Dissertations / Theses on the topic 'Acoustic Wave Sensors'
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Evans, Carl Richard. "Layer guided acoustic wave sensors." Thesis, Nottingham Trent University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442338.
Full textFabrice, Martin. "Layer guided shear acoustic wave sensors." Thesis, Nottingham Trent University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251224.
Full textKaplan, Emrah. "Surface acoustic wave enhanced electroanalytical sensors." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6557/.
Full textAtherton, S. "Semen quality detection using acoustic wave sensors." Thesis, Nottingham Trent University, 2011. http://irep.ntu.ac.uk/id/eprint/233/.
Full textFriedlander, Jeffrey B. "Wireless Strain Measurement with Surface Acoustic Wave Sensors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306874020.
Full textSrinivasan, krishnan. "Nanomaterial sensing layer based surface acoustic wave hydrogen sensors." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001325.
Full textSrinivasan, Krishnan. "Nanomaterial Sensing Layer Based Surface Acoustic Wave Hydrogen Sensors." Scholar Commons, 2005. https://scholarcommons.usf.edu/etd/873.
Full textFisher, Brian. "Surface Acoustic Wave (SAW) Cryogenic Liquid and Hydrogen Gas Sensors." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5208.
Full textPh.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Sabkha, Aimen. "Implantable Wireless Surface Acoustic Wave Sensors for Blood Pressure Measurement." Thesis, Oxford Brookes University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491086.
Full textDeng, Zhiping. "Acoustic wave sensors for aroma components using conducting polymer films." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0017/NQ27632.pdf.
Full textSerrano, Diego Emilio. "Integrated inertial measurement units using silicon bulk-acoustic wave gyroscopes." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54283.
Full textWestafer, Ryan S. "Investigation of phononic crystals for dispersive surface acoustic wave ozone sensors." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41165.
Full textThiele, Jeremy Allan. "High Temperature LGX Acoustic Wave Devices and Application for Gas Sensors." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/ThieleJA2005.pdf.
Full textWang, Tao. "Optimization and Characterization of Integrated Microfluidic Surface Acoustic Wave Sensors and Transducers." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6153.
Full textMan, Gabriel. "Towards all-polymer surface acoustic wave chemical sensors for air quality monitoring." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17469.
Full textChaudhari, Amol V. "Development of Surface Acoustic Wave Sensors Using Nanostructured Palladium for Hydrogen Detection." Scholar Commons, 2004. https://scholarcommons.usf.edu/etd/989.
Full textHe, Jiaji. "Acoustic Waveguides and Sensors for High Temperature and Gamma Radiation Environment." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101870.
Full textDoctor of Philosophy
Sensing in harsh environments, like high temperature, high pressure, and corrosive environment, is always in great need. Efficient and safe operation of instruments like nuclear reactors could be better secured. Although many sensors and sensing systems are reported, such as optical fiber sensors and acoustic sensors, they all have drawbacks so new designs are constantly in need.newline In this dissertation, silica (a glass commonly acquired by melting sand) and sapphire (used in iphone screens due to its transparency and hardness) acoustic waveguides and sensors are developed. A periodic structure known as acoustic fiber Bragg grating (AFBG) is the core sensor structure in this dissertation. A calculation method is proposed first. Acoustic wave needs a waveguide to propagate somewhere further, and a new waveguide structure is made to keep the acoustic energy within the very center of the waveguide, so any change on the outer surface does not affect the wave inside. Also, sapphire has good acoustic property and is used. The AFBGs are fabricated in both waveguides. These sensing waveguides are shown to work at >1000 C temperature and provide stable reading for more than 10 days. Long term exposure to gamma radiation for weeks or months resulted in stable performances. Therefore, it is concluded that silica and sapphire waveguide sensors are successfully developed for high temperature and nuclear radiation applications.
Fechete, Alexandru Constantin, and e54372@ems rmit edu au. "Layered Surface Acoustic Wave Based Gas Sensors Utilising Nanostructured Indium Oxide Thin Layer." RMIT University. Electrical and Computer Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091105.141111.
Full textOnen, Onursal. "Analytical Modeling, Perturbation Analysis and Experimental Characterization of Guided Surface Acoustic Wave Sensors." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4555.
