Tesis sobre el tema "Characterization of sensors"
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Petitdidier, Nils. "LSST: Characterization of the CCD sensors". Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168008.
Texto completoHughes, Höglund Joshua. "Bed-time sensors - characterization and comparison". Thesis, Uppsala universitet, Avdelningen för datorteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-371795.
Texto completoBlank, Kerstin. "Molecular force sensors design, characterization and applications /". Diss., [S.l.] : [s.n.], 2006. http://edoc.ub.uni-muenchen.de/archive/00006085.
Texto completoLOMBARDO, LUCA. "Development and characterization of sensors for human health". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2774813.
Texto completoAnnanouch, Fatima Ezahra. "Design, Optimization and Characterization of Metal Oxide Nanowire Sensors". Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/352214.
Texto completoEn esta tesis, he estudiado y desarrollado un método de deposición química en fase vapor asistido por aerosol (AACVD), para el crecimiento directo de nanoagujas de óxido de tungsteno funcionalizadas o intrínsecas. Los depósitos se han realizado sobre distintos sustratos transdcutores para su aplicación a la detección de gases. Esta técnica ofrece la posibilidad de co-depositar los metales con los óxidos metálicos empleando una sola etapa de deposición. La síntesis del material nanoestructurado, la fabricación del dispositivo, la caracterización de los materiales y la detección de gases han sido investigadas. El método AACVD se empleó para el crecimiento y la integración directa de la película de sensible sobre sustratos cerámicos (alúmina), MEMS (micro hotplates) y poliméricos flexibles, lo que demuestra su compatibilidad e idoneidad para el crecimiento de nanoestructuras de óxido metálicos sobre una amplia gama de sustratos transductores. Además, el método AACVD se ha implementado también en un reactor de pared fría para crecer las nanoestructuras de WO3, empleando el calentamiento localizado que permiten conseguir las microresistencias calefactoras integradas en algunos de los transductores empleados. Todas las películas sintetizadas en esta tesis doctoral se componían de nanoagujas de WO3 puro o de WO3 funcionalizado con nanopartículas de oro (Au), platino (Pt), óxido de cobre (Cu2O) o paladio (Pd). Se utilizaron diversas tecnologías de análisis para caracterizar la morfología, la estructura y la composición de las películas producidas. Los resultados mostraron que nuestro método es eficaz para el crecimiento de nanoagujas cristalinas de WO3 decoradas con nanopartículas de metales / óxidos metálicos, a temperaturas moderadas (es decir, 380 ° C), con eficacia en sus costes y con tiempos de fabricación cortos, directamente sobre el elemento trasndcutor con vistas a obtener sensores de gases. Los estudios de detección de gases han mostrado que este nanomaterial híbrido tiene una excelente sensibilidad y selectividad en comparación con muestras de WO3 puro. Además, los nanocompuestos Cu2O / WO3 y Pd / WO3 han demostrado poseer una excelente sensibilidad y selectividad hacia los gases H2S y H2, respectivamente.
In this thesis, I have studied and developed aerosol assisted chemical vapour deposition (AACVD) methods for the direct growth of non-functionalized and functionalized tungsten oxide nanoneedles, onto different transducer substrates, for gas sensing applications. This technique gives the possibility to co-deposit metals with metal oxides nanostructures within a single step deposition. The nanostructured material synthesis, device fabrication, material characterization and gas sensing performance have been investigated. AACVD method was employed for the direct growth and integration of the sensing film onto ceramic (alumina), MEMS (silicon micro hotplates) and flexible polymeric substrates, demonstrating its compatibility and suitability for growing metal oxide nanostructures onto a wide spectrum of sensor substrates. Furthermore, AACVD based on the localized heating of substrates employing their embedded resistive microheaters has been also performed and developed for the growth of WO3 nanostructures, using a cold wall reactor. All the synthesized films used in this doctoral thesis were composed of pure WO3 nanoneedles or WO3 nanoneedles functionalized with either gold (Au), platinum (Pt), cuprous oxide (Cu2O) or palladium (Pd) nanoparticles. Various analytical techniques were used to characterize the morphology, the structure and the composition of the produced films. The results showed that our method is effective for growing single crystalline WO3 nanoneedles decorated with metals/metal oxides nanoparticles at moderate temperatures (i.e., 380 °C), with cost effectiveness and short fabrication times, directly onto transducers in view of obtaining gas sensors. The gas sensing studies performed showed that these hybrid nanomaterials have excellent sensitivity and selectivity compared to pristine WO3 samples. Cu2O/WO3 and Pd/WO3 nanocomposites have shown excellent sensitivity and selectivity toward H2S and H2 gases respectively.
Griffiths, David John. "Development of Ionic Polymer Metallic Composites as sensors". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35676.
