Schlieren visualisation and measurement of axisymmetric disturbances.

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dc.contributor.authorFlynn, M.R.
dc.contributor.authorOnu, K.
dc.contributor.authorSutherland, B. R.
dc.date.accessioned2025-05-01T12:23:10Z
dc.date.available2025-05-01T12:23:10Z
dc.date.issued2002
dc.descriptionAbstract. Synthetic schlieren is a new technique that allowsone easily and inexpensively to visualise density variations, such as those caused by internal waves propagating in a density stratified fluid. In the special case of twodimensional internal waves (for example, those created by an oscillating cylinder), synthetic schlieren allows one to measure non-intrusively the wave amplitudes everywhere in space and time. The technique works by measuring the apparent displacement of points in a digitised image (such as a grid of horizontal lines), which is observed by a CCD camera through the experimental test section. Synthetic schlieren is sufficiently sensitive that it can measure sub-pixel-scale disturbances. In this work, we report on the first step toward measuring fully three-dimensional disturbances. We perform laboratory experiments in which internal waves are generated in a uniformly salt-stratified fluid by a vertically oscillating sphere. Theory predicts that the resulting wave-field is in the form of two cones emanating above and below the sphere. Using inverse tomographic techniques, we exploit the axisymmetry of the wave-field to relate the apparent displacement of pixels in an image to the wave amplitudes.
dc.identifier.doihttps://doi.org/10.7939/R3SJ1B48P
dc.language.isoen
dc.relationdoi:10.5194/npg-10-303-2003
dc.relation.isversionofSutherland, B., Flynn, M., and Onu, K. (2002). Schlieren visualisation and measurement of axisymmetric disturbances.. Nonlin. Proc. Geophys., 10(3), 303-309.
dc.rightsAttribution-ShareALike 4.0 International
dc.subjectInternal waves
dc.subjectVisualise density variations
dc.subjectSynthetic schlieren
dc.titleSchlieren visualisation and measurement of axisymmetric disturbances.
dc.typehttp://purl.org/coar/resource_type/c_6501 http://purl.org/coar/version/c_970fb48d4fbd8a85
ual.jupiterAccesshttp://terms.library.ualberta.ca/public

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