The interaction of a single travelling vortex ring with thin permeable screens of constant porosity is investigated. Molecular Tagging Velocimetry (MTV), a non-invasive flow field measurement technique, is used to quantify the velocity field. The resulting velocity field is remapped onto a regularly spaced grid and other flow properties, such as vorticity, are calculated. Vortex structures, including those formed in the interaction process, are tracked using the location of peak vorticity. The role of vortex shedding in the interaction process is investigated. The formation mechanism of the vorticity in the downstream vortex structure is found to be a function of boundary layer dynamics. This work extends and confirms the results of prior studies of the interaction.

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