Texto completoMaster of Science
Tsolov, Peter. "Design, fabrication and characterization of thick-film gas sensors". Doctoral thesis, Universitat Rovira i Virgili, 2004. http://hdl.handle.net/10803/8450.
Texto completoTítulo: Diseño, fabricación y caracterización de sensores de capa gruesa
Doctorando: Peter Tsolov Ivanov
Director: Xavier Correig Blanchar
Los sensores de gases de estado sólido han demostrado ser muy prometedores para
supervisar la emisión de los agentes contaminadores en el aire, porque son una opción
de bajo coste para la construcción de analizadores de gases. Algunos problemas se
relacionados con este tipo de dispositivos, especialmente su baja selectividad y el alto
consumo de energía, siguen sin resolver. El objetivo de esta tesis doctoral es el
desarrollo de nuevos sensores y matrices de sensores con mejorada selectividad y
reducido consumo de energía.
La metodología usada en esta tesis consiste en fabricar matrices de sensores hechas de
sensores con distintas selectividades. Como la respuesta del sensor es diferente en
distintas temperaturas de trabajo y como los distintos dopantes o los filtros catalíticos
aceleran o reducen la respuesta del sensor, los diferentes sensores dan diferentes
reacciones. Combinando estas reacciones y con la ayuda de técnicas del reconocimiento
de patrones, se pueden crear grupos de sensores capaces de distinguir entre distintos
agentes contaminantes.
La tesis comienza repasando los métodos usados para la fabricación de los sensores de
gases y discutiendo los problemas relacionados con la baja selectividad de los óxidos
metálicos. Se especifican también los diferentes métodos para aumentar la selectividad.
Se introduce y se describe detalladamente la técnica de screen-printing. Los
experimentos se realizaron con cuatro tipos de substratos de sensores (cerámica, silicio,
microhotplate y silicon-on-insulator) y con más de 15 capas activas basadas en dióxido
de estaño y trióxido de tungsteno (puras y dopadas con oro, platino, plata, titanio y
paladio). Una amplia variedad de compuestos volátiles (amoníaco, etanol, acetona y
benceno), de gases (monóxido de carbono, dióxido de nitrógeno, metano y sulfuro de
PhD thesis of Peter Tsolov Ivanov Resumen de la tesis doctoral
hidrógeno) y de algunas mezclas binarias ha sido medida. Los resultados obtenidos por
los análisis cuantitativos y cualitativos de los gases estudiados con una matriz de
sensores basada en cuatro sensores simples nos han llevado a descubrir el óptimo
sensor/matriz para los distintos gases/mezclas binarias.
Los resultados demostraron que, con la ayuda de redes neuronales Fuzzy ARTMAP, es
posible identificar y cuantificar simultáneamente los gases analizados usando solamente
una matriz de microhotplates (cuatro sensores) con la misma capa activa. Los sensores
de SnO2 y de WO3 dopados demostraron diversa respuesta a los agentes contaminantes
probados. Componiendo cuidadosamente la matriz de sensores y definiendo bien la
temperatura de trabajo podemos discriminar, con un alto grado de éxito, los diversos
gases probados sin la necesidad de técnicas de reconocimiento de patrones.
La conclusión principal que se puede sacar de esta tesis es que las matrices de sensores,
junto con las técnicas de reconocimiento de patrones, se pueden utilizar para aumentar
perceptiblemente la selectividad de los sensores de óxidos metálicos. La simplicidad de
los métodos propuestos permite su uso en el desarrollo de analizadores de gases más
baratos y narices electrónicas portátiles.
A partir de la investigación realizada durante esta tesis doctoral se han elaborado 15
artículos publicados en revistas internacionales, 10 comunicaciones en las conferencias
internacionales y 3 comunicaciones en conferencias españolas.
PhD thesis of Peter Tsolov Ivanov Resume of the doctoral thesis
OF THE DOCTORAL THESIS
Title: Design, Fabrication and Characterization of Thick-Film Gas Sensors
Doctorate: Peter Tsolov Ivanov
Director: Xavier Correig Blanchar
Solid-state gas sensors have proved to be very promising for monitoring the emission of
air pollutants because they are a low cost option for constructing gas analysers. Some
problems associated to this approach, especially their deficient selectivity and high
power consumption, remain unsolved. The aim of this doctoral thesis is to develop new
sensors and sensor matrices that can improve the selectivity of metal oxide gas sensors
and decrease their power consumption.
The methodology used here consists of creating sensor matrices made from sensors with
different selectivities. As the sensor response is different at different working
temperatures and as the different dopants or catalytic filters accelerate or reduce the
sensor response, the different sensors give different reactions. If these reactions are
combined, sensor groups capable of discriminating between different pollutants can be
obtained with the help of pattern recognition techniques.
