Dissertations / Theses on the topic 'Laser line measurement'

Thesis (M.S.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed August 14, 2009) Includes bibliographical references (p. 16-17).

Dans cette thèse, nous proposons une nouvelle méthode pour mesurer la taille et la forme de nanoparticules en utilisant l'holographie numérique dans l’axe en association un processus photo-thermique d’échauffement induit par laser. Une suspension de nanoparticules en très faible concentration et en milieu dilué dans une goutte d’eau, est chauffée par un laser impulsionnel. Une bulle de vapeur d’eau, stable, entourant la nanoparticule secondaire à l’échauffement est créée. La transposition de taille de l’échelle nanométrique à l’échelle micrométrique est alors obtenue. Ce processus photo-thermique est utilisé pour relier la taille de la bulle à la taille de la nanoparticule. On obtient les relations fonctionnelles entre le rapport d'aspect et le volume de la bulle et ceux de la nanoparticule. Ces fonctions dépendent des caractéristiques de l'impulsion laser, de la température initiale de la nanoparticule et l’indice optique de l'eau et sont également spécifiques à la matière et à la forme de la nanoparticule. Une nanoparticule sphérique de TiO2 est utilisée dans cette démonstration. Le diamètre mesuré expérimentalement est en bon accord avec le diamètre moyen de l'échantillon. Cela signifie que la mesure indirecte utilisant la bulle de vapeur d’eau obtenue par cavitation autour de la nanoparticule peut être considéré comme efficace pour obtenir la taille d'une nanoparticule<br>In this thesis we study and develop a new methodology to measure the size and shape of individual nanoparticles by using digital in-line holography (DIH) microscopy in association with a photothermal process. Due to the limited resolution of the direct DIH technique at the nanoscale, an indirect measurement is treated. Instead of recording the hologram of a nanoparticle directly, the nanoparticle suspension is suddenly heated by a powerful pulse laser. Then a vapor bubble cavitation surrounding the nanoparticle is formed in order to increase the object size from the DIH point of view. The photothermal process is used to link the size of the bubble to the size of the nanoparticle. We obtain the functional relations between the aspect ratio and volume of the bubble and those of the nanoparticle from this process. These functions are dependent on the characteristics of the laser pulse, the initial temperature of the nanoparticle and the water medium, and are also specific to the material and shape of the nanoparticle. A spherical nanoparticle of TiO2 is used in this demonstration. The measured diameter is in good agreement with the average diameter of the sample. This means that the indirect measurement employing the cavitation vapor bubble around the nanoparticle can be considered as efficient to obtain the size of a nanoparticle. This technique has the ability to take into account the shape (ellipticity) of the bubble

This Thesis project is a part of the all-round automation of production of concentrating solar PV/T systems Absolicon X10. ABSOLICON Solar Concentrator AB has been invented and started production of the prospective solar concentrated system Absolicon X10. The aims of this Thesis project are designing, assembling, calibrating and putting in operation the automatic measurement system intended to evaluate the shape of concentrating parabolic reflectors.On the basis of the requirements of the company administration and needs of real production process the operation conditions for the Laser testing rig were formulated. The basic concept to use laser radiation was defined.At the first step, the complex design of the whole system was made and division on the parts was defined. After the preliminary conducted simulations the function and operation conditions of the all parts were formulated.At the next steps, the detailed design of all the parts was conducted. Most components were ordered from respective companies. Some of the mechanical components were made in the workshop of the company. All parts of the Laser-testing rig were assembled and tested. Software part, which controls the Laser-testing rig work, was created on the LabVIEW basis. To tune and test software part the special simulator was designed and assembled.When all parts were assembled in the complete system, the Laser-testing rig was tested, calibrated and tuned.In the workshop of Absolicon AB, the trial measurements were conducted and Laser-testing rig was installed in the production line at the plant in Soleftea.

