Dissertations / Theses on the topic 'Microsensor'
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Oldenziel, Weite Hendrik. "Application of a glutamate microsensor to brain tissue construction, evaluation and application of a glutamate microsensor /." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/297660691.
Full textByun, Albert Joonsoo. "Chemical Application of Silicon-Based Resonant Microsensor." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16296.
Full textTang, David 1977. "Rotor speed microsensor for the MIT Microengine." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8554.
Full textIncludes bibliographical references (p. 123-127).
This thesis presents the design, fabrication, and testing of a temperature-based sensor for measuring rotor speeds in the MIT MEMS micro gas turbine engine. The MIT microengine is a gas combustion engine made by micromachining and bonding six silicon wafers. The sensor is a boron-doped polysilicon resistor with a serpentine geometry that is thermally isolated from the substrate. The sensor is designed to measure the rotor rpm by responding to the heat flux fluctuations on the wall above the compressor blade tips. This thesis investigates the feasibility of this approach. The sensor development process involved fabricating stand-alone devices (which have only the sensor and contact pads and not integrated with other microengine components) and testing them using a furnace and a shock tube. The furnace test characterized the stability with thermal cycling and annealing. The shock tube test characterized the dynamic response. The temperature coefficient of resistivity (TCR), 0.009/K , and the room temperature resistance, ~9 kohms, measured in the furnace characterization experiments were approximately 50% less and 300% more than the predicted values, respectively. These discrepancies may be due to the fabrication process conditions, such as ion implant dose, polysilicon deposition temperature, and anneal conditions. The time constant, 9-10 [mu] sec, measured from the shock tube experiments matched predicted values to within 20-40% depending on the model used to estimate the convective heat flux into the sensor. However, the sensor's amplitude response was less than predicted values by approximately 10 - 75% perhaps due to the simplicity of the models used to estimate the convective heat flux. The experimental results suggest that this concept is viable as a microengine rpm sensor. Some design changes are suggested which should improve sensor performance.
by David Tang.
S.M.
Kim, Ho-Young 1971. "Microsensor development for the study of droplet spreading." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40244.
Full textAdams, Douglas Edward. "A high resolution capacitance-based lateral position microsensor." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/46050.
Full textShih, Eugene Inghaw 1976. "An energy-efficient radio for wireless microsensor networks." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86763.
Full textIncludes bibliographical references (p. 139-142).
by Eugene Inghaw Shih.
S.M.
Phanaphat, Piyada 1978. "Protocol stacks for power-aware wireless microsensor networks." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8076.
Full textIncludes bibliographical references (p. 71-72).
In a distributed wireless sensor system, a need to prolong the lifetime of the network is crucial and limited by battery capacity. As communication traffic among sensor nodes is triggered by sensing events, the network can exploit these time-varying scenarios to obtain power savings by adjusting its operating conditions accordingly. A coherent design of application-specific network protocol stacks is the key. Specifically, embedding power aware features in the link layer and media access control (MAC) layer promises to extend the lifetime of the sensor network. The power-aware design will be illustrated on [mu]AMPS sensor node prototypes. With the integrated design framework, lower layers of the network stack provides configurable power-aware features to be controlled by higher network layers that maintain broaderview knowledge of the environment. TDMA has been chosen as a MAC Layer protocol for its inherited power-aware mechanism of radio shutdowns outside its TDMA slot and in absence of sensing events. Another level of power-aware features can be deployed in MAC ID and TDMA slot assignments. In a field of scattered sensor nodes, not all the nodes are in radio range of one another or of the base station. Hence, assigning N TDMA slots for the network of N sensor nodes that are not all in radio range will waste the receiver energy and link bandwidth. An algorithm for a re-use of MAC ID and MAC time slot is proposed based on the number of neighboring nodes. Hence, varying the number of neighboring nodes by varying the transmit power can optimize the system lifetime and bandwidth. An implementation of the Link and MAC infrastructure is completed. Power scalability is illustrated on [mu]AMPS node prototypes, with TDMA Media Access and a vehicle tracking application demonstration.
by Phanaphat Piyada.
M.Eng.
Wang, Andrew Yu 1976. "Base station design for a wireless microsensor system." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86627.
Full textHager, Jonathan M. "Development and calibration of a heat flux microsensor." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44640.