The thesis begins by reviewing the methods used for fabricating gas sensors and
discussing the problems caused by the poor selectivity of metal oxide gas sensors and
the methods for increasing their selectivity. Then, the screen-printing technique is
introduced and described. The experiments were performed with four different types of
gas sensor substrates (ceramic, silicon, microhotplate and silicon-on-insulator) and more
than 15 active layers (undoped and doped with gold, platinum, silver, titanium and
paladium tin dioxide and tungsten trioxide sensitive layers). A wide variety of volatile
compounds (ammonia, ethanol, acetone and benzene), gases (carbon monoxide,
nitrogen dioxide, methane and hydrogen sulphide) and some binary mixtures were
measured. The results obtained from quantitative and qualitative gas analysis using the
PhD thesis of Peter Tsolov Ivanov Resume of the doctoral thesis
sensor response from a simple 4 sensor based matrix led to the optimal sensor/sensor
matrix for gas/binary mixtures.
The results showed that, with the help of fuzzy ARTMAP neural networks, it is possible
to identify and simultaneously quantify the gases analysed by using only one MHP-chip
(four sensors) with the same active layer. The doped SnO2 and WO3 sensors showed
different response to the tested pollutants. Composing carefully the sensor matrix and
defining well the working temperature we were able to discriminate, with a high success
rate, between the different test gases with no need for pattern recognition techniques.
The main conclusion that can be drawn from this thesis is that sensor matrices can be
used, coupled to dynamic pattern recognition techniques, to significantly increase the
selectivity of metal oxide sensors. The simplicity of the methods implemented makes
them suitable for developing low-cost gas analysers and hand-held e-noses.
The research carried out during this doctoral thesis resulted in 15 articles being
published in international journals, 10 communications at international conferences and
3 communications at a Spanish national conference.
PhD thesis of Peter Tsolov Ivanov Resumen de la tesis doctoral
Unander, Tomas. "Characterization of Low Cost Printed Sensors for Smart Packaging". Licentiate thesis, Mid Sweden University, Department of Information Technology and Media, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-7049.
Texto completoCurrently there are very significant interests in printed electronics in the world. The possibility to produce electronics in a roll to roll printing process will considerably reduce the cost of the electronic devices. However, these new devices will most probably not replace the traditional silicon based electronics, but will be a complement in low cost applications such as in intelligent packages and other printable media. One interesting area is printable low cost sensors that add value to packages. In this thesis a study of the performance of low cost sensors is presented. The sensors were fabricated using commercial printing processes used in the graphical printing business. The sensors were characterized and evaluated for the intended application. The evaluated sensors were moisture sensing sensor solutions and touch sensitive sensor solutions.
A printable touch sensitive sensor solution is presented where the sensor is incorporated into a high quality image such as in point of sales displays. The sensor solution showed good touch sensitivity at a variety of humidity levels. Four printed moisture sensor concepts are presented and characterized. Firstly, a moisture sensor that shows good correlation to the moisture content of cellulose based substrates. Secondly, a sensor that measures the relative humidity in the air, the sensor has a measuring accuracy of 0.22% at high relative humidity levels. Thirdly, a moisture sensor that utilizes unsintered silver nano-particles to measure the relative humidity in the air, the sensor has a linear response at very low relative humidity levels. And fourth, an action activated energy cell that provides power when activated by moisture. A concept of remote moisture sensing that utilizes ordinary low cost RFID tags has also been presented and characterized. The remote sensor solution works both with passive and semi-passive RFID systems. The study shows that it is possible to manufacture low cost sensors in commercial printing processes.
Det är för närvarande ett stort intresse för tryckt elektronik. Att kunna tillverka elektroniska komponenter i en rulle till rulle process möjliggör en reducering av tillverkningskostnaden. Dessa nya komponenter kommer sannolikt inte konkurrera ut den traditionella kiselbaserade elektroniken utan kommer att kunna komplimentera kiselelektronik i segment där kostnaden är väldigt viktig som i intelligenta förpackningar och andra tryckta medier. Ett intressant område är tryckta sensorer som kan addera värde till förpackningar. I denna avhandling presenteras en studie kring tryckta sensorer som kan tillverkas till låg kostnad. Sensorerna är tillverkade i kommersiella grafiska tryckpressar. Sensorerna karakteriseras och utvärderas för de applikationer som de är tänkta för. I denna avhandling har fuktsensorer och beröringskänsliga sensorer undersökts.