Spatially-resolved measurements of flame temperature have been demonstrated with diode lasers for the first time. The technique is based on the use of blue diode lasers to perform laser-induced fluorescence on indium atoms seeded to the flame. Temperature measurements have been carried out in laminar flames both by the two-line atomic fluorescence technique, and also by a novel line-shape thermometry method that requires the use of only a single diode laser. The first part of this work involved the development of blue extended cavity diode lasers with favourable tuning properties. Two custom-designed extended cavity diode lasers (ECDL) have been built, emitting at wavelengths of around 410 nm and 451 nm respectively. These devices are capable of mode-hop free tuning over ranges greater than 90 GHz. The performance of these devices exceeds that of commercially available systems and a patent application has been filed. High resolution fluorescence spectroscopy has been performed on both the 52P1/2→62S1/2 and 52P3/2→62S1/2 transitions of indium atoms seeded at trace quantities into atmospheric pressure flames. In both cases, the spectra obtained show excellent agreement with a theoretical fit based on the individual hyperfine components of the transition. The two ECDLs have been used to build a sensor for the measurement of temperature in combustion systems. It is much simpler, more compact, less expensive, and more versatile than any previously existing device. The two lasers were used sequentially to probe indium atoms seeded to the flame. The ratio of the resulting fluorescence signals is related to the relative populations in the two sub-levels of the spin-orbit split ground state of indium, and thus to the temperature. Temperature measurements have been successfully performed in a laminar flame and the data thus obtained do not need to be corrected by any ‘calibration constant’. This novel thermometry technique offers a robust alternative to traditional methods involving bulky high power lasers. A further development has been made by demonstrating a fluorescence line-shape thermometry technique requiring only a single diode laser excitation source. Progress has been made towards the goal of rapid temperature measurements appropriate to the study of turbulent flames. This involved the development of a simple technique for actively locking the wavelength of the blue diode laser to a resonance line of the tellurium molecule. A high-speed thermometry system would work by rapidly switching between the two locked laser beams using an optical modulator.

Abstract The aim of this work was to improve the performance and usability of a digital time-to-digital converter (TDC) in CMOS technology. The characteristics of the TDC were improved especially for the needs of pulsed laser time-of-flight (TOF) distance measurement, where picosecond-level precision with a long µs-level measurement range is needed in order to approach mm-level measurement accuracy. Stability in the face of process, voltage and temperature variations, multiple measurement channels, alternative measurement modes, a high integration level, standard interfaces and simple usage were the main features for development. The measurement architecture is based on counter and timing signal interpolation on two levels. The counter counts the full reference clock cycles between the timing signals, while a new recycling delay line developed in this thesis interpolates within the reference clock cycle. This technique utilizes a short delay line several times per reference clock cycle, which minimizes the interpolation nonlinearity. The same structure also makes the use of a low, MHz-level reference frequency possible, and thus only a crystal is needed as an external oscillator component. The parallel load capacitor-scaled delay line structure acts as the second, sub-gate-delay interpolation level. The INL does not accumulate in elements connected in parallel, and the load capacitance differences enable high, ps-level resolution to be achieved. Four TDC circuits in 0.35 µm CMOS technology were designed and tested in the course of this work, of which the latest, a 7-channel TDC, is able to measure the time intervals between the start pulse and three separate stop pulses in one measurement and to resolve the pulse widths or rise times at the same time. In laser TOF distance measurement this functionality can be used when several echoes arrive at the receiver, and also to compensate for the detection threshold problem known as timing walk error. The TDC achieves 8.9&#160;ps interpolation resolution within the cycle time of a 20&#160;MHz reference clock using only 8 delay elements on the first interpolation level and 14 delay elements on the second. A measurement precision better than 9&#160;ps was achieved without using result post-processing or look-up tables. This work shows that versatile, high performance TDCs can be created in standard CMOS technology<br>Tiivistelmä Väitöskirjatyön tavoitteena oli parantaa CMOS-aika-digitaalimuuntimien suorituskykyä ja käytettävyyttä. Muuntimen ominaisuuksia kehitettiin erityisesti laseretäisyysmittauksen tarpeita ajatellen, missä millimetritason mittaustarkkuus laajalla mittausaluella edellyttää aika-digitaalimuuntimelta pikosekuntitason tarkkuutta