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Acoustic Wave Devices - DOAJ

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Last Updated: 03 May 2022

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Resonance Analysis of Piezoelectric Bulk Acoustic Wave Devices Based on YCOB Crystals with Monoclinic Symmetry Excited by Lateral Electric Fields

The monoclinic YCOB crystal also has good piezoelectric characteristics at 800 degrees C, indicating a promising application possibility in high-temperature piezoelectric wave sensors. The intriguing characteristics of piezoelectric plates based on monoclinic YCOB crystals are more difficult due to the lower symmetry in trigonal and tetragonal structures. The high-frequency vibrations of piezoelectric resonators made by a lateral electric field are modelled and analyzed in this paper, which are based on monoclinic YCOB crystal plates excited by a lateral electric field. The device's resonances and energy-trapping characteristics of the device are reproduced by the electrode width, electrode/plate mass ratio, and electrode gap value. In addition, the effects of the structure parameters on the mass sensitivity of the monoclinic YCOB LFE units are investigated, which are further verified by FEM simulations.

Source link: https://doi.org/10.3390/cryst12040542


Inkjet Printing of Plate Acoustic Wave Devices

The results of production of Ag inkjet printed interdigital transducers to the acoustic delay line based on the Y-cut X-propagation direction of lithium niobate plate for the frequency range from 1 to 14 MHz are included in the paper. Traditional inkjet printing has been shown to replace the complex photolithographic process used for manufacture of interdigital transducers for acoustic delay lines up to 14 MHz.

Source link: https://doi.org/10.3390/s20123349


Acoustophoretic Control of Microparticle Transport Using Dual-Wavelength Surface Acoustic Wave Devices

We present a numerical and experimental investigation of acoustophoretic modification in a microfluidic channel utilizing dual-wavelength standing surface acoustic waves to transport microparticles into different outlets. A singltablee target wavelength's SSAWs can be elicited by providing an RF voltage matched by the ratio of the SAW's velocity to the target IDT pitch. However, target SSAWs with identical wavelengths excite, less effectively, non-target SSAWs with the wavelength associated with the non-target pitch in comparison to target SSAWs by giving the target single-frequency RF voltage at a target SSAW. Variations of acoustic pressure fields created by dual-wavelength SSAWs led to variations in acoustic pressure fields as a result of particle motion, according to Simulated results. To determine zero-force positions and simulate particle movement trajectories, the acoustic radiation force in the acoustic pressure field was calculated.

Source link: https://doi.org/10.3390/mi10010052


Selective Detection of Hydrogen with Surface Acoustic Wave Devices Using Palladium Layer Properties

Surface acoustic wave sensors are designed for detecting gaseous hydrogen in standard environmental conditions, as shown in this paper. Two Rayleigh-wave delay lines manufactured on Quartz, one with a palladium coating and the other with a free path between the two interdigited transducers, consisting of two Rayleigh-wave delay lines built on Quartz, one with a palladium overlay and the other showing a free path between the two interdigited transducers. A specific gas test cell has been designed to analyze various sensor configurations in hydrogen-composed atmospheres. The developed device can be used to identify different amounts of hydrogen diluted in nitrogen and is also capable of detecting hydrogen in current atmosphere. Temperature and relative humidity variations on the sensor operation are also used to aid in the detection and analysis of hydrogen concentrations in the 1-4 percent range.

Source link: https://doaj.org/article/7fd0190f649142c0a1bffca4870f7416


Surface Acoustic Wave Devices for Harsh Environment Wireless Sensing

With the sensing layers studied here, resilient metal oxide films can be used as the oxygen sensing film, but the development of an adherent barrier layer will be required for the sensing layers and avoid contact with the langasite substrate. Experimental findings for the development of a langasite surface acoustic wave oxygen sensor with tin oxide sensing layer are shown, and these experimental findings are compared to direct measurements of layer resistance.

Source link: https://doi.org/10.3390/s130606910


The Characterization of Surface Acoustic Wave Devices Based on AlN-Metal Structures

In this paper, we discuss the development of surface acoustic wave resonators based on an AlN/titanium alloy structure. The AlN film thickness was in the range 1. 5 to 2. 5 m, with simulation results finding interdigital transducers with a regular length of 24 mm patterned by lift-off photolithography techniques on the AlN films/TC4 system, according to the simulation results, interdigital transducers with a regular length of 24 m were produced by lift-off photolithography methods on the AlN films/TC4 structure, based on the simulation results, with interdigital transducers with m The Q-factor and k2 were highly dependent on not only the normalized AlN film thickness but also the full width of AlN peak at half-maximum. The prepared SAW resonators, which are based on AlN/TC4's design, may be used in embedded micromechanical sensing devices.

Source link: https://doi.org/10.3390/s16040526


Experimental and Theoretical Study of Multifrequency Surface Acoustic Wave Devices in a Single Si/SiO 2 /ZnO Piezoelectric Structure

The propagation of surface acoustic waves along a ZnO/SiO 2 /Si piezoelectric unit has been experimentally and theoretically investigated. Six surface acoustic modes were experimentally tested in the 134 to 570 MHz frequency range, for acoustic wavelength = 30 m, and for SiO 2 and ZnO layers with a thickness of 1 and 2. 4 m. The velocity, the electroacoustic coupling coefficient, the geometry of the modes, the propagation loss, and the scattering coefficient S 21 of the SAW delay lines were determined by model propagation of these modes. Multiple excitation frequencies with different sensing characteristics can enable simultaneous analysis of the same gas with enhanced precision, according to a promising start for the development of a multiparameter sensing platform.

Source link: https://doi.org/10.3390/s20051380


Surface Effects and Challenges for Application of Piezoelectric Langasite Substrates in Surface Acoustic Wave Devices Caused by High Temperature Annealing under High Vacuum

Sensor devices that are used at high temperatures need substrate materials that are high-temperature stable. Therefore, annealing of bare LGS substrates at 800 C under high vacuum conditions is performed to determine whether this pretreatment improves the suitability and stability of this material for high temperature applications in vacuum. RuAl thin films are used to oxidize on LGs at high temperatures, and they are found to oxidize on LGs at high temperatures, helping to reveal the influence of the pretreatment on the later deposited metallization.

Source link: https://doi.org/10.3390/ma8125497

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

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* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions