Circuit for continuous monitoring of quartz-crystal resonators in sensor applications

2002 ◽  
Vol 38 (8) ◽  
pp. 365 ◽  
Author(s):  
A. Arnau ◽  
Y. Jiménez ◽  
T. Sogorb
Keyword(s):  
Continuous Monitoring ◽  
Quartz Crystal ◽  
Sensor Applications ◽  
Quartz Crystal Resonators

Electrical behaviour of AT-cut quartz crystal resonators as a function of overtone number

2010 ◽  
Vol 159 (2) ◽  
pp. 174-183 ◽  
Author(s):  
M. Cassiède ◽  
J.H. Paillol ◽  
J. Pauly ◽  
J.-L. Daridon
Keyword(s):  
Quartz Crystal ◽  
Electrical Behaviour ◽  
Quartz Crystal Resonators

scholarly journals Characterizing Vibrating Cantilevers for Liquid Viscosity and Density Sensing

2008 ◽  
Vol 2008 ◽  
pp. 1-9 ◽  
Author(s):  
Christian Riesch ◽  
Erwin K. Reichel ◽  
Franz Keplinger ◽  
Bernhard Jakoby
Keyword(s):  
Cross Sections ◽  
Quartz Crystal ◽  
Model Parameters ◽  
Additional Mass ◽  
Liquid Loading ◽  
Fitting Procedure ◽  
Saw Devices ◽  
Quartz Crystal Resonators ◽  
Macroscopic Parameters ◽  
Online Process

Miniaturized liquid sensors are essential devices in online process or condition monitoring. In case of viscosity and density sensing, microacoustic sensors such as quartz crystal resonators or SAW devices have proved particularly useful. However, these devices basically measure a thin-film viscosity, which is often not comparable to the macroscopic parameters probed by conventional viscometers. Miniaturized cantilever-based devices are interesting alternatives for such applications, but here the interaction between the liquid and the oscillating beam is more involved. In our contribution, we describe a measurement setup, which allows the investigation of this interaction for different beam cross-sections. We present an analytical model based on an approximation of the immersed cantilever as an oscillating sphere comprising the effective mass and the intrinsic damping of the cantilever and additional mass and damping due to the liquid loading. The model parameters are obtained from measurements with well-known sample liquids by a curve fitting procedure. Finally, we present the measurement of viscosity and density of an unknown sample liquid, demonstrating the feasibility of the model.

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