Dissertations / Theses on the topic 'Time domain'
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Spangenberg, Dirk-Mathys. "Time domain ptychography." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96735.
Full textENGLISH ABSTRACT: In this work we investigate a new method to measure the electric field of ultrafast laser pulses by extending a known measurement technique, ptychography, in the spatial domain to the time domain which we call time domain ptychography. The technique requires the measurement of intensity spectra at different time delays of an unknown temporal object and a known probe pulse. We show for the first time by measurement and calculation that this technique can be applied with excellent results to recover both the amplitude and phase of a temporal object. This technique has several advantages, such as fast convergence, the resolution is limited by the usable measured spectral bandwidth and the recovered phase has no sign ambiguity. We then extend the technique to pulse characterization where the probe is derived form the temporal object by filtering meaning the probe pulse is also unknown, but the spectrum of the probe pulse must be the same as the spectrum of the temporal object before filtering. We modify the reconstruction algorithm, now called ptychographic iterative reconstruction algorithm for time domain pulses (PIRANA), in order to also reconstruct the probe and we show for the first time that temporal objects, a.k.a laser pulses, can be reconstructed with this new modality.
AFRIKAANSE OPSOMMING: In hierdie werk het ons ’n nuwe metode ondersoek om die elektriese veld van ’n ultravinnige laser puls te meet deur ’n bekende meettegniek wat gebruik word in die ruimtelike gebied, tigografie, aan te pas vir gebruik in die tyd gebied genaamd tyd gebied tigografie. Die tegniek vereis die meting van ’n reeks intensiteit spektra by verskillende tyd intervalle van ’n onbekende ‘tyd voorwerp’ en ’n bekende monster puls. Ons wys vir die eerste keer deur meting en numeriese berekening dat hierdie tegniek toegepas kan word met uitstekende resultate, om die amplitude en fase van ’n ‘tyd voorwerp’ te meet. Hierdie tegniek het verskeie voordele, die iteratiewe proses is vinnig, die resolusie van die tegniek word bepaal deur die spektrale bandwydte gemeet en die fase van die ‘tyd voorwerp’ word met die korrekte teken gerekonstrueer. Ons het hierdie tegniek uitgebrei na puls karakterisering waar die monster pulse afgelei word, deur ’n bekende filter te gebruik, van die onbekende ‘tyd voorwerp’ nl. die inset puls. Ons het die iteratiewe algoritme wat die ‘tyd voorwerp’ rekonstrueer aangepas om ook die monster puls te vind en ons wys dat ons hierdie metode suksesvol kan gebruik om laser pulse te karakteriseer
Skjeie, Hans Christian Bakken. "Terahertz Time-Domain Spectroscopy." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19214.
Full textLam, Vai Iam. "Time domain approach in time series analysis." Thesis, University of Macau, 2000. http://umaclib3.umac.mo/record=b1446633.
Full textSankaran, Krishnaswamy. "Accurate domain truncation techniques for time-domain conformal methods /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17447.
Full textLopez-Castellanos, Victor. "Ultrawideband Time Domain Radar for Time Reversal Applications." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301040987.
Full textHussain, Ali. "Ultrabroadband time domain terahertz spectroscopy." Thesis, University of Bath, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431734.
Full textPredoehl, Andrew M. "Time domain antenna pattern measurements." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11072008-063651/.
Full textRoberts, Adam. "Time Domain Spectroscopy of Graphene." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/228120.
Full textLi, Jian. "Theory and application methods of time domain reflectometry/time domain transmission computed tomography (TDR/TDT CT)." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, p, 2007. http://proquest.umi.com/pqdweb?did=1397912601&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textTorcedo, Jojit Camama. "Time-domain Terahertz Spectroscopy of water." Diss., [Riverside, Calif.] : University of California, Riverside, 2010. http://proquest.umi.com/pqdweb?index=0&did=2019861181&SrchMode=2&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1274284155&clientId=48051.