Full textMaster of Science
Lartz, Douglas John. "Feedforward temperature control using a heat flux microsensor." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06302009-040309/.
Full textDu, Hongtao. "Energy-constrained microsensor platform on-board image processing." Saarbrücken VDM Verlag Dr. Müller, 2007. http://d-nb.info/985423781/04.
Full textDaly, Denis Clarke. "An energy efficient RF transceiver for wireless microsensor networks." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34111.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 81-86).
A wireless microsensor network consists of a group of sensor nodes that are deployed remotely and used to relay sensing data to the end-user. Due to their remote deployment, large scale wireless sensor networks require a low-power, energy efficient transceiver that can operate for years on a single battery. Existing wireless transceivers designed for low-power wireless standards like IEEE 802.15.4 have difficulty meeting such stringent energy requirements. Thus, a custom on-off keying wireless transceiver for sensor networks has been designed in a 0.18-[micro]m CMOS process. Power savings are achieved by using an envelope detection based architecture that leverages SAW components and through advanced circuit techniques. The transceiver is power-aware, able to scale power consumption in response to operating conditions. Circuit optimizations are made in both high frequency and baseband circuits to minimize the number of off-chip components and to achieve optimal energy efficiency. A thorough comparison of radio-frequency tuned and untuned gain stages shows that untuned gain can offer energy efficiency advantages in many situations. The transceiver operates in the 900 MHz ISM band at a data rate of 1 Mbps. The receiver's sensitivity is scalable from -37 dBm to -71 dBm with power consumption ranging from 500 [micro]W to 2.4 mW.
(cont.) These power levels correspond to an energy per bit ratio of 0.5 to 2.4 nanojoules per bit, more than ten times smaller than the ratio of typical wireless receivers. The transmitter supports output power levels from -10 dBm to -1 dBm and has a maximum power efficiency of 11%.
by Denis Clarke Daly.
S.M.
SIPPOLA, CLAYTON BRADLEY. "A CERAMIC CAPACITIVE PRESSURE MICROSENSOR WITH SCREEN-PRINTED DIAPHRAGM." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1146761953.
Full textSeo, Jae Hyeong. "Silicon-Based Resonant Microsensor Platform for Chemical and Biological Applications." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19835.
Full textMarzioch, Julia [Verfasser], and Gerald A. [Akademischer Betreuer] Urban. "Microsensor system for the metabolic monitoring in cancer cell culture." Freiburg : Universität, 2019. http://d-nb.info/118713337X/34.
Full textKirshenblatt, Stacey Jenna. "Microsensor technology to evaluate patient adherence with removable oral appliances." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46921.
Full textIckes, Nathan J. (Nathan Jeffrey) 1979. "Hardware and software for a power-aware wireless microsensor node." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8080.
Full textIncludes bibliographical references (p. 143-144).
This thesis examines important issues in the design of hardware and software for microsensor networks, with particular attention paid to mechanisms for providing power awareness. The [mu]AMPS Revision 1 microsensor node is used as an example. The design of this node implementation is described in detail, including, in particular, the design of the pAMPS processor board and its power-scalable architecture. The operating system and application programming interface for the node is described. Finally, an analysis is made of the power consumed by each of the node's subsystems, and these results are used to assess the degree of power-awareness provided by the [mu]AMPS Revision 1 node.
by Nathan J. Ickes.
M.Eng.
Demirci, Kemal Safak. "Chemical microsystem based on integration of resonant microsensor and CMOS ASIC." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41182.
Full textAbercrombie, Matthew G. "Acoustic microsensor with optical detection for high-temperature, high-pressure environments." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19467.
Full textAl-Khalifa, Sherzad. "Identification of a binary gas mixture from a single resistive microsensor." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/52652/.
Full textWang, Andrew Yu 1976. "Lower power RF transceiver modeling and design for wireless microsensor networks." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33930.
Full textIncludes bibliographical references (p. 97-102).
