Background oriented schlieren in a density stratified fluid

Lilly Verso*, Alex Liberzon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Non-intrusive quantitative fluid density measurement methods are essential in the stratified flow experiments. Digital imaging leads to synthetic schlieren methods in which the variations of the index of refraction are reconstructed computationally. In this study, an extension to one of these methods, called background oriented schlieren, is proposed. The extension enables an accurate reconstruction of the density field in stratified liquid experiments. Typically, the experiments are performed by the light source, background pattern, and the camera positioned on the opposite sides of a transparent vessel. The multimedia imaging through air-glass-water-glass-air leads to an additional aberration that destroys the reconstruction. A two-step calibration and image remapping transform are the key components that correct the images through the stratified media and provide a non-intrusive full-field density measurements of transparent liquids.

Original languageEnglish
Article number103705
JournalReview of Scientific Instruments
Volume86
Issue number10
DOIs
StatePublished - 1 Oct 2015

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