Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 83 for “"Piezoresistive"”.
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Biofidelic Piezoresistive Sandwich Composites
… materials to be electrically conductive and piezoresistive to facilitate direct instrumentation. Carbon nanotubes (CNTs) are a possible filler to impart electrical conductivity and piezoresistivity to silicone biofidelic materials. A sandwich structure of silicone and CNT sheet, comprising …
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The Piezoresistive Effect In Microflexures
… is to present a new model for predicting the piezoresistive effect in microflexures experiencing bending stresses. A linear model describing piezoresistivity exists for members in pure tension and compression. Extensions of this model to more complex loading conditions do not match …
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Silicon Piezoresistive Microcantilever For Potentiometric Sensing
… improve their sensitivity. Using fabricated Si piezoresistive microcantilever and Pt coated substrate, an miniaturized potentiometric sensor is demonstrated with detection capability of 200 ppm H2.</p>
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Piezoresistive Sensing of Bistable Micro Mechansim State
… sensing of bistable mechanism state using the piezoresistive properties of polysilicon, thus eliminating the need for electrical contacts. Changes in position are detected by observing changes in resistance across the mechanism. Sensing the state of bistable mechanisms is critical in their …
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MEMS Piezoresistive Micro-Cantilever Arrays for Sensing Applications
… requiring more complex setups. In particular, piezoresistive readout has been considered as the best trade-off between sensitivity and system complexity, due to the easy implementation of readout systems for resistive sensors and to their high potential for integration with standard CMOS …
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Design of Piezoresistive MEMS Force and Displacement Sensors
… of micro sensors lies in exploiting the piezoresistive properties of silicon, the material of choice in many MEMS fabrication processes. Piezoresistivity—the change of electrical resistance due to an applied strain—is a valuable material property of silicon due to its potential for high …
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Detecting Delamination in Carbon Fiber Composites Using Piezoresistive Nanocomposites
… detecting delamination in composite plates using piezoresistive nanocomposites. This new procedure is setup and studied through both experimental and computational investigations. In this research, nanocomposites with 5% coarse graphene platelets are fabricated for detecting delamination. 8-ply …
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Development and Characterization of Piezoresistive Nanocomposites for Sensing Applications
<p>Carbonnanotube basedhybrid nanocomposites are known to exhibit remarkable electrical and mechanical properties with many potentials in strain and damage sensing applications. In this work, we fabricate hybrid nanocomposites with carbon nanotube (CNT) sheet and graphene nanoplatelets (GNP) as …
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Piezoresistive UHMWPE WMCNT Sensors for Instrumented Total Knee Replacements
… total knee replacement using a novel piezoresistive polymeric sensor. The addition of multi-walled carbon nanotubes (MWCNT) as electrically conducting fillers to the ultra-high molecular weight polyethylene (UHMWPE) transforms the electrically insulating UHMWPE to a nano-composite …
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Integrated Piezoresistive Sensing for Feedback Control of Compliant MEMS
… to MEMS designers. A method of using integrated piezoresistive sensing is proposed and demonstrated as another option. Integrated piezoresistive sensing utilizes the inherent piezoresistive property of polycrystalline silicon from which many MEMS devices are fabricated. As compliant MEMS …
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Piezoresistive Hybrid Nanocomposites for Strain and Damage Sensing: Experimental and Numerical Analysis
… fillers for polymer nanocomposites.</p> <p>The piezoresistive behavior of these nanocomposites makes them ideal for sensing applications. Besides, hybrid nanocomposites with multiple fillers like carbon nanotubes (CNTs) and graphite nanoplatelets (GNPs) are known to exhibit improved electrical …
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High Frequency Thermally Actuated Single Crystalline Silicon Micromechanical Resonators with Piezoresistive Readout
… research, thermally actuated resonators with piezoresistive readout have been developed. It has been shown that not only do such resonators require a simple fabrication process, but also their performance improves at higher frequencies by scaling down all the dimensions of the structure. In …
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A Microelectromechanical-Cantilever Hydrogen Sensor with Palladium-Driven Bending and Piezoresistive Readout
Hydrogen gas (H₂) is considered a promising source of environmentally friendly and sustainable energy of benefit for global decarbonization. However, given the flammable and explosive nature of H₂, highly sensitive and selective detection systems with fast response are needed to enable leakage …
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Flexible and stretchable tactile sensing skins using microwave transmission lines and piezoresistive rubber
… PDMS, conducting metal doped PDMS, and piezoresistive carbon black doped PDMS. Flexible and stretchable sensors capable of sensing pressure, shear, and finger angle were demonstrated. The finger angle sensor showed a sensitivity of greater than 2.3 k[omega] per degree with a 230 k[omega] …
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Overcoming Thermal Challenges to Acquire Absolute Pressure Measurements in Rotating Detonation Engines Using Piezoresistive Pressure Transducers
… absolute pressure measurement using a single piezoresistive (PR) transducer. First, a proprietary PR transducer with a pressure rating of 20 MPa is implemented. The Wheatstone bridge with a 5th-wire circuit and related analysis procedures are introduced to measure the probe temperature …
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Tactile sensor design optimization for footwear applications from piezoresistive elastomer to Hall-effect integrated sensing methods
… sensing methodologies will be analyzed: piezoresistive elastomer and Hall-effect integration. The piezoresistive elastomer method will involve testing mixtures of urethane or silicone rubbers with various conductive substances such as carbon black. Compressing the sensors at various …
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Development of a porous piezoresistive material and its applications to underwater pressure sensors and tactile sensors
MEMS (Microelectromechanical System) pressure sensor arrays are gaining attention in the field of underwater navigation because they are seen as alternatives to current sonar and vision-based systems that fail to navigate unmanned undersea vehicles (UUVs) in dark, unsteady and cluttered …
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A New Multifunctional MEMS-Based Piezoresistive Pressure Sensor for Monitoring Static, Acoustic, and Turbulent Events in Underwater Applications
… the performance of Nanosonic Inc.'s MEMs-based piezoresistive pressure sensors; specifically, their multifunctional capabilities in monitoring static, acoustic, and turbulent events. Nanosonic sensors were evaluated though extensive water tunnel testing. Two sensors were surface mounted into a …
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Multiscale Modeling of CNT-Polymer Nanocomposites and Fuzzy Fiber Reinforced Polymer Composites for Strain and Damage Sensing
… nanocomposite material has observable piezoresistive effect, that is to say that changes in applied strain may induce measurable changes in resistance. The first focus of the work is on modeling the piezoresistive response of the CNT-polymer nanocomposites by using computational …
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Computational Micromechanics Analysis of Deformation and Damage Sensing in Carbon Nanotube Based Nanocomposites
… hopping mechanism to effective macroscale piezoresistive response through finite elements based computational micromechanics techniques. The evolution of nanoscale conductive electron hopping pathways which leads to nanocomposite piezoresistivity is studied in detail along with its …
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