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Numerical Investigation of the Propagation Characteristics of Surface Transverse Wave Considering Various Quartz Substrate and Electrode Configurations

Jiang Chao, Cao Xiaoli, Yang Feng, Liu Zejun

Archives of Acoustics

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2023

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Vol. 48, No. 3

403--412

EN

Featured with a higher velocity, increased power handling capability, and better aging behavior, surface transverse wave (STW) shows more promising prospects than Rayleigh wave nowadays in various sensing applications. The need to design, optimize, and fabricate the related devices motivates the development of modeling and simulation. For this reason, a three-dimensional (3D) finite element (FE) simulation of STW on quartz, considering the crystal cut angle and the electrode effects, is presented in this study. Firstly, we investigated the effects of quartz’s cut angle on the generated waves. Here, the polarized displacements were analyzed to distinguish the wave modes. Secondly, the investigations of the electrode effects on the polarized displacement, phase velocity, and electromechanical coupling factor (K2) were carried out, for which different material and thickness configurations for the electrodes were considered. Thirdly, to examine the excitation conditions of the generated waves, the admittance responses were inspected. The results showed that not only the crystal cut angle but also the density and the acoustic impedance of the interdigital transducer (IDT) material have a strong influence on the excited waves. This article is the first to analyze STWs considering quartz’s cut angle and electrode effect through a 3D FE model. It could provide a helpful and easy way to design, optimize, and fabricate the related surface acoustic wave devices.

2

Wybrane metody pomiarowe parametrów linii opóźniających z akustyczną falą powierzchniową

Borowik P.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 2

92--95

PL

W artykule przedstawiono metody pomiarowe parametrów linii opóźniających z akustyczną falą powierzchniową (AFP). Do badań wykorzystano linie opóźniającą do czujników drgań z AFP. W każdej z metod przedstawiono wyniki badań eksperymentalnych tych samych linii. Porównano te metody oraz uzyskane wyniki badań.

EN

The article presents methods of measuring parameters of delay lines with acoustic surface wave (ASW). The study used delay lines for AFP vibration sensors. Each method presents the results of experimental studies of the same lines. These methods were compared and the results obtained were compared.

3

Wykorzystanie zjawiska powierzchniowej fali akustycznej w aplikacjach systemów mikroprzepływowych – przegląd rozwiązań

Nowek A.

Materiały Elektroniczne

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2013

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T. 41, nr 4

27--33

PL

W artykule dokonano przeglądu najbardziej interesujących rozwiązań z zakresu systemów mikroprzepływowychwykorzystujących zjawisko akustycznych fal powierzchniowych (AFP). Przemieszczanie obiektów o skali wielkości porównywalnej z rozmiarami komórek, oddzielenie ich z próbek o złożonym składzie oraz kontrola ich położenia w obszarze mikrosystemu są ważnym elementem metodyki badawczej w zakresie biomedycznych badań podstawowych. Jest to obecnie bardzo dynamicznie rozwijająca się dziedzina, która jest szczególnie cenna w aspekcie aplikacji w systemach Lab on Chip, gdzie możliwość nieinwazyjnego manipulowania obiektem badań jest szczególnie pożądana. Zastosowania, które są obecnie przedmiotem badań obejmują zagadnienia z zakresu segregowania cząstek z zawiesiny w cieczy, ich oddzielania oraz manipulowania pojedynczymi cząstkami w obszarze mikrokanału.

EN

In this paper the most interesting solutions in the field of microfluidic systems using surface acoustic waves (SAW) are reviewed. Moving objects, of a size scale comparable to the size of cells, their separation from the samples having a complex composition and control of their position in the area of a microchannel, constitute an important element of the methodology of biomedical basic research. Nowadays it has become a rapidly growing branch of science, which is particularly attractive in terms of its applicability to Lab on Chip systems, in the case of which the non-invasive manipulation of the studied object is a key issue. The applications that are currently examined include problems related to the separation of particles from a suspension in a liquid and the manipulation of individual particles in the area of a microchannel.

4

Solution of some problems of single-scale wavelet transform processor using a magnetostatic surface wave device

Lu W., Kuang L., Lü X., Zhu C., Zhang T., Zhang J.

Metrology and Measurement Systems

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2012

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Vol. 19, nr 4

685-692

EN

In this paper, we investigate the implementation schemes of a single-scale wavelet transform processor using magnetostatic surface wave (MSSW) devices. There are three implementation schemes: the interdigital transducer, the meander line transducer and the grating transducer. Because the interdigital transducer has excellent properties, namely, good frequency characteristic and low insertion loss, we use the interdigital transducer as the implementation scheme of a single-scale wavelet transform processor using MSSW device. In the paper, we also present the solutions to the three key problems: the direct coupling between the input transducer and the output transducer, the insertion loss, and the loss characteristics of the gyromagnetic film having an influence on the wavelet transform processor. There are two methods of reducing the direct coupling between the input transducer and the output transducer: increasing the distance between the input transducer and the output transducer, and placing a metal "wall" between the input transducer and the output transducer. There also are two methods of reducing the insertion loss of a single-scale wavelet transform processor using a MSSW device for scale: the appropriate thickness of the yttrium iron garnet (YIG) film and the uniform magnetic field. The smaller the ferromagnetic resonance linewidth of the gyromagnetic film, the smaller the magnetostatic wave propagation loss.

5

Interdigital transducers for lamb-wave based SHM systems: design and sensitivity analysis

Mańka M., Rosiek M., Martowicz A., Uhl T.

Mechanics and Control

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2011

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Vol. 30, no. 2

79-84

EN

Structural health monitoring (SHM) systems have been constantly improved in the past decades. Sensors for SHM should be built-in to perform continuous measurements in opposite to non-destructive testing (NDT), in case of which sensors have to be mounted on the structure only during measurements. One of the most promising type of the transducers dedicated for SHM systems is Interdigital Transducer (IDT), which is designed for ultrasonic Lamb wave monitoring. Mode selectivity, high excitation strength, wave directivity, small size and relatively low cost are the most important advantages of the IDT. In the paper a designing process of the IDT is presented. Then, the results of numerical simulations and sensitivity analysis are discussed for exemplary IDT configuration.

PL

Systemy monitorowania stanu konstrukcji (SHM) w ostatnich latach są dynamicznie rozwijane. Przetworniki wykorzystywane w tego typu systemach są na stałe montowane na badanej konstrukcji pozwalając na ciągły pomiar zmian jest stanu. Jednym z przetworników stosowanych w systemach SHM bazujących na powierzchniowych falach ultradźwiękowych są przetworniki międzypalczaste (IDT). Ich głównymi zaletami są małe rozmiary oraz zdolność do generowania wąskopasmowej fali kierunkowej o stosunkowo wysokiej amplitudzie. W artykule przedstawiony został proces projektowania przetworników IDT. Omówiono wyniki przeprowadzonych symulacji oraz procesu analizy wrażliwości dla przedstawionej konstrukcji.

6

Methods of IDT charge spatial spectrum evaluation

Tasinkevych Y.

Journal of Technical Physics

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2004

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Vol. 45, no 2

155-172

EN

Interdigital transducers (IDTs) have found numerous applications in electronic devices for excitation and detection of surface acoustic waves (SAWs). This paper discusses the methods of solution of the electrostatic problem arising in modelling of the IDT most important characteristic - its frequency response. Numerical results are presented based on the so-called spectral approach. Computation difficulties are discussed and their solutions are proposed.