scholarly journals On the Development of Focused Ultrasound Liquid Atomizers

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Ahmed M. Al-Jumaily ◽  
Ata Meshkinzar
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Focused Ultrasound ◽  
Low Cost ◽  
Industrial Applications ◽  
Ultrasonic Transducers ◽  
Central Channel

This paper reviews the evolution of focused ultrasonic transducers of various kinds for fluid atomization and vaporization. Ultrasonic transducers used for atomization purposes in biomedical, pharmaceutical, or industrial applications, such as surface acoustic wave (SAW) transducers, array of micromachined nozzles, and Fourier horn micromachined nozzles with or without a central channel, are all presented and compared. For simplicity of manufacturing and low cost, we focus on plates and curved and corrugated structures for biomedical humidification.

scholarly journals Perturbation Analysis of a Multiple Layer Guided Love Wave Sensor in a Viscoelastic Environment

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4533 ◽  
Author(s):  
Tao Wang ◽  
Ryan Murphy ◽  
Jing Wang ◽  
Shyam S. Mohapatra ◽  
Subhra Mohapatra ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Liquid Layer ◽  
Perturbation Analysis ◽  
Love Wave ◽  
Low Cost ◽  
Maxwell Model ◽  
Theoretical Models ◽  
Fast Response ◽  
Liquid Environment

Surface acoustic wave sensors have the advantage of fast response, low-cost, and wireless interfacing capability and they have been used in the medical analysis, material characterization, and other application fields that immerse the device under a liquid environment. The theoretical analysis of the single guided layer shear horizontal acoustic wave based on the perturbation theory has seen developments that span the past 20 years. However, multiple guided layer systems under a liquid environment have not been thoroughly analyzed by existing theoretical models. A dispersion equation previously derived from a system of three rigidly coupled elastic mass layers is extended and developed in this study with multiple guided layers to analyze how the liquid layer’s properties affect the device’s sensitivity. The combination of the multiple layers to optimize the sensitivity of an acoustic wave sensor is investigated in this study. The Maxwell model of viscoelasticity is applied to represent the liquid layer. A thorough analysis of the complex velocity due to the variations of the liquid layer’s properties and thickness is derived and discussed to optimize multilayer Surface acoustic wave (SAW) sensor design. Numerical simulation of the sensitivity with a liquid layer on top of two guided layers is investigated in this study as well. The parametric investigation was conducted by varying the thicknesses for the liquid layer and the guided layers. The effect of the liquid layer viscosity on the sensitivity of the design is also presented in this study. The two guided layer device can achieve higher sensitivity than the single guided layer counterpart in a liquid environment by optimizing the second guided layer thickness. This perturbation analysis is valuable for Love wave sensor optimization to detect the liquid biological samples and analytes.

Laser-based surface acoustic wave spectrometer for industrial applications

2003 ◽  
Vol 74 (1) ◽  
pp. 667-669 ◽  
Author(s):  
A. A. Maznev ◽  
Alex Mazurenko ◽  
Li Zhuoyun ◽  
Michael Gostein
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Industrial Applications ◽  
Wave Spectrometer

Passive Impedance-Loaded Surface Acoustic Wave (SAW) Sensor for Soil Condition Monitoring

2020 ◽  
Author(s):  
Jian Chu ◽  
Ioana Voiculescu ◽  
Ziqian Dong ◽  
Fang Li
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Condition Monitoring ◽  
Low Cost ◽  
Soil Condition ◽  
Nutrient Sensing ◽  
Soil Conditions ◽  
Large Area ◽  
Saw Sensor ◽  
Loaded Surface

Abstract This paper presents an innovative system to monitor the physical soil conditions needed for modern agriculture. The current technique to measure soil properties relies on taking samples from place to place and takes them for laboratory testing. To build up and monitor a data-based system for a large area, such a method is costly and time-consuming. This paper reported our recent work on the development of a passive impedance-loaded surface acoustic wave (SAW) sensor for a low-cost soil condition monitoring system. The SAW sensor will eventually be connected to an antenna and a impedance-based sensor for autonomous soil nutrient sensing. In this research, first, the coupling-of-modes (COM) analysis was performed to simulate the SAW device. The sensors were fabricated with E-beam lithography techniques and tested with different external load resistances. We investigated how the sensor signal changed with the external resistance loading. The experimental results were verified by comparing them with simulation results.