Full textLee, Sang Hun. "Theoretical and Experimental Characterization of Time-Dependent Signatures of Acoustic Wave Based Biosensors." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11631.
Full textMatthews, Glenn Ian, and gimatthews@ieee org. "Investigation of Flexural Plate Wave Devices for Sensing Applications in Liquid Media." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090219.120815.
Full textStubbs, Desmond Dion. "Development of an Acoustic Wave Based Biosensor for Vapor Phase Detection of Small Molecules." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10412.
Full textSankaranarayanan, Subramanian K. R. S. "Design of surface acoustic wave sensors with nanomaterial sensing layers : application to chemical and biosensing." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002245.
Full textCortes, Correales Daniel H. "Elastic guided wave dispersion in layered piezoelectric plates application to ultrasound transducers and acoustic sensors /." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10206.
Full textTitle from document title page. Document formatted into pages; contains vi, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-84).
Wathen, Adam Daniel. "Acoustic wave biosensor arrays for the simultaneous detection of multiple cancer biomarkers." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42717.
Full textGaudron, J. O. "Design and characterisation of long period grating (LPG)-based optical fibre sensors for acoustic wave detection." Thesis, City University London, 2015. http://openaccess.city.ac.uk/8340/.
Full textCular, Stefan. "Designs and applications of surface acoustic wave sensors for biological and chemical sensing and sample handling." [Tampa, Fla.] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002335.
Full textGreco, Gina. "Surface acoustic wave (SAW) technology for microfluidic lab-on-chips (LoCs) and biosensors." Doctoral thesis, Scuola Normale Superiore, 2019. http://hdl.handle.net/11384/85929.
Full textPuccio, Derek. "DESIGN, ANALYSIS AND IMPLEMENTATION OF ORTHOGONAL FREQUENCY CODING IN SAW DEVICES USED FOR SPREAD SPECTRUM TAGS AND SENSORS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2836.
Full textPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Campanella, Pineda Humberto. "Thin-film bulk acoustic wave resonators (FBAR) : fabrication, heterogeneous integration with CMOS technologies and sensor applications." Doctoral thesis, Universitat Autònoma de Barcelona, 2008. http://hdl.handle.net/10803/5357.
Full textEl desarrollo de la tecnología de fabricación de los FBAR ha involucrado la puesta a punto de las técnicas de depósito y micro-mecanización de la estructura en capas del resonador, la cual está comprendida por una película de material acústico hecha de nitruro de aluminio (AlN). Se realizaron diversas pruebas para analizar la calidad del AlN depositado. También se probaron y pusieron a punto diferentes tecnologías de micro¬mecanización para liberar la estructura del FBAR, destacando entre ellas la técnica de ataque en seco por la cara de componentes, dados los altos factores de calidad obtenidos (superiores a 2.000 a 2,4 GHz). Sobre los dispositivos fabricados se realizaron caracterizaciones estructurales, modelos utilizando análisis de elementos finitos y la extracción de parámetros de circuito equivalente. Una variación del proceso que involucraba el diseño, modelado y fabricación de un dispositivo FBAR con compensación de temperatura fue igualmente desarrollada. En este ámbito vale la pena resaltar la concepción y realización de una novedosa técnica post-fabricación para el ajuste fino de la frecuencia de resonancia de los FBAR por medio de un haz de iones focalizados (FIB).
Basado en la tecnología arriba mencionada, se desarrolló un método de integración heterogénea a nivel de oblea de los dispositivos FBAR en sustratos CMOS estándar. De acuerdo con este método, se logró fabricar por primera vez dispositivos FBAR flotando sobre sustratos CMOS estándar. Este método ha sido exitosamente demostrado por medio de la integración de los FBAR tanto con la tecnología comercial AMS035 como con la CNM25, desarrollada en el CNM-IMB (CSIC).
En el terreno de las aplicaciones, se diseñaron y realizaron diferentes aplicaciones de sensores basadas en FBAR, siendo el detector de masas localizadas la más relevante de entre ellas. Es de anotar que esta aplicación fue demostrada por primera vez utilizando FBARs de alta frecuencia como elemento sensor. De tal forma, se contrastaron los resultados experimentales y de modelado del sensor. Por otra parte, se presenta también el concepto de sensores mecánicos basados en FBAR. Para ello se han desarrollado dos ejemplos: el acelerómetro basado en FBAR y el sensor de fuerza para aplicaciones de puntas de AFM. Se reporta también en esta tesis la fabricación y caracterización de un nuevo tipo de resonadores acústicos de AlN sin contacto entre electrodos.
