A Buoyant Tethered Sphere for Marine Current Estimation

Autor:	Michael Santarossa, Severine Choukroun, James Whinney, Thomas Stevens, Ross Marchant, Gavin Coombes, Peter V. Ridd
Rok vydání:	2014
Předmět:	Mechanical Engineering Flow (psychology) Ocean current Ocean Engineering Geodesy Flow measurement Current meter symbols.namesake Tilt (optics) symbols Calibration Electrical and Electronic Engineering Current (fluid) Doppler effect Geology
Zdroj:	IEEE Journal of Oceanic Engineering. 39:2-9
ISSN:	1558-1691 0364-9059
DOI:	10.1109/joe.2012.2236151
Popis:	The high cost of acoustic Doppler ocean current meters means few are deployed in marine research studies. To address this problem, we have developed a low-cost robust current velocimeter based on the drag-tilt principle. The instrument tilts in response to current flow, for which the angle and direction of tilt are related to the water velocity. Static analytic approximation shows a sigmoid-type tilt response to increasing current speed. We detail a calibration method that models the relationship using a Gompertz curve. Calibration and field tests conducted near Magnetic Island, Australia, show a speed accuracy of 0.05 m/s for current speeds less than 0.6 m/s, and direction accuracy better than 15 ° for current speeds greater than 0.15 m/s. This instrument should be especially useful for research projects where numerous or spatially dense measurements of ocean currents are required.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::de251429d9eed143f8ef9782084ee1d0 https://doi.org/10.1109/joe.2012.2236151 Zobrazit plný text záznamu