Det presenteras en tryckt beröringskänslig sensor som integreras i ett högkvalitativt grafiskt tryck. Denna sensor är tänkt att användas i reklamskyltar för att skapa interaktivitet. Sensorn har en bra känslighet vid varierande fukthalter. Även fyra fuktsensorer presenteras och utvärderas. Den första sensorn mäter fukthalten i cellulosabaserade substrat och visar en bra korrelation till fukthalten i substratet. Den andra sensorn mäter den relativa fukten i luften, denna sensor har en mätnoggrannhet på 0.22% för höga fukthalter. Den tredje sensorn använder partiklar i nanostorlek för att mäta fukthalten i luften. Denna sensor fungerar väldigt bra vid låga fukthalter. Den fjärde sensorn är en energicell som producerar el när den blir fuktig. Även en fuktsensor som kan läsas av på håll utvärderas. Detta sensorkoncept är baserad på vanliga RFID taggar och kan användas med både passiva och semi-passiva taggar. Denna avhandling visar att det är möjligt att tillverka sensorer till en låg kostnad in en traditionell grafisk tryckpress.
Wang, Xiaozhen. "Characterization of Fiber Tapers for Fiber Devices and Sensors". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23330.
Texto completoLee, Hsiao-Yen. "Synthesis and characterization of nano-sructured materials for sensors". Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505052.
Texto completoHeymes, Julian. "Depletion of CMOS pixel sensors : studies, characterization, and applications". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE010/document.
Texto completoAn architecture of CMOS pixel sensor allowing the depletion of the sensitive volume through frontside biasing is studied through the characterization in laboratory of a prototype. The charge collection performances confirm the depletion of a large part of the sensitive thickness. In addition, with a modest noise level, the sensor features an excellent energy resolution for photons below 20 keV at positive temperatures. These results demonstrate that such sensors are suited for soft X-ray spectroscopy and for charged particle tracking in highly radiative environment. A simplified analytical model and finite elements calculus are used to predict the depletion depth reached. An indirect measurement method to evaluate this depth is proposed. Measurements confirm predictions for a thin highly resistive epitaxial layer, which is fully depleted, and a 40micrometers thick bulk less resistive substrate, for which depletion reached 18 micrometers but which still offers correct detection over its full depth. Two sensor designs dedicated to X-ray imaging and in-brain neuroimaging on awake and freely moving rats are presented
Diaz, Juan D. "Testing and characterization of carbon nanotubes as strain sensors". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69506.
Texto completo"June 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 42-43).
The potential of using carbon nanotube coated flexible cloth as strain gauges was studied. Samples were prepared by sonicating strips of cloth inside a 1mg/ml carbon nanotube in propylene carbonate solution. A dynamic mechanical analyzer was built that applied uniaxial cyclical strains to the samples and recorded the force and strain applied. The DMA also provided a constant voltage to the samples while recording the resistance response of the strain gauges. The samples were tested using the dynamic mechanical analyzer for their response to variables such as strain and time. The samples were successfully tested at strains ranging from 1% to 50%. The conductivity of the samples was measured. We studied the effects that a carboxylate and the sulfonate functional groups of the carbon nanotubes have on the strain sensors, the effect of the sonication time, and the effect that leaving the strain sensors inside the solution for different amount of times has on the strain sensors. It was discovered that the samples dried overtime, thus decreasing the conductivity of the samples and damaging the strain sensors. An encapsulation method was developed and studied to counter the drying effect. The results showed that the encapsulation method did delay the decaying of the samples. Moreover, it was concluded that the sulfonate group had higher changes in resistance than the carboxylate group. While increased sonication time did not seem to have a measurable effect on the resistance of the sulfonate CNT samples, this was not true for the carboxylate group CNTs. The carboxylate group CNTs seemed to have a higher initial resistance with longer sonication time and a lower resistance with increasing time sitting in the solution. Overall, it was concluded that carbon nanotubes have a promising potential as macro level strain sensors for high-elongation applications but more development is yet to be done.
by Juan D. Diaz.
S.B.
Newton, Cory Nelson. "Design and Frequency Characterization of Dual-Piezoresponsive Foam Sensors". BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/9264.
Texto completoGhassemi, Parham. "Multi-Constriction Microfluidic Sensors for Single-Cell Biophysical Characterization". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/89947.
Texto completoMS
Younkman, Lora Birkefeld. "Development and Characterization of Ceramic-Based Carbon Monoxide Sensors /". The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1273585788.
Texto completoBeregovskii, Iouri. "Design and characterization of integrated-optic-based chemical sensors". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/285055.
Texto completoAnderson, Ryan R. "Characterization and Preliminary Demonstration of Microcantilever Array Integrated Sensors". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3150.
Texto completoBonacchi, Sara <1979>. "Design and Characterization of New Luminescent Sensors and Labels". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1610/1/Bonacchi_Sara_Tesi.pdf.
Texto completoBonacchi, Sara <1979>. "Design and Characterization of New Luminescent Sensors and Labels". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1610/.
Texto completoMariani, Federica <1991>. "Design and characterization of Electrochemical Sensors for Organic Bioelectronics". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9382/1/XXXII%20PhD%20Tesi_Mariani%20Federica.pdf.
