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A few transient effects in AT-cut quartz thickness-shear resonators [Correspondence]

We study a few transient effects of AT-cut quartz thickness-shear resonators, including resonator turning on and turning off as well as voltage amplitude and frequency fluctuations. Mindlin??s two-dimensional plate equations are used and solved analytically. Both a sudden change and a gradual change of the driving voltage are studied. It is found that for a ......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141168  |  Date: 2011  |  FileSize: 488.11 KB

Temperature dependence of elastic properties and piezoelectric applications of BaTeMo2o9 single crystal [Correspondence]

BaTeMo2O9 (BTM) single crystal, as a lead-free piezoelectric material, belongs to the monoclinic system, space group P21. We report the temperature dependence of the elastic constants by the transmission method over the range -50°C to 150°C. The first-order temperature coefficients of the elastic constant s44 is ab......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141167  |  Date: 2011  |  FileSize: 552.52 KB

FEA modeling of CMUT with membrane stand-off structures to enable selectable frequency-mode operation

A selectable, dual-frequency, capacitive micromachined ultrasonic transducer (CMUT) designed for both high-frequency imaging and low-frequency therapeutic effect is presented. A validated finite element analysis (FEA) CMUT model was used to examine the performance of the proposed dual-frequency transducer. CMUT device simulations were used to design a hybrid......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141166  |  Date: 2011  |  FileSize: 275.08 KB

Characterization of an epoxy filler for piezocomposites compatible with microfabrication processes [Correspondence]

Miniature ultrasound transducer arrays that can operate at frequencies above 30 MHz are needed for high-resolution medical imaging. One way to achieve this is with a kerfless structure based on 1??3 connectivity piezocomposite with the electrodes defined by photolithography. To achieve this, not only does the composite need planar, parallel, and smooth surfa......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141165  |  Date: 2011  |  FileSize: 456.73 KB

A piezoelectric single-crystal ultrasonic microactuator for driving optics

At the millimeter scale, the motions or force outputs generated by conventional piezoelectric, magnetostrictive, photostrictive, or electromagnetic actuators are very limited. Here, we report a piezoelectric ultrasonic microactuator (size: 1.5 x 1.5 x 5 mm, weight: 0.1 g) made of PIN-PMN-PT single crystal. The actuator converts its high-frequency microscopic......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141164  |  Date: 2011  |  FileSize: 1.13 MB

Transverse waveguide mode suppression for Pt-electrode SAW resonators on Quartz and LGS

SAW resonators on ST-X quartz and langasite (LGS) [0°, 144°, 24°] are currently being used for hydrogen fluoride (HF) vapor sensing and high-temperature sensing, respectively. For these applications, the use of Pt-based electrodes allows the resonators to withstand the targeted harsh environments. This work reveals that for Pt-electrode resonators with conve......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141163  |  Date: 2011  |  FileSize: 964.23 KB

Three-dimensional variable-focus liquid lens using acoustic radiation force

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Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141162  |  Date: 2011  |  FileSize: 997.05 KB

Analyses of the temperature field of traveling-wave rotary ultrasonic motors

In this paper, the transient and steady-state temperature field of a traveling-wave rotary ultrasonic motor is analyzed by the finite element method, based on a theoretical model of power loss of this motor in rated operation. Using this model, the temperature field of this motor is calculated and the effects of the heat conductivity of friction material, mo......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141161  |  Date: 2011  |  FileSize: 1.58 MB

Broadband electrical impedance matching for piezoelectric ultrasound transducers

This paper presents a systematic method for designing broadband electrical impedance matching networks for piezoelectric ultrasound transducers. The design process involves three steps: 1) determine the equivalent circuit of the unmatched piezoelectric transducer based on its measured admittance; 2) design a set of impedance matching networks using a compute......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141160  |  Date: 2011  |  FileSize: 1000.25 KB

Shear-horizontal wave-based pipe damage inspection by arrays of segmented magnetostrictive patches

The lowest-branch torsional guided wave is very effective in pipe damage inspection because of its non-dispersive characteristics, but it cannot be used for the simultaneous identification of axial and circumferential locations of a defect in a pipe. Motivated by recent developments in magnetostrictive transducer technology, which is especially efficient in ......
Source:Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Article Nums: 6141159  |  Date: 2011  |  FileSize: 878.71 KB


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