Дисертації з теми "Tyre sensor"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Tyre sensor".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
He, Mingzhe, and Xinyu Lin. "Connected Tyres : Real-time Tyre Monitoring System for Fleet& Autonomous Vehicles with Tyre WearEstimation through Sensor Fusion." Thesis, KTH, Fordonsdynamik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290080.
Повний текст джерелаDäck är en viktig del för fordon, eftersom de är den enda kontaktpunktenmellan fordonet och vägen. Intelligenta däck är ett trendigt nytt ämne i däckindustrin.De är utformade för att övervaka olika däcktillstånd och skicka dennainformation till både förare och fjärrservrar. Examensarbetet är inriktat på ettförslag till ett däckövervakningssystem i realtid för fordonsflottor och autonomafordon och inkluderar en däckslitagesmodell och anslutning. Det inkluderaratt utveckla en slitagemodell och analys av den aktuella däcktrycksövervakningsfunktionengenom att studera Volvos fordonspark som är utrustade medVolvos webbmolntjänst. Däckens slitagemodell övervakar indirekt slitbanedjupetpå alla fyra däck genom att identifiera egenskaper mellan slitna och nyadäck. De två egenskaperna identifieras genom att övervaka och analysera fordonshastighet och bromssignaler. De två egenskaperna är inmatade i ett röstningsschemasom avgör när ett slitet däck upptäcks. Testfordonet var en VolvoXC40 med tre typer av däck, vinterdäck samt nya och slitna sommardäck.Modellen ger 90 % noggrannhet för 10 uppsättningar testdata, slumpmässigtvalda från alla dataset på Hällered provbana (Sverige). Anslutningen genomfördataöverföringen av rådata från onCAN och FlexRay-signaler lagrade ienVolvoswebbmolntjänst till däcksövervakningssystemet. Signalerna filtrerasoch samplas på nytt för att skapa de nödvändiga signalerna till däcktrycksövervakningssystemetoch däckslitagemodellen. Två signaler, kalibreringsstatusoch iTPMS-status, används för att utföra en statistisk analys av däcktrycketgenom att kategorisera kalibreringsstatus och däcktrycksförhållanden. Projektetsresultat är ett gränssnitt byggt på MATLAB GUI för demonstration avfordonsidentifiering och däcktillstånd. med inbäddad däckslitagemodell ochanslutning.
Cao, Siyang. "Flexible bond wire capacitive strain sensor for a vehicle tyre." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6619/.
Повний текст джерелаDI, MONACO FRANCESCO. "Product development methodologies for self-powered sensor-nodes in vehicle tyres." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2534687.
Повний текст джерелаStariak, Gabriel. "Tenzometrické závěsy kol Formule Student." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254217.
Повний текст джерелаJohnson, Simon. "Field effect transistor type sensors." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259174.
Повний текст джерелаStamm, Christoph Georg. "Integrated-optical difference interferometer as direct bio-chemical sensor, refractometer, and humidity sensor /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10943.
Повний текст джерелаSuzuki, Y., D. Ogura, M. Shikida, Y. Hasegawa, and K. Sato. "Development of Fabric-Type of Tensional Force Sensor." IEEE, 2009. http://hdl.handle.net/2237/13918.
Повний текст джерелаAmiri, Parian Jafar Parian Jafar Amiri. "Sensor modeling, calibration and point positioning with terrestrial panoramic cameras /." [S.l.] : [s.n.], 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17094.
Повний текст джерелаNaddafzadeh, Shirazi Ghasem. "Optimization in wireless sensor and machine-type communication networks." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46658.
Повний текст джерелаLi, Jun. "VM-based event-processing in sensor networks." Zurich : ETH, Swiss Federal Institute of Technology, Department of Computer Science, Systems Group, 2008. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=380.
Повний текст джерелаLe, Xuqing. "Fire Detection Robot using Type-2 Fuzzy Logic Sensor Fusion." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32471.
Повний текст джерелаGuggenbühl, Gasser Barbara Elisabeth. "Sensory and non-sensory assessment of consumer quality of apples /." Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17014.
Повний текст джерелаBoltshauser, Thomas. "CMOS humidity sensors /." [S.l.] : [s.n.], 1993. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10320.
Повний текст джерелаHasegawa, Y., M. Shikida, D. Ogura, and K. Sato. "Glove Type of Wearable Tactile Sensor Produced by Artificial Hollow Fiber." IEEE, 2007. http://hdl.handle.net/2237/9569.
Повний текст джерелаMeyer, Jan. "Textile pressure sensor : design, error modeling and evaluation /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18050.
Повний текст джерелаVogt, Harald. "Protocols for secure communication in wireless sensor networks /." Zürich : ETH, 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18174.
Повний текст джерелаYokota, T., J. Naito, M. Shikida, and K. Sato. "Micro-Machined Stent-Type Flow Sensor for Evaluation of Nasal Respiration." IEEE, 2009. http://hdl.handle.net/2237/13915.
Повний текст джерелаArecco, Daniel. "Analysis and preliminary characterization of a MEMS cantilever-type chemical sensor." Digital WPI, 2004. https://digitalcommons.wpi.edu/etd-theses/806.
Повний текст джерелаFourie, Dehann. "Multi-modal and inertial sensor solutions for navigation-type factor graphs." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/114000.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 335-357).
This thesis presents a sum-product inference algorithm for in-situ, nonparametric platform navigation called Multi-modal iSAM (incremental smoothing and mapping), for problems of thousands of variables. Our method tracks dominant modes in the marginal posteriors of all variables with minimal approximation error, while suppressing almost all low likelihood modes (in a non-permanent manner) to save computation. The joint probability is described by a non-Gaussian factor graph model. Existing inference algorithms in simultaneous localization and mapping assume Gaussian measurement uncertainty, resulting in complex front-end processes that attempt to deal with non-Gaussian measurements. Existing robustness approaches work to remove "outlier" measurements, resulting heuristics and the loss of valuable information. Track different hypotheses in the system has prohibitive computational cost and and low likelihood hypotheses are permanently pruned. Our approach relaxes the Gaussian only restriction allowing the frontend to defer ambiguities (such as data association) until inference. Probabilistic consensus ensures dominant modes across all measurement information. Our approach propagates continuous beliefs on the Bayes (Junction) tree, which is an efficient symbolic refactorization of the nonparametric factor graph, and approximates the underlying Chapman-Kolmogorov equations. Like the predecessor iSAM2 max-product algorithm [Kaess et al., IJRR 2012], we retain the Bayes tree incremental update property, which allows for tractable recycling of previous computations. Several non-Gaussian measurement likelihood models are introduced, such as ambiguous data association or highly non-Gaussian measurement modalities. In addition, keeping with existing inertial navigation for dynamic platforms, we present a novel continuous-time inertial odometry residual function. Inertial odometry uses preintegration to seamlessly incorporate pure inertial sensor measurements into a factor graph, while supporting retroactive (dynamic) calibration of sensor biases. By centralizing our approach around a factor graph, with the aid of modern starved graph database techniques, concerns from different elements of the navigation ecosystem can be separated. We illustrate with practical examples how various sensing modalities can be combined into a common factor graph framework, such as: ambiguous loop closures; raw beam-formed acoustic measurements; inertial odometry; or conventional Gaussian-only likelihoods (parametric) to infer multi-modal marginal posterior belief estimates of system variables.
by Dehann Fourie.
Ph. D.
Choi, Woo-Hyuck. "Needle-Type Sensor For In Situ 3-D Multi-Analyte Mapping." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321641570.
Повний текст джерелаArecco, Daniel. "Analysis and preliminary characterization of a MEMS cantilever-type chemical sensor." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0511104-150948.
Повний текст джерелаKeywords: frequency; vibration; vibrometry; detection; resonance; micromechanical; polymer; absorption; AFM; SEM; holography; optoelectronic; silicon; hydrogen; palladium. Includes bibliographical references (p. 151-161).
Wilson, Emma Rachel. "Cellular pathomechanisms in hereditary sensory neuropathy type 1." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10037613/.
Повний текст джерелаLenggenhager, René. "CMOS thermoelectric infrared sensors /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10744.
Повний текст джерелаCorrer, Wagner Rafael. "Development of impedimetric DNA sensor for diagnosis of Human Papillomavirus type 18 infection." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-05032015-144417/.
