Дисертації з теми "Interferometry diagnostics"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-31 дисертацій для дослідження на тему "Interferometry diagnostics".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Bishop, Alexis Ivan. "Spectrally selective holographic interferometry techniques for flow diagnostics /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16305.pdf.
Повний текст джерелаAustin, Dane R. "High-resolution interferometric diagnostics for ultrashort pulses." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:03ff32ea-c82a-4a42-9c6b-11e42ddb1e67.
Повний текст джерелаLwin, Mark. "A novel velocity interferometer using polarisation multiplexing and an extended source." Thesis, Queensland University of Technology, 2002.
Знайти повний текст джерелаBoniface, Claude. "Modélisation et diagnostics d'un propulseur à effet Hall pour satellites : configuration magnétique et nouveaux concepts." Toulouse 3, 2006. http://www.theses.fr/2006TOU30016.
Повний текст джерелаHall Effect Thrusters (HETs) are gridless ion engines where a magnetic field barrier is used to impede the electron motion toward the anode and generate a large electric field that provides collisionless ion acceleration. The thrust is about 100 mN and the specific impulse of HETs is in the range 1600-2000 s (i. E. The velocity of ejected xenon ions is on the order of 16-20 km/s). The thrust and the specific impulse of standard Single Stage HETs are well adapted to the missions of orbit correction and station keeping. The goal here is to model the physical phenomena occurring in such a thruster, and, in correlation with experimental studies, to validate and/or improve the assumptions of the model. The model describes the transport of the electrons, ions, and neutrals in crossed electric and magnetic fields. The model developed at CPAT was extended and used to identify conditions for optimal operation of the thruster, with particular attention to the influence of the magnetic field distribution on the thruster operation. In addition, we developed a model to study new thuster concepts such as a Double Stage Hall Effect Thruster, where ionization and acceleration are accomplished in two stages. The experimental study involved using specific plasma diagnostics (Fabry-Perot Interferometry) in order to measure the electric field distribution in the thruster. Measurements were made at the PIVOINE test facility in Orléans. Systematic comparisons between experimental results and simulations allowed us to define more clearly the limits of the model and to improve its predictive ability
Kline, Loren A. "Microwave Interferometry Diagnostic Applications for Measurements of Explosives." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1783.
Повний текст джерелаKasten, Cale Phillip. "Two-Color interferometry as a fluctuation diagnostic on Alcator C-Mod." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82457.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 139-147).
The two-color interferometer diagnostic on Alcator C-Mod has been upgraded to measure line-integrated electron density fluctuations for turbulence and transport studies. Heterodyne signals from ten vertical-viewing CO2 laser chords are demodulated relative to a local oscillator using high bandwidth analog in-phase/quadrature electronics, replacing lower bandwidth digital fringe counting electronics. The raw outputs of the high bandwidth electronics, which are proportional to the sine and cosine of the interferometric phase shift, are digitized at up to 10 MHz, which is sufficient for fluctuation analysis. Extraction of the measured phase from the sine and cosine signals is now performed entirely in software, providing the line-integrated electron density at high bandwidth. The interferometer design, calibration, and measurement uncertainty is presented. Measurement uncertainties due to nonlinearities in the analog electronics are found to be comparable to the uncertainties of the previous system. The interferometer can now resolve line-integrated electron density fluctuations with major-radial wavenumbers below ... . The new fluctuation measurement capability is used to partially verify the calibration and low-kR wavenumber response of phase-contrast imaging, to aid in gyrokinetic transport model validation research. Agreement between the two diagnostics is demonstrated for broadband fluctuations and the low-kR component of the quasi-coherent mode, improving confidence in the calibration of the phase-contrast imaging system. Both diagnostics observe a series of fluctuations during quasi-steady periods of minority heated I-mode plasmas with strong off-axis electron heating. The observed fluctuations are localized to the plasma core using Doppler shift analysis and data from edge fluctuation diagnostics. Transport analysis shows that the fluctuations do not correlate with enhanced thermal transport, and gyrokinetic linear stability analysis shows that the plasma is stable to drift wave turbulence, ruling out the possibility that the observed fluctuations are destabilized drift wave turbulence.
by Cale Phillip Kasten.
S.M.
Lee, Julian 1966. "Development of a broadband microwave interferometer for diagnostic measurements of detonations." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61307.
