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.
Results
Showing 1 to 20 of 58 for “"electrical signal"”.
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RF phase modulation of optical signals and optical/electrical signal processing
Analog RF phase modulation of optical signals has been a topic of interest for many years, mainly focusing on Intensity Modulation Direct Detection (IMDD). The virtues of coherent detection combined with the advantages of Frequency Modulation, however, have not been explored thoroughly. By …
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Simultaneous visual and electro-cardiogram measurements of zebrafish embryos
… embryo was placed between two electrodes and the electrical signal was amplified 100 times, then a computer recorded the data. The visual reading of the zebrafish heart rate was obtained by viewing the embryo under a microscope. A variety of approaches were investigated to determine the heart rate …
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A PROOF OF CONCEPT FOR DETECTION OF PALATO-LINGUAL CONTACT WITHOUT INTRAORAL ELECTRODES IN A HUMAN PARTICIPANT
… thesis conceived and investigated an unexpected electrical signal that may not be noticed during regular electroglottography (EGG) when electrodes are conventionally placed on the anterior surface of the throat. It appears that there is a measurable electrical signal from the EGG equipment when …
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Organic lateral heterojunction devices for vapor-phase chemical detection
… sensor scheme, a large contribution to the noise signal is the inefficient transduction of the polymer's chemically sensitive, photoluminescent signal into an electrical signal. The poor optical coupling of the polymer's photoluminescence into a photodetector, reduces the signal-to-noise ratio …
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An Authentic Ecg Simulator
… an ECG simulator provides ECG monitors with an electrical signal that emulates the human heart's electrical signal so that the monitor can be tested for reliability and important diagnostic capabilities. However, the current portable commercially available ECG simulators are lacking in their …
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Data Logging System for a Synthetic Aperture Radar Unit
… converts the rotation of a wheel into an electrical signal while also providing stability for taking accurate radar measurements. The output data from the radar unit is stored as a properly-formatted sound file to allow for immediate data analysis.</em></p>
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Interpreting human activity from electrical consumption data through non-intrusive load monitoring
… tool. Signs of wear are detectable through their electrical signal. Third, it provides awareness of human activity within a network. Each device has an electrical fingerprint, and specific devices imply associated human actions. From voltage and current measurements at a single point on the …
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Integrated Piezoresistive Sensing for Feedback Control of Compliant MEMS
… to transduce the structures' deflection into an electrical signal. This dissertation addresses three topics associated with integrated piezoresistive sensing: developing an empirical model describing the piezoresistive response of polycrystalline-silicon flexures, designing compliant MEMS with …
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Buckling at the Fluid - Soft Solid Interface; A Means for Advanced Functionality within Soft Materials
… stimuli, first a mechanical strain and then an electrical signal. We investigate the behavior of each system under different conditions experimentally, numerically, or theoretically. We also show that the coupled interaction between fluid and the soft film plays a critical role in the shape of …
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Sensing Interfacial Non-Faradaic and Faradaic Processes via Plasmonic-Enhanced Metallic Luminescence in Nano-Optoelectrodes
… application of nanoplasmonic metal luminescence signals in optical voltage biosensing, hybrid optical-electrical signal transduction, and interfacial electrochemical monitoring.
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Anharmonic Acoustic Technique for Detection of Surface-bound Particles
… modulation of the resonator from the transduced electrical signal. Physisorbed and specific interactions both in air and liquid medium are studied using thickness shear mode quartz crystal resonators and streptavidin-coated polystyrene microbeads (SCPM) of various sizes. It is found that the …
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Testing and modeling of photo-electric modulators
Optical links are a promising alternative to the electrical interconnects that are currently used between chips within a computer. A crucial part of an optical link is a modulator, a device that converts an electrical signal into an optical signal. This thesis explores the physics of how these …
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Analysis of variation in on-chip waveguide distribution schemes and optical receiver circuits
… has emerged as a possible alternative to electrical interconnect at chip-to-chip and on-chip length scales because of its potential to overcome power, delay, and bandwidth limitations of traditional electrical interconnect. This thesis examines the issues of variation involved in the …
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Development of 3-phase inverter with PID voltage control
The inverter converts electrical signal from DC to AC by using power electronic circuits. Inverter output is square waves and a filter is needed to change the output to a sinusoidal wave. A control method is implemented in this project to create stable sinusoidal voltage amplitude. The benefit of …
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Vibration detection in turbomachinery using non-contacting sensors
… blade as it passes the sensor. They generate an electrical signal proportional to the distance of a blade from the sensor. Existing algorithms extract two pieces of information from the ECS signature, signal magnitude and signal zero crossing time. The signal magnitude is used to find tip …
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Signal processing for DNA sequencing
… as base calling: it is the conversion of the electrical signal-the electropherogram--collected by the sequencing equipment to a sequence of letters drawn from ( A,TC,G ) that corresponds to the sequence in the molecule sequenced. This work formulates the problem as a pattern recognition …
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Electrical conductivity of polyaphrons (biliquid foams)
… aqueous phase and a dispersed oil phase. Electrical conductivity measurements of many polyaphrons over a range of varying oil phase volume to aqueous phase volume ratio (PVR) indicate that the path of electricity through polyaphrons is independent of the nature of oil phase and aqueous …
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A photophonic instrument concept to measure atmospheric aerosol absorption
… by the aerosol in the chamber. The pressure signal was sensed by microphones, then the electrical signal amplified and processed by a differential amplifier. The testing showed the instrument had sufficient sensitivity and low enough system noise to measure an absorption coefficient of about …
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Multi-physics Modeling and Calibration for Self-sensing of Thermomechanical In-plane Microactuators
… the mechanical state of the TIM using the same electrical signal that actuates the TIM. In this way the TIM is able to operate as a self-sensing actuator. To allow this multi-physics model to be tractable, work was done to simplify the thermal modeling of the TIM. A preliminary calibration …
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