Erwin Reichel,
"Resonator sensors for fluid properties"
, in ISAT, Cobourg: 8th International Workshop on Novel Developments and Applications in Sensor and Actuator Technology, Serie Novel Developments and Applications in Sensor and Actuator Technology, Seite(n) 22, 9-2016
Original Titel:
Resonator sensors for fluid properties
Sprache des Titels:
Englisch
Original Buchtitel:
8th International Workshop on Novel Developments and Applications in Sensor and Actuator Technology
Original Kurzfassung:
Mechanical resonators in various vibration modes
and different excitation mechanisms are used as
sensors for measuring mass loading or fluid pro-
perties such as the viscosity and density. In this
presentation the focus is on devices with elec-
trodynamic excitation and readout with reso-
nance frequencies in the low kilohertz range. The
resonance frequency of the sensor is crucial for
measuring complex fluids with frequency depen-
dent linear viscoelastic properties. These proper-
ties are relevant in bodily fluids with a significant
content of polysaccharides, like hyaluronic acid in
synovia (joint liquid).
The electrodynamic excitation allows us to design
devices, e.g., of low resonance frequency and a
dominant acoustic shear-wave interaction with
the sample fluid. Our work consists of modeling
the frequency response as electrical equivalent
circuits of the coupled system, finite elements
analysis of the fluid-structure interaction, and lin-
king the two domains with reduced order impe-
dance models. We derived an expression for the
fluid impedance consisting of a set of device spe-
cific parameters describing the dependence on
viscosity and mass density. Under quite general
conditions, these parameters are only depending
on the vibrational mode shape and independent
of the fluid properties and frequency.
An efficient numerical computation of these para-
meters allows the tuning of the sensor geometry
to a specific range and sensitivity during the de-
sign step. Several examples of implemented sen-
sor devices are presented together with an evalu-
ation of the performance in realistic conditions.
Sprache der Kurzfassung:
Englisch
Serie:
Novel Developments and Applications in Sensor and Actuator Technology
Forschungs-