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Doppler Current Sensor (DCS)

The Aanderaa Doppler Current Sensor is based on the backscatter acoustic Doppler principle.

The Aanderaa Doppler Current Sensor is a rugged, true vector averaging sensor for measuring current speed and direction in the sea. The sensor has built-in compass and tilt sensor and may also output sea temperature. The speed range is 0 to 300 cm/s. Low current drain and flexible sampling schemes.


ZPulse DCS

New multi-frequency Doppler Current Sensor (DCS) with ZPulse technology achieves better performance using only half the power than previous models.

The new, fast response compass and tilt circuitry has no moving parts achieving excellent performance in unstable areas such as in the wave zone close to surface.

1. The Seaguard platform and the smart sensor are interfaced by means of a reliable CANbus interface (AiCaP), using XML for plug and play capabilities.

2. Please note: All further improvement of software and calibration will be prioritized on new protocol. Limitations in the older electronic design may prevent us from including future improvements in the "old" sensor. If possible select a sensor from the second generation DCS Z-Pulse.

3. RS-422 output for use as stand-alone sensor with long cables.

4. SR-10 is the old AADI ten-bit code used with an AADI datalogger.

5. 4100R also has a SR-10 output but with reduced capacity of sensor in a chain.

6. The response time for temperature measurement is much faster for the 4830/4830R and 4930/4930R sensor compared to 4100/4100R.

7. ZPulse technology which improves the statistical precision. Complex acoustic pulses comprising several distinct frequencies are combined into a single acoustic pulse. The ZPulse based DCS separates the received signal into different frequency bands, one for each frequency in the transmitted signal. Further it analyses the frequency shift using a high speed Digital Signal Processor using an ARMA based parametric model processing algorithm to find the Doppler shift frequencies. This multi-frequency technique reduces the required number of pings needed in order to achieve an acceptable statistical error. The achieved measurement precision is proportional to the inverse of the square root of the number of ping measurements in a measurement interval. The ZPulse DCS uses two frequencies and this gives a reduction by a factor square root of two compared to a single frequency sensor. A single frequency sensor needs twice the number of ping to achieve the same precision as the Zpulse DCS.

 

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