Повний текст джерелаA estratégia mais empregada atualmente na detecção de sequência de DNA é a PCR (Reação em Cadeira da Polimerase). Contudo, nos últimos anos, a pesquisa em biossensores de DNA tem aumentado significativamente. Estes sensores representam uma alternativa a PCR na detecção de sequências específicas de DNA, uma vez que exibem resposta rápida, baixos limites de detecção e requerem preparação simples da amostra. Nesta dissertação descrito o desenvolvimento de um biossensor para a detecção do DNA do Papilomavirus Humano tipo 18. A fim de imobilizar a sequência de captura de DNA em eletrodos de óxido de estanho e índio (ITO), realizou-se uma silanização usando 3-Aminopropiltrietoxisilano (APTES). A reação de silanização foi estudada e otimizada através das técnicas de Espectroscopia de Absorção Ultravioleta, Microscopia de Força Atômica, Microscopia de Fluorescência e Voltametria Cíclica. Após a imobilização, a hibridização com a sequência alvo é detectada através de alterações nas propriedades de superfície do eletrodo através de Voltametria Cíclica e Espectroscopia de Impedância Eletroquímica, usando o par redox Ferri-ferrocianeto. A detecção da sequência alvo sintética foi realizada no intervalo de 12.5 a 100 nM, e para o produto de PCR, 300 nM. O sensor não demonstrou resposta significativa para sequência não complementar a 50 nM. Este sensor pode ser aplicado na detecção rápida e de baixo custo de material genético do HPV a níveis nanomolares.
Pant, Bharat Raj. "A Comparative Study on P-type Nickel Oxide and N-type Zinc Oxide for Gas Sensor Applications." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1525473245395728.
Повний текст джерелаKasten, Oliver. "A state-based programming model for wireless sensor networks /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17397.
Повний текст джерелаZhang, Chengyang. "Toward a Data-Type-Based Real Time Geospatial Data Stream Management System." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc68070/.
Повний текст джерелаLee, Hyoung Chul. "On the development of a batch type inclusion sensor in liquid steel." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28479.
Повний текст джерелаAttempts have been made to extend the LIMCA technique to analyses of steel cleanliness. In order to commercialise the LIMCA system, a batch type probe, similar to an oxygen sensor, was developed and tested in low carbon steel melts.
For industrial applications, a series of experiments was carried out in a 60 ton tundish at DOFASCO. The data derived from these LIMCA measurements were compared to those obtained by DOFASCO personnel using the 'slime' technique for inclusion detection.
Sahner, Kathy [Verfasser]. "Modeling of p-type semiconducting perovskites for gas sensor applications / Kathy Sahner." Aachen : Shaker, 2006. http://d-nb.info/1166513262/34.
Повний текст джерелаShirzadfar, H., D. Kourtiche, R. Haraszczuk, M. Nadi, and S. Yamada. "Detecting and Estimating Magnetic Fluid Properties by a Needle- Type GMR Sensor." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34967.
Повний текст джерелаKnecht, Wolfgang. "On nonlinear filtering for noise reduction using a sensor array /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11052.
Повний текст джерелаRadhakrishnan, Praveen Kumar. "Stratified Arrays of Needle-Type Oxidation Reduction Potential Sensors." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250709803.
Повний текст джерелаMüller, Thomas. "An industrial CMOS process family for integrated silicon sensors /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13463.
Повний текст джерелаAvniel, Y. C. "Investigation of beta-alumina type electrolytes for use in high temperature sulphur detection." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338000.
Повний текст джерелаGassmann, Felix. "Elektrooptischer Sensor für die isotrope Messung des elektrischen und magnetischen Feldes /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11190.
Повний текст джерелаFrey, Urs. "High-density neural interface and microhotplate gas sensor in CMOS technology /." Zürich : Physical Electronics Laboratory, ETH Zürich, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17460.
Повний текст джерелаKocaman, Sultan Aksakal. "Sensor modeling and validation for Linear Array aerial and satellite imagery /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18120.
Повний текст джерелаSchneider, Michael Schneider Michael. "CMOS magnetotransistor and fluxgate vector sensors /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12746.
