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Malloch, Joseph W. "A consort of gestural musical controllers : design, construction, and performance." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112506.
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This thesis project presents the T-Sticks, a new family of digital musical instruments (DMIs). Most DMIs are either entirely unique interfaces, or exist as design iterations in which each incarnation is intended to improve on the last. The T-Sticks are instead intended to form a complementary group or consort which may be performed ensemble and also performed individually in solo pieces or works for mixed instrumentation. Each of the T-Sticks is based on the same general structure and sensing platform, but each also differs from its siblings in size, weight, timbre and register.This document explores some of the issues challenging and motivating the field of DMI design and performance, and describes the motivations behind the T-Stick project in this context. Several existing DMIs are examined for similarities to the T-Stick and compared in terms of design intention, implementation, and usage. The hardware and software designed and built for this project is presented, along with insights gained through collaboration with performers and composers in the context of McGill University's Digital Orchestra project. The performers in question have collectively practiced and performed with the T-Stick for hundreds of hours in the lab, practice room, and on the concert stage. The consort of T-Sticks will be featured as an ensemble in a piece to be performed during the 2008 MusiMarch festival in Montreal.
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Cho, Myung Kyu. "Structural deflections and optical performances of lightweight mirrors." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184875.
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A parametric design study of light weight mirror shapes with various support conditions was performed utilizing the finite element program NASTRAN. Improvements in the mirror performance were made based on the following design criteria: (1) minimization of the optical surface wavefront variations, (2) minimization of the self-weight directly related to cost of manufacturing, and (3) optimal location of support points. A pre-processor to automatically generate a finite element model for each mirror geometry was developed in order to obtain the structural deformations systematically. Additionally, a post-processor, which prepares an input data file for FRINGE (an optical computer code) was developed for generating the optical deflections that lead to the surface wavefront variations. Procedures and modeling techniques to achieve the optimum (the lightest and stiffest mirror shape due to self-weight) were addressed. Fundamental natural frequency analyses, for contoured back mirror shapes for a variety of support conditions, were performed and followed by comparisons of the results which were obtained from NASTRAN and a closed-form approximate solution. In addition, element validity and sensitivity studies were conducted to demonstrate the behavior of the element types provided in the NASTRAN program when used for optical applications. Scaling Laws for the evaluations of the optical performances and the fundamental frequencies were established.
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Even-Sturlesi, Doron. "A systematic approach to global optical design." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/29834.
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Sutcliffe, Laura Francesca Rose. "Environmentally conscious design of medical devices." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610758.
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Bushroe, Frederick Nicholas 1964. "An optical head for a magneto-optic disk test system." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277154.
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Design and operation of modular optical head for a magneto-optic test system are described. Alternate solutions to design problems are discussed. A 30mW semiconductor laser with an integrated 250MHz oscillator is selected. The oscillator is used to modulate laser read current for a reduction in laser feedback noise. A collimating lens with an appropriate focal length is chosen so the beam's truncation at the objective yields the maximum write power density. Astigmatism associated with the laser diode is reduced to 0.125 waves by defocusing the collimating lens and circularizing with an anamorphic prism pair. Head components are aligned within several minutes of arc by using alignment apertures and an autocollimator. Aberrations due to tilt between the disk and beam are examined and coma is found to be the major contributor.
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Mendoza, Hiroshi Antonio. "Design and construction of instruments for exciton diffusion characterization and for patterning of thin films." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/77027.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2012."February 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 43-44).
In this thesis the instruments explore two main aspects of organic optoelectronic devices. One instrument characterizes exciton diffusion and the other patterns organic thin films. Exciton diffusion characteristics are important to study in organic materials because excitons mediate the transport of energy. In this work, a fluorescence microscope is designed and built in order to image directly the triplet exciton diffusion in organic crystals. Patterning of organic thin films in industry is done by fine-metal masks, which are fragile and do not scale with substrate size. The second instrument is the first fully functional prototype for a new type of dry lithography technique invented in our research group which addresses the scalability and compatibility problems of past patterning methods. The proof-of-concept instrument replaces the traditional fine metal mask patterning method by patterning a sublimable mask with a micro-stamp.
by Hiroshi Antonio Mendoza.
M.Eng.
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Simon, Nandor Juan. "Development of an electronic message display." Thesis, Cape Technikon, 1993. http://hdl.handle.net/20.500.11838/1143.
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Thesis (Masters Diploma (Electrical Engineering)--Cape Technikon, Cape Town, 1993In the last decade the advertising industry has developed into an advanced science which increasingly relies on the use of electronic utilities and modern technology. The advent of the microcontroller has made it possible to incorporate electronic intelligence into advertising utilities. This thesis describes the design, development and functioning of a stand alone programmable electronic message display as required by the Electrical Engineering Department of the Cape Technikon.
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Chiu, Chi-tat, and 趙志達. "Design and development of a programmable micro-ultrasound research platform with parallel computing capacity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46290977.
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Pollard, Lloyd Wayne 1936. "Design of a flexure mount for optics in dynamic and cryogenic environments." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276741.