Повний текст джерелаThe waveguide or detonation tube of the present microwave interferometer consisted of a copper tube 38.4 mm in diameter, 3.5 m long, with a thin wire stretched along the center axis acting as a center conductor for the coaxial configuration. The system was tested at microwave frequencies of 6.70GHz and 9.21GHz by performing a number of detonation experiments in explosive gaseous mixtures of C$ sb2$H$ sb2$ + 2.5O$ sb2$ and C$ sb3$H$ sb8$ + 5O$ sb2$, at low initial pressures (6torr to 80torr). Average velocity measurements obtained by the microwave method generally agreed with independent photodetector measurements to within 2%.
In this study, the present technique has been used to explore unstable detonations near the limit. This demonstrates that the improved microwave Doppler interferometer is particularly well suited for unstable detonations where the large scale velocity fluctuations must be monitored continuously. It may be concluded that the present coaxial configuration microwave Doppler interferometry technique shows promise as a useful diagnostic tool for studying unstable detonations. (Abstract shortened by UMI.)
Reddington, Alexander P. "Instrument design and optimization of interferometric reflectance imaging sensors for in vitro diagnostics." Thesis, Boston University, 2014. https://hdl.handle.net/2144/11031.
Повний текст джерелаIn the field of drug discovery and disease diagnostics, protein microarrays have generated much enthusiasm for their high-throughput monitoring of biomarkers; however, this technology has yet to translate from research laboratories to commercialization. The hindrance is the considerable uncertainty and skepticism regarding data obtained. The disparity in results from different laboratories performing identical tests is attributed to a lack of assay quality control. Unlike DNA microarrays, protein microarrays have a higher level of bioreceptor immobilization variability and non-specific binding because of the more complex molecular structure and broader physiochemical properties. Traditional assay detection modalities, such as fluorescence microscopy and surface plasmon resonance, are unable to overcome both of these sources of variation. This dissertation describes the hardware and software design and biological validation of three complementary platforms that overcome bioreceptor variability and non-specific binding for diagnostics. In order to quantify the bioreceptor quality, a label-free, nondestructive, low cost, and high-throughput interferometric sensor has been developed as a quality control tool. The quality control tool was combined with a wide-field fluorescence imaging system to improve fluorescence experimental repeatability. Lastly, a novel high-throughput and label-free platform for quality control and specific protein microarray detection is described. This platform overcomes the additional complexities and time required with labeled assays by discriminating between specific and nonspecific detection by including sizing of individual binding events. Protein microarrays may one day emerge as routine clinical laboratory tests; however, it is important that the proper quality control procedures are in place to minimize erroneous results. These platforms provide reliable and repeatable protein microarray measurements for new advancements in disease diagnostics with the potential for drug discovery.
Trad, Georges. "Développement et optimisation des diagnostiques des faisceaux du LHC et du SPS basé sur le suivi de la lumière synchrotron." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY005/document.
Повний текст джерелаMeasuring the beam transverse emittance is fundamental in every accelerator, in particular for colliders, where its precise determination is essential to maximize the luminosity and thus the performance of the colliding beams. Synchrotron Radiation (SR) is a versatile tool for non-destructive beam diagnostics, since its characteristics are closely related to those of the source beam. At CERN, being the only available diagnostics at high beam intensity and energy, SR monitors are exploited as the proton beam size monitor of the two higher energy machines, the Super Proton Synchrotron (SPS) and the Large Hadron Collider (LHC). The thesis work documented in this report focused on the design, development, characterization and optimization of these beam size monitors. Such studies were based on a comprehensive set of theoretical calculations, numerical simulations and experiments.A powerful simulation tool has been developed combining conventional softwares for SR simulation and optics design, thus allowing the description of an SR monitor from its source up to the detector. The simulations were confirmed by direct observations, and a detailed performance studies of the operational SR imaging monitor in the LHC, where different techniques for experimentally validating the system were applied, such as cross-calibrations with the wire scanners at low intensity (that are considered as a reference) and direct comparison with beam sizes de-convoluted from the LHC luminosity measurements.In 2015, the beam sizes to be measured with the further increase of the LHC beam energy to 7 TeV will decrease down to ∼190 μm. In these conditions, the SR imaging technique was found at its limits of applicability since the error on the beam size determination is proportional to the ratio of the system resolution and the measured beam size. Therefore, various solutions were probed to improve the system’s performance such as the choice of one light polarization, the reduction of depth of field effect and the reduction of the imaging wavelength down to 250 nm.In parallel to