The high impact of FBAR on radio-frequency and, most recently, on sensing systems has motivated the development of integrated applications. This means that the fabrication process should succeed in producing high-quality-factor resonators and, at the same time, in integrating FBARs with standard CMOS technologies. Hence, this Ph.D. thesis addresses these requirements by contributing with the design, fabrication and characterization of thin-film bulk acoustic wave resonators (FBAR); their integration with standard complementary-metal-oxide-semiconductor (CMOS) technologies; and their application to sensing systems.
The development of the FBAR's fabrication technology has involved the set up of the deposition and micromachining techniques of the layered structure of the resonator, which comprises an acoustic layer made of aluminum nitride (AlN). Several tests on the deposition and characterization of the AlN quality were carried out. Also, different micro-machining technologies for FBAR releasing were tested, the front-side micro-machining technique having obtained the best quality-factor results (over 2,000 at 2.4 GHz). Structural and device experimental characterization; and equivalent-circuit parameter and finite-element modeling of the FBAR were carried out. A process variation involving the design, modeling and fabrication of a temperature-compensated (TC) FBAR device was also implemented. Another remarkable result is the implementation of a post-fabrication, focused-ion-beam assisted technique for tuning of the resonance frequency of the FBAR.
Based on the foregoing-mentioned FBAR technology, a method for performing wafer-level heterogeneous integration of the FBAR with a CMOS substrate was developed. According to this method, the fabrication of a floating FBAR above standard CMOS substrates has been achieved for the first time. The method was demonstrated by integrating FBARs on the commercial AMS035 and the in-house CNM25 CMOS technologies.
On the application side, different FBAR-based sensor applications were implemented, the localized-mass detector being the most relevant, which has been demonstrated for the first time for high-frequency bulk-acoustic resonators. Experimental and modeling results have been contrasted. Also, the concept of FBAR-based mechanical sensor has been introduced. Two examples are the embedded-FBAR accelerometer and the force sensor for AFM-cantilever applications. The fabrication and characterization results of an AlN-based contactless acoustic resonator are also reported in this thesis.
Lu, Donghang [Verfasser], Rolf [Akademischer Betreuer] Jakoby, and Mario [Akademischer Betreuer] Kupnik. "Dual-load Hybrid Detection of Water Content Using Electromagnetic and Surface Acoustic Wave Sensors / Donghang Lu ; Rolf Jakoby, Mario Kupnik." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1121206972/34.
Full textGarcía, Narbón José Vicente. "Improved characterization systems for quartz crystal microbalance sensors: parallel capacitance compensation for variable damping conditions and integrated platform for high frequency sensors in high resolution applications." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63249.