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The design of the flexure mount recently submitted to NASA Ames for the structural support of the primary mirror of the Space Infrared Telescope Facility (SIRTF) is presented. The flexure system must passively accommodate the differential thermal contraction between the glass mirror and the aluminum structure of the telescope during cryogenic cooldown. Further, it must support the one meter diameter, 116 kilogram (258 pound) primary mirror during a severe launch to orbit. Procedures used to establish the required radial compliance using computer programs NASTRAN and FRINGE are discussed. The parametric design program developed to study early concepts is presented. Methods of combining modal responses resulting from a displacement response spectrum analysis are discussed, and a combination scheme called MRSS, Modified Root of Sum of Squares, is presented. Modal combination schemes using MRSS, SRSS, and ABS are compared to the results of a Modal Frequency Response analysis.
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Westlund, Johan. "Design and construction of a contactless excitation and response measurement system." Thesis, KTH, Industriell produktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246324.
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Manufacturing industry works on Overall Equipment Effectiveness (OEE) to increase the yield and speed of machining. A good knowledge of the machine properties is important to increase the speed while still maintaining stable cutting with low tool usage.To make models of the machine is therefore important and in machining a common way to extract the dynamic properties is frequency response measurement. One way is to use an impact hammer to excite the machine tool and measure the response. The problem is that a hammer can only be used on a non running machine. At Manufacturing and Metrology Systems division at KTH (MMS) a test method for contactless excitation has been developed that uses electromagnets to excite the machine tool. By using contactless testing it can be used on rotating machine tools without real cutting in materials. In this thesis a new test system for the contact less testing method has been designed and constructed to test if it is possible to do test on a bigger variety of rotating cutting machine tools. The results for the prototype is presented and evaluated.Dagens tillverkningsindustri arbetar för att utrsutningens totala effiktivitet ska höjas genomatt öka hastigheten och minska material- och verktygsanvändningen vid bearbetningen utan att minska kvalitén på slutprodukten. För att öka hastigheten krävs en god kännedom om maskinens egenskaper för att maskinen ska arbeta under stabila förhållanden där också verktygets slitage minskas. Att ta fram modeller över maskinen är därför viktigt och inom skärande bearbetning är frekvensresponsmätning ett sätt att få ut de dynamiska egenskaperna av det skärandeverktyget. En vanlig testmetod är att med en hammare exitera verktyget och mäta responsen. Problemet är dock att hammaren bara kan mäta vid stillastående maskin. Vid MMS har en testmetod för kontaktlös exitering tagits fram där elektromagneter användsför exiteringen. På så sätt kan testet utföras på roterande verktyg utan att man behöver förbruka material. I detta arbete har ett nytt testsystem för denna testmetod designats och konstruerats för att testa om det är möjligt med testning på flera storlekar på maskiner för skärandebearbetning. Resultaten för prototypen presenteras och utvärderas.
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Sims, Gary Robert. "Characterization of a charge injection device detector for atomic emission spectroscopy." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184735.
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A Charge Injection Device (CID) detector has been evaluated as a detector for simultaneous multielement atomic emission spectroscopy. The CID was incorporated into a special liquid nitrogen cooled, computer controlled camera system. Electro-optical characterization of the CID and camera system included determination of readout noise, quantum efficiency, spatial crosstalk, temporal hysteresis, spatial response uniformity, and linear dynamic range. The CID was used as a spectroscopic detector for an echelle grating spectrometer equipped with a direct current plasma emission source. The spectrometer was a standard commercial instrument modified to provide a reduced image format more suitable for use with the CID detector. The optical characteristics of this spectrometer, including wavelength coverage, and optical aberrations are described. The spectroscopic system was evaluated with respect to detection limits, linear dynamic range, and accuracy in both single element and simultaneous multielement modes. Detection limits compared well to literature values reported for photomultiplier tube detector based systems under similar conditions. CID detection limits were superior in the near infrared and visible wavelength region, comparable in the middle UV, and higher in the far UV. The detection limits were determined to be limited by background radiation shot noise. Several elements of a certified standard reference material were simultaneously determined in order to assess the accuracy of the spectroscopic system. The results were highly accurate, even when operating near or below the 3σ limits of detection. Spectral interferences for elements were avoided by using several analytical lines for each element. The results of these investigations indicate that the CID is a superior multichannel detector for analytical atomic emission spectrometry. The capability to simultaneously monitor a wide, continuous spectral range with high spatial resolution, high dynamic range, low readout noise, and insignificant signal crosstalk is now possible. Many analytical benefits of this approach, such as the potential capability to perform rapid qualitative and semiquantitative analysis and the ability to select the optimum spectral lines for highly accurate quantitative analysis are now readily achievable.
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Sasian, Alvarado Jose Manuel. "Imagery of the bilateral symmetrical optical system." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184628.
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A brief study of the imagery of the bilateral symmetric optical system is presented. This study has been developed with a theoretical structure similar to that of the rotationally symmetric optical system and can be considered a generalization. It provides a simple, clear understanding of the main features of the imagery of the optical systems under consideration. and gives useful design insight. Some design examples are provided that illustrate the use and value of the theory developed.
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Mess, Francis McCarthy. "A Novel Sensor to Monitor Surface Charge Interactions: The Optically Stimulated Contact Potential Difference Probe." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10460.
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This study addresses the development of a sensor to monitor chemical adsorption and charge transfer processes on a surface using a contact potential difference probe (CPD). The current investigation is an outgrowth of ongoing research on non-vibrating CPD probes (nvCPD) which led to the recent development of a novel measurement technique utilizing optical stimulation: optically stimulated CPD (osCPD). Primary outcomes of this thesis are the theoretical modeling, fabrication and demonstration of a functional osCPD sensor. The research also involved significant engineering and experimentation in the design, development, and application of this sensor to oil condition monitoring.