reducing the diffraction contribution to the resolution broadening, the extraction mirror, found as the main sources of aberrations in the system was redesigned. Its failure was caused by the EM coupling with the beam’s fields that led to overheating and deterioration of the coating. A new system’s geometry featuring a smoother transition in the beam pipe was qualified in terms of longitudinal coupling impedance via the stretched wire technique. A comparison with the older system was carried out and resulted in a reduction of the total power dissipated in the extraction system by at least a factor of four.A new, non-diffraction limited, SR-based monitor based on double slit interferometry was designed as well as an alternative method to the direct imaging. Its principle is based on the direct relation between the interferogram fringes visibility and the beam size.Since the beam emittance is the physical quantity of interest in the performance analysis of the LHC, determining the optical functions at the SR monitors is as relevant as measuring the beam size. The “K-modulation” method for the optical function determination was applied for the first time in the LHC IR4, where most of the profile monitors sit. The βs at the quadrupoles were measured and via two different propagation algorithms the βs at the BSRT and the WS were obtained reducing significantly the uncertainty at the monitors location
Nikitine, Dmitri. "Optical and X-Ray Diagnostics of the Formation of Laser-Induced Plasmas in Gases and Vacuum." Doctoral thesis, Universitätsbibliothek Chemnitz, 2004. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200401345.
Повний текст джерелаLi, Jingxuan. "Development of novel diagnostic techniques to measure heat release rate perturbations in flames." Phd thesis, Ecole Centrale Paris, 2012. http://tel.archives-ouvertes.fr/tel-00997413.
Повний текст джерелаLongstaff, Wilmer Gregg. "Three-dimensional analysis of optical transition radiation." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23428.
Повний текст джерелаA three dimensional analysis of the intensity distribution of backward optical transition radiation has been performed. The effects of variations in electron energy and beam divergence and on material properties such as dielectric permittivities and the resultant coherence length upon the angular distribution and polarization of optical transition radiation has been investigated. A surprising observation important to the use of optical transition radiation as a diagnostic tool for high energy electron beams is the behavior of the perpendicular component of the intensity. In contrast to low energies where the parallel component dominates, at electron energies above 200 MeV, the perpendicular component dominates. This requires the use of a polarization filter to diagnose particle beam properties at high energies.
http://archive.org/details/threedimensional00long
Lieutenant, United States Navy
Leslie, Kevin A. "Evaluation and Adaptation of Live-Cell Interferometry for Applications in Basic, Translational, and Clinical Research." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5562.
Повний текст джерелаDavis, Arthur. "Tomographie par cohérence optique confocale en ligne multimodale pour le diagnostic non invasif des cancers cutanés." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLO004/document.
Повний текст джерелаSkin cancer is a major public health issue. Among all types of cancer, skin cancer has the highest prevalence rate and the number of cases seems to be steadily increasing. Currently, the gold standard of skin cancer diagnosis requires a sample of suspicious tissue, called a biopsy, removed after a simple visual inspection of the patient's skin. Consequently, almost 60 % of biopsies result in benign diagnoses, and approximately 20 % of all skin cancers are missed.The research presented in this thesis revolves around the development of a line-field confocal optical coherence tomography (LC-OCT) device capable of producing non-invasive in vivo images similar in quality to histological cuts. The designed prototype operates at a center wavelength around 800 nm with a spectral width of approximately 150 nm. It has been applied to in vivo skin imaging with an almost isotropic spatial resolution of about 1 µm and a depth penetration reaching 400 µm. This device could thus be used to improve the efficiency of skin cancer diagnosis by limiting the number of undiagnosed cases and the number of unnecessary biopsies.We then present a LC-OCT device system operating in two spectral bands centered around 770 nm and 1250 nm. The first band produces high resolution images (1.3 µm x 1.2 µm, lateral x axial) while the second provides enhanced penetration depth (700 µm). By merging the images acquired in the two bands it has been possible to produce images with both high resolution and high penetration. Moreover, acquiring images of a sample in two different spectral bands can give, to a certain extent, information on the spectral properties of the sample.Lastly, we present a proof-of-concept LC-OCT prototype coupled together with a Raman microscope, as well as some application examples. Raman microscopy is a spectroscopic method capable of identifying molecules present in a sample and thus measuring the "fingerprint" of a sample. This modality could then provide complementary information to the morphological images provided by LC-OCT about the biomolecular composition of the sample
Blaudeck, Thomas. "Diagnostik an laserinduzierten Plasmakanälen und Mikropinchstrukturen mittels Kurzzeitinterferometrie und zeitaufgelöster Röntgenspektroskopie." Master's thesis, Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200201615.
