Abstract. An optical probe measuring interfacial area (F) by light attenuation has been designed with a special emphasis on flows with sub-millimetric particles. It permits measurements in liquidliquid or gas-liquid dispersions without need of introducing empirical correcting factors for the standard exponential decay law of light intensity while keeping an extended application range. This probe was successfully tested with an air-glass particle flow, the parameters of which were carefully determined basically by hold-up methods. The volume fraction of the dispersed phase was varied between 0.05% and 5%, and the particle size between 10 ~tm and 300 p.m.
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