Повний текст джерелаPacitti, Elaine Grace. "The neuropharmacology of a slowly adapting type 1 sensory receptor." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/29930.
Повний текст джерелаAlbesa, Querol Joan. "Monitoring switch-type sensors and powering autonomous sensors via inductive coupling: application to removable seats in vehicles." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/101400.
Повний текст джерелаAlgunes aplicacions a l'entorn de l'automòbil no són possibles si no és mitjançant la connexió sense fils dels seus dispositius a causa que el cablejat és difícil o inviable. Alguns exemples els trobem en el monitoratge de sensors situats en parts rotatòries, com les rodes, o en elements extraïbles, com els seients. Els sistemes de monitoratge de la pressió de l'aire en les rodes (TPMS) són d'obligat compliment als EUA i ho seran en breu també als països membres de la UE per als vehicles de categories M1 o N1 aprovats a partir de l'1 de novembre de 2012 o per als vehicles matriculats a partir de l'1 de novembre de 2014. Actualment, els sistemes TPMS existents al mercat estan alimentats per piles. Amb tot, la vida útil exigida per a les bateries és d'uns 10 anys, esdevenint el seu ús un autèntic repte. Un altre element en contra de l'ús de bateries és la directiva 2006/66/CE que limita el nombre màxim permès en els vehicles. D'altra banda, moltes furgonetes o mini furgonetes i vehicles familiars incorporen seients extraïbles amb l'objectiu d'aprofitar al màxim l'espai interior. Alguns models comercials incorporen en el seient extraïble el detector de cinturó de seguretat. Per evitar el cablejat, existeixen sistemes de detecció passiva mitjançant acoblament inductiu. A partir del present any 2012, una regulació de la agència nord-americana NHTSA requereix de l'ús de coixins de seguretat intel·ligents per minimitzar els riscos en nens. Aquests seients intel·ligents haurien de detectar si el passatger és un adult, una cadira infantil o si està lliure per evitar problemes ocorreguts en anterioritat amb els sistemes coixí de seguretat. Els sensors usats per a aquests coixins de seguretat intel·ligents requeririen d'energia per operar. Una opció per als seients extraïbles és la transmissió de potència via acoblament inductiu des del terra del xassís del vehicle fins al seient. També és possible usar l'acoblament inductiu per detectar l'estat de diversos sensors existents en els seients extraïbles mitjançant detecció passiva. Precisament, la detecció d'ocupació i de cinturó de seguretat en seients extraïbles ha estat seleccionada per aplicar la investigació present que consisteix, d'una banda, en el monitoratge de sensors de tipus commutat (dos possibles estats) via acoblament inductiu i, per una altra, en la transmissió mitjançant el mateix principi físic de la potència necessària per alimentar els sensors autònoms remots. En els dos casos, una primera bobina es fixaria en el seient extraïble, connectada als sensors, i una segona bobina se situaria sota la primera, en el terra del vehicle.
Knüsel, Philipp. "Dynamic neuronal representations of static sensory stimuli /." Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16660.
Повний текст джерелаBrzeska, Malgorzata Dominika [Verfasser]. "RF Modelling and Characterization of Tyre Pressure Sensors and Vehicle Access Systems / Malgorzata Dominika Brzeska." Karlsruhe : KIT Scientific Publishing, 2015. http://www.ksp.kit.edu.
Повний текст джерелаZheng, Wei-Ding, and 鄭惟頂. "Liquid refractive index measurements by uses of D-type multi-mode fiber sensors and the ATR prism type sensor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/8e7s4a.
Повний текст джерела國立虎尾科技大學
光電與材料科技研究所
97
In this study, we propsed two methods for liquid refractive index measurements by uses of D-type multi-mode fiber sensors and the ATR prsim type sensor. 1. A multi-mode D-type optical fiber sensor based on the surface plasmon resonance(SPR), attenuated total reflection(ATR) and using optical spectrum analyzer method is presented. It is coated with an Au-film layer with a thickness of 20~50nm to detect the refractive variation of a liquid by measuring the output spectrum. Calculation of the reflectance ratio of the specimen, compared to water, enables determination of the resonant wavelength and the refractive index. The proposed method is used to enhance the measurement sensitivity and achieve a resolution to 5.2×10-7(RIU). 2 Being different with the usual SPR prism type sensor, a novel measurement system based on attenuated total reflection(ATR) with S polarization was built up in our Lab. For measuring the liquid refractive index, we used five-layers ATR sensors to simulate its attenuated angles corresponding different refractive index liquid and the best coating thickness. Comparing the resoulation between S- and P-polarizations, the S-polarized ATR sensor is better than the P-polarized SPR sensor, and the resoulation can achieve to 1.89×10-6 (RIU). The results exhibits that is feasibility to use S-polarization for measurement.