Повний текст джерелаDie Arbeit beschäftigt sich mit der Wechselwirkung intensiver 100-ps-Laserpulse eines Nd:YAG-Lasersystems mit Zweischicht-Folientargets, die aus einer dielektrischen Schicht (Mylar) und einer metallischen Schicht bestehen. Die entstehenden Plasmen werden mittels Kurzzeitinterferometrie und zeitaufgelöster Röntgenspektroskopie sowie mit Methoden der Ionendosimetrie in Polymer-Kernspurätzdetektoren (CR-39) untersucht
Sanjuán, Muñoz Josep. "Development and validation of the thermal diagnostics instrumentation in lisa pathfinder." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/6366.
Повний текст джерелаNon-inertial forces perturbing the TMs must be less than 6 fN/sqrt(Hz) in the frequency range of 0.1 mHz to 0.1 Hz and the noise in the measurement between the TMs (separated by 5 Gm) must be of 40 pm/sqrt(Hz) in the same band. To reduce the risks of a direct launch of LISA, ESA has decided to first launch LPF to put all the LISA technologies to test.
The payload of LPF, the LISA Technology Package (LTP), contains two TMs placed in two cylinders inside a single spacecraft (SC) and an interferometric system that measures the relative distance between them. The SC isolates the TMs from the external disturbances but internal stray forces will still perturb the TMs. Their levels must be bounded not to challenge the free fall accuracy. One of these disturbances is temperature fluctuations and the aspects related to their measurement are the leitmotif of this thesis.
In chapter 1 we have presented how temperature fluctuations couple into the key subsystems of the LTP to degrade their performance. The foreseen effects are radiation pressure, radiometer effect, temperature coefficient of optical components, etc. Onground estimations conclude that the temperature stability in the LTP must be less than 100 microK/sqrt(Hz) in the frequency range of 1 mHz to 30 mHz (LTP band). Since temperature fluctuations are an important issue in LPF and in LISA, a thermal diagnostic subsystem is needed aboard both missions.
The task of the thermal diagnostics in the LTP is twofold: on the one hand, temperature fluctuations in different subsystems must be measured with noise levels of 10 microK/sqrt(Hz) in the LTP band. On the other hand, a set of heaters will generate heat pulses that in conjunction with temperature measurements will be used to estimate the actual coupling between temperature and systems performance. These actions will provide information on the behaviour of the system and will permit to identify the fraction of noise in the system coming from temperature issues. The main function of LPF, as precursor mission of LISA, is the understanding of all the noise sources in the system. This will provide clues to the final leap from LPF sensitivity to LISA one.
The main investigations carried out during this thesis can be split into three main categories: (i) the design and validation of the LTP temperature measurement subsystem (TMS); (ii) the extension of the system to the LISA requirements; and (iii) the analysis of the in-flight thermal experiments in the LTP. The thesis is organised as follows: in chapter 2 we describe the designed electronics and the temperature sensors chosen. Aspects related to the coupling of the TMS with other subsystems nearby are discussed in chapter 3. Chapter 4 focuses on the design of the testbed needed for the validation of the TMS. Two different testbeds are described: one for the LTP measurement bandwidth (MBW) and another one for the LISA MBW, 0.1 mHz. In chapter 5 we present the results of the test campaigns: the prototype, the engineering model and the flight model systems were put to test. The results of the investigations in the LISA band are also shown. Chapter 6 contains investigations in view of LISA requirements to reduce excess noise at very low frequency and to reduce the floor noise of the measurement. Chapter 7 focuses on the thermal experiment on-board LPF: a set of thermal excitations are proposed to extract information of the thermal behaviour of the key subsystems of the LTP.