Full textIncludes abstract. Title from first page of PDF file (viewed May 18, 2010). Includes bibliographical references. Issued in print and online. Available via ProQuest Digital Dissertations.
Kalyoncu, Ozden. "Noise Reduction In Time-frequency Domain." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608768/index.pdf.
Full textCondori-Arapa, Cristina. "Antenna elements matching : time-domain analysis." Thesis, Högskolan i Gävle, Akademin för teknik och miljö, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-7783.
Full textSoong, Chi-Li. "Fast time-domain-based GPS acquisition." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178041237.
Full textReader, H. C. "Time domain techniques for antenna analysis." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355676.
Full textCamus, Enrique Castro. "Polarisation resolved terahertz time domain spectroscopy." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441048.
Full textFitzgerald, Colm J. "Time-domain simulations for floating structures." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/14475.
Full textEllison, John G. "A polarimetric optical time domain reflectometer." Thesis, University of Essex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285848.
Full textMatthysen, Nardus. "Time domain metrology for MeerKAT systems." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95963.
Full textENGLISH ABSTRACT: This work in this study covers a powerful technique to derive propagation and scattering information in an expedient fashion. Expedient because time-domain (TD) data gathers a broad spectrum in a single transmitted pulse. TD has been criticised because of a lack of dynamic range, which has now been overcome by the direct sampling system, RATTY and RTA. This study focuses on the investigation of a TD metrology system, to assist with the characterisation of MeerKAT systems. The elementary components of the system include a fast-rising impulse generator that was coupled with an impulse radiating antenna (IRA). The system was calibrated and tested before practical measurements and preliminary testing in the Karoo were done. For TDmetrology a larger bandwidth accelerates measurements without the loss of accuracy. The pulse generator’s (PG’s) fundamental components are an avalanche transistor and a step recovery diode (SRD), to sharpen the leading edge of the pulse. Improving the rise-time of a pulse increases its bandwidth in the spectrum. The external circuitry around these components is pivotal and it determines the shape, amplitude and rise-time of the pulse. In the course of the investigation, the general circuitry around the PG was improved to obtain the best possible pulse for measurements inside a reverberation chamber (RC) and for measurements in the Karoo. In light of this, a second and third PG source were obtained. For measurements in the Karoo, a larger amplitude pulse was required to increase the spectral content and this is essential for propagation measurements over distance and the shielding effectiveness (SE) of structures. Stacking avalanche transistors allow larger amplitude pulses and it improves the dynamic range of the spectrum. A PG incorporating stacked avalanche transistors, was designed, built and measured to assist with RC and small-scale field measurements in the Karoo. The third PG was bought for the practical measurements in the Karoo. The PG produces kilovolt pulses with pico-second rise-times that extend the spectral range of the current PGs at our disposal. With these PGs, an antenna is required for the radiation of impulse-like transients. The IRA is a high-gain large-bandwidth antenna. The IRA consists of a parabolic reflector, conical-plate transmission lines that are terminated through resistors onto the dish, and a feeding balun. The IRA design was thoroughly discussed and a first model for metrology was designed, measured and optimised. The IRA was also simulated with computation software code, FEKO. Before deployment of theTDsystem, calibration and characterisation measurements are required. The measuring devices used within this study were sampling oscilloscopes and direct sampling systems. The limitations of each device were explored and are discussed. The final measurements that were conducted contribute to work related to the SKA. This incorporated antenna pattern calibration, propagation over distance and the SE of a berm built from Karoo soil. The system investigated the propagation attenuation over the Karoo soil and vegetation, with great promise. A broad spectrum was measured over a few kilometres and compared to free-space loss. The SE of the berm covered the same spectral bandwidth. In this measurement, scattering effects and knife-edge diffraction were observed.