Tang, Shao-En, and 唐紹恩. "Photo-sensor Type Touch Panel System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/49787554456241323027.
Повний текст джерела國立臺灣大學
電機工程學研究所
96
Touch Panel Integration on Glass is a new proposal for recent display technology. The way to produce is to add photo-sensor structure in TFT Pixel Array, then to integrate touch panel function into 15 inch a-Si TFT-LCD panel, and to enable the display panel with Light-Pen Input Display or Finger Sensing Input Display function. We embedded a-Si photo sensors every 4 lines of gate lines and data lines into 15 inch LCD panel with resolution of XGA 1024x768 to let the sensor line resolution to reach 256x192. Either use fingers to block the light or use the light pen to put the strong light on the touch panel, we allow the touch panel create movements. When use fingers to block the ambient light it will have analog signal output, then through ADC to transfer analog signal to digital signal which is acceptable by computers. FPGA provides timing chart to analog board, through SPI interface to C8051, then through USB convey to PC, and the software touch control drivers in the computer will integrate all the components and edit them to calculate, finally show the position that users been touched on the screen. The biggest advantage of photo-sensor touch panel is to lower the cost, improve the transmittance, long lasting, reduce the thickness, and improve the calibration problems of capacitive touch panel.
Tang, Shao-En. "Photo-sensor Type Touch Panel System." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-0707200816414300.
Повний текст джерелаLIANG, BO-HAO, and 梁博皓. "Pyroelectric-type entropy sensors." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/352525.
Повний текст джерела國立虎尾科技大學
機械設計工程系碩士班
106
In energy transformation systems, output energy is the most goal for increasing yield, consequently energy efficiency must be maximized. Entropy is a common parameter in chemical reactions, thermodynamic, biology and materials science, because energy loss is directly related to entropy generation. However, entropy generation in irreversible processes is difficult to be monitored in real time. Entropy can be an estimator for describing the failure and ageing of chemical, electrical or mechanical systems. The entropy rate can be derived from the induced pyroelectric current, temperature, thermal capacity, pyroelectric coefficient and electrode area. In the present study, a pyroelectric type entropy sensor is developed to evaluate entropy variation and rate while bulk PZT materials are fabricated with various thicknesses and dimensions by MEMS micromanufacture processes with a dicing saw and a sandblast etching machine. The entropy sensors are further applied to monitor capacitors for predicting they lifetime. The results show that increasing the PZT dimension raises the entropy variation. The increment of entropy variation is proportional to the volume of PZT cells. A PZT square with a 10 mm side length generates the entropy variation about 25 times than that of a 2 mm side length under the same PZT thickness of 100 μm. A PZT cell with a smaller volume cannot disturb the entropy generation of the measured objects, but the smaller electrode area can reduce the induced current and electrical signals increasing the difficulty in measurement. Moreover, the pyroelectric type entropy sensors are also successful to appraise the critical failure time in capacitors. The critical time is about 7.5s, 11.2.5s, 22.5s for the input voltage of 40V, 35V, 30V respectively while the commercial capacitor possesses the capacitance of 47μF and the maximum educed voltage of 4V.
黃帥凱. "On the Improvement of Catalystic Type YSZ CO Sensor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/57738375592283667502.