Mielke, Amy Florence. "DEVELOPMENT OF A MOLECULAR RAYLEIGH SCATTERING DIAGNOSTIC FOR SIMULTANEOUS TIME-RESOLVED MEASUREMENT OF TEMPERATURE, VELOCITY, AND DENSITY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1196429607.
Повний текст джерелаLullin, Justine. "Design, simulation and fabrication of a vertical microscanner for phase modulation interferometry - Application to optical coherence tomography system for skin imaging." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2010/document.
Повний текст джерелаThis thesis describes the design, simulation and fabrication of a vertically actuated 4x4 array ofmicromirrors with embedded position sensing function. The vertical microscanner is meant to beintegrated within an array-type Mirau microinterferometer realized with optical microcomponentsfabricated using collective techniques. The microscanner, developed in this thesis, provides areference signal that is used for the implementation of phase modulation interferometery in an opticalcoherence tomography (OCT) system. This thesis first introduces the need for adapted imagingsystems for the early diagnosis of skin cancer and establishes the optical specifications requiredby this specific application. Based on these specifications, the design of the OCT system based onthe Mirau microinterferometer is presented. In parallel, the state of the art of the microactuationtechnologies is discussed and comb drive electrostatic actuation is chosen, for its compatibilitywith the design of the Mirau microinterferometer, to actuate and sense the position of the array ofmicromirrors. Then, the core of the thesis deals with the development of the vertical microscanner,i.e. its design and simulations, its fabrication and its characterization
Girardeau, Vadim. "Imagerie photo-acoustique à détection optique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT049/document.
Повний текст джерелаIn the context of an aging population, it is essential to develop clinical diagnostic tools that are accurate, reliable, inexpensive and easy to implement. During this thesis I particularly sought to perform a dynamic mapping of blood vessels in order to detect both cancers and cardiovascular diseases, two of the most deadly diseases. In order to have an effective diagnosis, it is necessary to image in depth with the best possible spatial and temporal resolution. In chapter 0 I explain the challenges of medical imaging on micro-vascularization by analyzing the advantages and disadvantages of several types of medical imaging. In chapter 1 I develop in detail the photo-acoustic imaging, which proved to be the most appropriate for our application. It has the advantage of optical contrast and acoustic resolution. In particular, I use frequency photo-acoustics, which is inexpensive and space-saving, and can therefore be easily integrated in the hospital world compared to "traditional" photo-acoustic imaging. I validate this part on in-vivo experimental results on mouse ears. In chapter 2 I tried to detect the photo-acoustic signal in an optical way which has the advantage of being contactless and therefore without any problem of clutter between "optical excitation" and "acoustic detection". I develop the signal processing necessary to detect an acoustic wave, i.e. vibrations, using an interferometer. Then I present in chapter 3 a particular interferometer developed in the laboratory: the Laser Optical Feedback Imaging (LOFI). This interferometer allows to be limited to photon noise even with a low intensity thus it makes it possible to detect vibrations of small amplitudes even on surfaces with a low reflecting index like the skin in accordance with medical standards. In chapter 4 I validate the detection of the photo-acoustic signal with our optical detection. Finally in chapter 5 I show with simulations an innovative full field imaging technique that would allow faster detection of a spectrally rich photo-acoustic signal
Ouldarbi, Lila. "Imagerie interférométrique en défaut de mise au point pour des mesures de particules discrètes en volume et la reconnaissance de forme de particules irrégulières." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR050/document.
Повний текст джерелаSubmerged structures such as tidal turbines generate turbulent flows that can strongly disrupt the seabed. Understanding the impact of the presence of these structures requires understanding the three-dimensional dynamics of the vortices they generate. Optical methods, by their non-intrusive aspect, make it possible to analyze these dynamics. Interferometric Particle Imaging is a technique originally developed for the measurement of transparent spherical particles such as droplets orbubbles. We offer here an extension of this technique for the simultaneous characterization of irregular and spherical particles in a flow. A first experimental set-up has confirmed the validity of the method for the size and three-dimensional position measurement of grains of sand and air bubbles in water. A second device was used on a wave flume of bigger dimensions, introducing the notions of three-dimensional tracking of irregular particles and the analysis of the variation of their orientation.A third device made of two Interferometric Particle Imaging set-ups at two angles of observation is described for the shape recognition of different families of irregular particles. Through comparisons with simulations, dimensions and orientations of these particles are determined. This kind of device should be suitable for the characterization of ice crystals for which various shapes are known. The prospects that such results provide include the extension of the technique to the particle velocitymeasurement in hostile conditions, combined with the shape recognition and the determination of rotation of particles
Perrin, Stephane. "Development and characterization of an optical coherence tomography micro-system : Application to dermatology." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2002/document.
