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 “"Sensor sensitivity"”.
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Enhancement of strain sensor sensitivity by combination of polarization maintaining fiber and single mode fiber in sagnac loop
… sensing. techniques provide a unique set. of sensors which are small, easy to fabricate, lightweight, immune to electromagnetic interference (EMI), high sensitivity, large scale multiplexing, and in most cases inexpensive to manufacture. These advantages are the motivation behind continued …
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Electrospun membranes for implantable glucose biosensors
… biomimetic coatings on implantable glucose biosensors and test their efficacy as mass-transport limiting and tissue engineering membranes, with special focus on achieving reliable and long sensing life-time for biosensors when implanted in the body. The 3D structure of electrospun membranes …
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Fluidic characterization of electric field sensitivity of Ti-GaAs Schottky junction gated field-effect biosensors
This thesis reports the electric field sensitivity of fluid gated metalsemiconductor hybrid (MSH) Schottky structures consisting of a Titanium layer on ntype GaAs. Compared to standard field-effect sensors, the MSH Schottky structures show 21 times larger resistance change with electric field at …
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Development of Novel Biosensor Platforms for Point-Of-Care (POC) Diagnostics
… were utilized to fabricate a conductometric biosensor for label-free, time-point, DNA loop-mediated isothermal amplification (LAMP) detection. The incorporation of Au nanoislands between the electrodes resulted in a notable increase in sensor sensitivity (51.3%, 200%, and 48.5% enhancement for …
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Finite element simulation and parameter optimization of a flexible tactile pressure sensor array
… to optimize design of a flexible tactile sensor. The sensor consists of layers of thin-film copper and PDMS, and the model can be used to determine the effects on sensor sensitivity and durability of variations in material properties and geometry. The model was used to study the effect of …
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The Effects of Sensor Performance as Modeled by Signal Detection Theory on the Performance of Reinforcement Learning in a Target Acquisition Task
… algorithms. In this research the effects of sensor performance, as modeled through Signal Detection Theory (SDT), on the ability of RL algorithms to accomplish a target localization task are examined. Three levels of sensor sensitivity are simulated and compared to the results of the same …
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The Effects of Rewards on the Ability of an Autonomous UAV Controlled by a Reinforcement Learning Agent to Accomplish a Target Localization Task
… to locate targets faster with an increase in the sensor sensitivity values after the system achieves steady-state performance. The results were analyzed statistically to detect the effects and confirm the hypothesis.</p>
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Adaptive Control Strategies for Mitigating Spaceflight Fluid Shifts Using Lower Body Negative Pressure and Non-Invasive Fluid Shift Sensing
… using prototype non-invasive radiofrequency (RF) sensors for regional fluid shift detection. Additionally, the integration of the feedback from these sensors into Lower Body Negative Pressure (LBNP) chambers could allow for the development of an adaptive Lower Body Negative Pressure regulation …
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Dissolved Gas Analysis of Insulating Transformer Oil Using Optical Fiber
… discovering new ways integrate optical fiber sensors into high voltage transformers. This thesis is a continuation of that research by attempting to improve sensor sensitivity for hydrogen and acetylene gasses. Of note is the fabrication of new hydrogen sensing fiber for operation around a …
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Performance comparison of reflector and AESA-based digital beamforming for small satellite spaceborne SAR
Spaceborne Synthetic Aperture Radar (SAR) sensors play an ever increasingly important role in Earth observation in the fields of science, geomatics, defence, commercial products and services. The user community requirements for large, high temporal and spatial resolution swaths has driven the need …
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Light Emitting Diodes and a Monochrome Camera to Measure Chemical Optode Response
… manner. In this work a pH-sensitive optode sensor is used as a basis for comparing two different methods of measuring a sensor’s color.</p><p> A system using three different colored LEDs as illuminators and a monochrome camera as a detector has been designed to measure optode sensor …
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Faulty sensor detection mechanism using multi-variate sensors in IoT
… home and etc. IoT devices are equipped with sensors such as temperature, humidity, pulse sensor, smoke and etc., offer many types of services for these applications. IoT devices are lightweight and have limited computational capabilities often exposed to harsh environments, which can cause …
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Novel approaches to engineer glucose biosensors
Designing a biosensor capable of continuously monitoring blood glucose concentration in people with diabetes has been a major challenge for over three decades. In this work we attempt to develop a novel microspike based minimally invasive biosensor for this purpose. Also, as a part of an ongoing …
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Distributed-effect modal domain optical fiber sensors for flexible structure control
Recently, a new class of sensors has emerged which have scalar outputs derived from distributed measurements over a significant gauge length; these sensors are known as distributed-effect sensors. The most familiar example of a distributed-effect sensor is the piezoelectric laminate PVDF film; …
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Optical Fiber Fabry-Perot Interferometer based Sensor Instrumentation System for Low Magnetic Field Measurement
… proposes a miniaturized optical fiber based sensor system for the measurement of 3-dimensional vector magnetic fields. The operation of the sensor system is based on the detection of magnetostrictive dimensional changes in the sensor gage using a modified extrinsic Fabry-Perot Interferometer …
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Characterisation and optimisation of novel Sol-Gel materials for luminescence-based 02 sensing
Current sensor trends, such as multi-analyte measurement, miniaturisation and printability, are important drivers for materials to be used in optical chemical sensors. In recent years, there has been a focus on sol-gel materials for sensor applications due to their excellent optical properties, …
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MEMS Biosensor for Water-Immersed Application
… environment. In order to obtain a cell-based biosensor, the sensing method needs to be reliable and repeatable in a liquid environment. Therefore, this study is focused on transforming existing air-based sensors to water-immersed applications. This study includes two types of sensors.</p> …
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Electrooptic electric field sensor for dc and extra-low-frequency measurement
… out towards the development of an electrooptic sensor for DC and extra low frequency electric field measurement. Available cubic electrooptic crystals were compared from the sensor sensitivity point of view. A new figure of merit was used taking into account the attenuation of the electric field …
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Distributed, adaptive deployment for nonholonomic mobile sensor networks : theory and experiments
… coverage control for a team of mobile sensors. This new approach assumes nonholonomic sensors rather than the usual holonomic sensors found in the literature. The kinematics of the unicycle model and a nonlinear control law in polar coordinates are used in order to prove the stability …
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Synthesis Imaging with Vector Sensor Arrays
… of electrically-small antennas to reach the sensitivity required for detecting faint astronomical signals, and it would need to be positioned far from the Earth to reduce the impact of Earth-generated radio interference. The high number of antennas and large distance from the Earth would make …
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