• Citer

Demonstration and characterisation of a new interferometric particle imaging configuration for bubbles

par Dehaeck, Sam ;Van Beeck, Jeroen
Référence 13th International Symposium on Application of Laser Techniques to Fluid Mechanics
Publication Publié, 2006-06-26

Publication dans des actes

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

Extended ILIDS is introduced for measuring the diameter of bubbles under an angle close or equal to 90◦ with perpendicular polarisation. For this configuration two dominant frequency peaks are present in the power spectrum, which have a known frequency ratio. Since this signature is not easily reproduced by different scatterers, this configuration has an increased robustness compared to regular ILIDS. Additionally, this frequency signature was shown to be most sensitive to deviations from sphericity, making it a good detector of non-spherical bubbles. Apart from this, a detailed analysis of the different ILIDS calibration procedures revealed that the highest precision can be obtained with a two-step calibration procedure where the camera reaches focus half-way between the final ILIDS camera position and the measurement volume. Finally, measurements of the diameter of the same bubble were compared for three different techniques, i.e. backlighting,ILIDS and GPVS and these results differed by less than 1%.