Application and Design of Surface Acoustic Wave Based Radio Frequency Identification Tags

2010 ◽  
pp. 97-112
Author(s):  
Han Tao ◽  
Shui Yongan
Keyword(s):  
Acoustic Wave ◽  
Radio Frequency ◽  
Surface Acoustic Wave ◽  
Time Domain ◽  
Radio Frequency Identification ◽  
Integrated Circuit ◽  
Low Cost ◽  
Fundamental Principle ◽  
Frequency Identification ◽  
Identification Tags

This chapter overviews a complementary technology to the integrated circuit based radio frequency identification (RFID)---- Surface Acoustic Wave (SAW) based RFID. The fundamental principle and applications of SAW RFID are presented. In order to guarantee the encoding capacity and reliable reading range, the design criteria in coding scheme, tag design and a time domain interrogated reader design are discussed in detail. As an example, a low-cost SAW RFID system applied in poultry farming management is introduced.

scholarly journals Portable Low-Cost Electronic Nose Based on Surface Acoustic Wave Sensors for the Detection of BTX Vapors in Air

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5406 ◽  
Author(s):  
Daniel Matatagui ◽  
Fabio Andrés Bahos ◽  
Isabel Gràcia ◽  
María del Carmen Horrillo
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Electronic Nose ◽  
Low Cost ◽  
Excellent Performance ◽  
Low Concentrations ◽  
Acoustic Wave Sensors ◽  
Benzene Toluene ◽  
Wave Sensors ◽  
First Time

A portable electronic nose based on surface acoustic wave (SAW) sensors is proposed in this work to detect toxic chemicals, which have a great potential to threaten the surrounding natural environment or adversely affect the health of people. We want to emphasize that ferrite nanoparticles, decorated (Au, Pt, Pd) and undecorated, have been used as sensitive coatings for the first time in these types of sensors. Furthermore, the proposed electronic nose incorporates signal conditioning and acquisition and transmission modules. The electronic nose was tested to low concentrations of benzene, toluene, and xylene, exhibiting excellent performance in terms of sensitivity, selectivity, and response time, indicating its potential as a monitoring system that can contribute to the detection of toxic compounds.

scholarly journals Fabrication of Low Cost Surface Acoustic Wave Sensors Using Direct Printing by Aerosol Inkjet

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 20907-20915 ◽  
Author(s):  
Marissa E. Morales-Rodriguez ◽  
Pooran C. Joshi ◽  
James R. Humphries ◽  
Peter L. Fuhr ◽  
Timothy J. Mcintyre
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Low Cost ◽  
Direct Printing ◽  
Acoustic Wave Sensors ◽  
Cost Surface ◽  
Wave Sensors

scholarly journals Miniaturized Hybrid Frequency Reader for Contactless Measurement Scenarios Using Resonant Surface Acoustic Wave Sensors

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2367
Author(s):  
Benedict Scheiner ◽  
Florian Probst ◽  
Fabian Michler ◽  
Robert Weigel ◽  
Alexander Koelpin ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Phase Measurement ◽  
Low Cost ◽  
Harsh Environments ◽  
Contactless Measurement ◽  
Torque Measurements ◽  
Acoustic Wave Sensors ◽  
Wear And Tear ◽  
Wave Sensors