AFRIKAANSE OPSOMMING: Die werk in hierdie studie dek ’n kragtige tegniek wat gebruik kan word om die voortplanting en die verstrooiingsinligting van elektromagnetiese golwe op ’n voordelige manier af te lei. Dit is voordelig, want tydgebieddata versamel ’n wye spektrum in ’n enkele oordraagbare puls. Tydgebied is in die verlede baie gekritiseer omdat dit ’n dinamiese reikwydte kortkom en dit is nou oorwin deur die direkte steekproefnemingstelsel, RATTY en RTA. Hierdie studie fokus op die ondersoek van ’n tydgebiedmetingssisteem en dit help met die karakterisering van MeerKAT sisteme. Die elementêre komponente van die sisteem bestaan uit ’n vinnig-stygende impulsgenerator wat gekoppel is aan ’n impulsuitstralende-antenna (IRA). Die sisteem is gekalibreer en getoets voordat praktiese metings en toetse in die Karoo uitgevoer kon word. Vir tydgebiedmetings versnel ’n groter bandwydte die metings sonder om die akkuraatheid daarvan te beïnvloed. Die pulsgenerator se fundamentele komponente is ’n stortvloedtransistor en ’n stap-herstel diode (SRD) wat die voorpunt van die puls verskerp. Die eskterne stroombaan rondom hierdie komponente is noodsaaklik en dit bepaal die vorm, amplitude en die stygtyd van die puls. Deur die loop van hierdie ondersoek is die algemene stroombaan rondom die puls verbeter, om die beste moontlike puls vir metings binne in die weerkaatsingskamer en vir metings in die Karoo, te verkry. Na aanleiding van dit is ’n tweede en derde pulsgenerator bron verkry. Vir die metings in die Karoo is ’n puls met ’n groter amplitude vereis om die spektrale inhoud te vermeerder. Dit is noodsaaklik vir elektromagnetiese golf voortplantingsmetings oor afstand asook die beskermings effektiwiteit (SE) van die strukture. Stapel-stortvloed transistors skep pulse met groter amplitudes en dit verbeter die dinamiese reikwydte van die spektrum. ’n Pulsgenerator wat gestapelde stortvloedtransistors insluit is ontwerp, gebou en gemeet om te help met metings in die weerkaatsingskamer en kleinskaal veldmetings in die Karoo. Die derde pulsgenerator is gekoop vir praktiese metings in die Karoo. Die pulsgenerator vervaardig kilovolt pulse met pikosekond stygtye, wat die reikwydte van die spektrum van ons huidige puls uitbrei. Hierdie pulsgenerators vereis ’n antenna vir die uistraling van impulsagtige seine. Die IRA is ’n hoë-wins, groot-bandwydte antenna. Die IRA bestaan uit ’n paraboliese weerkaatser, konieseplaat transmissielyne wat deur weerstande op die skottel getermineer word, asook ’n voedings "balun". Die IRA ontwerp is deeglik bespreek en ’n model is ontwerp, gemeet en verbeter. Die IRA is ook gesimuleer met behulp van ’n rekenaarsagtewareprogram, FEKO. Voordat die tydgebiedsisteem benut kan word, moet dit gekalibreer word en karakteriseringsmetings moet ook daarmee uitgevoer word. Die meetinstrumente wat in hierdie studie gebruik is, is steekproefneming-ossilloskope en direkte steekproefneming-sisteme. Die tekortkominge van elke instrument is ondersoek en bespreek. Die finale meting wat uitgevoer is, dra by tot die werk wat geassosieer word met die SKA. Dit behels antennapatroonkalibrasie, voortplanting van elektromagnetiese golwe oor afstand en die SE van ’n "berm"wat gebou is uit Karoo-grond. Hierdie sisteem is gebruik om die voortplantings-verswakking oor die Karoo-grond en plantegroei te ondersoek en dit lyk baie belowend. ’nWye spektrumis oor ’n paar kilometer gemeet en dit is met wrywinglose ruimte vergelyk. Die SE van die "berm"het dieselfde spektrale bandwydte gedek. In hierdie meting is verstrooiingseffekte en mespunt-diffraksie waargeneem.