This technique measures dielectric and chemical properties of a fluid at the interface between the fluid and a semiconductor substrate. Chopped visible light is used to stimulate the rear surface of a semiconductor substrate, and a CPD probe measures the work function response of the semiconductor on the front surface of the substrate. The work function response is influenced by the nature and quantity of adsorbed species on the top surface, allowing the probe to detect changes in chemical composition at the substrate/fluid interface.
An analytical model is developed that relates the osCPD sensor output signal to the chemical and dielectric properties of the oil sample, as well as to the geometry, composition, and control inputs of the silicon substrate and test fixture. In this investigation, the osCPD sensor was used to evaluate dielectric and chemical properties of commercially available engine oil. Oil samples were intentionally degraded through thermal aging (oxidation) and through addition of known contaminants. The osCPD sensor shows good sensitivity to depletion of antioxidants in the oil, as well as to the presence of ferric chloride, an oil-soluble salt typically used to calibrate laboratory test equipment.
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Higgins, Robert Francis 1962. "Hercules attitude processor (HAP)." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/38349.
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The design and analysis of a microprocessor-based gyro attitude data processing system used to geolocate natural phenomena from space was performed. Operational software was written and a HERCULES Attitude Processor (HAP) unit was built and tested.
Strict adherence to worst-case timing design criterion was a prime hardware design consideration. Weight, volume, and power requirements were also addressed. Redundancy was included for critical time maintenance functions. Hardware performance and accuracy was calculated and measured.
Operational software was written to control the functions of the HAP unit. Algorithms were written to accurately process the high speed gyro attitude data. Data communication between subsystems in the HERCULES system was controlled by the software. Subsystem configuration, operating modes, self-testing, and resource management was performed by the operational software.
Testing was performed on the HAP unit and operational software. Hardware and software performance was analyzed and is presented.Ph. D.
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Van, der Westhuyzen Petrus Johannes. "Probe characterisation, design and evaluation for the real-time quality Indication of milk." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1804.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.In order to rapidly detect, monitor and predict changes in milk as it ferments, sensors would need to be designed specifically for milk. To this end, invasive surgical stainless steel probes were investigated and the probe impedances were characterised according to measurements made in various saline concentrations. Based on these findings, specific probes were designed that were robust and easy to use in milk. To measure multiple probe sensors continuously and accurately, an automatic measurement device was designed and manufactured. The device was self-sustaining, portable and calculated and stored all probe impedance data internally, allowing experimental runs to take place in controlled laboratory environments. The probes designed in this thesis were consequently tested in various milk fermentation experiments and it was found that surgical stainless steel probes were effective at detecting and monitoring fermentation changes. The probe impedance changes also lead the pH changes in milk, giving it a predictive element. The probe sensor studies provided enough data so that studies could be done into potential non-invasive sensors. Therefore, capacitive sensors were investigated and a fringe field capacitor was presented as a potential non-invasive milk fermentation sensor.
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Brinkman, Karen L. "Design of a microcomputer-based open heart surgery patient monitor." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76031.
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A patient monitor device for use during open heart surgery has been designed and constructed. The device uses a VIC 20 microcomputer along with some additional circuitry to monitor 3 separate functions. The first patient variable monitored is the blood flow rate through the extracorporeal blood circuit during surgery. The device also continuously monitors and displays 6 separate temperatures. Finally, 3 individual timers are monitored and displayed with the device. Both the hardware and the software used in the design are fully described.Master of Science
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Levermore, Thorpe Dianne Marie. "Design, construction and operation of an automated vapor pressure determination apparatus (I). II, Gas chromatography/mass spectrometry headspace analysis of engine oil, III, Design of a chemically selective layer for ozone detection." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30491.
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Montarou, Carole C. "Low-level birefringence methods applied to the characterization of optical fibers and interconnects." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6993.
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Birefringence measurements are of great importance in a plethora of applications spanning from biology to optical communications. Birefringence measurements of nerve-fiber layers have emerged as an important diagnostic technique for early detection of glaucoma. Stress-induced birefringence in optical devices affects their performances by causing Polarization-Mode Dispersion (PMD) and Polarization-Dependent Loss (PDL). Stress-relaxation constitutes a key phenomenon governing the fabrication of some optical devices such as Long-Period Fiber Gratings (LPFGs). This drives the need to develop accurate optical instrumentation techniques to evaluate form and stress-induced birefringence.
This thesis deals with the development of new high-accuracy techniques for the characterization of stress-induced birefringence in optical devices. The new Two-Waveplate Compensator (TWC) technique is presented for single-point retardation measurements. It is extensively compared theoretically and experimentally to existing techniques including the Snarmont and Brace-Khler techniques. The Phase-Stepping Two-Waveplate Retarder (PSTWR) is also presented for high-accuracy measurements of retardation magnitude and orientation. The Colorimetry-Based Retardation Method (CBRM) is presented to measure retardation using white-light interference colors. The technique is implemented using a polarization microscope and a spectrophotometer.
The TWC and the Brace-Khler methods are implemented for full-field retardation measurements using a polarization microscope. Their accuracies are quantified over the entire field-of-view for small retardations. They are applied to the stress-induced birefringence imaging of LPFGs and polymer pillar waveguides. The TWC technique achieves an accuracy of 0.06 nm and a sensitivity of 0.07 nm. The Brace- Khler technique achieves an accuracy of 0.04 nm and a sensitivity of 0.09 nm. The spatial resolution of both techniques is 0.45 and #61549;m.