mikrosekuntien mittausalueella. Stabiilius prosessiparametri-, jännite- ja lämpötilavaihteluita vastaan, useat mittauskanavat, useat mittausmoodit, korkea integraatioaste, standardoidut liitäntäväylät ja helppo käytettävyys olivat erityisesti kehityksen kohteina. Suunniteltu mittausarkkitehtuuri koostuu laskurista ja kaksitasoisesta ajoitussignaali-interpolaattorista. Laskuri laskee kokonaiset referenssikellojaksot ajoitussignaalien välillä ja työssä kehitetty referenssiä kierrättävä viivelinjarakenne rekistereineen interpoloi ajoitussignaalien paikat referenssikellojaksojen sisältä. Referenssinkierrätystekniikka hyödyntää lyhyttä viivelinjaa useampaan kertaan kellojakson aikana, mikä minimoi epälineaarisuuden interpoloinnissa. Sama rakenne mahdollistaa myös MHz-tason referenssitaajuuden, jolloin matalataajuista kidettä voidaan käyttää referenssilähteenä. Toinen interpolointitaso koostuu rinnakkaisista kapasitanssiskaalatuista viive-elementeistä, mitkä mahdollistavat alle porttiviiveen mittausresoluution. Rinnakkaisessa rakenteessa elementtien epälineaarisuudet eivät summaudu, mikä mahdollistaa pikosekuntitason mittaustarkkuuden. Väitöskirjatyössä suunniteltiin ja toteutettiin neljä aikavälinmittauspiiriä käyttäen 0,35&#160;µm CMOS-teknologiaa, joista viimeisin, 7-kanavainen muunnin kykenee mittaamaan aikavälin useampaan pulssiin yhdellä kertaa sekä voi selvittää samalla pulssien leveydet tai nousuajat. Laseretäisyysmittauksessa monikanavaisuutta voidaan käyttää kun useita kaikuja lähetetystä pulssista saapuu vastaanottimeen sekä kompensoimaan mittauksessa esiintyviä muita virhelähteitä. Käytettäessä 20&#160;MHz:n kidettä referenssilähteenä muunnin saavuttaa alle 9&#160;ps:n interpolointiresoluution ja tarkkuuden ilman epälineaarisuudenkorjaustaulukoita. Työ osoittaa, että edullisella CMOS-teknologialla voidaan toteuttaa monipuolinen ja erittäin suorituskykyinen aika-digitaalimuunnin

One 3D measurement method is laser scanning. By projecting and photographing a laser line, the centre line coordinates of the laser can be obtained with centre line detection methods and then be used to generate 3D model of the scanned object. This thesis compares three centre line detection algorithms with respect to their utility for the purpose of 3D reconstruction. The investigated algorithms were Steger’s method, Gaussian fitting and Centre of Mass. The algorithms were evaluated regarding noise sensitivity and their ability to detect jagged laser lines. It was concluded that Steger’s method was the most noise resistant, but less accurate than the others when the jagged line was at an acute angle. The performance of the Gaussian fitting and Centre of Mass algorithms was relatively equal for all investigated test cases.

This study has focused on development, optimisation and implementation of the 2-line Planar Laser Induced Fluorescence (2-line PLIF) technique for combustion measurements on a single cylinder optical Gasoline Direct Injection (GDI) engine with both Spark Ignition (SI) and Controlled Auto Ignition (CAI) combustion operations. The CAI combustion was achieved by employing Negative Valve Overlap (NVO). Two excitation wavelengths at 308 nm (directly from a XeCl laser) and 277 nm (via Raman shifting a KrF laser output at 248 nm) were exploited for the measurements. A calibration curve of fluorescence signal intensity ratio of the two laser beams as a function of temperature was obtained by conducting a series of static tests on a specially designed Constant Volume Chamber (CVC). The developed technique was validated by measurements of in-cylinder charge temperature during the compression stroke for both motoring and firing cycles and comparing the PLIF values with the temperature values calculated from in-cylinder pressure data assuming a polytropic compression. Following the validation measurements, the technique was applied to study of fuel spray characteristics and simultaneous measurements of in-cylinder charge temperature and mole fraction of Exhaust Gas Residuals (EGR). Further optimisation of the thermometry technique by enhancing the fluorescence Signal to Noise Ratio (SNR) and improving both the temporal and spatial resolutions as well as measurements precision provided the opportunity to apply the technique to other combustion measurements. The thesis presents the first application of the 2-line PLIF diagnostic in study of direct injection charge cooling effects and study of flame thermal stratification in IC engines.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.<br>Includes bibliographical references (leaves 156-158).<br>by Avinash Shreedhar Lele.<br>M.S.

This work deals primarily with measurements of molecular line's frequency shifts induced by pressure, laser power and applied frequency modulation. The subjects of the study were infrared transitions in acetylene (C2 H2) and ammonia (NH3) molecules, which are important from the point of view of telecommunications and metrology researchers. In addition, the measurements of saturated line power broadening were carried out for selected lines of 12C2H2 and 13C2H2 as well as for the recently discovered saturated absorption line in 14NH3. This study led to experimentally establishing the molecular dipole moments for a given transition even without proper ro-vibrational assignment.

