5 May 2011 A liquid properties sensor utilizing pressure waves
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Miniaturized sensors for fluid viscosity often utilize shear vibrations and thus measure a thin film of fluid. To probe the bulk of a sample, pressure waves can be utilized instead. Then, however, the so-called longitudinal viscosity is determined, which can be equally useful for condition monitoring applications. Moreover, this parameter has not yet been investigated in detail such that material data are scarce. In this paper, we report on a prototype setup utilizing standing acoustic pressure waves in a small sample chamber. The impact of these resonances on the impedance of a PZT transducer is modeled and investigated experimentally. It is demonstrated that with this setup sound velocity and the longitudinal viscosity of liquid samples can be investigated.
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Hannes Antlinger, Hannes Antlinger, Roman Beigelbeck, Roman Beigelbeck, Stefan Clara, Stefan Clara, Samir Cerimovic, Samir Cerimovic, Franz Keplinger, Franz Keplinger, Bernhard Jakoby, Bernhard Jakoby, } "A liquid properties sensor utilizing pressure waves", Proc. SPIE 8066, Smart Sensors, Actuators, and MEMS V, 80661Z (5 May 2011); doi: 10.1117/12.886357; https://doi.org/10.1117/12.886357

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