Повний текст джерела國立臺灣科技大學
化學工程系
92
Abstract The purpose of this study intends to obtain a better catalytic type YSZ CO sensor with shorter response time. The improvement was achieved by the following methods including changing the thickness of catalyst layer, printing different concentrated YSZ powder on electrode , doping different metal oxide into YSZ and changing calcinations time for the solid state electrolyte. SEM,XRD,ESCA and AC impedance were employed to characterize the catalyst layer and electrode. The influences of operating temperature and applied potential on the sensing were also studied. Based on the SEM, XRD and ESCA spectra, it was found that both Pt electrode and Cu/Zn catalyst layer were sintered after a long period operation. AC impedance analysis indicated that among all doing YSZ electrolyte the one doping with 1.0 wt% Sr gives the best oxygen ion conductivity. CO sensing data reveal that the best CO sensor with shortest response time(40-80 sec) is the one with printing 0.5 concentrated YSZ powder on electrode companying with doping 1.0 wt% Sr into YSZ. The experimental results also indicate that the sensitivity of the sensor can be improved by raising operating temperature as well as applied potential. The sensitivity would be raised from 0.0005 to 0.0033 μA/ppm CO when the operating temperature increase from 550 to 650℃,and from 0.0011 to 0.0027μA/ppm CO as applied potential increased from -0.5 to -1.0V.
Chang, Kun-Hui, and 張琨揮. "A Current-type Gas Sensor Based on Substituted Phthalocyanines." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/70258850124782338191.
Повний текст джерела國立臺灣科技大學
化學工程系
90
Two substituted metallo-phthalocyanines, i.e. Copper(Ⅱ) 2, 9, 16, 23-tetra- tert-butyl-29H, 31H-phthalocyanine (CuttbPc) and Copper (Ⅱ) 3, 10, 17, 24- tetra-tert-butyl-1,8,15,22-tetrakis(dimethylamino)-29H, 31H-Phthalocyanine (CuttbtPc) were spin-coated onto alumina and fabricated into sensors for the detection of pollutant gases. The effects of operating parameters such as spinner speed, film thickness, substrate concentration, temperature and heat treatment on the sensing behavior were systematically investigated. It was found that the steady sate current of the CuttbPc sensor increases with the increase of SO2 concentration, operating temperature and film thickness. This sensor possesses satisfactory stability and reproducibility toward sensing SO2. Heat treatment profoundly affects the sensing characteristics of CuttbPc. While CuttbtPc, due to its strong electron-donating group which decreases the energy gap, can sense SO2 at a lower temperature of 90℃, as compared to 120℃ for CuttbPc.
耿培倫. "Experiment in Water Level Measurment Using Resistent Type Sensor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/28818031222840235151.
Повний текст джерела逢甲大學
土木工程學系
101
The observation instruments in water level measurement was restricted by different environments and setting patterns. To measure level and depth of water, the study had been designed 30 groups of resistent type sensors with combination of 5 negative electrodes, 2 types of screw cap and 3 electrode gaps. It was found that the use of resistent type sensor was effective in water level measurement. According to the experimental results, the readings of resistance value between 820-830 showed that the measurement position was between the air and water. The stability of measurement was not affected by material and space of electrode gaps. The assessment results of experiment showed that ; 1.Discrimination in water interfaces can be correctly identified by using average method. 2.The recognition rate of discrimination in simulated river bed material was 97%. The experimental group A.N20, B.N10 and D.N2 showed high efficacy in water depth measurement using resistent type sensors. Keyword:Water level measurement, Water depth measurement Water level Sensor, Water Monitoring Systems.
Tsai, Yan-Ying, and 蔡衍穎. "Investigation of Schottky Contact-Type Hydogen Sensors." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/66388166434655362685.