A Fourier-based algorithm is presented to compute the inverse Abel transform relating the retardation to the axial residual stress profile in optical fibers. It is used to calculate the residual stress profiles of single-mode fibers from full-field retardation measurements with the TWC and Brace- Khler techniques. The stress profiles computed in this work are in very good agreement with previously reported results in the literature. The TWC technique produces the most accurate stress measurements. The TWC technique is used to investigate the stress-relaxation phenomena in LPFGs fabricated using CO2 laser irradiations.
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Shin, Heungjoo. "Fabrication of Atomic Force Microscope Probes Integrated with Microelectrodes for Micro Four-Point Porbe and SECM-AFM." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10428.
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This research is dedicated to develop novel batch fabrication procedures for two distinct AFM (Atomic Force Microscope) probes integrated with electrodes enabling electrical sample characterization and electrochemical sample surface profiling respectively. These AFM probes allow for highly accurate control of the probe positioning, low contact force and sample surface imaging with high lateral resolution.
As an electrical characterization tool, a nickel micro four-point probe integrated with solid nickel tips was developed. Low electrical resistance of the probe and contact resistance were achieved due to the solid nickel cantilever and tips. Low aspect ratio solid metal tips reduced contact resistance resulting in stable electrical measurement. Conductivity loss easily experienced while using metal coated AFM cantilevers was overcome by solid nickel tip integration to the electrically conductive AFM cantilevers. The fabrication method introduces selective conical nickel tip etching in silicon dioxide etching chambers.
A novel batch fabrication method for SECM-AFM (Scanning Electrochemical Microscope-Atomic Force Microscope) tip integrated with a ring electrode was developed as a tool for electrochemical imaging as well as topological imaging. The electroactive area at an exactly defined distance above the apex of the AFM tip is fabricated using an inverse silicon mold technique. The electrode at a deliberately chosen distance from the end of a scanning probe tip allowing electrochemical sample imaging separated from sample topology imaging. The ring electrode coated with polymer entrapping enzymes enabled the probe to detect ATP from living epithelial cells.
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Zia, Beenish. "Electronic Pillbox Logger for people with Parkinson's Disease." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/189.
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Parkinson' Disease (PD) is a motor disorder characterized by rigidity, tremor, and hypokinesia with secondary manifestations like defective posture and gait, mask like face and dementia. Over the years it may lead to inability to move, breath and ultimately patient may succumb to chest infection and embolism. Prevalence studies show that more than six million people around the world suffer from PD. At present, there is no cure for PD but there are effective treatments that can slow the progression of the disease and regulate its affects. PD results from a deficiency of dopamine so most drugs that produce a salutary effect in PD either potentiate dopamine or work as dopamine agonists. Hence, to keep the symptoms of PD to a minimum it is very important that the medications be consumed regularly, so that the dopamine level is maintained in the body of the subject. Electronic pillbox logger is a device that has been designed to ensure this very much required medication adherence in PD subjects, which can also be used to measure the response to oral medication. This work describes the design and implementation of an electronic pillbox logger for use by people suffering from Parkinson's disease (PD). The pillbox logger is designed to track medication adherence and prompt the user to take medication on time. It is pocket-sized, portable, and compartmented. It has a variety of alarm systems to remind the user to take the correct dose of their medication at the correct time. Most importantly, it keeps an electronic log of the time of dosage consumption by detecting the presence/absence of pills in the pillbox. This overcomes major limitations of other pillboxes with a logging function that are often too large to carry, contain a single compartment, or only record the time the container was opened rather than the presence or absence of pills. The proposed pillbox logger complements a wearable device under development for people with Parkinson's disease that continuously monitors impaired movement. The combination of the pillbox logger with the wearable sensor will permit clinicians to determine the response to oral therapies, which can be used to optimize therapy. People with PD consume similar pills throughout the day hence the pillbox logger has been designed to detect the presence/absence of pills in general in the pillbox rather than which specific pills are absent or present in the pillbox logger. This feature of the current design that the device records knowledge about pills in general in the pillbox logger and not about any specific pills is a major reason why the current design is specific to PD subjects only. However, though the current design of the pillbox logger is designed for people with Parkinson's Disease, the pillbox is suitable for other maladies in which the timing of the medication is critical. The described pillbox logger was built and the design was validated after running a number of tests. The battery powered pillbox logger is able to accurately store the information about the actual presence/absence of pills in each compartment of the pillbox. It is capable of sending out reminder alarms at the right time of the day and can be connected to a host computer using a USB cable to read the stored information from it. The proper functional working of the pillbox logger after thorough testing proves that the design of pillbox logger was successful.
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Benafan, Othmane. "Design, Fabrication and Testing of a Low Temperature Heat Pipe Thermal Switch with Shape Memory Helical Actuators." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6222.