The design of wireless microsensor systems has gained increasing importance for a variety of civil and military applications. With the objective of providing short-range connectivity with significant fault tolerance, these systems find usage in such diverse areas as environmental monitoring, industrial process automation, and field surveillance. The main design objective is to, maximize the battery life of the sensor nodes while ensuring reliable operations. To achieve this goal, the microsensor node has to be designed in a highly integrated fashion and optimized across all levels of system abstraction. For microsensor networks, the RF transceiver dominates the power consumption. The concept of transceiver power efficiency is introduced, which defines the ratio of RF transmit power to transceiver electronics power, to show that short-range RF transceivers have low transceiver power efficiency. A system energy model is developed to show that the battery life of the transceiver not only depends on its power consumption, but more importantly, on its energy dissipation over the operation cycle.
(cont.) Both the transceiver power efficiency and the battery life can be improved significantly by increasing the data rate, reducing the start-up time, and improving the PA efficiency. Increasing the data rate drives down the fixed energy cost of the transceiver. Reducing the start-up time decreases the start-up energy overhead. Improving the PA efficiency lowers the energy per bit cost of the power amplifier. The voltage controlled oscillator occupies a large fraction of the total energy budget in the operation of the microsensor transceiver. The design of integrated LC oscillators is investigated on both the system and the circuit design levels. On the system level, the phase noise requirement of the VCO as a function of the channel bandwidth and the data rate is derived. On the circuit level, the physical mechanisms of phase noise are examined and a low-power 5-GHz VCO is designed and fabricated in a 0.18-[mu]m SiGe BiCMOS process. A technique is proposed to trade off phase noise for a lower bias current through the sizing of the switching transistors. This VCO demonstrates a phase noise of -125dBc/Hz at 7mA core bias current and -llOdBc/Hz at 1.5mA, which exceeds the system phase noise requirement.
by Andrew Yu Wang.
Ph.D.
Peabody, Hume L. "Evaluation of a Heat Flux Microsensor in a Transonic Turbine Cascade." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35495.
Full textMaster of Science
Ono, Alexandre Fernandes. "Estratégias de operação de reatores aeróbio/anóxico operados em batelada sequencial para remoção de nitrogênio de água residuária industrial." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-18092007-100009/.
Full textThe purpose of this research was to evaluate the performance and the behavior of sequential batch reactors with suspended and immobilized biomass, in benches scale, for the nitrogen composite removal. Such systems had been tested as sulphetogenic and methanogenic reactors complementary treatment, used in an industrial waste water treatment with high sulphate and ammonia concentrations. The research aimed for the development of an operation strategy that could make possible the use of the proper waste water constituent for the improvement of the treatment efficiency. The study was divided into 3 main stages. In stage 1 (181 days of operation), the reactor with suspended biomass was kept with 4 alternating phases aerobic/anoxic and a 24-hour cycle was used, and the endogenous denitrification was verified (nitrogen removal efficiency of 65 \'+ OU -\' 27%). For stage 2 (127 days of operation), the suspended biomass reactor was submitted to a cycle of 12 hours, with an aerobic phase (6 hours) and posterior anoxic phase (6 hours). In this stage effluent of the methanogenic and sulphetogenic reactors, rich in volatile acid (acetic acid), was added to accelerate the denitrify process. The achieved results had been low in terms of nitrogen removal(42 \'+ OU -\' 21%). For stage 3 (134 days of operation), some supports media was tested through dissolved oxygen microsensors technique, in order to check the specific biofilm formation (nitrificant/denitrificant) and the mineral coal was opted to be used in the immobilized biomass reactor. In this last stage it was adopted an operational strategy similar in stage 2 (12 hours cycle), as well as the addition of part of the affluent in the anoxic phase. The nitrogen removal, with aerobic and anoxic periods and 12 hours cycle, revealed feasible in the reactor with immobilized biomass (nitrogen removal efficiency of 72 \'+ OU -\' 13%). In the end of the experimental tests, kinetic modelings were done and had allowed the understanding of conventional and not conventional processes occurred in the stages for nitrogen removal, such as desnitrification in aerobic phase and ANAMMOX process.
Michener, Michael Douglas. "Measurements of thermal properties and blood perfusion using the heat flux microsensor." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/41696.
Full textMaster of Science
Beach, Elvin R. III. "Picoliter Drop Deposition of Oxide Nanoparticles: A Route to High Performance Microsensor Arrays." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1249675063.
Full textKieninger, Jochen [Verfasser], and Gerald A. [Akademischer Betreuer] Urban. "Electrochemical microsensor system for cell culture monitoring = Elektrochemisches Mikrosensor-System zum Zellkultur-Monitoring." Freiburg : Universität, 2012. http://d-nb.info/1114995657/34.