In dieser Arbeit wurde eine einfache laserspektroskopische Messmethode für lokale elektrische Feldstärken im Hinblick auf ihre Messmöglichkeiten und -grenzen untersucht. Als empfindliche optische Feldsensoren dienen dabei Wasserstoffatome, für die die Stark-Aufspaltung der Spektrallinien im elektrischen Feld wohl bekannt und exakt berechenbar ist. Die experimentellen Untersuchungen wurden an einer Niederdruck-Gaszelle durchgeführt, in der ein elektrisch geheizter Wolframdraht für thermische Dissoziation von Wasserstoffmolekülen sorgte. Die Wasserstoffatome wurden durch zwei gegenläufige Laserstrahlen Doppler-frei angeregt. Die Durchstimmung der schmalbandigen Laserstrahlung über den Wellenlängenbereich der Zwei-Photonen-Resonanz lieferte direkt das vom elektrischen Feld hervorgerufene Stark-Spektrum des angeregten Zustands. Weil die Methode im Gegensatz zu ähnlichen, erheblich aufwendigeren Verfahren nur die niedrigsten Wasserstoff-Energieniveaus benutzt, die mit Zwei-Photonen-Anregung direkt aus dem Grundzustand erreichbar sind, kommt sie mit einem einzigen Laser aus. Für das erste angeregte Niveau mit n = 2 wird Strahlung bei 243 nm benötigt, das nächsthöhere Niveau mit n = 3 erfordert 205 nm. Für n = 2 wurden Untersuchungen an Wasserstoff und Deuterium durchgeführt und Stark-Spektren mittels optogalvanischer Detektion gemessen. Schwerpunkt der Arbeit waren aber die Messungen an Wasserstoff für n = 3, bei denen zusätzlich Balmer-alpha-Fluoreszenz im Sichtbaren zur Detektion eingesetzt werden konnte. Bei elektrischen Feldern bis 200 V/cm wurden Stark-Spektren für drei verschiedene Polarisationszustände der Laserstrahlung aufgenommen. Als Ergebnis konnte jeweils ein Paar isolierter Stark-Komponenten in den Spektren identifiziert werden, dessen gut messbarer Frequenzabstand durch Vergleich mit theoretischen Werten die Bestimmung der elektrischen Feldstärke ermöglicht.<br>A method for electric field measurements that observes the Stark spectra of the low excited levels n = 2 and n = 3 of atomic hydrogen has been explored in this work. As advantage these levels can be excited Doppler-free from the ground state by a single laser and the highly resolved Stark spectra are easy to understand and to be calculated. Good sensitivity of electric field measurements is achieved with specially designed solid state laser systems, which provide tuneable pulsed UV radiation with a high pulse peak-power and a narrow bandwidth needed for Doppler-free two-photon excitation. Using hydrogen and deuterium the Stark spectra of the n = 2 level are detected as optogalvanic signal. For three different cases of laser polarization the n = 3 spectra of hydrogen are measured simultaneously with optogalvanic and laser induced Balmer alpha fluorescence detection. Electric fields down to 200 V/cm can be determined from the Stark spectra of n = 2 level, while the spectra of n = 3 level enable measurements of electric fields as small as 50 V/cm in each of the three cases of laser polarization.

There is no established method of measuring load accurately in a threaded connection at working temperatures exceeding 500°C. At these conditions conventional methods can not be used due to the sensitivity of the instruments and it is suggested that a non contact method should be used. The laser strain gauge was developed by the Loughborough University Optical Research Group and it is a non contact way of measuring surface strain. With the help of finite element analysis (FEA) a special nut was developed that can be used to measure the load on the connection by relating the surface strain of the nut to the load. Experimental work later revealed that due to the threads sticking in the connection there is hysteresis present between the load and surface strain relationship. To eliminate the hysteresis a new part was added to the connection which could be used to relate the surface strain on it to the load without any hysteresis. This new part was a specially designed washer with three grooves to allow easy access for the user to measure the surface strain using the laser strain gauge. Part of the design specification was that the load has to be determined to an accuracy of 0.5%. Using sensitivity analysis the washer was analysed in terms of how manufacturing imperfections affect the accuracy of the load measuring device. The results revealed that to achieve the required 0.5% accuracy the washer would have to be manufactured to very tight tolerances. To achieve these tight tolerances the manufacturing process would not be cost effective so it was proposed that individual calibration is required for each load measuring washer. Tests showed that with sufficient calibration the specially designed washer and the laser strain gauge can be combined and used as an accurate non contact load measuring device. As it is a non contact method it can be used in extreme environments including high temperatures. This thesis describes how background research, finite element analysis and experimental testing were used to develop the load measuring washer. Also it is shown, how in-depth sensitivity analysis was used to determine the accuracy of the prototype and that how manufacturing imperfections influence the working life of a threaded connection.