Due to higher automation and predictive maintenance, it becomes more and more important to acquire as many data as possible during industrial processes. However, many scenarios require remote sensing since either moving parts would result in wear and tear of cables or harsh environments prevent a wired connection. In the last few years, resonant surface acoustic wave (SAW) sensors have promised the possibility to be interrogable wirelessly which showed very good results in first studies. Therefore, the sensor’s resonance frequency shifts due to a changed measurand and thus has to be determined. However, up to now frequency reader systems showed several drawbacks like high costs or insufficient accuracy that blocked the way for a widespread usage of this approach in the mass market. Hence, this article presents a miniaturized and low cost six-port based frequency reader for SAW resonators in the 2.45 GHz ISM band that does not require an external calculation unit. It is shown that it can be either used to evaluate the scenario or measure the frequency directly with an amplitude or phase measurement, respectively. The performance of the system, including the hardware and embedded software, is finally shown by wired and contactless torque measurements.

scholarly journals Modelling and Simulation using Finite Element Method of Surface Acoustic Wave Biosensor for Gas Detection Application

2021 ◽  
Vol 2071 (1) ◽  
pp. 012022
Author(s):  
A M Noor ◽  
A N Norali ◽  
Z Zakaria ◽  
M Mazalan ◽  
Y Wahab
Keyword(s):  
Numerical Simulation ◽  
Acoustic Wave ◽  
Resonance Frequency ◽  
Surface Acoustic Wave ◽  
High Frequency ◽  
Low Cost ◽  
Computational Modelling ◽  
Low Frequency ◽  
Gas Detection ◽  
Saw Sensor

Abstract A surface acoustic wave (SAW) sensor detects changes in physical properties such as mass and density on its surface. Compared to other types of sensors, SAW sensor have a good stability, high selectivity and sensitivity, fast response, and low-cost. On the other hand, to design and optimize a SAW biosensor requires a long process including time and cost using conventional methods. Therefore, numerical simulation and computational modelling are useful and efficiently conduct analysis for the SAW biosensor. In this paper, a numerical simulation technique is used to analyse the SAW device sensitivity for the application of gas detection. The SAW biosensor can detect very small mass loading by changing its sensor resonance frequency. The two-dimensional (2D) device model is based on a two-port SAW resonator with a gas sensing layer. We made two design of SAW biosensor device with frequency of 872 MHz and 1.74 GHz. A gas with vary concentration from 1 to 100 ppm were used to determine the change of the device resonance frequency. As a result, the high frequency (1.74 GHz) device, shows that the resonance frequency is shifted larger than to the low frequency (872 MHz) device. In addition, the high frequency device offers five times more sensitivity than the low frequency device. By changing the sensor design, the sensor characteristics such as sensitivity can be altered to meet certain sensing requirements. Numerical simulation provides advantages for sensor optimization and useful for nearly representing the real condition.

High Harmonic Surface Acoustic Wave Devices for Harsh Environment Sensor Applications

2013 ◽  
Vol 1519 ◽  
Author(s):  
J. Justice ◽  
M. Elbaz ◽  
L. E. Rodak ◽  
D. Korakakis
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Low Cost ◽  
High Harmonic ◽  
High Sensitivity ◽  
Harsh Environments ◽  
Device Performance ◽  
Quality Factors ◽  
Vehicle Exhaust ◽  
Saw Devices

ABSTRACTSurface acoustic wave (SAW) devices are ideal candidates for gas sensors due to their small size, low cost of production and high sensitivity. Increasing restrictions on pollution and emissions create the necessity for sensors that can operate in the harsh environments found in vehicle exhaust systems and industrial production. Gallium nitride (GaN) is a robust, chemically inert, piezoelectric semiconductor, making it an attractive material for SAW devices designed to detect and monitor gases in harsh environments. In this work, SAW devices designed to operate at the 5th and 7th harmonics are fabricated on GaN thin films and their performance is measured through insertion loss, signal to noise ratio, operating frequency and quality factor. Devices are directly exposed to the exhaust gas of a common diesel engine. Device performance is then re-measured and compared. SAW devices fabricated in this work have measured operating frequencies above 1 GHz, and quality factors up to and higher than 2000, depending on the harmonic mode. SAW devices on GaN showed good chemical stability and measured changes in device performance after exhaust exposure was negligible.

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