Full textSödergren, Simon. "Electrochemical microsensor with in-situ fabricated Ag/AgCl reference electrode for high-pressure microfluidics." Thesis, Uppsala universitet, Mikrosystemteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-330913.
Full textChawich, Juliana. "ZnO/GaAs-based acoustic waves microsensor for the detection of bacteria in complex liquid media." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD012/document.
Full textThis thesis was conducted in the frame of an international collaboration between Université de Bourgogne Franche-Comté in France and Université de Sherbrooke in Canada. It addresses the development of a miniaturized biosensor for the detection and quantification of bacteria in complex liquid media. The targeted bacteria is Escherichia coli (E. coli), regularly implicated in outbreaks of foodborne infections, and sometimes fatal.The adopted geometry of the biosensor consists of a gallium arsenide (GaAs) membrane with a thin layer of piezoelectric zinc oxide (ZnO) on its front side. The contribution of ZnO structured in a thin film is a real asset to achieve better performances of the piezoelectric transducer and consecutively a better sensitivity of detection. A pair of electrodes deposited on the ZnO film allows the generation of an acoustic wave propagating in GaAs under a sinusoidal voltage, at a given frequency. The backside of the membrane is functionalized with a self-assembled monolayer (SAM) of alkanethiols and antibodies anti-E. coli, providing the specificity of detection. Thus, the biosensor benefits from the microfabrication and bio-functionalization technologies of GaAs, validated within the research team, and the promising piezoelectric properties of ZnO, to potentially achieve a highly sensitive and specific detection of the bacteria of interest. The challenge is to be able to detect and quantify these bacteria at very low concentrations in a complex liquid and/or biological sample.The research work partly focused on the deposition and characterization of piezoelectric ZnO thin films on GaAs substrates. The effect of the crystalline orientation of GaAs and the use of a titanium / platinum buffer layer between ZnO and GaAs were studied using different structural (X-ray diffraction, Raman spectroscopy, secondary ionization mass spectrometry), topographic (atomic force microscopy), optical (ellipsometry) and electrical characterizations. After the realization of the electrical contacts on top of the ZnO film, the GaAs membrane was micromachined using chemical wet etching. Once fabricated, the transducer was tested in air and liquid medium by electrical measurements, in order to determine the resonance frequencies for thickness shear mode. A protocol for surface bio-functionalization, validated in the laboratory, was applied to the back of the biosensor for anchoring SAMs and antibodies, while protecting the top side. Furthermore, different conditions of antibody grafting such as the concentration, pH and incubation time, were tested to optimize the immunocapture of bacteria. In addition, the impact of the pH and the conductivity of the solution to be tested on the response of the biosensor has been determined. The performances of the biosensor were evaluated by detection tests of the targeted bacteria, E. coli, while correlating electrical measurements with fluorescence microscopy. Detection tests were completed by varying the concentration of E. coli in environments of increasing complexity. Various types of controls were performed to validate the specificity criteria. Thanks to its small size, low cost of fabrication and rapid response, the proposed biosensor has the potential of being applied in clinical diagnostic laboratories for the detection of E. coli
Siman, Renato Ribeiro. "Reator de leito expandido em escala plena com zonas anaeróbia e aeróbia sobrepostas: remoção conjunta de matéria orgânica e nutrientes e estudo do comportamento microbiológico do biofilme, por respirometria e microsensor de OD." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-31102008-151843/.