El món de les comunicacions per la xarxa elèctrica (CXE) pot ser dividit en tres grans tipus: CXE en baix voltatge (CXE-BV), en mig voltatge (CXE-MV) i en alt voltatge (CXE-AV). En aquests últims anys, les CXE-BV han atret una gran expectació, ja que les seves capacitats han fet d'aquesta tecnologia una bona opció com alternativa pel bucle local d'accés i pel desplegament de xarxes d'àrea local, focalitzades aquestes últimes en l'entorn domèstic. A més, les CXE-BV inclouen un conjunt d'aplicacions de baixa velocitat orientades a l'operador, com la lectura automàtica de comptadors (LAC), distribució de càrrega, facturació dinàmica, etc. Per altra banda, les CXE-MV i CXE-AV, històricament lligades a tasques de telecontrol i teleprotecció, s'estan començant a considerar com un canal de comunicacions eficient i fiable. El desenvolupament de sistemes digitals i els esforços d'estandardització estan fent d'aquests canals un medi atractiu per a que els operadors elèctrics ofereixin serveis de comunicacions, ja que no necessiten invertir en infraestructura perquè la xarxa elèctrica ja està desplegada.<br/>En aquesta Tesi s'introduiran i es comentaran les particularitats de les tres xarxes elèctriques, després, es mostraran al lector les solucions tecnològiques existents pels canals de BV basats en la norma Europea CENELEC així com pels canals d'AV, mostrant que els sistemes actuals de LAC ofereixen una diversitat freqüencial molt baixa i que els mòdems CXE-AV estan ancorats en estendards antiquats.<br/>Aquest treball es mou per les tres topologies de la xarxa, particularment, en aplicacions orientades a la banda CENELEC, en mesura i modelat de canal, i en mesura i disseny del nivell físic per sistemes CXE-BV, CXE-MV i CXE-AV respectivament. Els sistemes actuals que exploten la banda CENELEC ofereixen mecanismes d'explotació de la diversitat freqüencial del canal molt limitats o nuls, donant lloc a una baixa robustesa en front a interferències i soroll de fons acolorit. Aquest treball proposa un esquema de modulació multiportadora que, mantenint una complexitat baixa, ofereix unes altes prestacions permetent un bon nivell d'explotació de la selectivitat freqüencial. Per al que a CXE-MV respecta, aquesta Tesi desenvolupa un model de canal determinístic-estadístic pels anells urbans de distribució de potència i, finalment, en sistemes CXE-AV, aquest treball proposa, basat en mesures de canal i proves de camp, un nivell físic de banda ampla capaç de incrementar la velocitat de comunicació mentre manté una baixa densitat espectral de potència limitant així la interferència a altres sistemes.<br/>PARAULES CLAU: Power line communications (PLC), low voltage (LV), medium voltage (MV), high voltage (HV), automatic meter reading (AMR), orthogonal frequency division multiplexing (OFDM), multicarrier spread spectrum (MC-SS), communication system design, channel measurements, channel modeling, scattering parameters.<br>El mundo de las comunicaciones por la red eléctrica (CRE) puede ser dividido en tres grandes tipos: CRE en bajo voltaje (CRE-BV), en medio voltaje (CRE-MV) y en alto voltaje (CRE-AV). En estos últimos años, las CRE-BV han atraído una gran expectación, ya que sus capacidades han hecho de esta tecnología una buena opción como alternativa para el bucle local de acceso y para el despliegue de redes de área local, focalizadas estas últimas en el entorno doméstico. Además, las CRE-BV incluyen un conjunto de aplicaciones de baja velocidad orientadas al operador como la lectura automática de contadores (LAC), distribución de carga, facturación dinámica, etc. Por otro lado, las CRE-MV y CRE-AV, históricamente ligadas a tareas de telecontrol y teleprotección, se están empezando a considerar como un canal de comunicaciones eficiente y fiable. El desarrollo de sistemas digitales y los esfuerzos de estandarización están haciendo de estos canales un medio atractivo para que los operadores eléctricos ofrezcan servicios de comunicaciones, ya que no necesitan invertir en infraestructura porque la red eléctrica ya está desplegada.<br/>En esta Tesis se introducirán y se comentarán las particularidades de las tres redes eléctricas, luego, se mostrarán al lector las soluciones tecnológicas existentes para los canales de BV basados en la norma Europea CENELEC así como para los canales de AV, mostrando que los sistemas actuales de LAC ofrecen una diversidad frecuencial muy baja y que los módems CRE-AV están anclados en estándares anticuados.