Full text[ES] Durante las dos últimas décadas se han propuesto diferentes interfaces electrónicos para medir los parámetros más importantes de caracterización de los cristales de microbalanza de cuarzo (QCM). La medida de los parámetros adecuados del sensor para una aplicación específica es muy importante, ya que un error en la medida de dichos parámetros puede resultar en un error en la interpretación de los resultados. Los requerimientos del sistema de caracterización dependen de la aplicación. En esta tesis se proponen dos sistemas de caracterización para dos ámbitos de aplicación que comprenden la mayoría de las aplicaciones con sensores QCM: 1) Caracterización de materiales bajo condiciones de amortiguamiento variable y 2) detección de sustancias con alta resolución de medida. Los sistemas propuestos tratan de resolver la problemática detectada en los ya existentes. Para aplicaciones en las que el amortiguamiento del sensor varía durante el experimento, se propone un sistema basado en una nueva configuración de la técnica de compensación automática de capacidad (ACC). La nueva configuración proporciona la medida de la frecuencia de resonancia serie, la resistencia dinámica y la capacidad paralelo del sensor. Además, permite una fácil calibración del sistema que mejora la precisión en la medida. Se presentan resultados experimentales para cristales de 9 y 10MHz en medios fluidos, con diferentes capacidades en paralelo, demostrando la efectividad de la compensación de capacidad. El sistema presenta alguna desviación en frecuencia con respecto a la frecuencia resonancia serie, medida con un analizador de impedancias. Estas desviaciones son explicadas convenientemente, debidas al comportamiento no ideal específico de algunoscomponentes del circuito. Una nueva propuesta de circuito se presenta como posible solución a este problema. Para aplicaciones de alta resolución se propone una plataforma integrada para caracterizar sensores acústicos de alta frecuencia. El sistema propuesto se basa en un nuevo concepto en el que el sensor es interrogado, mediante una fuente externa muy estable y de muy bajo ruido, a una frecuencia constante mientras se monitorizan los cambios producidos por la carga en la fase del sensor. El uso de sensores de alta frecuencia aumenta la sensibilidad de la medida, por otro lado, el sistema de caracterización diseñado reduce el ruido en la misma. El resultado es una mejora del límite de detección (LOD). Se consigue con ello uno de los retos pendientes en los dispositivos acústicos de alta frecuencia. La validación de la plataforma desarrollada se realiza con una aplicación de un inmunosensor basado en cristales QCM de alta frecuencia fundamental (HFF-QCM) para la detección de dos pesticidas: carbaryl y tiabendazol. Los resultados obtenidos para el Carbaryl se comparan con los obtenidos con otra tecnología acústica de alta frecuencia basada en sensores Love, con la técnica óptica basada resonancia superficial de plasmones (SPR) y con la técnica de referencia Enzyme Linked Immuno Assay (ELISA). El LOD obtenido con los sensores acústicos HFFQCM y Love es similar al obtenido con las técnicas ELISA y mejora en un orden de magnitud al obtenido con SPR. La sencillez conceptual del sistema propuesto junto con su bajo coste, así como la capacidad de miniaturización del resonador de cuarzo hace posible la caracterización de múltiples sensores integrados en una configuración en array, esto permitirá en un futuro alcanzar el reto de la detección multianalito para aplicaciones High-Throughput Screening (HTS).
[CAT] Durant les dues últimes dècades s'han proposat diferents interfases electrònics per a mesurar els paràmetres més importants de caracterització dels cristalls de microbalança de quars (QCM). La mesura dels paràmetres adequats del sensor per a una aplicació específica és molt important, perquè un error en la interpretació dels resultats pot resultar en un error en la interpretació dels resultats. Els requeriments del sistema de caracterització depenen de l'aplicació. En aquesta tesi, es proposen dos sistemes de caracterització per a dos àmbits d'aplicació que comprenen la majoria de les aplicacions amb sensors QCM: 1) Caracterització de materials sota condicions d'amortiment variable i 2) detecció de substàncies amb alta resolució de mesura. Els sistemes proposats tracten de resoldre la problemàtica detectada en els ja existents. Per a aplicacions en les quals l'amortiment del sensor varia durant l'experiment, es proposa un sistema basat en una nova configuració de la tècnica de compensació automàtica de capacitat (ACC). La nova configuració proporciona la mesura de la freqüència de ressonància sèrie, la resistència dinàmica i la capacitat paral¿lel del sensor. A més, permet un calibratge fàcil del sistema que millora la precisió de la mesura. Es presenten els resultats experimentals per a cristalls de 9 i 10 MHz en mitjans fluids, amb diferents capacitats en paral¿lel, demostrant l'efectivitat de la compensació de capacitat. El sistema presenta alguna desviació en freqüència respecte a la freqüència ressonància sèrie, mesurada amb un analitzador d'impedàncies. Aquestes desviacions són explicades convenientment, degudes al comportament no ideal específic d'alguns components del circuit. Una nova proposta de circuit es presenta com a possible solució a aquest problema. Per a aplicacions d'alta resolució es proposa una plataforma integrada per a caracteritzar