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 45 for “"microsensor"”.
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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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Rotor speed microsensor for the MIT Microengine
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 …
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Electrochemical multiphase microsensor for detection of acetylcholinesterase inhibitors
… are amongst the main parameters affecting the microsensor performance. Experimental and simulation results demonstrate that the silicon based micro-detector proposed in this work can be a promising way to selectively detect ultra low levels of hazardous materials.
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Base station design for a wireless microsensor system
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Protocol stacks for power-aware wireless microsensor networks
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 …
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An energy-efficient radio for wireless microsensor networks
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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A high resolution capacitance-based lateral position microsensor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Microsensor development for the study of droplet spreading
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Feedforward temperature control using a heat flux microsensor
The concept of using heat flux measurements to provide the input for a feedforward temperature control loop is investigated. The feedforward loop is added to proportional and integral feedback control to increase the speed of the response to a disturbance. Comparison is made between the feedback …
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Development and calibration of a heat flux microsensor
… measure very high heat flux rates. The heat flux microsensor incorporates a differential thermopile, a set of 100 differential thermocouple pairs connected in series across a thin thermal resistance layer. The gage is fabricated on a model surface without the need for additional adhesives. The …
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An energy efficient RF transceiver for wireless microsensor networks
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 …
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Hardware and software for a power-aware wireless microsensor node
… 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 …
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Lower power RF transceiver modeling and design for wireless microsensor networks
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, …
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Evaluation of a Heat Flux Microsensor in a Transonic Turbine Cascade
The effects of using an insert Heat Flux Microsensor (HFM) versus an HFM deposited directly on a turbine blade to measure heat flux in a transonic cascade are investigated. The HFM is a thin-film sensor, 6.35 mm (0.250") in diameter (for an insert gage, including the housing) which measures heat …
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Laterally Movable Gate Field Effect Transistor (LMGFET) for microsensor and microactuator applications
Laterally Movable Gate Field Effect Transistor (LMGFET) invented at LSU as a microactuator is the subject of study in this research. The gate moving in lateral direction in a LMGFET changes channel width but keeps the channel length and the gap between the metal gate and the gate oxide constant. …
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Measurements of thermal properties and blood perfusion using the heat flux microsensor
A thin-film heat flux sensor was used in two transient conduction applications. First it was used in a device for simultaneously determining the thermal conductivity, κ, and the thermal diffusivity, α, of solid materials. The device was heated and then touched to metal samples at room temperature. …
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Development and Characterisation of a Carbon Based pH Microsensor and Studies on Polypyrrole Nanowires
In this thesis the electrochemical deposition of polypyrrole (PPy) into nanowire and bulk morphologies is reported. The electrochemical properties of the different conformations of PPy were examined in order to ascertain their conductivities and surface areas. This could determine the optimisation …
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Improving the stability of an oxime based electrochemical microsensor for organo-phosphate vapor detection
… and compatibility with the current microsensor material (PMMA). Further studies showed that ethanol had a small effect on micro-sensor performance by reducing the rate of cyanide production and decreasing the overall response time. To avoid incomplete mixing of the aqueous and …
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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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