<br/>Este trabajo se mueve por las tres topologías de red, particularmente, en aplicaciones orientadas a la banda CENELEC, en medida y modelado de canal, y en medida y diseño del nivel físico para sistemas CRE-BV, CRE-MV y CRE-AV respectivamente. Los sistemas actuales que explotan la banda CENELEC ofrecen mecanismos de explotación de la diversidad frecuencial del canal muy limitados o nulos, dando lugar a una escasa robustez frente a interferencias y ruido de fondo coloreado. Este trabajo propone un esquema de modulación multiportadora que, manteniendo una complejidad baja, ofrece unas altas prestaciones permitiendo un buen nivel de explotación de la selectividad frecuencial. Por lo que a CRE-MV respecta, esta Tesis desarrolla un modelo de canal determinístico-estadístico para los anillos urbanos de distribución de potencia y, finalmente, en sistemas de CRE-AV, este trabajo propone, basado en medidas de canal y pruebas de campo, un nivel físico de banda ancha capaz de incrementar la velocidad de comunicación mientras mantiene una baja densidad espectral de potencia limitando así la interferencia a otros sistemas.<br/>PALABRAS CLAVE: Power line communications (PLC), low voltage (LV), medium voltage (MV), high voltage (HV), automatic meter reading (AMR), orthogonal frequency division multiplexing (OFDM), multicarrier spread spectrum (MC-SS), communication system design, channel measurements, channel modeling, scattering parameters.<br>The world of Power line communications (PLC) can be divided into three main types: low voltage PLC (LV-PLC), medium voltage PLC (MV-PLC) and high voltage PLC (HV-PLC). These last years, LV-PLC has attracted a great expectation since its wideband capabilities has made this technology a suitable choice for last-mile access and in-home communications. Moreover, LV-PLC also includes a utility oriented low frequency and low speed applications, such as automatic meter reading (AMR), load distribution, dynamic billing and so on. On the other hand, MV-PLC and HV-PLC, historically oriented to teleprotection and telecontrol tasks, are being considered as a reliable communication channel. The development of digital equipment and the standardization efforts are making those channels an attractive medium for electrical utilities telecommunications services, since the network, as well as in LV-PLC, is already deployed. <br/>In this PhD dissertation, the three different PLC topologies are reviewed and the different communications techniques in such channels exposed. Then, a deep technological review of existing AMR solutions for the European CENELEC band, as well as HV-PLC systems is given, showing that existing AMR systems deliver low frequency diversity and HV-PLC systems are anchored in old fashioned standards.<br/>This work walks around the three topologies, specifically, CENELEC band utility oriented applications, channel measurement and modeling and channel measurement and physical layer design, regarding LV-PLC, MV-PLC and HV-PLC respectively. Existing CENELEC compliant systems deliver low or none frequency diversity mechanisms, yielding in a low robustness against colored noise and interference. This work propose a multicarrier based physical layer approach that, while keeping the complexity low, delivers high performance allowing a great level of frequency diversity. Focusing on MV-PLC, a hybrid deterministic-statistical channel model for urban underground rings is developed and, finally, in HV-PLC systems, this work proposes, based on measurements and field tests, a wideband physical layer in order to increase data rate while keeping low both the power spectral density and possible interference to other systems.<br/>KEYWORDS: Power line communications (PLC), low voltage (LV), medium voltage (MV), high voltage (HV), automatic meter reading (AMR), orthogonal frequency division multiplexing (OFDM), multicarrier spread spectrum (MC-SS), communication system design, channel measurements, channel modeling, scattering parameters.

Le travail présenté dans cette thèse porte sur la conception, la fabrication et la caractérisation de sources prévues pour fonctionner à la fois comme diode laser et comme oscillateur paramétrique optique. Ces lasers sont conçus pour émettre sur un mode d’ordre supérieur afin de permettre une conversion de fréquence paramétrique avec les modes fondamentaux du guide à la fréquence moitié. La diode laser et l’OPO partagent la même cavité optique ; pour assurer l’accord de phase et corriger les écarts à la structure nominale induits lors de l’élaboration par épitaxie, la largeur de ruban est utilisée comme paramètre de contrôle des indices efficaces. Les diodes proposées sont donc étroites (3-5 µm) et gravées profondément. En conséquence, il est potentiellement intéressant d’utiliser des boîtes quantiques pour limiter les recombinaisons non radiatives sur les flancs. Dans le cadre de ce travail, nous avons conçu des diodes basées sur ce principe pour les deux systèmes GaAs/AlGaAs et InGaAsP/InP, qui permettent respectivement d’obtenir potentiellement une émission OPO au voisinage de 2 µm ou de 3 µm. Dans le cas de l’InGaAsP/InP, nous avons étudié au préalable l’indice de réfraction des alliages InGaAsP dans une plage de longueur d’onde jusque-là