Texto completoAFIFY, AHMED SABRY SHEHATA. "Elaboration and characterization of humidity sensors for environmental monitoring". Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2639114.
Texto completoSanthosh, P. N. "Synthesis and characterization of titania based electroceramic voltage sensors". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1996. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2922.
Texto completoBorri, Marcello. "Characterization of 3D silicon assemblies for ATLAS pixel upgrade". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/characterization-of-3d-silicon-assemblies-for-atlas-pixel-upgrade(ade5b052-e8f5-45bc-bef8-7bd259d09444).html.
Texto completoMartins, Gilmar Antonio dos Santos. "Identificação de plásticos comerciais por meio de um nariz eletrônico baseado em polímeros condutores". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-31052011-152800/.
Texto completoThis research consists in the development of a new technique capable of the identification of polymeric materials using an electronic nose. Electronic noses have been developed for automatic detection and classification of odors, vapors and gases. They are instruments capable of measuring the concentration or intensity of an odorant similarly to an olfactometer, but without the inherent limitations of the human panel, which is highly desired. The electronic nose is composed by a system of chemoresistive sensors, in this case, an array of four sensors was used, which were made through a deposition of thin films of doped conductive polymers, on the surface of interdigitated electrodes. These sensors were connected to conductivity meters coupled to a personal computer (PC) through AD converters. The PC had acquisition and data processing softwares installed on it. Thirty readings were made or each analyzed polymer consisting of alternated 5 seconds exposure periods and 45 seconds recovery periods. The collected data were statistically processed by Principal Component Analysis (PCA). This electronic nose was efficient, being able to identify nine types of polymeric materials through the analysis of the different volatile compounds released when these materials were heated to the heat of 257ºC. A 100% correct classification score was obtained in the 30 sets of analysis.
Wu, Zhaohui. "Modeling and characterization of high-temperature silicon-based thermal sensors". Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31057652.
Texto completoIsaza, Clara Eugenia. "Biochemical and structural characterization of novel metalloprotein sensors and carboxypeptidases". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117548268.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xi, 98 p.; also includes graphics. Includes bibliographical references (p. 93-98). Available online via OhioLINK's ETD Center
Ferrier, Graham Alan. "Spectral characterization of distributed Brillouin sensors in the transient regime". Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26481.
Texto completoXu, Ruisong. "Rational design, synthesis and characterization of response selective fluorescent sensors /". Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1342739831&sid=20&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Texto completoMa, Ning. "CHARACTERIZATION OF CARBON NANOTUBES BASED RESISTIVE AND CAPACITIVE GAS SENSORS". UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/558.
Texto completoWu, Zhaohui y 吳朝暉. "Modeling and characterization of high-temperature silicon-based thermal sensors". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31057652.
Texto completoSavvas, Michail. "Characterization of terahertz bi-material sensors with integrated metamaterial absorbers". Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37711.
Texto completoTHz radiation covers the region of the electro-magnetic (EM) spectrum between the microwaves and infra-red (IR), corresponding to frequencies from approximately 100 GHz to 10 THz. Recently, new imaging techniques, which take advantage of the special properties of THz waves, have been developed. Despite the great interest in these new techniques, limitations such as the lack of appropriate detectors and powerful sources are placing the technology in the research domain. The objective of this thesis is to characterize and analyze a set of fabricated bi-material detectors integrated with thin metamaterial films. Different experimental measurements were performed to measure the main figures of merit of the detectors and analyze them. Initially, optical microscopy was used to measure the dimensions of the sensors and stress induced curvature. Then, the thermal response of the sensors was tested and analyzed. The responsivity, the speed of operation and the minimum detected incident power were measured using a quantum cascade laser (QCL), operating at 3.8 THz. The measured experimental data agree well with the theoretical calculated values of the performance parameters.
Imokawa, Toru. "Fabrication and characterization of nanostructured palladium hydride microelectrode pH sensors". Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288455.
Texto completoZayouna, Sarah. "Characterization of Silicon Waveguides For Non-Dispersive Infrared Gas Sensors". Thesis, Luleå tekniska universitet, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80451.
Texto completoCruickshank, Stuart F. "Identification and characterization of hydrostatic pressure sensors in marine brachyurans". Thesis, University of Aberdeen, 1999. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU123740.
Texto completoMOUMEN, ABDERRAHIM. "PREPARATION AND CHARACTERIZATION OF SEMICONDUCTOR NANOSTRUCTURES FOR CHEMICAL SENSORS APPLICATIONS". Doctoral thesis, Università degli studi di Brescia, 2021. http://hdl.handle.net/11379/546121.
