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A calibrated, non-invasive method for measuring the internal interface height field at high resolution in the rotating, two-layer annulus

Williams, P. D., Read, P.L. and Haine, T.W.N. (2004) A calibrated, non-invasive method for measuring the internal interface height field at high resolution in the rotating, two-layer annulus. Geophysical & Astrophysical Fluid Dynamics, 98 (6). pp. 453-471. ISSN 0309-1929

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To link to this article DOI: 10.1080/03091920412331296366

Abstract/Summary

We describe a remote sensing method for measuring the internal interface height field in a rotating, two-layer annulus laboratory experiment. The method is non-invasive, avoiding the possibility of an interaction between the flow and the measurement device. The height fields retrieved are accurate and highly resolved in both space and time. The technique is based on a flow visualization method developed by previous workers, and relies upon the optical rotation properties of the working liquids. The previous methods returned only qualitative interface maps, however. In the present study, a technique is developed for deriving quantitative maps by calibrating height against the colour fields registered by a camera which views the flow from above. We use a layer-wise torque balance analysis to determine the equilibrium interface height field analytically, in order to derive the calibration curves. With the current system, viewing an annulus of outer radius 125 mm and depth 250 mm from a distance of 2 m, the inferred height fields have horizontal, vertical and temporal resolutions of up to 0.2 mm, 1 mm and 0.04 s, respectively.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:1920
Uncontrolled Keywords:Two-layer annulus; Interface height; Optical activity; Torque balance; Calibration
Publisher:Taylor & Francis Ltd

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