40m
  • Profiling Range (Velocity): ±20 m/s
  • Accuracy:±0.25% of measured velocity
  • Resolution: 0.001 m/s
  • Number of Cells: Up to 128
  • Cell Size: 0.02 to 4m

Transducer Configuration

  • 9 transducers
  • Dual 4-beam 3.0 MHz/1.0 MHz
  • Janus at 25° slant angle
  • 0.5 MHz vertical beam

Depth Measurement

  • Range: 0.20 to 80m
  • Accuracy: 1%
  • Resolution: 0.001 m

Discharge Measurement

  • Range with Bottom-Track: 0.3 to 40m
  • Range with RTK GPS: 0.3 to 80 m
  • Computations: Internal