sensors acústics d'alta freqüència. El sistema proposat es basa en un nou concepte en el qual el sensor és interrogat mitjançant una font externa molt estable i de molt baix soroll, a una freqüència constant mentre es monitoritzen els canvis produïts per la càrrega en la fase del sensor. L'ús de sensors d'alta freqüència augmenta la sensibilitat de la mesura, per altra banda, el sistema de caracterització dissenyat redueix el soroll en la mateixa. El resultat és una millora en el límit de detecció (LOD). S'aconsegueix amb això un dels reptes pendents en els dispositius acústics d'alta freqüència. La validació de la plataforma desenvolupada es realitza amb una aplicació d'un immunosensor basat en cristalls QCM d'alta freqüència fonamental (HFF-QCM) per a la detecció de dos pesticides: carbaryl i tiabendazol. Els resultats obtinguts per al carbaryl es comparen amb els obtinguts amb altra tecnologia acústica d'alta freqüència basada en sensors Love, amb la tècnica òptica basada en ressonància superficial de plasmons (SPR) i amb la tècnica de referència Enzyme Linked Immuno Assay (ELISA). El LOD obtingut amb els sensors acústics HFF-QCM i Love és similar al obtingut amb les tècniques ELISA i millora en un ordre de magnitud el obtingut amb SPR. La senzillesa conceptual del sistema proposat junt amb el seu baix cost, així com la capacitat de miniaturització del ressonador de quars fa possible la caracterització de múltiples sensors integrats en una configuració en array, el que permetrà en un futur assolir el repte de la detecció multianalit per a aplicacions High-Throughput Screening (HTS).
García Narbón, JV. (2016). Improved characterization systems for quartz crystal microbalance sensors: parallel capacitance compensation for variable damping conditions and integrated platform for high frequency sensors in high resolution applications [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/63249
TESIS
Law, Yiu Kui. "Design and Testing of Off-The-Shelf Electronic Components for an Acoustic Emission Structural Health Monitoring System Using Piezoelectric Sensors." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34477.
Full textMaster of Science
Maxwell, Andrew Douglas. "A CO2 measurement system for low-cost applications using chemical transduction." University of Southern Queensland, Faculty of Engineering and Surveying, 2002. http://eprints.usq.edu.au/archive/00001468/.
Full textPolewczyk, Vincent. "Growth of hybrid piezoelectric/magnetostrictive systems for magnetic devices based on surface acoustic wave resonators." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0096/document.
Full textThe development of materials with different coupled ferroic orders (multiferroics) drives an intense research activity. A particularly interesting combination is the case where magnetic and electrical orders are simultaneously present, which, in the favorable case where these are coupled, opens the way to the electrical control of magnetization. This can be achieved in manipulating the polarization in a ferroelectric or the strains in a piezoelectric compound. Ferroelectric or piezoelectric properties can inversely be influenced by the magnetic state, an interesting feature for the development of magnetic field sensors. This work aims in the investigation of piezoelectric/magnetostrictive systems, more especially in the role of the magnetization and of the magnetization versus field behavior on the surface acoustic waves (SAW). Polycristalline Ni films, [Co/IrMn] multilayers and epitaxial TbFe2 films have been deposited on Lithium Niobate (LNO) substrates of different orientations. On LNO Z-cut, various single or double buffer layers have been used to achieve the TbFe2 epitaxial growth, along either [111] or [110] directions and with either perpendicular or in-plane magnetic anisotropy. On LNO 128Y and 41Y substrates, the growth is more complex but it is nevertheless possible to obtain crystalline multidomains TbFe2 films with 3D orientation relationships similar to those obtained on LNO Z-cut, both between the magnetic and the buffer layers, and between the buffer layer and the substrate. Magnetic surface acoustic wave (MSAW) devices have been patterned in a resonator geometry that enables an easy wireless interrogation. The MSAW device resonance frequency is sensitive to an external magnetic field, both via static effects related to the field-induced magnetization changes, and via magnetoelastic dynamic effects related to the acoustic excitation. We have investigated the MSAW magneto acoustic responses of the various devices in close connection with the static magnetic properties, especially the anisotropy, the coercivity and the hysteresis. An equivalent piezomagnetic model could support some of these observations. We show more generally that the proper choice of magnetic material and the control of the magnetic properties helps to build up specific sensors: soft magnetic materials enable to tailor the anisotropy of the MSAW response by engineering the IDT’s shape; hard magnetic materials enable to achieve high field unipolar or bipolar field response; exchange-biased systems in which the reversibility of the magnetic response is achieved let envision the development of sensors for out-of-plane magnetic fields
Mishra, Harshad. "Magnetic field sensor based on micro-structured magnetoelastic surface acoustic waves devices." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0147.