Deane, Anne Margaret. "Time domain work on brass instruments." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/847357/.
Full textCzech, Daniel Josef. "Time domain classification of transient RFI." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30071.
Full textSu, Wansheng. "Calibration of time domain network analyzers." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09232008-144723/.
Full textMeier, Mark Albert. "The time domain triple probe method /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Full textCharlamov, Jevgenij. "Time domain optical reflectometer systems investigation." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2013~D_20140227_140438-77567.
Full textDisertacijoje nagrinėjamos laiko srities optinės reflektometrinės (OTDR) sistemos. Pagrindinis tyrimo objektas yra OTDR įėjimo pakopa – optinis imtuvas (OI). Disertacijos tikslas – sukurti OI projektavimo metodiką, lei-džiančią pasiekti optimalų dinaminį diapazoną, suprojektuoti ir ištirti integ-rinį diferencinį pereinamos varžos stiprintuvą (PVS) su kintamu stiprinimo koeficientu. Darbe sprendžiami šie uždaviniai: atliekama OTDR ir jų pagrindinių charakteristikų analizė ir formuluojamos tobulinimo kryptys; analizuojami pagrindiniai optinio imtuvo triukšmų šaltiniai, jų mažinimo galimybės ir su-daromas apibendrintas optinio imtuvo triukšmų modelis; sukuriama OI pro-jektavimo metodika, leidžianti apskaičiuoti griūtinio fotodiodo dauginimo faktorių, pereinamosios varžos stiprintuvo grįžtamojo ryšio varžą ir įėjimo tranzistoriaus fizinius matmenis, kuriems esant gaunamas optimalus dina-minis diapazonas; projektuojamas optinio imtuvo maketas iš diskrečiųjų elementų ir tiriami jo parametrai; atliekamas integrinio PVS projektavimas ir modeliavimas, taikant 0,35 µm KMOP technologiją bei optinio imtuvo pa-rametrų skaičiavimas 0,1–100 MHz dažnių juostų diapazone. Disertaciją sudaro įvadas ir keturi skyriai. Pabaigoje pateikiami naudo-tos literatūros ir autoriaus publikacijų disertacijos tema sąrašai ir 1 priedas. Įvadiniame skyriuje aptariama: tiriamoji problema, darbo aktualumas, aprašomas tyrimų objektas, suformuluotas darbo tikslas bei uždaviniai, ap-rašoma tyrimų metodika... [toliau žr. visą tekstą]
Cluff, Julian. "Time domain THz spectroscopy of semiconductors." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311454.
Full textGraber, Benjamin. "HIGH POWER TIME DOMAIN TERAHERTZ SPECTROSCOPY." Diss., Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/301211.
Full textPh.D.
Terahertz (THz) has become a strong area for scientific research and commercial application in recent years. This research group has redesigned and optimized a THz photoconductive antenna, which currently operates with approximately 10x the power of a commercial antenna. It has been determined by this research that the THz signal emitted from a photoconductive antenna consists of coherent and incoherent signals. In addition to the improvement of the THz photoconductive antenna, I have optimized an electro optic THz detection system by characterizing the field dependency of an electro optic crystal, which enabled me to estimate the THz electric field strength. The high power THz source and optimized detection system were combined into a high power, high resolution time domain THz spectrometer. This spectrometer was used to conduct original measurements of the THz spectrum of water vapor, ionized air, and various chemical vapor including explosives. Most of these measurements were only possible with our improved THz spectrometer. In order to understand ionized air, an additional study was carried out to explore the ionization of several gases (e.g. N2, O2, Ar, CO2, and water vapor) which were ionized by radioactive isotopes. This unique study found that in addition to dose rate, the gamma energy of the radioactive isotopes and the sequential ionization levels of gases affect the equilibrium ion densities of these gases. This effect was especially pronounced for argon gas. The study of ion dynamics in gases has lead to the development of a prototype for stand-off detection and identification of radioactive isotopes. This prototype, despite being simple in design, can detect isotopes faster and more cheaply than a conventional gamma ray spectrometer. Throughout this thesis research I have successfully developed a high power, high resolution terahertz spectrometer and demonstrated that with the spectrometer I could identify characteristic resonances of water vapor, some chemicals including explosives, and even ionized air produced by nuclear isotopes. From the characteristic resonance frequencies one can understand the underlying physics or chemistry of molecules or atoms.