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This work reports on the design, fabrication and testing of a thermal switch wherein the open and closed states are actuated by shape memory alloy elements while heat is transferred by a heat-pipe. The motivation for such a switch comes from NASA's need for thermal management in advanced spaceport applications associated with future lunar and Mars missions. For example, as the temperature can approximately vary between 40 K to 400 K during lunar day/night cycles, such a switch can reject heat from a cryogen tank in to space during the night cycle while providing thermal isolation during the day cycle. By utilizing shape memory alloy elements in the thermal switch, the need for complicated sensors and active control systems are eliminated while offering superior thermal isolation in the open state. Nickel-Titanium-Iron (Ni-Ti-Fe) shape memory springs are used as the sensing and actuating elements. Iron (Fe) lowers the phase transformation temperatures to cryogenic regimes of operation while introducing an intermediate, low hysteretic, trigonal R-phase in addition to the usual cubic and monoclinic phases typically observed in binary NiTi. The R-phase to cubic phase transformation is used in this application. The methodology of shape memory spring design and fabrication from wire including shape setting is described. Heat transfer is accomplished via heat acquisition, transport and rejection in a variable length heat pipe with pentane and R-134a as working fluids. The approach used to design the shape memory elements, quantify the heat transfer at both ends of the heat pipe and the pressures and stresses associated with the actuation are outlined. Testing of the switch is accomplished in a vacuum bell jar with instrumentation feedthroughs using valves to control the flow of liquid nitrogen and heaters to simulate the temperature changes. Various performance parameters are measured and eported under both transient and steady-state conditions. Funding from NASA Kennedy Space Center for this work is gratefully acknowledged.M.S.
Masters
Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
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Shen, Huanhuan. "Interferometric out-of-focus imaging and digital holography for the characterization of droplets or bubbles : theory, optical design, characterization of a flow, synchronized experiments." Rouen, 2014. http://www.theses.fr/2014ROUES015.
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Un simulateur original d'imagerie interférométrique en défaut de mise au point (ILIDS), permettant de modéliser n'importe quel système optique, est développé. Le formalisme de ce simulateur repose sur l'intégrale de Huygens-Fresnel généralisée. Le champ initial diffusé par des gouttes est simplifié par deux glare points. Un système original d'ILIDS, utilisant une configuration cylindrique, est conçu grâce au simulateur. Cette nouvelle configuration permet d'obtenir simultanément la position en trois dimensions et la taille des gouttelettes ou des bulles. Elle comprend une lentille cylindrique supplémentaire ayant un angle de rotation approprié autour de l'axe optique. Cette configuration anamorphique permet de lier l'orientation des franges d'interférence d'une part, et la forme de l'image en défaut de mise au point d'autre part, à la position axiale de la particule. Trois expériences sont réalisées successivement : l'observation de gouttes d'eau dans l'air, de bulles dans l'eau au sein d'un aquarium cubique et de bulles dans la glycérine située dans un canal cylindrique. Les comparaisons entre simulations et expériences montrent des résultats cohérents. Les précisions des positions axiales et des talles obtenus par la configuration cylindrique d'ILILDS sont évaluées expérimentalement. Les positions axiales sont validées par une comparaison avec leurs valeurs calibrées, tandis que les diamètres sont vérifiés grâce à une configuration couplée deux techniques: holographie numérique sur l'axe et configuration cylindrique d'ILIDSAn original simulator of Interferometric Laser Imaging for Droplet Sizing (ILIDS), allowing predicting the image patterns obtained by any imaging system, is developed. The formalism of the simulator relies on the generalized Huygens-Fresnel integral. The initial field scattered by the droplet is simplified by two glare points. An original ILIDS system is designed due to the simulator. The advantage of this configuration is that the three dimensional locations and sizes of droplets can be obtained simultaneously. The cylindrical ILIDS configuration includes a supplemental cylindrical lens rotated in a proper angle with respect to the axis of imaging system. The anamorphic configuration allows to change the orientation of the fringes and the form of the out-of-focus image with respect to the axial location of the particle. Three experiments are successively conducted: water droplets in air, bubbles in water at cubic aquarium and bubbles in glycerin at cylindrical channel. The comparisons of the simulations and experiments show good consistence. The precisions of the axial location and diameter obtained by cylindrical ILIDS technique are evaluated experimentally. The axial locations obtained by cylindrical ILIDS configuration are validated by comparing them with calibrated values, while the diameters are validated due a synchronized experiment coupling Digital In-Line Holography technique and cylindrical ILIDS technique
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Riddell, Kevin Donald Alexander. "Design, testing and demonstration of a small unmanned aircraft system (SUAS) and payload for measuring wind speed and particulate matter in the atmospheric boundary layer." Thesis, Arts and Science, 2014. http://hdl.handle.net/10133/3416.
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The atmospheric boundary layer (ABL) is the layer of air directly influenced by the Earth’s surface and is the layer of the atmosphere most important to humans as this is the air we live in. Methods for measuring the properties of the ABL include three general approaches: satellite-based, ground- based and airborne. A major research challenge is that many contemporary methods provide a restricted spatial resolution or coverage of variations of ABL properties such as how wind speed varies across a landscape with complex topography. To enhance our capacity to measure the properties of the ABL, this thesis presents a new technique that involves a small unmanned aircraft system (sUAS) equipped with a customized payload for measuring wind speed and particulate matter. The research presented herein outlines two key phases in establishing the proof-of-concept of the payload and its integration on the sUAS: (1) design and testing and (2) field demonstration. The first project focuses on measuring wind speed, which has been measured with fixed wing sUASs in previous research, but not with a helicopter sUAS. The second project focuses on the measurement of particulate matter, which is a major air pollutant typically measured with ground- based sensors. Results from both proof-of-concept projects suggest that ABL research could benefit from the proposed techniques.