Повний текст джерелаThe manuscript concerns the optical design and the development of a non-invasive new imagingsystem for the early diagnosis of skin pathologies. Indeed, an early diagnosis can make the differencebetween malignant and benign skin lesion in order to minimize unnecessary surgical procedure.Furthermore, prognosis for the year 2015 was that more than three millions new skin cancer caseswill be diagnosed in the United States. Based on the swept source optical coherence tomographytechnique in full-field and multiple channels configuration, the imaging system is able to perform avolumetric image of the subsurface of the skin, and thus can help in taking a better medical decision.Furthermore, for a batch-fabrication of the hand-held device, micro-optical components were made atwafer-level and vertically assembled using multi-wafer bonding. This miniaturized system requiresspecific characterization. Thus, two systems were also developed for imaging quality evaluation ofmicro-optical elements. This work has been supported by the VIAMOS (Vertically Integrated ArraytypeMirau-based OCT System) European project
Xiao, Yi-Fan, and 蕭帆邑. "Microwave Interferometry Diagnostics." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/62902378906064279874.
Повний текст джерела國立成功大學
物理學系碩博士班
97
In this paper, we develop a microwave interferometry system for plasma diagnostics.. First, we discuss the EM wave propagation in magnetized plasma. The dispersion relation of EM wave will be changed by the angle between the magnetic field and EM wave propagation direction, so we can use it to measure and calculate the plasma density. Because our magnetized plasma system is still not operative, we instead measure the dielectric constant of Teflon to test and verify our interferometry system. We also use the network analyzer to confirm the accuracy of interferometry. Finally, we consider the future work of the microwave interferometry for plasma diagnostics.
Syu-JheWang and 王勗哲. "Development of Microwave Interferometry System for Magnetized Plasma Diagnostics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/88004724440680857027.
Повний текст джерела國立成功大學
太空天文與電漿科學研究所
99
In the thesis, we develop a microwave interferometer system to measure the line-integrated plasma density. At first, we discuss the EM wave propagation in magnetized plasmas by using the plasma wave theory. The EM wave dispersion relation depends on the direction of the wave electric field with respect to the external magnetic field. We can use the dispersion relation to obtain the relation between the phase delay of the probe wave and the line-integrated plasma density. The interferometry system measures the phase delay and is a non-contact instrument for the plasma density measurement in magnetized plasmas. The EM wave is divided into two paths: the probe wave passes through the plasma and the other wave serves as the reference signal. We use mixers to combine the two signals and obtain the phase difference to calculate the plasma line-integrated density. The plasma line-integrated density is on the order of 1015?1017 m-2 in the magnetic mirror plasma device at the Plasma and Space Science Center (PSSC) at the National Cheng Kung University (NCKU). Finally, we discuss what can be improved in the future.
Hägg, Linus. "Plasma diagnostics for particle confinement studies in magnetic fusion devices." Thesis, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-365739.
Повний текст джерелаFusionsvetenskap strävar efter att producera en ny, effektiv energikälla. I och med den ökande energikonsumtionen får fusionsvetenskap en allt viktigare roll i samhället. Kärnfusion har stor potential som energikälla, men att utvinna dess energi kommer med lika stora tekniska utmaningar. I det här projektet tacklas en av dessa utmaningar; att mäta elektrontätheten och joniseringshastigheten i ett plasma. Detta utfördes på EXTRAP T2R, ett magnetiskt inneslutningssystem för plasma på Alfvén laboratoriet, Kungliga Tekniska högskolan, Stockholm. Projektet behandlar två olika mätinstrument: En interferometer som mäter elektrontätheten i plasmat och en H-alphaexperimentuppställning som mäter joniseringshastigheten i plasmat. Interferometern har uppgraderats och justerats för att ge mer tillförlitliga mätningar. Den behöver förbättras ytterligare men kan ger nu tillförlitliga täthetsmätningar i början av plasma-skott. H$\alpha$-experimentuppställningen har karakteriserats och kalibrerats. Genom att mäta elektrontätheten och joniseringshastigheten kan partikelinneslutningstiden uppskattas. Partikelinneslutningstiden är den genomsnittliga tiden innan en partikel lämnar plasmat via en av många processer. Denna uppskattning baserades på två möjliga täthetsprofiler i plasmat eftersom en fullständig mätning skulle kräva flera interferometrar. Trots detta så stämmer uppskattningen väl överens med tidigare studier.
