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Sensors (Basel). 2019 May 21;19(10). pii: E2336. doi: 10.3390/s19102336.

Fluid Sensing Using Quartz Tuning Forks-Measurement Technology and Applications.

Author information

1
Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria. thomas.voglhuber@jku.at.
2
Micro Resonant OG, 4020 Linz, Austria. a.niedermayer@micro-resonant.at.
3
Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria. friedrich.feichtinger@jku.at.
4
Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria. Bernhard.jakoby@jku.at.

Abstract

We provide an overview of recent achievements using quartz tuning forks for sensing liquid viscosity and density. The benefits of using quartz crystal tuning forks (QTFs) over other sensors are discussed on the basis of physical arguments and issues arising in real world applications. The path to highly accurate and robust measurement systems is described and a recently devised system considering these findings is presented. The performance of the system is analyzed for applications such as the mixing ratio measurement of fuels, diesel-soot contamination for engine oil condition monitoring, and particle size characterization in suspensions. It is concluded that using properly designed systems enables a variety of applications in industry and research.

KEYWORDS:

condition monitoring; density; measurement instrument; viscosity

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