Full textThe current research aimed the development of a 159 \'M POT.3\' total volume biological reactor, with a expanded and partially aerated granular coal bed (activated and anthracite), to promote organic matter and nutrients (N and P) removal from wastewater due to the maintenance of anaerobic and aerobic environments, stratified throughout the height of the reactor and also all over the biofilm cultivated in its interior. Methods for the analyses of specific nitrifying activities (ENA), denitrifying (EDA) and methanogenic (EMA) were applied to assess the impact of the operational modifications in the biological behavior of microorganisms present in the reactor, based on standard respirometric tests found in literature. The reactional stratification was also studied inside the biological films with the help of DO microsensors in batch tests. Thus, after 451 of operation it was possible to verify mean \'COD IND.F\', TNK and phosphate removal of 78%, 56% and 42%, respectively, when the reactor was operated for 66 days with average hydraulic detention time of 8.8 h, pure oxygen injector which was installed after the aerated recirculation line which was working pressurized (3 to 4 bar) and with mean recirculation ratio equal to 3, when compared to the feeding flow. For the rest of the period where mean volumetric loading rates of 0.74 \'+ OR -\' 0.28 kg\'COD IND.F\'/\'M POT.3\'.day; 0.17 \'+ OR -\' 0.07 kgTNK/\'M POT.3\'.day and 0.05 \'+ OR -\' 0.02 kg\'PO IND.4\'POT.-3\'/\'M POT.3\'.day were applied the system demonstrated average removal of 65 \'+ OR -\' 20% for \'COD IND.F\', 25 \'+ OR -\' 21% for TNK and 48 \'+ OR -\' 18% for total phosphate, even when it operated with mean cellular retention time of 15 \'+ OR -\' 7 days. The respirometric tests were sensible enough to assess the microbial activity from the biological material collected throughout the reactor, and where mean PME of 0.25 mL\'CH IND.4\'/gSVT.h was verified for the samples of biological material collected in the anaerobic region, at the bottom of the reactor; ANE varying between 1.3 to 4.4 mg\'O IND.2\'/gSVT.h, for the samples collected in the aerobic region, reactor\'s intermediary; and ADE varying between 0.024 to 5.20 mg\'N IND.2\'/gSVT.h, for samples collected at the bottom and the top of the reactor, respectively. The analyses of the liquid material also support the idea of stratification of the aerobic environments, at the bottom of the reactor, and micro-aerated, in its superior intermediate region, pointing to the region as a high potential of occurring joint nitrification and denitrification at the top of the reactive zone. The DO amperometric microsensor, with tip between 10 and 30 \'mü\'m of diameter, produced in a special laboratory, is sensible to the determination of dissolved oxygen concentration gradient inside biological film, sufficient for the formation of anaerobic and aerobic regions in its interior, this information can be useful to the improvement of biofilm reactors, projected for the combined removal of organic matter and nutrients. However, when the definition of kinetic parameters or mass transference is intended more strictness must be applied when choosing the locals for microsensor application, where the effects of the microbial aggregate heterogeneity is reduced in the adjustment of the mathematical modeling applied to the experimental points.
Yi, Chen. "Development of a diffusional microtitration device and a carbon fiber microsensor for potential drug influx/efflux studies on single cancer cell." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058284676.
Full textSpratley, Jon Peter Frederick. "mechanical design of an injectable microsensor for neural connection within the motor cortex of the human brain." Thesis, University of Birmingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.532287.
Full textLI, CHUNYAN. "A SPIRALLY-ROLLED FLEXIBLE POLYMER TUBE INTEGRATED WITH MICROSENSORS AND MICROFLUIDIC DEVICES FOR MULTIFUNCTIONAL SMART MICROCATHETERS." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196111658.
Full textSuzuki, Takeharu, and n/a. "Integrated, Intelligent Sensor Fabrication Strategies for Environmental Monitoring." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040813.131206.
Full textSuzuki, Takeharu. "Integrated, Intelligent Sensor Fabrication Strategies for Environmental Monitoring." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367295.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Microelectronic Engineering
Full Text
Neumann, Hendrikje Marie [Verfasser]. "Prototyping of a Surface-integrated Mechano-optical Microsensor System for 3D Traction Force Measurements by DHM/DIC / Hendrikje Marie Neumann." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1197612440/34.
Full textRohtlaid, Kätlin. "Fabrication, caractérisation et intégration de microactionneurs et de microcapteurs à base de polymères conducteurs électroniques." Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG1029.
