Velocity Calibration of Doppler Current Profiler Transducers

Menn, Marc Le; Morvan, Steffen

doi:10.3390/jmse8110847

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…On the other hand, based on the Eulerian method instead of the Lagrangian method, the existing literature has also presented Doppler solutions [ 15 , 16 , 17 , 18 ]. Using this approach, the speed of a water column can be measured.…”

Section: Introductionmentioning

confidence: 99%

“…It must also be taken into account that the detection of the particles depends on their size and the parameters of the emitted pulses (e.g., frequency, duration, amplitude, etc.) [ 16 ]. However, since there is no guarantee that the particles, wildlife or anything else that moves within the evaluated column is traveling at the same speed as the measured water, the obtained data may not be valid.…”

Section: Introductionmentioning

confidence: 99%

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Novel Deep-Water Tidal Meter for Offshore Aquaculture Infrastructures

Sosa

Montiel–Nelson

2022

Sensors

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This paper presents a tidal current meter that is based on the inertial acceleration principle for offshore infrastructures in deep water. Focusing on the marine installations of the aquaculture industry, we studied the forces of tides at a depth of 15 m by measuring the acceleration. In addition, we used a commercial MEMS triaxial accelerometer to record the acceleration values. A prototype of the tidal measurement unit was developed and tested at a real offshore aquaculture infrastructure in Gran Canaria, which is one of the Canary Islands in the Atlantic Ocean. The proposed tidal measurement unit was used as a recorder to assess the complexity of measuring the frequency of tidal currents in the short (10 min), medium (one day) and long term (one week). The acquired data were studied in detail, in both the time and frequency domains, to determine the frequency of the forces that were involved. Finally, the complexity of the frequency measurements from the captured data was analyzed in terms of sampling ratio and recording duration, from the point of view of using our proposed measurement unit as an ultra-low-power embedded system. The proposed device was tested for more than 180 days using a lithium-ion battery. This working period was three times greater than the best alternative in the literature because of the ultra-low-power design of the on-board embedded system. The measurement accuracy error was lower than 1% and the resolution was 0.01 cm/s for the 0.8 m/s velocity scale. This performance was similar to the best Doppler solution that was found in the literature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Deep-Water Tidal Meter for Offshore Aquaculture Infrastructures

Sosa

Montiel–Nelson

2022

Sensors

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“…The expendable current profiler (XCP) is a single-use instrument that rapidly measures currents, mainly the velocity and flow direction of seawater, based on the principle that currents cut the geomagnetic field, inducing electromagnetic fields . The commonly used instrumentation methods for the measurement of ocean currents can be classified into floating, electromagnetic, mechanical, acoustic, and other (Peltier, 2013;Simpson, 2001;Jenkins, 2006;Le Menn, 2020). XCP is an electromagnetic current meter that produces rapid measurements using geomagnetism and uses a non-stop and non-recovery mode of operation, offering the advantages of a short detection period, instantaneous data acquisition, wider detection range, and various deployment forms (Niiler, 1991;Zhang, 2014;Hibiya, 2006;Jichang, 2009).…”

Section: Introductionmentioning

confidence: 99%

Development of an Expendable Current Profiler Based on Modulation and Demodulation

Zhou

Zhang

Huang

et al. 2022

Preprint

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Abstract. We designed a low-cost expandable current profiler including software and hardware. An expendable current profiler (XCP) is an observation instrument that rapidly measures currents based on the principle that currents cut the geomagnetic field to induce electric fields. It is important to reduce the cost of an XCP because it is a single-use device. The digitization of the previously developed XCP is carried out underwater, which requires the probe to contain not only analogue circuits for acquiring signals but also digital circuits and digital chips, which are relatively expensive. In this study, an XCP has been developed that adopts signal modulation and demodulation to transmit analogue signals on an enamelled wire, and the signal digitization occurs above the surface of the water. The cost of the instrument is effectively reduced by half while maintaining the ability to measure parameters such as sea current and temperature in real-time. After comparison with data processed from laboratory tests, the acquisition circuit showed accuracy within one-thousandth of one per cent, and the XCP analogue circuit developed for the overall system was stable and reliable. The system exhibited an acquisition accuracy higher than 50 nV for 16 Hz, and the quality of the acquired signal met the requirements for an XCP instrument.

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“…The correction of errors on direction measurements brought by the current profilers installed on mooring cages is introduced by Le Menn et al [3], who developed a calibration platform for magnetic compasses and tilt sensors, following a method perfected in 2007. In combination with this platform, [4] suggested an approach based on the measurement of the frequency of pulses and on the simulation of received echoes, allowing the logging and calibration of most of the current meters manufactured by Nortek Instruments.…”

Section: Introductionmentioning

confidence: 99%

Improved Current Estimates from Spar Buoy-Mounted ADCP Measurement Station: A Case Study in the Ligurian Sea

Bordone

Ciuffardi

Schirone

et al. 2021

JMSE

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Current measurements in the open sea are generally acquired by Acoustic Doppler Current Profilers (ADCPs). In the case of ADCPs mounted on spar buoy, current profiles require to be post-processed, to properly take into account the buoy influence: in fact, ADCP compass may reflect alterations induced by the metal structure of the buoy and apparent currents can occur due to the large displacement of the platform. Uncertainty analysis is finally required to properly consider both these effects and to compute robust velocity estimates. A new methodology is tested for a measurement station in the Ligurian Sea, where an ADCP was mounted on the surface buoy of the W1-M3A (Western 1 Mediterranean Moored Multisensor Array) oceanographic observatory, facing upwards at the depth of about 40 m. Marine current numerical models and historical data in the area have been used as a basis for comparison to test the consistency of the proposed method. A very good agreement is obtained. Only minor discrepancies are reported (e.g., monthly averages from the reference model slightly underestimate the west-east current component along the entire profile), but, in general, the application of the proposed methodology ensures that the spar buoy-mounted ADCP system is able to provide reliable measurements for oceanographic studies and validation of 3D hydrodynamic models.

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Velocity Calibration of Doppler Current Profiler Transducers

Cited by 12 publications

References 25 publications

Novel Deep-Water Tidal Meter for Offshore Aquaculture Infrastructures

Novel Deep-Water Tidal Meter for Offshore Aquaculture Infrastructures

Development of an Expendable Current Profiler Based on Modulation and Demodulation

Improved Current Estimates from Spar Buoy-Mounted ADCP Measurement Station: A Case Study in the Ligurian Sea

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