Texto completoPREPARATION AND CHARACTERIZATION OF SEMICONDUCTOR NANOSTRUCTURES FOR CHEMICAL SENSORS APPLICATIONS
Rivest, Christopher W. (Christopher Warren). "Design and characterization of a low cost dual differential proving ring force sensor utilizing Hall-effect sensors". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36709.
Texto completoIncludes bibliographical references (leaf 31).
A novel dual differential hall-effect based proving ring force sensor has been designed, manufactured, and tested. Strain gauge based force sensors are among the most common methods of measuring static and dynamic forces, yet they suffer from a wide array of negative attributes including: high cost due to signal amplification instrumentation, high temperature sensitivity, and only moderate dynamic range. The goal of the research herein described was to design and test a low cost, high dynamic range force sensor. Hall-Effect sensors have high bandwidth (>100 kHz), a wide dynamic range, are low in cost (<0.5$), and are ideally suited to dynamic and static force measurements. Proving rings - diametrally loaded hoops of metal, have long been used to measure force yet suffer many setbacks due to their historical designs utilizing mechanical and strain gauge methods of strain detection. A novel nested proving ring flexure has been combined with hall-effect sensors to fulfill the design requirements of a low cost and robust force sensor. Initial data demonstrates that the nested proving ring force sensor herein described is capable of resolving forces of in the range of 0 to 30 Newtons with an accuracy of 0.235 Newtons, all at a potential mass-manufactured cost of U.S. $10.00 per unit.
by Christopher W. Rivest.
S.B.
You, Tao. "Preparation and characterization of ceramic sensors for use at elevated temperatures /". View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3186928.
Texto completoWu, Yonggang. "Design, Synthesis and Characterization of Zinc(II)-Selective Ratiometric Fluorescent Sensors". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19735.
Texto completoDobashi, Yuta. "Characterization of ionic polymers : towards applications as soft sensors in medicine". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59565.
Texto completoApplied Science, Faculty of
Graduate
Eriksson, Anders. "Modeling and characterization of nonlinear materials for protection of optical sensors /". Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek673s.pdf.
Texto completoSARINK, NIEKE. "Characterization and Manufacturing of Textile Pressure Sensors based on Piezoelectric Fibres". Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18054.
Texto completoProgram: Master programme in Textile Engineering
Wang, Liming. "Development and characterization of ceramic-based NOx sensors for automotive applications /". The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487949508371872.
Texto completoSavage, Nancy Ortins. "Development and characterization of high temperature, selective, titania-based gas sensors /". The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488203857249405.
Texto completoSamoei, Victor K. "Fabrication and Characterization of Thin film Pressure Sensors using Novel Materials". University of Toledo / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596762165322848.
Texto completoFoley, Justin Dean. "Calibration and Characterization of Cubesat Magnetic Sensors Using a Helmholtz Cage". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/903.
Texto completoMuñoz, Martín Jose María. "Advanced amperometric nanocomposite sensors based on carbon nanotubes and graphene: characterization, optimization, functionalization and applications". Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/311424.
Texto completoEntre la amplia gama de nanocompósitos, la incorporación de materiales conductores nanoestructurados de carbono, entre los que se encuentran los nanotubos de carbono (NTCs) y el grafeno, dentro de una matriz polimérica aislante, es una forma muy atractiva de combinar las propiedades mecánicas y eléctricas únicas del material de relleno con los atributos de los plásticos. Concretamente, los materiales nanocompósitos basados en carbono han jugado un gran liderazgo en el campo de la electroquímica analítica, sobre todo en el desarrollo de dispositivos (bio)sensores, debido a sus interesantes ventajas con respecto a un material conductor puro. Dichas ventajas les proporcionan un alto valor añadido, como versatilidad, durabilidad, fácil regeneración de la superficie e integración, simple incorporación de (bio)modificadores o baja corriente de fondo, entre otras. En este sentido, esta tesis aborda el desarrollo de sensores nanocompósitos avanzados de tipo amperométrico que, habiendo sido optimizada su relación carbono/polímero, pueden ser modificados con un amplio abanico de nanopartículas (NPs) para mejorar su eficiencia electroanalítica. Las propiedades eléctricas de estos nanocompósitos y, por lo tanto, su aplicabilidad analítica, están directamente influenciadas tanto por la naturaleza de las partículas conductoras como por la cantidad y distribución espacial de éstas a través de la matriz polimérica aislante. Una de las propiedades electroquímicas más importantes que envuelven a estos materiales es la similitud de su comportamiento electroquímico con respecto a un array de microelectrodos. Por lo tanto, una optimización de la relación carbono/polímero con respecto a la naturaleza del material conductor de partida permitirá lograr una mayor dispersión de las áreas conductoras a través de las zonas no conductoras, presentando beneficios similares a los de un array de microelectrodos. Además, es conocido que algunos