Full textElectroactive polymers (EAPs) are able to change their shape and/or size in response to electrical stimulation, but also to generate electrical signal in response to mechanical stimulation. As flexible, and lightweight materials, they arise as promising candidates for the development of soft Micro-Electro-Mechanical Systems (MEMS) to move towards soft electronics. The goal of this thesis is the fabrication and characterization of microactuators and microsensors based on electronically conductive polymers (ECPs) to obtain efficient devices for further integration into microsystems.The recently elaborated Layer-by-Layer (LbL) process for fabricating ECP based microactuators was taken as a starting point of this thesis. The optimization of vapor phase polymerization of 3,4-ethylenedioxythiophene (EDOT) was studied in order to improve the electrical and electrochemical properties of the electrodes and as a result, the microactuators performances.As a next step, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) was chosen as a new electrode material to develop more simple and reproducible LbL process. Polar reactive additives based on poly(ethylene oxide) (PEO) were incorporated to the PEDOT:PSS commercial dispersion to elaborate electrodes with improved electrical, mechanical and electrochemical properties. These PEDOT:PSS composite electrodes were then used to fabricate efficient trilayer microactuators. Additionally, the mechanical strain sensing of these trilayers was demonstrated for the first time on microscale.The integration of these PEDOT:PSS based microactuators was then performed according to a process fully compatible with microsystems. The process describes for the first time the complete elaboration of the trilayer microdevices, their full integration with electrical connections and subsequent operation on a flexible substrate without any manual handling, allowing the design of microsystems with complex configurations. The resulting microsystems were successfully characterized as microactuators and as microsensors.Finally, air-operating linear actuators have been developed by the combination of PEDOT:PSS based electrodes with different physical properties as predicted by a theoretical model. The electrochemical and mechanical properties of PEDOT:PSS based electrodes were first studied as a function of their composition but also of their the redox level. Best combination of electrodes was used to develop asymmetrical trilayer devices with simple LbL process. The resulting devices presented linear actuation with performances in the range of predicted values. Linear strain sensing ability of these materials was also demonstrated.The work of this thesis demonstrated a simple and reproducible elaboration method for fabricating PEDOT:PSS based microactuators and microsensors with high performances. The developed microfabrication process allows their full integration into microsystems and brings them closer to the development of soft and efficient ECP-MEMS
Le, Borgne Brice. "Microcapteurs chimiques basés sur des couches nanométriques de silicium polycristallin : application à la détection de plomb." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S118/document.
Full textThe aim of this research work is to implement a lead ions sensor based on polycrystalline silicon nanostructures. This material has been intensively studied by electrical and physical characterization. This study showed that structures such as polysilicon nanoribbons or nanowires have poor crystalline quality but satisfying enough electrical properties to be used as a sensor sensible elements. Nanoribbons have been functionnalized by spontaneous grafting of diazonium salts that enable lead ions trapping at the surface of these nanoribbons. Thanks to the functionnalization, sensor reached a limit detection as low as 2.10-7 mol/L. These results prove that sensing lead ions is possible thanks to low-cost polysilicon nanostructures. Development of a gate-all-around transistor based on polycrystalline silicon nanowires is proposed in this manuscript. It could lead to increase sensibility of that type of microsensors
Perera, Reshani H. "Nitric Oxide Synthase in Confined Environments: Detection and Quantification of Nitric Oxide Released From Cells and Modified Liposomes Using a Sensitive Metal Catalyst-PEDOT Modified Carbon Fiber Electrode." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1297142093.
Full textLin, Qian. "A Plastic-Based Thick-Film Li-Ion Microbattery for Autonomous Microsensors." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1175.pdf.
Full textScaglia, Philipp, and Martin Zimdahl. "Treatment effects of van Beek activator comparing two wear-time prescriptions assessed by microsensors: a randomized clinical trial." Thesis, Malmö universitet, Odontologiska fakulteten (OD), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19730.
Full textAim: The aim of this study was to evaluate the compliance and overjet changes among patients treated with the van Beek activator comparing a twelve- and eight-hours daily wear-time prescription. Material and methods: The study sample consisted of thirteen patients (4 boys and 9 girls) with a mean age of 10.0 years (SD = 0.9). All patients had a Class II malocclusion and were treated with the van Beek activator. Patients were randomly assigned to two groups with a wear-time of twelve and eight hours respectively. Compliance was measured with the aid of a microsensor (TheraMon®) built into the activator and the overjet and overbite were recorded after the first, third and sixth month. Results: The mean decrease in overjet among the 8 hours group after six months was 3.4 mm compared to the 3.5 mm overjet reduction recorded in the 12 hours group. The mean wear-time in the 12 hours group and 8 hours group were 8.2 hours (SD = 1.7) and 7.9 hours (SD = 2.6) per day respectively. The overall mean daily wear-time of all patients in both groups was 8.1 hours. Conclusions: The eight-hours prescription was easier to achieve compared to the twelve-hours. The van Beek activator was effective in Class II correction, no clinically significant difference in treatment effect was observed between the two wear-time prescriptions.
