Leaky Lamb waves in an acoustic cavity can be utilized for the measurement of temperature, density and sound velocity of an enclosed liquid. If the sensitivity of these variables to a change of predefined components in a liquid mixture is high enough, an online concentration measurement can be utilized as well. Gas bubbles can influence the measurable times-of-flight which can be disadvantageous for the concentration measurement. This paper will show how simultaneous group and phase velocity

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... surements can be used to calculate the sound velocity and the concentration in pure liquids, even if gas bubbles are interspersed.