parámetros, tales como la resistividad del material compuesto, la transferencia electrónica, la robustez del material y la corriente capacitiva están fuertemente influenciadas por la naturaleza física de la muestra de nanotubos de partida, como son su relación longitud/diámetro o su pureza, hecho que pueden influir fuertemente en la respuesta electroanalítica final del material transductor. Bajo este contexto, la primera etapa de esta tesis consistió en la implementación de un conjunto de técnicas instrumentales que, aplicadas de manera sistemática, han perimitido, la caracterización y optimización de la composición de materiales nanocompósitos basados en nanotubos de carbono y resina epoxi (Epotek H77) con respecto a la naturaleza de los NTCs de partida para la fabricación de sensores electroquímicos más eficientes. El protocolo de caracterización llevado a cabo incluye herramientas eléctricas, electroquímicas, morfológicas, microscópicas, espectroscópicas y electroanalíticas. Una vez optimizada las proporciones de NTC/epoxi, el siguiente paso consistió en mejorar el rendimiento analítico de estos sensores electroquímicos nanocompósitos incorporándoles diferentes NPs con la finalidad de introducir algún tipo de efecto electrocatalítico. Para alcanzar este objetivo, se desarrolló una metodología simple para la síntesis de una amplia gama de NPs. La Síntesis Intermatricial (IMS) fue utilizada como técnica verde para el diseño de tres rutas diferentes que permitan una incorporación personalizada de estas NPs en el material transductor, obteniendo así sensores amperométricos más sensibles a diferentes analitos. Finalmente, los estudios de caracterización y funcionalización implementados en los sensores nanocompósitos basados en NTCs han sido extendidos para materiales nanocompósitos basados en otra forma alotrópica del carbono: el grafeno, el cual es el último descubrimiento en términos de material de carbono nanoestructurado.
Among the wide range of nanocomposites, the incorporation of conducting nanostructured carbon materials, such as carbon nanotubes (CNTs) and graphene, into an insulating polymeric matrix is a very attractive way to combine the unique mechanical and electrical properties of individual filler with the advantages of plastics. Concretely, carbon–based nanocomposite materials have played a leading role in the analytical electrochemistry field, particularly in (bio)sensor devices, due to their interesting advantages regarding to a pure conductive material, such as versatility, durability, easy surface regeneration and integration, facile incorporation of a variety of (bio)modifiers or low background current, among others. Accordingly, this thesis tackles the development of advanced amperometric nanocomposite sensors that having been optimized regarding to carbon/polymer composition ratios, can be tunable with different types of nanoparticles (NPs) for improving their electroanalytical efficiency. The electrical properties of these nanocomposites and, therefore, their analytical applicability, are directly influenced by the conducting particles nature and the amount and spatial distribution of them through the insulating polymeric matrix. One of the most important electrochemical properties of these materials is the similarity of their electrochemical behavior with a microelectrode array. Thus, an optimization of the carbon/polymer ratio with respect to the nature of the conducting material will allow to achieve a greater dispersion of the conducting areas through the non-conducting areas, presenting similar benefits to the microelectrode array. In addition, it is known that some parameters, such as composite resistivity, heterogeneous electron transfer rate, material robustness and background capacitance current are strongly influenced by the physical nature of the raw CNT sample, such as their diameter/length ratio and purity, fact that may strongly influences the final electroanalytical response of the transducer material. Under this context, the first step of this thesis consisted of implementing a group of instrumental techniques that, systematically applied, have allowed the characterization and optimization of nanocomposite materials composition based on CNTs and epoxy resin (Epotek H77) in relation to the nature of the raw CNT sample for the fabrication of more efficient electrochemical sensors. The developed characterization protocol includes electrical, electrochemical, morphological, microscopic, spectroscopic and electroanalytical tools. Having been optimized the MWCNT/epoxy composition ratios, the next step consisted of enhancing the analytical performance of these electrochemical nanocomposite sensors introducing some electrocatalytical effect by the incorporation of different NPs. For this goal, a simple methodology for synthesizing a wide range of different NPs has been developed. Intermatrix Synthesis (IMS) has been used as a green technique to design three different routes for CNT/epoxy nanocomposite electrodes modification, which offer a customized way for the preparation of sensitive amperometric sensors. Finally, the characterization and functionalization studies applied for CNT–based electrochemical nanocomposite sensors have been extended for nanocomposite materials based on another allotropic form of carbon: the graphene, which is the last discovery in terms of nanostructured carbon material.
NASCIMENTO, Mylena Pinto. "Estudos das propriedades estruturais e morfológicas, e avaliação da possibilidade de utilização como sensores de gases das PEROVSKITAS TRFeO3 (TR= Sm, Eu, Gd)". Universidade Federal de Pernambuco, 2010. https://repositorio.ufpe.br/handle/123456789/18286.