Full textThe last few decades have seen tremendous growth in the area of magnetic sensor technologies. The field has grown from simple micro-machined silicon based devices to more complex integrated microsystems combining high performance transducers as well as wireless interfaces. However, almost all of these devices operate with a complex mechanism while simultaneously being externally powered as well as expensive. Thus, there arises a deep need to develop a magnetic sensor that overcomes the challenges. This research work focused on the development of surface acoustic wave (SAW) sensors for the detection of magnetic field. Owing to the possibility of wireless interrogation, SAW devices of the resonator configuration have been considered in this study. The first part of our work aims to address the physics and interaction between the acoustic waves and magnetostrictive layers when subjected to a magnetic field. We investigated SAW resonators using LiNbO3 as the substrate and multi-layered [TbCo2/FeCo] as the electrode and sensitive material. We studied and showed the role of the shape effect in magnetism arising from the electrode geometry. A model experimental set-up was developed to demonstrate an application of the fabricated device as a sensor for detection of current along a cable. Subsequently, we developed a device that is self-compensated for the effects of temperature on the resonance frequency. The multi-layered sensor was based on ST-cut Quartz as the substrate whose positive temperature coefficient of frequency (TCF) was compensated for by the negative TCF of ZnO and CoFeB. Finally, we combine our understandings of the shape effects in magnetism and the multi-layered TCF compensated SAW structure to develop a device that is not only compensated for the effects of temperature on the resonance frequency but also on the magnetic anisotropy. In addition, this structure also presents the possibility of a proof-of-concept multi-sensory device because along with the temperature compensated resonance peak, there exist other resonances which are highly sensitive to any change in the temperature while at the same time immune to magnetic field
Kozlovski, Nikolai. "Passive wireless SAW sensors with new and novel reflector structures design and applications." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4954.
Full textID: 029809964; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2011.; Includes bibliographical references (p. 161-166).
Ph.D.
Doctorate
Electrical and Computer Engineering
Engineering and Computer Science
Haskell, Reichl B. "A Surface Acoustic Wave Mercury Vapor Sensor." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/HaskellRB2003.pdf.
Full textŠetka, Milena. "Nano-polypyrrol pro detekci plynných analytů a tekavých organických látek." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2020. http://www.nusl.cz/ntk/nusl-417804.
Full textStiller, Birgit. "Brillouin scattering in photonic crystal fiber : from fundamentals to fiber optic sensors." Thesis, Besançon, 2011. http://www.theses.fr/2011BESA2019/document.
Full textBrillouin scattering is a fundamental nonlinear opto-acoustic interaction present in optical fibers with important implications in fields ranging from modern telecommunication networks to smart optical fiber sensors. This thesis is aimed at providing a comprehensive theoretical and experimental investigation of both forward and backward Brillouin scattering in next generation photonic crystal fibers in view of potential applications to above mentioned fields. We show in particular that these micro-structured optical fibers have the remarkable ability to either suppress or enhance photon-phonon interactions compared to what is commonly observed in conventional fibers. Firstly, this thesis provides a complete experimental characterization of several photonic crystal fibers using a novel highly-resolved distributed sensing technique based on Brillouin echoes. We perform distributed measurements that show both short-scale and long-scale longitudinal fluctuations of the periodic wavelength-scale air-hole microstructure along the fibers. Our mapping technique is very sensitive to structural irregularities and thus interesting for fiber manufacturers to characterize and improve the fiber uniformity during the drawing process. With this technique, we also report the first experimental observationof the acoustic decay time and the Brillouin linewidth broadening in both standard and photonic crystal fibers. Furthermore, we experimentally demonstrate a simplified architecture of our Brillouin echoes-based distributed optical fiber sensor with centimeter spatial resolution. It is based on differential phase-shift keying technique using a single Mach-Zehnder modulator to generate a pump pulse and a _-phase-shifted pulse with an easy and accurate adjustment of delay. These sensing techniques are also applied to distributed strain measurement. Another aspect of this thesis is the investigation of a novel method for suppressing stimulated Brillouin scattering that is detrimental to optical fiber transmissions and fiber lasers. We experimentally study several fibers and a demonstrate 4 dB increase of the Brillouin threshold in a photonic crystal fiber by varying periodically the core diameter by only7%. The efficiency of this passive technique is verified by use of our distributed sensing technique where the oscillating Brillouin frequency shift is clearly observed.Lastly, we present experimental and numerical results demonstrating the simultaneous vi Abstract frequency-selective excitation of several guided acoustic Brillouin modes in a photonic crystal fiber with a multi-scale structure design. These guided acoustic modes are identified by using a full vector finite-element model to result from elastic radial vibrations confined by the air-silica microstructure. We further show the strong impact of structural irregularities of the fiber on the frequency and modal shape of these acoustic resonances
Hotel, Olivier. "Algorithmes, méthodes et modèles pour l'application des capteurs à ondes acoustiques de surface à la reconnaissance de signatures de composés chimiques." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066565/document.
