A new acoustic Doppler current profiler for shallow water

Cabrera, R.; Huhta, C.; Lohrmann, Atle

doi:10.1109/oceans.1995.528615

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Leurs é metteurs sont incliné s à 20°, 25° ou 30° (angle ). Connaissant la valeur de , on peut calculer des vitesses (Vx, Vy, Vz) dans leur repè re propre, avec la matrice de transfert (1) [5] :…”

Section: Principe De Fonctionnement Des Profileurs De Courantunclassified

Perfecting of a Calibration Bed for Current Profilers

Menn¹,

Morvan²

2020

I2M

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Current profilers are used in oceanography to measure the oceanic circulation but also in hydrology to calculate the flow of rivers. They allow the retrieval in velocity and direction of water masses profiles. The direction of the instrument is obtained via an electronic compass and tilt sensors, and the velocity by the measurement of the Doppler shift of acoustic pulses back scattered by particles located in water cells allocated along the measurement range of the instrument. This paper presents a method developed to test the trueness of these velocity measurements in laboratory, from a spectral analysis of the emitted pulses and from the using of a frequency generator to simulate the received frequencies. Also, an assessment of the calibration uncertainty of this test is made, and the results obtained with different instruments are presented. RÉSUMÉ :les profileurs de courant sont utilisé s en océ anographie pour mesurer la circulation océ anique mais aussi en hydrologie pour calculer le dé bit des fleuves.Ils permettent de retrouver le profil des masses d'eau en vitesse et direction. La direction de l'instrument est obtenue par un compas électronique et un capteur d'inclinaison, et la vitesse par la mesure du décalage Doppler d'impulsions acoustiques ré flé chies par les particules situées dans des cellules d'eau réparties le long de l'étendue de mesure de l'instrument. Ce papier pré sente une mé thode developpé e pour tester la justesse de ces mesures de vitesse en laboratoire, à partir de l'analyse spectrale des impulsions é mises et de l'utilisation d'un générateur de fréquence pour simuler les fréquences reçues. De plus, une évaluation de l'incertitude de mesure de ce test est réalisée, et les résultats obtenus avec diffé rents instruments sont pré senté s.

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Section: Principe De Fonctionnement Des Profileurs De Courantunclassified

Perfecting of a Calibration Bed for Current Profilers

Menn¹,

Morvan²

2020

I2M

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Velocity Calibration of Doppler Current Profiler Transducers

Menn

Morvan

2020

JMSE

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Doppler current profilers are used in oceanography to measure oceanic circulation but also in hydrology to calculate the flow of rivers. They allow the retrieval of water mass profiles in terms of velocity and direction. Direction is obtained via an electronic compass and tilt sensors, while velocity is obtained by measuring Doppler pulse shifts back-scattered by particles located in water cells allocated along the instrument’s measurement range. Current meters are usually tested in towing basins or hydrodynamic channels, but these facilities present limits in terms of the measurement range, particles concentration and time costs. This paper presents a novel method developed to test the trueness of these velocity measurements in the laboratory, along with the uncertainty of this test and the results obtained with current meters and stand-alone profilers. The method is based on the measurement of the frequency of pulses emitted by each transducer of the instrument independently, and on the simulation of received echoes by a variable frequency sinusoidal signal.

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A new acoustic Doppler current profiler for shallow water

Cited by 2 publications

References 9 publications

Perfecting of a Calibration Bed for Current Profilers

Perfecting of a Calibration Bed for Current Profilers

Velocity Calibration of Doppler Current Profiler Transducers

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