non couverte par la littérature. Ces données ont été acquises via des mesures d’indice efficace (m-lines) de couches guidantes d’InGaAsP épitaxiées en accord de maille sur un substrat d’InP. Pour des structures laser-OPO optimisées, les simulations montrent que le seuil OPO devrait être obtenu pour une puissance de pompe intracavité de quelques centaines de mW, qu’il est réaliste d’atteindre pour des diodes laser à l’état de l’art. Nous avons étudié les propriétés électro-optiques de diodes lasers à puits quantiques GaAs/AlGaAs réalisées sur la base de nos dessins; l’observation de l’effet laser sur le mode TE2 valide le dessin vertical original de nos diodes lasers. En vue de la fabrication de laser-OPO à ruban étroit, nous avons développé des procédés de fabrication nouveaux sur la Plateforme Technologique Amont (CEA – Grenoble), notamment la gravure profonde (&gt;10 µm) par ICP-RIE. Enfin, nous avons proposé un concept alternatif de diode-OPO, comprenant des cavités laser et OPO distinctes couplées par un taper adiabatique<br>The work presented in this thesis deals with the design, fabrication and characterization of sources intended to function as both laser diodes and optical parametric oscillators. These lasers are designed to emit on a higher order mode to allow parametric frequency conversion with fundamental modes of the guide at half frequency. The laser diode and OPO share the same optical cavity; to ensure phase matching and correct nominal structure deviations induced during epitaxial processing, the ridge width is used as a control parameter of the effective indices. The proposed diodes are therefore narrow (3-5 μm) and etched deeply. Consequently, it is potentially interesting to use quantum dots to limit non-radiative recombination on the sidewalls. In the context of this work, we have designed diodes based on this principle for the two GaAs/AlGaAs and InGaAsP/InP systems, which respectively allow to potentially obtain an OPO emission in the vicinity of 2 μm or 3 μm. In the case of InGaAsP/InP, we previously studied the refractive index of InGaAsP alloys in a wavelength range not covered by literature to this day. This data was acquired via effective m-line index measurements of InGaAsP guiding layers epitaxially grown on and lattice-matched to an InP substrate. For optimized laser-OPO structures, simulations show that the OPO threshold should be obtained for an intracavity pump power of a few hundred mW, which is realistic to achieve for state-of-the-art laser diodes. We have studied the electro-optical properties of GaAs/AlGaAs quantum well laser diodes made on the basis of our designs; the observation of the laser effect on the TE2 mode validates the original vertical design of our laser diodes. For the manufacture of narrow-ridge lasers-OPOs, we have developed new manufacturing processes on the Plateforme Technologique Amont (Upstream Technology Platform, CEA - Grenoble), including deep etching (&gt; 10 μm) by ICP-RIE. Finally, we have proposed an alternative diode-OPO concept, comprising distinct laser and OPO cavities coupled by an adiabatic taper

Uvod: Lumbalni bolni sindrom (LBS) podrazumeva tegobe u vidu bolova, u lumbalnom ili lumbosakralnom segmentu kičmenog stuba, sa ili bez iradijacije u donje ekstremitete, uz poremećaj funkcije umbosakralnog dela kičmenog stuba, za&scaron;titnu mi&scaron;ićnu reakciju na bol (spazam) uz moguće znake senzitivnog poremećaja. Laser male snage (LMS) ima &scaron;iroku primenu u fizikalnoj medicini i rehabilitaciji zbog analgetskog, antiinflamatornog, antiedematoznog i biostimulativnog dejstva. Cilj rada: Glavni ciljevi su bili da se utvrdi da li fizikalna terapija primenom LMS utiče na smanjenje bola, povećanje pokretljivost lumbalne kičme, smanjenje spazma pravertebralne muskulature, kao i na smanjenje funkcionalne osnesposobljenosti u subakutnom LBS. Materijal i metode: Sprovedena je prospektivna studija na 123 pacijenata (50 mu&scaron;karaca i 73 žene), različitih profesija, izabranih metodom slučajnog izbora, prosečne životne dobi 32.59&plusmn;5.67 godina (ispitivana grupa 31.87&plusmn;5.84, kontrolna grupa 33.31&plusmn;5.45, raspon od 19-45). U studiju su uključeni ispitanici koji su prvi put doživeli lumbalni bolni sindrom koji su pregledani u Odeljenju za fizikalnu medicinu i rehabilitaciju Doma zdravlja Novi Sad. Ispitivanu grupu je činio 61 ispitanik koji su uključeni u fizikalni tretman, primenom laseroterapije i kineziterapije uz medikamentoznu terapiju. Kontrolnu grupu je činilo 62 ispitanika koji koji su uključeni u fizikalni tretman primenom kineziterapije uz medikamentoznu terapiju. Svim ispitanicima je uzeta anamneza, obavljen klinički pregled, izvr&scaron;ena samoprocena bola i popunjavali su upitnike. Navedeno ispitivanje je sprovedeno na početku tretmana, nakon 6 nedelje i nakon sprovedenog tretmana. Kori&scaron;ćeni