Full textRecently, gas sensor arrays have found numerous applications in areas such as the food, the environment, the medicine and the defenseindustries. Among the existing technologies, the surface acoustic wave technology is one of the most promising and has been the subject of abundant research. The work described in this manuscript concerns the development of algorithms allowing the recognition of chemical compounds and the estimation of their concentration. This study describes a method for estimating the parameters of transduction phenomena. Their interest is demonstrated experimentally in applications consisting in identifying toxic chemical compounds, counterfeit coffee capsules and in detecting the presence of DMMP and 4-NT in the presence of interfering compounds
Sagnard, Marianne. "Conception et développement de composants à ondes élastiques de surface, dédiés à la détection passive et sans fil de grandeurs physiques et au filtrage radiofréquences à bandes multiples." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD051.
Full textThis thesis aims at designing innovative, passive and wireless surface acoustic waves (SAW) sensors and filters, dedicated to harsh environments. Several types of SAW components are consequently studied. The main characteristics, such as insertion losses or relative bandwidth, of usual structures (resonators, delay lines, LCRF, ladder filters…) are known by men of the art. However, to design a SAW device that respects specific requirements, the definition of the proper behavior of each device must be established before the manufacturing.For this purpose, numerical models are developed. Not only they include the possibility to analyse he beha-vior of systems with complex geometry (ladder filters, apodised transducers) but they take into account disturbing phenomena (transverse modes, losses due to the intrinsic nature of the materials). The comparison between computations and measures points out the match between experimental results and calculations.The implementation of these tools allows the development of innovative SAW sensors and filters thanks to a fast and reliable numerical analysis of their behavior.Thus, the design of resonators and sensors dedicated to a use at temperatures exceeding 700°C is studied. It is demonstrated that despite its inhomogeneity, Ba2TiSi2O8 is suitable for the manufacturing of SAW devices subject to high temperatures and in a frequency range from 300 MHz to the GHz.Furthermore, a structure composed of a three electrodes per wavelength transducer is used to produce re-sonators that are not subject to directivity effects when the temperature changes. This configuration offers the possibility to design sensors that use a single resonator (versus at least two until now). This last point makes smaller components possible and solves the question of a differential aging of the structures.A second type of sensors, also passive and wireless, dedicated to humidity measurements, based on the use of a single SAW, is studied. In this new configuration, a LCRF is used as a transponder and the sensitive area is outsourced. The mode sensitivity (of more than a MHz) to the variation of a capacitance or a dipole antenna is numerically brought to light. In practice, the device manufacturing showed a differential variation of the resonances of about 600 kHz depending on the electric condition applied to one of the ports.Finally, filters, dedicated to strategic applications, with frequency agility are designed. The purpose is to make the frequency vary depending on the electrical conditions applied to the mirrors. Two kinds of agility are identified : a slight sliding, of a few ‰ of the initial central frequency, periodic, and a frequency jump due to the shift of the Bragg band to the high frequencies. The manufacturing of some structures and their connection to MEMS switches attest the feasibility of such a structure.This work highlights the ability to predict the behavior of SAW structures thanks to the development of dedicated software. Moreover, the analysis and the manufacturing of innovative sensors and filters pave the way to new functionalities
Gizeli, Electra. "New acoustic wave sensor geometries." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282004.