Laithier, Virginie. "Microsystème fluidique de détection de gaz pour l'environnement." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4308/document.
Full textMy thesis work led to develop an innovative fluidic microsystem for gas detection. It is portable, cheap and has an integrated thermal pumping. The gas microsensor used is inserted into a microchannel. Its integrated heater allows the well detection. It also allows the creation of thermal creep phenomenon, which is at the origin of the gas flow along the channel which will be detected by the microsensor. The choices of both microchannel dimensions and the temperature gradient are the most important parameters. Thus, microfluidic and thermal simulations were performed to define the microchannel dimensions and the most suitable materials natures. Two microsystems were processed with clean room technologies. The integrated heater was calibrated to study the real thermal gradient. A study of the performance of the microsensor was performed under ammonia. We could include determining the optimal temperature sensing. Then the microsystem was studed using in a special detection cell
Gentles, Jeremy A., Christine L. Coniglio, Michael T. Mahnken, Joshua M. Morgan, Matthew M. Besemer, and Christopher J. MacDonald. "The Demands of a Single Elimination Collegiate Tennis Tournament." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/3971.
Full textLale, Ahmet. "Développement de transistors à effet de champ à base de nanofils de silicium pour la détection en phase liquide." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30175/document.
Full textIon-sensitive field effect transistors (ISFET) are electronic components designed to operate in liquid phase. To summarize, they are MOSFET-based devices whose metal gate is replaced by an ionosensitive insulating layer. In the early 2000s, these components evolved with the introduction of the first device based on silicon nanowires. Thanks to their small dimensions, these sensors opened up new perspectives, such as the study of intracellular metabolisms. The aim of this thesis was to develop and study a type of ISFET sensor, based on silicon nanowires, with Al2O3 alumina as sensitive layer. The first part of this work was focused on the integration of thin alumina Al2O3 films in a MOSFET process. This material had to be deposited on silicon nanowires, that is why Atomic Layer Deposition (ALD) was used. This method allows to deposit films with uniform thickness all around nanowires. After the study of ALD-Al2O3, the second major part of this project was to develop innovative structures, based on silicon nanowires, using microelectronics methods. Transistors consisting of a single nanowire, and others consisting of parallel networks of nanowires were fabricated. These sensors were integrated in microfluidic channels, allowing to precisely locate the liquid on nanowires and also to work in micro/nanovolumes. The last part of this project consisted in characterizing these sensors in liquid phase. The different configurations showed their advantages and disadvantages in terms of transconductance, leakage currents, slopes below the threshold, sensitivities to pH and interfering ions (Na+ and K+). The characterizations proved to be excellent and suggest interesting prospects for biological applications. The main innovations of these sensors are: the use of suspended nanowires, the realisation of a bilayer SiO2/Al2O3 ion-sensitive sheath all around the nanowires, the doping variation along the nanowires which led to the realization of N+/P/N+ junctions, and the integration of sensors into covered microfluidic channels
McCarthy, Jeffrey J. "Potentiometric microsensors and telemetry." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39268.
Full textThe second phase of research focussed on the development of a pH sensitive radiotelemetric device that could eventually be used for the noninvasive monitoring of gastric pH. The first attempt used an ISFET as a variable resistor in a simple telemetry circuit. The drift in the pH dependent signal from this device was significant. The use of a differential sensor was studied as a possible way to minimize the effect of signal drift. This system measured the differential output of a pH ISFET and a pH insensitive ISFET. The pH insensitivity was due to an alkanethiol monolayer at the ISFET$ vert$solution interface.
It was shown that ISFETs are well suited for use as sensors in telemetry devices. The union of these previously independent research areas has been achieved.
Zribi, Aymen. "Fluxmètre thermique : conception, modélisation, réalisation et caractérisation. Mesures de températures et de densités de flux thermiques." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2085/document.
