Acoustic loss phenomena in alpha quartz‐crystal resonators over the 1.4–77 K temperature range

1988 ◽  
Vol 63 (11) ◽  
pp. 5594-5595 ◽  
Author(s):  
J. J. Suter
Keyword(s):  
Quartz Crystal ◽  
Temperature Range ◽  
Acoustic Loss ◽  
Quartz Crystal Resonators

Modification of Point Defects in Quartz for Device Applications

1983 ◽  
Vol 24 ◽  
Author(s):  
J. C. King ◽  
D. R. Koehler
Keyword(s):  
Frequency Control ◽  
Defect Center ◽  
Ir Studies ◽  
Device Applications ◽  
Temperature Ranges ◽  
Radiation Induced ◽  
Impurity Centers ◽  
Acoustic Loss ◽  
Quartz Crystal Resonators ◽  
Hostile Environments

ABSTRACTImpurity centers in quartz play a significant role in the behavior of precision crystal resonators subjected to ionizing radiation. The substitutional Al center, charge compensated by Na, Li, H or a hole, is now known to be the primary contributing factor in most radiation-induced effects. Acoustic loss measurements, ESR measurements, optical studies and IR studies of these defects, over extended temperature ranges, have contributed substantially to our understanding of the impurity centers' role. Radiation-induced frequency and acoustic loss changes in quartz crystal resonators are now understood in terms of the evolving character of the defect center in a radiation field. This understanding has prompted material modification efforts such as high temperature electrolysis and doping technologies which permit, for instance, the fabrication of frequency control devices that are little affected by hostile environments.

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.

Vibration modes of mass‐loaded planoconvex quartz crystal resonators

1991 ◽  
Vol 90 (2) ◽  
pp. 700-706 ◽  
Author(s):  
Ewald Benes ◽  
Michael Schmid ◽  
Victor Kravchenko
Keyword(s):  
Quartz Crystal ◽  
Vibration Modes ◽  
Quartz Crystal Resonators
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