Повний текст джерела國立成功大學
微電子工程研究所碩博士班
96
In this dissertation, a series of Schottky contact-type hydrogen sensors are proposed. By using the catalytic metals (Pd or Pt) as the gate materials, the hydrogen molecules will be dissolved as hydrogen atoms. Part of those hydrogen atoms will diffuse through the metal bulk and adsorb at the metal-oxide or metal-semiconductor interface. Those adsorbed hydrogen atoms will be polarized to form a dipolar layer. Due to the presence of this dipolar layer, the significant changes in current-voltage characteristics of the studied devices are found. Experimentally, the studied hydrogen sensors can work in a low hydrogen concentration, high operating temperature, and wide hydrogen concentration range environments. Also, a short response time is observed in real-time applications. These results demonstrate the promise of the studied devices to perform as fast-responsive and sensitive hydrogen sensors over a broad range of operating temperature. In chapter 2, the Pt-InAlP metal-oxide-semiconductor and metal-semiconductor Schottky diode hydrogen sensors with high-sensitive hydrogen detection among wide operating temperature regime are comprehensively studied and compared. Experimentally, both the hydrogen sensors can be operated systematically under bi-polarity biases. In addition, it is worth to note that even an extremely low hydrogen concentration of 4.3 ppm H2/air can be effectively detected at the temperature of 30~250oC. The detecting sensitivity of the MOS-type hydrogen sensor is superior to that of the MS-type. It is believed that a high-quality oxide layer effectively increases the amount of hydrogen atoms adsorbed. Also, the hydrogen effects are found on both the Schottky barrier height lowering and the modulation in the electric field at the Pt-oxide and Pt-InAlP interfaces. In chapter 3, hydrogen sensing properties of a Pt-oxide-GaN metal-oxide-semiconductor-type Schottky diode is demonstrated and studied. In the hydrogen-containing environment, the shift of current-voltage curves and decrease of turn-on voltage Von are found to be caused by the lowering of Schottky barrier height. Also, the corresponding series resistance Rs is decreased from 191.8 (in air) to 155.3 Ω (under a 9970 ppm H2/air gas) at 30oC. As the carrier gas is replaced by a nitrogen gas, a significant variation of 0.32 V and 19.56 Ω in Von and Rs values are obtained at 30oC, respectively, even at an extremely low hydrogen concentration of 4.3 ppm H2/N2. Since the oxygen atoms will be dissolved on the Pt metal surface and react with hydrogen atoms by the formation of hydroxyl and water, the amount of adsorbed hydrogen atoms on the Pt surface is reduced. Moreover, the shorter response time constant and the larger initial rate of current density variation are found even at room temperature. In chapter 4, an interesting transistor-type hydrogen sensing detector based on GaAs pseudomorphic high electron mobility transistor with a Pd/Al0.24Ga0.76As metal-semiconductor Schottky gate structure is fabricated and investigated. The significant modulations in electrical signals are observed obviously due to the adsorption of hydrogen atoms at Pd-semiconductor interface. The corresponding adsorption and desorption time constants (�跾 and �踀) are 2.5 and 6 sec, respectively, under a 9970 ppm H2/air gas at 160oC. Theoretically, the dipolar layer formed by the hydrogen atoms adsorbed at the Pd-AlGaAs interface can be considered as a two-dimensional layer. The simulated curves show excellent agreement with experimental results. In addition, an anomalous decrease phenomenon in transient response is observed, which may be caused by the formation of hydroxyl species and water. Consequentially, the studied device provides the promise for GaAs integrated circuit and micro electric and mechanic system applications. In chapter 5, the interesting hydrogen sensing characteristics of two transistors with an Al0.24Ga0.76As (device A) and In0.49Ga0.51P (device B) Schottky layer are demonstrated. Experimentally, device A shows a lower hydrogen detection limit of 4.3 ppm H2/air, a higher current variation of 7.79 mA and a shorter adsorption time of 10.95 s in a 9970 ppm H2/air at room temperature. On the other hand, device B exhibits more stable hydrogen-sensing characteristics at high temperatures. In addition, the transient hydrogen sensing phenomenon of device A is studied. In an N2 environment, the sensing signal is proportion to the logarithmic values of hydrogen concentration at temperature from 30 to 160oC. Due to the higher activation energy for initiating the reverse hydrogen release process, the current-response of hydrogen-detecting signal is always not recovered back to the original baseline level. At higher temperature, the recovering curve can be divided into three regions: (i) initial, (ii) accumulation, and (iii) revival stages. Because the recombination process of hydrogen atoms is slower, larger amount of desorbed hydrogen atoms are accumulated on the Pd metal surface which results in the longer desorption time. However, the higher speed desorption phenomenon is observed in the presence of oxygen. In chapter 6, a back-end amplifying integrated circuit is designed and fabricated. The output amplifying circuit is composed of three electronic devices including the decoder, CMOS transmission gate switch, and operational amplifier. Several input sensing signals can be introduced simultaneously and controlled by the decoder and switch. One of these input sensing signals can pass through the switch, and the output signal of the sensing signal is amplified.