Temple University--Theses
Khoshnavaz, Mohammad Javad. "Coherency based time-domain imaging algorithms." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/54048.
Full textAlsanabani, Mohamed Moslih. "Soil water determination by time domain reflectometry: Sampling domain and geometry." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185550.
Full textZhou, Tingdong. "Electromagnetic system frequency-domain reduced-order modeling and time-domain simulation." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/279965.
Full textLuo, Linqing. "Time-frequency localisation of distributed Brillouin Optical Time Domain Reflectometry." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274568.
Full textEid, Rudy. "Time domain model reduction by moment matching /." München : Verl. Dr. Hut, 2009. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017609232&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textEng, Ju-Ling. "Higher order finite-difference time-domain method." Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1165607826.
Full textMui, Chi Seong. "Frequency domain approach to time series analysis." Thesis, University of Macau, 2000. http://umaclib3.umac.mo/record=b1446676.
Full textKoseoglu, Devrim. "Material Characterization With Terahertz Time-domain Spectroscopy." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611648/index.pdf.
Full text110>
crystals of various thicknesses to test the applicability of this algorithm. We have shown that the algorithm developed provides a quick way of eliminating the &ldquo
etalon&rdquo
reflections from the data. In addition, it is also shown that these &ldquo
etalon&rdquo
effects can be used for the frequency calibration of terahertz time-domain spectrometers.
Saunders, Charles T. W. "Optical fibre sensing by time domain reflectometry." Thesis, University of Manchester, 2006. https://www.research.manchester.ac.uk/portal/en/theses/distributed-optical-fibre-sensing(f1857f29-5af2-4e94-97dd-164f3d67f29b).html.
Full textDounavis, Anestis. "Time domain macromodels for high-speed interconnects." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ48469.pdf.
Full textAndersson, Ulf. "Time-Domain Methods for the Maxwell Equations." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3094.
Full textGorti, Bhaskar M. "Techniques for discrete, time domain system identification." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11242009-020121/.
Full textLall, Sanjay. "Robust control synthesis in the time domain." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364353.
Full textMavrikis, Paul. "Trajectory-specific model reduction in time domain." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265692.
Full textTych, Katarzyna Maria. "Terahertz time-domain spectroscopy of biological macromolecules." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540584.
Full textGiakas, Giannis K. "Time and frequency domain applications in biomechanics." Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389498.
Full textVine, Daniel Samuel Gordon. "Time-domain concatenative text-to-speech synthesis." Thesis, Bournemouth University, 1998. http://eprints.bournemouth.ac.uk/351/.
Full textClouston, Eric Nicol. "Microwave antenna measurements in the time domain." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304837.
Full textBingham, Harry Bradford. "Simulating ship motions in the time domain." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12320.
Full textBrezas, Panagiotis Panos. "Time-domain optimal control for vehicle suspensions." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607986.
Full textBozhinova, Inna. "TOYS : time-domain observations of young stars." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12014.
Full textRatcliffe, Colin Paul. "Dynamic structural modelling for time domain analysis." Thesis, University of Southampton, 1985. https://eprints.soton.ac.uk/52303/.
Full textOrcutt, Edward Kerry 1964. "Correlation filters for time domain signal processing." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277215.
Full textPapagni, Francesca <1993>. "Frequency domain analysis of stationary time series." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9850/1/Papagni_Francesca_tesi.pdf.
Full textElayouty, Amira Sherif Mohamed. "Time and frequency domain statistical methods for high-frequency time series." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8061/.
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