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Hillig, Mark Alexander. "Automated Channel Assessment for Single Chip MedRadio Transceivers." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1005.
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Modern implantable and body worn medical devices leverage wireless telemetry to improve patient experience and expand therapeutic options. Wireless medical devices are subject to a unique set of regulations in which monitoring of the available frequency spectrum is a requirement. To this end, implants use software protocols to assess the in-band activity to determine which channel should be used. These software protocols take valuable processing time and possibly degrade the operational lifetime of the battery. Implantable medical devices often take advantage of a single chip transceiver as the physical layer for wireless communications. Embedding the channel assessment task in the transceiver hardware would free the limited resources of the microprocessor. This thesis proposes hardware modifications to existing transceiver architectures which would provide an automated channel assessment means for implantable medical devices. The results are applicable beyond medical device applications and could be employed to benefit any low-power, wireless, battery-operated equipment.
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Scepanovic, Bogdan. "A programmable datalogger with universal inputs." Thesis, 2012. http://hdl.handle.net/10210/5806.
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M.Ing.This thesis describes a full design project of a processor based sophisticated measurement instrument - the datalogger. It covers the theoretical approach to the design project followed with hardware and software design. Many nonstandard solutions in hardware and software parts are used to approach a target, and they are fully described. The world that surrounds us today is full of products based on science and technology knowledge. These products are part of everyday life. The development of science and technology is very much depend upon a parallel development of measurement techniques and instruments. Measurement and the technology of measurement called instrumentation, serves not only science but all branches of engineering, medicine and almost every sphere of human life. Measuring instruments are used in the monitoring and control of processes and operations, too. Most specialised instruments, such as the datalogger, are used in experimental, research and develop science and engineering work. This thesis is organised into six chapters. The dataloger position in the measurement instruments tree is shown in the first chapter. The electronics design philosophy follows in the next chapter. It covers the most common problems found when the new design project starts. The global design strategy with brief description of all steps follows. The second chapter contains the datalogger project history, the reasons for going into the project, and the requests of the new device, too. At the end of this chapter the basic work principle of the datalogger is described to allow an easily following applied solutions. The third chapter covers all datalogger design specialities that make the datalogger design different from the design of other measurement instruments. It starts with remote sensors problems and problems commonly connected to the input stage of similar systems. The second half of this chapter analyses the instrument precision and error sources. There are several different methods that precision can be increased. Two methods applied here, reducing measurement range and oversampling with noise, are briefly described. The forth chapter interpretates the design of the processor board. It starts with a general microcontroller overview, describing the reasons for selecting the Hitachi microcontroller H8/532. The most important microcontroller characteristics are shown, too. The second part of this chapter contains the organisation, connections and contents of other electronics blocks in the processor board. At the end of this chapter the processor board schematic and full characteristics are given. The datalogger's hardware is described in the fifth chapter. The basic work principles of the various hardware parts are given in the beginning. The hardware is broken down and described in the following way: power electronics, digital control, signal processing part, and interface cards. All parts are covered with detailed descriptions of design circuit and the following calculation. The last chapter shows the software for the datalogger. It starts with the mathematical calculation principle developed and used in the datalogger. The customer part which follows covers software and hardware part relation between user and datalogger. One of the datalogger's software speciality is organisation of RAM space which allows high software flexibility of the datalogger as a measurement instrument. At the end the full datalogger program organisation is given on a global level.
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"Computational design and prototype development of optical prism for augmented reality projection." 2012. http://library.cuhk.edu.hk/record=b5549067.
Full textAbstract:
虛擬現實（VR）為用家提供了一個結合了人工場境和現實世界的練習環境。隨著在醫療，軍事和娛樂行業日益增長的需求，虛擬現實化的設備將會越來越受歡迎。頭戴式顯示器（HMD）是一種利用自由曲面的光學棱鏡，以投射由微型顯示器顯示的圖像，讓用家能夠在近距離觀看和體驗虛擬環境的產品。頭戴式顯示器由兩個基本部分組成，液晶顯示屏和一個光學元件，以能夠在很短的距離顯示圖像到用家的眼睛。光學自由曲面棱鏡在HMD研究中是一個主要的課題。設計的棱鏡需要運用大多數的光學理論和一些商業光學設計軟件的輔助。在市場，只有有限的光學軟件能深入地協助設計光學元件和系統。同時，成本高昂和不容易使用的光學軟件令到光學設計並不普及的原因。在下面的部分將用光學軟件ZEMAX去驗證每個設計。
自由曲面棱鏡的幾何形狀設計是為構建一個頭盔顯示器的關鍵問題。通常情況下，頭盔內自由曲面棱鏡由三面特別設計的非球面表面而組成。源圖像經過三個非球面反映後，可參照圖6，將圖像投射到人類視網膜上而形成圖像。棱鏡上的三個面的互相協調將是一個具有挑戰性的問題。
跟據現有的產品和研究分析，研發了一種新風格的棱鏡。在這篇論文中，由射線追踪和光學理論的幫忙，建議了一款凸-平棱鏡作HMD上的光學棱鏡。利用光學設計軟件分析和優化以追求一個可穿戴和低像差的光學棱鏡作目標。光學棱鏡中有兩個面為平面，因此光線能在棱鏡中穩步地轉化，從而，降低光學系統的像差。製作了經優化表面定位的原型，雖然原型是成本低，但它們比半透明的鏡子有一個更好的分辨率。在新設計的一個HMD上，一個廣闊和清晰的圖像將顯示。
Virtual reality (VR) provides an artificial environment to user for practicing under a synthetic environment which merges the real world with artificial scene. In response to the growing demand in medical, military and entertaining application, devices that can simulate VR will become more and more popular. Head mounted display (HMD) is a kind of wearable products that utilize freeform optical prisms to project images generated by microdisplays, enabling users to situate in virtual environments.
