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 30 for “"Microsensors"”.
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Energy efficient RF communication systems for wireless microsensors
… fault tolerant monitoring of the environment. Microsensors are required to operate for years from a small energy source while maintaining a reliable communication link to the base station. In order to reduce the energy consumption of the sensor network, two aspects of the system design …
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Image Chipping with a Common Architecture for Microsensors (CAuS)
Recent interest has emerged in microsensor platforms that are capable of supporting reconnaissance, surveillance and target acquisition operations. These devices typically consist of one or more sensors, signal conditioning and processing subsystems, a radio link and a power source. Sensors …
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High temperature tolerant optical fiber inline microsensors by laser fabrication
… explored three types of fiber inline microsensors fabricated by two types of laser systems. Using a COâ‚‚ laser, long period fiber grating (LPFG) and core-cladding mode interferometer sensors were fabricated. Using a femto-second laser, an extrinsic Fabry-Perot interferometric (EFPI) …
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A Plastic-Based Thick-Film Li-Ion Microbattery for Autonomous Microsensors
… use in a hybrid micropower system for autonomous microsensors. A composite porous electrode structure and a liquid state electrolyte were implemented in the microbatteries to achieve the high power capability and energy density. The use of single-walled carbon nanotubes (SWNTs) was found to …
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Microsensors for the measurement of shear forces in turbulent boundary layers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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Design, analysis and testing of humidity microsensors produced in MITEL 1.5um CMOS technology
… in view of their potential application in microsensors. Polyaniline compound is proposed for fabrication of prototype micro humidity sensors. Analytical models of the resistive and capacitive microsensors are developed to study the steady-state and transient performance characteristics of …
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Interconnection, Interface And Instrumentation For Micromachined Chemical Sensors
… usability toward three-electrode electrochemical microsensors. Using separately fabricated microsensors, the final instrument with two different designs--flow-through and plug-in type was tested for chlorine detection in water samples. The chemical concentration of chlorine ions could be …
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Micron-scale thermistors for rapid transients in interfacial temperature
… resolution in our temperature sensors, we use microsensors (specifically, thin-film thermistors), which are built using standard integrated-circuit techniques. A complete data acquisition system was built around the sensors, including various signal-conditioning hardware and software. The …
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Embeddable Multi-Material Wireless Micro-Sensors Utilizing Additive Manufacturing and Enhanced Microstructure
… of embeddable, multi-material wireless microsensors offers transformative potential for structural health monitoring (SHM) in aerospace applications. This work integrates additive manufacturing (AM) techniques with advanced microstructural design to produce flexible, high-resolution …
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Nano- and micro- electrodes: applications in the biosensing field
… UMEs were employed in the preparation of glucose microsensors which were based on the glucose oxidase immobilization and in the anodic oxidation of the enzymatically produced hydrogen peroxide. Indeed, a comparative study of the results obtained with four enzyme immobilization procedures was …
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Local Environment in Pitting Corrosion of Aluminum
The pH and chloride microsensors were used to study propagation and repassivation of pits on pure aluminum in pH 11 NaCl solution. It was concluded that the pH inside a growing pit was around 2.7, and the chloride concentration was higher than the saturation concentration. After current to the pit …
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A Computational Approach For Investigating Unsteady Turbine Heat Transfer Due To Shock Wave Impact
… equipped with pressure transducers and heat flux microsensors. As the shock wave strikes the blade, time resolved pressure, temperature, and heat transfer data were recorded.
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Medida de óxido nítrico por amperometria induzida pela N-saliciloiltriptamina em células endoteliais recém dispersas
… 75%). Then, calibration was performed using a microsensors of CuCl 2 solution and a spontaneous NO donor, SNAP. Finally, increasing concentrations were added to STP (1; 10 and 100 μ M) for performing the measurement of NO by amperometry. The results of the flow cytometry was 90% of the cells …
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Photonic Crystal Lorentz Force Magnetometer for Out-of-Plane Magnetic Field Sensing
… miniaturization of highly sensitive and accurate microsensors is crucial for advancing modern sensing technologies with the goal of integrating increasingly complex circuits onto compact devices, such as smart phones and wearables. In this work, a Lorentz force magnetometer was designed based on …
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Sensor Package Analysis and Simulation for Direct Sensor-to-Satellite Links
… the design and the performance of low-power microsensors that communicate directly to a satellite or a constellation of satellites. Information is spread using pseudo noise (PN) or Barker codes. The sensors use a single circular microstrip patch element with a wide beamwidth or a miniature …
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Fiber inline pressure and acoustic sensor fabricated with femtosecond laser
… dissertation explored two types of fiber inline microsensors fabricated by femtosecond laser: an extrinsic Fabry-Perot interferometric (EFPI) sensor with silica diaphragm for pressure/acoustic sensing, and an intrinisic Fabry-Perot interferometer (IFPI) for temperature sensing. The scope of the …
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Effects of shock wave passing on turbine blade heat transfer in a transonic turbine cascade
… heat flux measurements were made with Heat Flux Microsensors on both the pressure and suction surfaces of a single blade passage. Unsteady static pressure measurements were made using Kulite pressure transducers on the blade surface and end walls of the cascade. The experiments were conducted in …
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Chemical Application of Silicon-Based Resonant Microsensor
… real-time measurements using e.g. chemical microsensors built with microfabrication technologies. Among these, mass-sensitive chemical sensors, based on cantilever beams or surface acoustic devices, have shown substantial promise in gas-phase applications. In a liquid environment, the …
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Simultaneous nanothermal analysis using heated microcantilevers
… With the recent advancements in the area of microsensors, nanothermal analysis has improved and gained research interest. This work presents recent thermal analysis applications performed with a heated microcantilever. Heated microcantilevers have low thermal mass, resulting in high heating …
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Effects of freestream turbulence on turbine blade heat transfer in transonic flow
… heat flux measurements were made with Heat Flux Microsensors at two positions on the suction side of turbine blades. The experiments were conducted on a stationary cascade of aluminum turbine blades for heated runs at transonic conditions. Non-dimensional flow parameters were matched to actual …
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