Directional Waverider 4

The Directional Waverider that integrates wave and current measurements

The wave sensor of the Directional Waverider equipped with the Acoustic Current Meter option (DWR4/ACM for short) is identical to the sensor in the well-known Directional Waverider MkI, II and III. Processing of the measured data is now performed at the doubled sample frequency of 2.56 Hz. The high frequency limit of the heave and direction signals is shifted from 0.58 to 1.0 Hz. With this choice, the high frequency limit of the wave buoy is determined by the hydrodynamic response of the hull, not by the onboard instrumentation.

In addition, the DWR4 transmission protocol allows for a superior heave and horizontal displacement resolution. Easy comparison of the new DWR4 output to the familiar DWR-MkIII results is facilitated in the accompanying Waves5 software suite.

• Sensor
  wave motion sensor based on a stabilised platform, accelerometers, and magnetic compass

• Measures
  – wave height for wave periods of 1 to 30 seconds, accuracy 0.5 % of measured value
  – wave direction
  – surface current
  – water temperature
• Additional features
  – GPS for buoy monitoring and tracking through HF link
  – internal logger
  – power switch
  – LED flash antenna
  – 0.9 m (0.7 m) diameter spherical hull of AISI 316 including eccentric mooring eye
  – optional Cunifer hull, excellent against bio-fouling
  – 1.6 years (10 months) battery life