Full textFor future applications in the field of low-temperature energy have sting in microsystems, knowledge of wall heat transfer is of great importance. These measurements are carried out using specific sensors which makes possible to know the total heat flux exchanged between walls and the surrounding environment. This study concerns the development of a gradient heat flux sensor compliant with their requirements associated with thermal machines such as micrometric Stirling engines. Six types of heat flux sensor with resistance temperature detector have been developed from different materials, with various geometries and shapes of sensing elements. An electro thermal study, taking into account the self-heating effect, was carried out and experimentally validated. The fabrication and characterization techniques, mainly carried out in clean rooms, allowed to produce numerous thin-film sensors. Specific housings for these sensors have been developed. These heat flux sensors, whose resistances have been calibrated with a highly accurate reference probe, also allow measuring the temperature. To measure the heat flux density, two methods were tested. The first method is indirect : it consists in measuring the temperature gradient using two platinum resistance probes. The second method is direct : it is based on heat flux calibration. The calibration and measurement benches have been modeled. Then, the experimental and numerical results have been compared. Finally, the influence of the sensor intrusion on the thermal fluxes distribution in the investigated sample, with or without a specific housing, has been studied
Kerness, Nicole. "CMOS-based calorimetric chemical microsensors /." [S.l.] : [s.n.], 2002. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14839.
Full textPathak, Shrey. "Piezoelectric microsensors for semiochemical communication." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/57210/.
Full textCordero, Álvarez Rafael. "Subcutaneous Monitoring of Cardiac Activity for Chronically Implanted Medical Devices." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS020.
Full textThe aim of this doctoral thesis was the development of sensors and algorithms for the improved monitoring of cardiac activity in the subcutaneous implantable cardioverter-defibrillator (SICD). More precisely, to improve the detection specificity of dangerous tachyarrhythmia such as ventricular tachycardia (VT) and ventricular fibrillation (VF). Two independent VT/VF detection schemes were developed for this: one electrophysiological in nature, and the other hemodynamic. The electrophysiological sensing scheme relied on a special ECG that was recorded along a short dipole located above the lower left pectoralis major. This short dipole maximised R/T ratio and signal-to-noise ratio in a total of 9 healthy volunteers. In theory, it will reduce the risk of false positive VT/VF detections simply by consequence of the dipole size, location, and orientation and independently of any further signal processing methods. The hemodynamic sensing scheme relied on cardiac vibrations recorded from two tri-axial accelerometer prototype sensors. These subcutaneous cardiac vibrations were characterised, physiologically validated, and optimised via their filtering along specific bandwidths and projection along a patient specific reference frame. The world’s first independent cardiac vibration VF detection algorithm was developed operating on these optimised signals. The same accelerometer prototypes were also shown to be able to record respiratory accelerations and detect apnoea. A final subcutaneous lead prototype was developed capable of recording the short dipole ECG, cardiac vibrations, and respiratory accelerations. It consisted of three electrodes, a bi-axial accelerometer, and industry-standard device connectors. The prototype lead was implanted in a fourth and final animal
Srinivas, T. A. S. "A free-standing microthermopile infrared detector." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259660.
Full textPeng, Tao. "Conception et réalisation de micro-capteurs à magnéto-impédance pour le contrôle non destructif." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112407/document.
Full textThe capability to detect micro-defects or buried flaws in the metallic parts is an important issue for the aerospace or nuclear industry. The technique of nondestructive testing (NDT) by eddy current is widely used for these applications. This thesis is part of collaboration project aimed at the realization and integration of magnetic field microsensors based on the magneto-impedance (MI) effect for the NDT detection systems. These multilayered structure microsensors (ferromagnetic/conductor/ferromagnetic) were realized in the clean room by thin film deposition method. A post-annealing step with magnetic field was then used to optimize the material properties and to induce magnetic anisotropy in the ferromagnetic layers. A method based on the double amplitude demodulation was proposed for the dynamic characterization of the sensors. The important parameters such as the geometry, the anisotropy and the driven frequency were studied in order to optimize the characteristics. The results showed that a bias field is necessary for the application. Therefore, we have investigated the possibility to realize, through thick micromoulding technique, a 3D microsolenoid and preliminary work on integrating a sensor in the microsolenoid by film transfer has been carried out. Finally, a theoretical study was investigated by taking into account the results obtained experimentally. For this purpose, the model of Landau-Lifshitz-Gilbert (LLG) has been implemented in an electromagnetic finite element calculation program in order to determine the impedance of the sensor as a function of the applied magnetic field