Optical Multiphase Conductivity Inline Probe: Characterization and Analysis of Foam Structures

For inline process analysis of foams, a novel optical multiphase conductivity inline probe is presented, combining optical imaging and electrical conductivity measurements in a size‐adjustable volume. Telecentric illumination enables position‐independent detection of bubble structures, while gold‐plated electrodes determine local conductivity. This allows simultaneous determination of bubble size distribution and liquid phase fraction. Automated segmentation extracts foam structures for statistical analysis, while conductivity is correlated to liquid content based on the literature. Stirred tank experiments show strong agreement (mean absolute error 4.4%, 78% within the error band), demonstrating robust inline foam characterization under realistic conditions.