Sung, Pei-Hsung, and 宋佩勳. "Dark central ground interferometry (D.C.G.I) and its application to flame diagnostics." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/31405281415631413153.
Повний текст джерелаDu, Dongsu 1985. "Diagnostics for the Texas Petawatt laser-plasma accelerator." 2010. http://hdl.handle.net/2152/9540.
Повний текст джерелаtext
Oliver, David. "An electronically scanned interferometer for electron density measurement on the H-1 Heliac." Phd thesis, 2008. http://hdl.handle.net/1885/150951.
Повний текст джерелаGiacomelli, Michael Gene. "Diagnostic Imaging and Assessment Using Angle Resolved Low Coherence Interferometry." Diss., 2012. http://hdl.handle.net/10161/5801.
Повний текст джерелаThe redistribution of incident light into scattered fields ultimately limits the ability to image into biological media. However, these scattered fields also contain information about the structure and distribution of protein complexes, organelles, cells and whole tissues that can be used to assess the health of tissue or to enhance imaging contrast by excluding confounding signals. The interpretation of scattered fields depends on a detailed understanding of the scattering process as well as sophisticated measurement systems. In this work, the development of new instruments based on low coherence interferometry (LCI) is presented in order to perform precise, depth-resolved measurements of scattered fields. Combined with LCI, the application of new light scattering models based on both analytic and numerical methods is presented in order to interpret scattered field measurements in terms of scatterer geometry and tissue health.
The first portion of this work discusses the application of a new light scattering model to the measurement recorded with an existing technique, Angle Resolved Low Coherence Interferometry (a/LCI). In the a/LCI technique, biological samples are interrogated with collimated light and the energy per scattering angle at each depth in the volume is recorded interferometrically. A light scattering model is then used to invert the scattering measurements and measure the geometry of cell nuclei. A new light scattering model is presented that can recover information about the size, refractive index, and for the first time, shape of cell nuclei. This model is validated and then applied to the study of cell biology in a series of experiments measuring cell swelling, cell deformation, and finally detecting the onset of apoptosis.
The second portion of this work introduces an improved version of a/LCI based on two dimension angle resolved measurement (2D a/LCI) and Fourier domain low coherence interferometry (FD-LCI). Several systems are presenting for high speed and polarization-resolved measurements of scattered fields. An improved light scattering model based on fully polarization and solid angle resolved measurements is presented, and then efficiently implemented using distributed computing techniques. The combined system is validated with phantoms and is shown to be able to uniquely determine the size and shape of scattering particles using a single measurement.
The third portion of this work develops the use of angle-resolved interferometry for imaging through highly scattering media by exploiting the tendency of scatterers to forward scatter light. A new interferometers is developed that can image through very large numbers of scattering events with acceptable resolution. A computational model capable of reproducing experimental measurements is developed and used to understand the performance of the technique.
The final portion of the work develops a method for processing 2D angle resolved measurements using optical autocorrelation. In this method, measurements over a range of angles are fused into a single depth scan that incorporates the component of scattered light only from certain spatial scales. The utility of the technique is demonstrated using a gene knockout model of retinal degeneration in mice. Optical autocorrelation is shown to be a potentially useful biomarker of tissue disease.
Dissertation
Warr, George B. "A multi-view interferometer for electron density tomography on the H-1NF heliac." Phd thesis, 1998. http://hdl.handle.net/1885/145724.
Повний текст джерелаRomanuik, Sean. "A microflow cytometer with simultaneous dielectrophoretic actuation for the optical assay and capacitive cytometry of individual fluid suspended bioparticles." 2009. http://hdl.handle.net/1993/3205.
Повний текст джерелаThiele, Olaf. "Faseroptische Gemischbildungsanalyse in Otto-Motoren bei direkteinspritzenden Brennverfahren." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-B441-3.
Повний текст джерела