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Esse trabalho apresenta a produção e caracterização estrutural e morfológica das perovskitas simples TRFeO3 (TR = Sm, Eu, Gd), e o estudo da possibilidade de utilização desses sistemas como sensores de gás. Todas as amostras de TRFeO3 foram produzidas pela síntese de reação no estado sólido, que é uma síntese ainda pouco explorada na literatura para a obtenção desse sistema. O estudo das propriedades estruturais foram realizados por difração de raios X e adsorção e dessorção de N2, e a análise morfológica foi realizada através da microscopia eletrônica de varredura (MEV). Todas essas análises foram estudadas em função da temperatura e tempo de sinterização, bem como do cátion da terra rara utilizada. Através das análises por difratometria, foi possível a identificação da fase formada e a estimativa do tamanho médio do cristalito. Tais análises revelaram coexistência de fase com o composto TR3Fe5O12 para amostras sinterizadas a 1200°C, independente do tempo de sinterização utilizado, onde houve uma tendência a um equilíbrio na formação das fases. Já as amostras sinterizadas a 1100°C apresentaram-se monofásicas com o composto TRFeO3, com tamanho de cristalito variando conforme o tempo de sinterização. As imagens de MEV mostraram uma morfologia porosa, adequada para sensores de gás, apresentando grãos com formatos arredondados e formação de pescoço, conforme o tempo de sinterização utilizado. Independente da temperatura e tempo de sinterização, o tamanho dos grãos variaram em torno de 1 mm. Para avaliar a sensibilidade aos vapores de gasolina, foi desenvolvido um sistema baseado em medidas de resistividade elétrica, usando o método de 4-fios de Kelvin. Os resultados revelaram que um mecanismo diferente da literatura, onde a resistividade do material diminuiu quando exposto à atmosfera da mistura ar sintético/gasolina, a partir da temperatura ambiente, com boa reprodutibilidade. Através da dinâmica de tempo de resposta, em alta concentração de vapor do combustível utilizado, foi verificado que a capacidade sensorial dos compostos estudados, possivelmente, possui uma limitação com relação aos parâmetros estruturais, já que ambas propriedades estão relacionadas. Essa observação foi comprovada através do estudo realizado pelas medidas de adsorção e dessorção de N2, onde a área superficial das amostras foi em torno de 1,8 m2/g, o que diminui, significantemente, a sensibilidade.
This paper presents the production and structural and morphological characterization of simple perovskites REFeO3 (RE = Sm, Eu, Gd), and the possibility of using such systems as gas sensors. All REFeO3 samples were produced by the synthesis of solid state reaction, which is still little explored in the literature to obtain this system. The study of structural properties were carried out by X-ray diffraction and N2 adsorption and desorption, and the morphological analysis by scanning electron microscopy (SEM). All these tests were studied as a function of temperature and sintering time, and the rare earth cation used. Through this analysis by diffraction was possible to identify the phase formed and the estimated average size of crystallite. Such analysis revealed the coexistence of phase with the compound RE3Fe5O12 for samples sintered at 1200°C, regardless of time of sintering, where there was a tendency to an equilibrium in the formation stage. The samples sintered at 1100°C were presented with the monophasic compound REFeO3, with crystallite size varying according to the sintering time. The SEM images showed a porous morphology, suitable for gas sensors, showing grains with rounded shapes and neck formation, in accordance with the sintering time used. The grain size varied around 1 mm independent of temperature and sintering time. A system based on measurements of electrical resistivity, using the method of 4-wire Kelvin, was developed to detect the sensitivity to the vapors of gasoline. The results revealed that a different mechanism from literature, where the resistivity of the material decreased when exposed to atmospheric mixing synthetic air/gasoline from the ambient temperature, with good reproducibility. Through the dynamic response time, at high concentration of gasoline vapor, it was found that the sensory ability of the compounds studied, possibly, has a limitation with respect to structural parameters, since both properties are related. This observation was confirmed by the study performed by the measures of the adsorption and desorption of N2, where the surface area of the samples was about 1.8 m2/g, which decreases significantly the sensitivity.
Venditti, Iole. "Synthesis and characterization of nanostructured polymers for optical, electronic, and biological applications". Doctoral thesis, La Sapienza, 2007. http://hdl.handle.net/11573/917300.
Texto completoMa, Aihui. "Synthesis and characterization of miniaturized fluorescence sensors for aqueous and cellular measurements". ScholarWorks@UNO, 2005. http://louisdl.louislibraries.org/u?/NOD,240.
Texto completoTitle from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemistry."--Dissertation t.p. Vita. Includes bibliographical references.
Wang, Tao. "Optimization and Characterization of Integrated Microfluidic Surface Acoustic Wave Sensors and Transducers". Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6153.
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