HMD has two basic components, a LCD and an optical element, to display image to naked eye in a short distance. An optical freeform prism will be a main research topic in HMD. To design the prism will require substantial knowledge in optical theory and the aid of some commercial optical design software. In the market, there is limited number of software for in depth optical analysis. Meanwhile, costly and not user-friendly software is a problem of unpopularity of optical design. Zemax has been used for verifying the each design in the below sections.
The design of geometric shape for the freeform prism is crucial for constructing a HMD. Typically, the freeform prisms inside HMD comprise of 3 specially designed aspherical surfaces. The source image is reflected by those three surfaces to form image on human retina. The interplay of three surfaces will is the main challenging problem. With the analysis of existing products and researches, a new-style prism is proposed. In this thesis, with the aid of ray tracing and optical theory, a convex-plano prism is developed.
Analyses of optical design software and optimization are utilized to pursue the goal of wearable and low aberration HMD optical prism. Prototypes with the optimized surfaces alignment are fabricated. With two flat surfaces on the prism, the rays translate steadily in the prism. Hence, the optical system’s aberration is reduced. Although the prototypes are low cost, they have a better resolution than half-transparent mirror. Also a wide and clear image will show on the new style see-through HMD.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Ho, Pui Lam.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2012.
Includes bibliographical references (leaves 57-59).
Abstracts also in Chinese.
Abstract --- p.i
Abstract (Chinese) 摘要 --- p.iii
Acknowledgement --- p.iv
List of Figure and Table --- p.vii
Paper published --- p.xi
Chapter Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Overview on Near Eye Display (NED) --- p.1
Chapter 1.2 --- Literature Review on HMD --- p.1
Chapter 1.3 --- Motivation and Research Objective --- p.7
Chapter 1.4 --- Thesis Outline --- p.8
Chapter Chapter 2 --- Fundamental Design Concept --- p.9
Chapter 2.1 --- Prism --- p.9
Chapter 2.2 --- Convex Lens --- p.11
Chapter 2.3 --- Combination of Convex lens and Regular Prism --- p.12
Chapter Chapter 3 --- Optical Design Analysis by Software Package --- p.16
Chapter 3.1 --- Surface Alignment --- p.16
Chapter 3.2 --- Distortion --- p.18
Chapter 3.3 --- MTF --- p.19
Chapter 3.4 --- Image Simulation --- p.20
Chapter 3.5 --- Aberration analysis --- p.21
Chapter 3.6 --- Aspherical surface --- p.22
Chapter Chapter 4 --- Design Principle and Procedure --- p.26
Chapter 4.1 --- Basic Criteria --- p.26
Chapter 4.2 --- See-throughPurpose --- p.27
Chapter 4.3 --- Material --- p.28
Chapter 4.4 --- SurfacesAlignment --- p.29
Chapter 4.5 --- Compensator --- p.30
Chapter 4.6 --- Angle Alignment --- p.30
Chapter Chapter 5 --- System Efficiency --- p.32
Chapter 5.1 --- System Efficiency --- p.32
Chapter 5.2 --- System Analysis --- p.35
Chapter Chapter 6 --- Prototype Fabrication and Testing --- p.38
Chapter 6.1 --- Display System --- p.38
Chapter 6.2 --- Monocular Configurations --- p.39
Chapter 6.3 --- Prototypes Building --- p.40
Chapter 6.4 --- Advantages --- p.54
Chapter 6.5 --- Limitation --- p.54
Chapter Chapter 7 --- Conclusions and Future Work --- p.55
Chapter 7.1 --- Conclusions --- p.55
Chapter 7.2 --- Future work --- p.55
Reference --- p.57
Appendix --- p.60
Chapter Appendix 1 --- Background Theory --- p.60
Chapter A1.1 --- Optical Theory --- p.60
Chapter A1.2 --- Matrix Method --- p.65
Chapter A1.3 --- Human Vision --- p.66
Chapter Appendix 2 --- Simulation of reflection --- p.67
Chapter Appendix 3 --- Aberration analysis of prisms --- p.70
Chapter Appendix 4 --- Specification --- p.71
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Dickens, Paul Physics Faculty of Science UNSW. "Flute acoustics: measurement, modelling and design." 2007. http://handle.unsw.edu.au/1959.4/40607.
