Acoustic Doppler Current Profiler 75 kHz
Acoustic Doppler Current Profilers (ADCP) are hydroacoustic instruments, similar to sonars. ADCPs measure current speed and direction at multiple predetermined depths simultaneously. ADCPs use the Doppler effect of sound waves that are scattered by particles in seawater over a depth range.
The travelling time of sound waves gives an estimate of distance, and the increase (blue shift) or decrease (red shift) in frequency is converted into water current velocities.
RDI Teledyne Acoustic Doppler current profilers are configured to monitor water currents at several frequencies. The instruments contain sensors for temperature, pressure, tilt and compass heading. RDI ADCPs use four beams to measure current velocity so that the fourth beam/transducer can substitute for a blocked or damaged beam or it can be used to increase data accuracy. The RDI Long Ranger are instruments that monitor currents at 75 kHz and at ranges up to 600 metres. In our area we typically get good data to 500m.
Individual instruments of the above category, which are (or have been) connected to our observatories. Click an instrument for detailed information.
Click the instrument categories below for descriptions and lists of instruments belonging to that category.