Full textHotel, Olivier. "Algorithmes, méthodes et modèles pour l'application des capteurs à ondes acoustiques de surface à la reconnaissance de signatures de composés chimiques." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066565.
Full textRecently, gas sensor arrays have found numerous applications in areas such as the food, the environment, the medicine and the defenseindustries. Among the existing technologies, the surface acoustic wave technology is one of the most promising and has been the subject of abundant research. The work described in this manuscript concerns the development of algorithms allowing the recognition of chemical compounds and the estimation of their concentration. This study describes a method for estimating the parameters of transduction phenomena. Their interest is demonstrated experimentally in applications consisting in identifying toxic chemical compounds, counterfeit coffee capsules and in detecting the presence of DMMP and 4-NT in the presence of interfering compounds
Banerjee, Markus K. "Acoustic wave interactions with viscous liquids spreading in the acoustic path of a surface acoustic wave sensor." Thesis, Nottingham Trent University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302521.
Full textSehra, Gurmukh S. "Surface acoustic wave based flavour sensor system." Thesis, University of Warwick, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416148.
Full textLamothe, Marc. "Capteurs à ondes élastiques de surface à codage spectral Ultra Large Bande." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2070/document.
Full textApplying Ultra Wide Band (UWB) spectral coding to surface acoustic wave (SAW) devices, usedas passive sensors interrogated through a radio frequency link, increases the number of stored andexchanged data and improves the measurement resolution. The proposed approach is to design SAWUWB devices in the frequency band of 2 GHz − 2.5 GHz complying with the American radio frequencycommunication standards after prototyping them in the lower 200 MHz − 400 MHz frequency band.The authorized emitted power is −41.3 dBm/MHz: for a SAW device exhibiting insertion losses ofabout 30 dB, the interrogation distance determined by the RADAR equation adapted to SAW devicesis theoretically limited to 1 m. In order to improve the reading distance, we investigated severalarchitectures as standard SAW devices and as linear frequency modulated (LFM) devices, in order toreduce insertion losses. Using an embedded SAW reader, we simultaneously measured temperatureon three sensors, showing a solution to the problem of collision. The temperature resolution reachedwas 0.1 C for a reading distance of 20 cm. We show that the UWB communication is also a solutionfor communications in radio frequency wave reflective environment. Using a arbitrary waveformgenerator and an oscilloscope, we also show experimentally, that time reversal works on LFM SAWdevices, with the response signal to noise ratio improved by the processing gain
Pinkham, Wade A. "A Lateral Field Excited Acoustic Wave Pesticide Sensor." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/PinkhamWA2007.pdf.
Full textFrancois, Bruno. "Capteurs passifs à ondes élastiques de surface sans fil pour mesure paramétrique sur une gamme de température étendue (25 / 650ºC)." Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2027.
Full textDevelopment of wireless passive sensor for temperature measurement above 600°C has been performed in the frame of the European SAWHOT project. In this context, surface acoustic wave sensors have been designed, fabricated and characterized by radiofrequency measurement. Physical parameter measured by these sensors is the temperature, reaching values up to 900°C for monitoring in combustion engines andIn ovens used for carbon nano-tubes growth. In order to measure temperature in harsh environments, classical piezoelectric substrates are not usuable: langasite substrate has been considered as a favorable option since it exhibits no transition temperature and is able to operate until its exhibits no transition temperature and is able to operate until its melting temperature, at 1470 °C. regarding the parameters of the surface acoustic waves and the limitation of the fabrication process and devices, the resonators are measured wirelessly in the ISM band centered at 434 MHz (3μm of interdigital transducer period and a transducers with of 1μm). Two main manufacturing technologies are considered, stepper and nano-imprint technologies. The fabricated devices have been packaged by using an innovative process protecting the devices and allowing fir wireless measurements until 700°C. Multiple experiments have been performed in order to characterize the radiofrequency link between the reader and the sensor, the reproducibility of the measurement, the aging effect on the response of the device after high temperature cycles
Parmar, Biren Jagadish. "Development Of Point-Contact Surface Acoustic Wave Based Sensor System." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/279.
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