Full textAbstract:
A well-made flute is always a compromise and the job of flute makers is to achieve a musically and aesthetically satisfying compromise; a task that involves much trial and-error. The practical aim of this thesis is to develop a mathematical model of the flute and a computer program that assists in the flute design process. Many musical qualities of a woodwind instrument may be calculated from the acoustic impedance spectrum of the instrument. A technique for fast and accurate measurement of this quantity is developed. The technique is based on the multiple-microphone technique, and uses resonance-free impedance loads to calibrate the system and spectral shaping to improve the precision at impedance extrema. The impedance spectra of the flute and clarinet are measured over a wide range of fingerings, yielding a comprehensive and accurate database. The impedance properties of single finger holes are measured using a related technique, and fitformulae are derived for the length corrections of closed finger holes for a typical range of hole sizes and lengths. The bore surface of wooden instruments can change over time with playing and this can affect the acoustic impedance, and therefore the playing quality. Such changes in acoustic impedance are explored using wooden test pipes. To account for the effect of a typical player on flute tuning, an empirical correction is determined from the measured tuning of both modern and classical flutes as played by several professional and semi-professional players. By combining the measured impedance database with the player effects and various results in the literature a mathematical model of the input impedance of flutes is developed and implemented in command-line programs written in the software language C. A user-friendly graphical interface is created using the flute impedance model for the purposes of flute acoustical design and analysis. The program calculates the tuning and other acoustical properties for any given geometry. The program is applied to a modern flute and a classical flute. The capabilities and limitations of the software are thereby illustrated and possible contributions of the program to contemporary flute design are explored.
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Blom, C. "Karakterisering van makroskopiese oppervlakgrofheid met behulp van akoestiese golwe." Thesis, 2014. http://hdl.handle.net/10210/12195.
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Stevens, Darren W. "Design and architecture of an improved microcomputer-controlled perturbed angular correlation spectrometer." Thesis, 1992. http://hdl.handle.net/1957/37318.
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Ruizpalacios, Rodrigo. "Laser direct-write of optical components prepared using the sol-gel process." Thesis, 2004. http://hdl.handle.net/2152/1399.
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Marsh, Jasmina Pozderac. "Production and evaluation of silicon diffractive optics for infrared astronomy." Thesis, 2006. http://hdl.handle.net/2152/2772.
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Shinpaugh, Jefferson L. "Design of a high-efficiency, high-resolution x-ray spectrometer for 1s Lamb shift measurements." 1985. http://hdl.handle.net/2097/27538.
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Elloian, Jeffrey. "Design of a Flexible Ultrasound Phased Array with Adaptive Phasing for Curvature." Thesis, 2021. https://doi.org/10.7916/d8-d1kz-kq89.
Full textAbstract:
Diagnostic ultrasound has become invaluable to healthcare professions for the purpose of imaging soft tissue without the risk of exposure to damaging, ionizing radiation. However, the majority of commercially available transducers have rigid, fixed interfaces that cannot conform to the surface of the human body. Such limitations both introduce a potential air gap (requiring the application of ultrasound gel) and make long-term monitoring impractical. In this work, I propose a novel flexible 2D ultrasound phased array with adaptive phasing that is capable of compensating for the radius of curvature. I describe the phasing algorithm and illustrate the detrimental effect of a lack of phase correction through simulation. I conduct phase detection by using time of arrival (TOA) without additional external hardware. In addition to simulations, I provide details of the fabrication process of a flexible 16 by 16 element array. The manufactured array, with an operating frequency of 1.4MHz and bandwidth of 41.3%, was capable of generating pressures up to 600 kPa. Finally, I conduct an in-vivo human study to demonstrate the functionality of the array on a human humerus. Although visible without phase correction, the location of the bone can easily be tracked in real-time after applying the correction algorithm.
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Feliz, Yazmin. "UltrasonOS: The Development of an Open-Source Portable Ultrasound System for Medical Imaging." Thesis, 2021. https://doi.org/10.7916/d8-6vr9-3f26.
Full textAbstract:
With over half a century of medical ultrasound support, proven efficacy, and increased popularity, why is it that over half our planet’s population does not have access to ultrasound imaging? In 2015 when I joined the doctoral program, I embarked to not only understand this problem but to provide a solution. This document will walk you through this journey, detailing the challenge of creating my very own ultrasound system with the purpose of it being highly accessible to people who need it the most. I had the vision to take this further; not only did I aim to create an open-source portable ultrasound- I also wanted to see this in the hands of users.
This dissertation will show you how collaboration between students of varying disciplines can help propel research to the point of product development. A full ultrasound system including both hardware and software has been developed and tested using commercial ultrasound phantoms. This document will present progress chronologically, starting with the first attempts at using audible piezoelectric buzzers to generate a signal, where the first proof of concept is met. In this dissertation, you will follow the continuous development of a 1) ultrasound analog circuit, 2) mechanical transducer probe, 3) analog signal acquisition system, and 4) imaging software coupled with the user interface.
The open-source portable ultrasound research has been successful in providing both hardware and software solutions, combined as a single package in an end-to-end integrated system. This has never been done before. During a time when “data is gold”, this project has also created an open platform where users can collect and share data, enabling collaborations and propulsion of open-access medical screening technologies. This research has developed the lowest-cost 3D scanning ultrasound transducer that we know of at this time. This is inherently novel and transcendental.
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Elorriaga, Montenegro Estefania. "High frequency water vapor density measurements using the beat frequency method." Thesis, 2012. http://hdl.handle.net/1957/30841.
Full textAbstract:
This document describes the design and deployment of a first generation water vapor density sensing unit, the HumiSense. This device is based on an open, air-filled capacitor which is part of a resonant circuit. The frequency of the resonant circuit mixed with a fixed frequency oscillator is the basis of the method to generate a signal that is associated to the change in water vapor density within the open capacitor with time. The physical testing results were inconclusive given that there were many unresolved artifacts in the data. Several suggestions for improving the device for future device generations were provided.Graduation date: 2013