J.
Leblond D.
Stepowski ABSTRACT This paper presents some non-intrusive techniques which cannot be considered as common tools for the characterization of two-phase flows, but have been successfully used in other application fields. Some methods based on microwave techniques, positron emission tomography and Nuclear Magnetic Resonance seem promising for dense media characterization, others based on incoherent interaction between laser radiation and molecules in vapour or condensed phases may apply to two-phase flows where radiations are reasonably well transmitted, i.e. turbidity is lower than unity.
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