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Background Orientated Schlieren Method Applied for Liquid Systems of Strong Refractive Gradients

: Meinecke, M.; Kilzer, A.; Weidner, E.

Volltext ()

Chemie- Ingenieur- Technik 92 (2020), Nr.8, S.1089-1097
ISSN: 0009-286X
ISSN: 1522-2640
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer UMSICHT Oberhausen ()

A simple schlieren technique is used to visualize strong gradients of refractive index in liquids under atmospheric conditions and elevated pressure. The gradients are mainly caused by concentration differences within a thin liquid sheet. A simple system using Matlab and open source applications is designed and applied to demonstrate the challenges and limitations of a quantitative approach for strong gradients in liquids. Possibilities for the optimization regarding the detection of strong gradients are shown, but rather qualitative than quantitative results are obtained.