su sledeći upitnici: vizuelna analogna skala (VAS), standardizovani upitnici za merenje funkcionalnog ishoda - The Oswestry Disability Index (ODI), The Rolland&amp;Morris Disability Questionnaire (RMDQ) i SF-36 upitnik. Rezultati: Rezultati ukazuju da se intenzitet bola meren VAS skalom u obe ispitivane grupe značajno smanjivao tokom svih posmatranih perioda ispitivanja, pri čemu dobijena razlika između dve grupe nije statistički značajna (p=0.904). Pokretljivost lumbalne kičme u obe ispitivane grupe tokom posmatranog perioda se značajno povećala tokom svih posmatranih perioda ispitivanja, pri čemu dobijena razlika između dve grupe nije statistički značajna (p=0.798). U obe ispitivane grupe spazam paravertebralne muskulature se značajno smanjivao tokom svih posmatranih perioda ispitivanja, dok dobijena razlika između grupa nije statistički značajna (p=0.453). Funkcionalna onesposobljenost pacijenata (procenjivana smanjenjem funkcionalne onesposobljenosti ODI i RMDQ) se značajno smanjivala u obe ispitivane grupe pacijenata tokom svih posmatranih perioda ispitivanja. Dobijena razlika u skorovima procenjivana RMDQ između ispitivanih grupa pacijenata nije statistički značajna (p=0.648), kao i putem ODI skora između ispitivanih grupa (p=0.311). Procena funkcionalne onesposobljenosti putem procene kvaliteta života (SF-36), ukazuje da se kvalitet života značajno povećavao u svim ispitivanim skorovima u obe ispitivane grupe tokom svih posmatranih perioda ispitivanja. Nema razlika u funkcionalnoj onesposobljenost (SF-36), odnosno nema razlike u kvalitetu života u skorovima fizičko funkcionisanje, ograničenje zbog emocionalnih problema, socijalno funkcionisanje, mentalno zdravlje, telesni bol, energija i vitalnost, sumarni skor fizičkog i sumarni skor mentalnog zdravlja između ispitivanih grupa. Dimenzije kvaliteta života u skorovima ograničenje zbog fizičkog zdravlja je značajno bolje u kontrolnoj grupi ispitanika (p=0.028). Dimenzija kvaliteta života u skoru op&scaron;te zdravlje je značajno bolje u ispitivanoj grupi pacijenata (p=0.041). Zaključci. Primenom LMS u subakutnom LBS do&scaron;lo je statistički značajnog smanjenja intenziteta bola, povećanja pokretljivosti lumbalne kičme, smanjenja spazma paravertebralne muskulature, kao i smanjenja funkcionalne onesposobljenosti. S obzirom da ne postoji koncenzus oko primene LMS, kao ni drugih metoda fizikalne terapije u subakutnom stadijumu LBS, navedeni rezultati bi mogli doprineti usvajanju kliničkih smernica, odnosno dijagnostičkih i terapijskih protokola za subakutni LBS.<br>Introduction: Low back pain syndrome (LBP) implies pain in the lumbar or lumbosacral segment of the spine, with or without irradiation into the lower extremities, with a disorder to the function of the lumbosacral part of the spine, a protective muscular reaction to pain (spasm) and possible signs of a sensory processing disorder. Low-Level Laser Therapy (LLLT) has broad application in physical medicine and rehabilitation due to analgesic, antiinflammatory, anti-edematous and biostimulative effects. Objective: The main objective of this study was to determine whether physical therapy with a LLLT has an effect on reducing pain, increasing mobility in the lumbar spine, reducing spasms of the paravertebral muscle, as well as in reducing functional incapacity in subacute LBP. Material and methods: A prospective study was conducted on 123 patients (50 men and 73 women), of different professions, chosen through random selection, with a mean age of 32.59 &plusmn; 5.67 years (examined group 31.87 &plusmn; 5.84, control group 33.31 &plusmn; 5.45, range 19-45). The study included respondents who had experienced lumbar pain syndrome for the first time and who had been examined in the Department of Physical Medicine and Rehabilitation of the Novi Sad Health Center. The examined group consisted of 61 respondents undergoing physical treatment with the application of LLLT and kinesiotherapy with medication therapy. The control group consisted of 62 respondents undergoing physical treatment with the application of kinesiotherapy with medication therapy. All patients were subject to an anamnesis, a clinical examination, a selfassessment of pain and were required to complete questionnaires. The above study was carried out at the beginning of treatment, after 6 weeks, and after treatment was completed. The following questionnaires were used: Visual Analogue Scale (VAS), standardized questionnaires for assessing functional outcomes &ndash; The Oswestry Disability Index (ODI), The Rolland &amp; Morris Disability Questionnaire (RMDQ) and the SF-36 questionnaire. Results: Results indicate that pain intensity assessed using the VAS scale was significantly decreased, in both examined groups, during all observed study periods, where the difference between the two groups was not statistically significant (p = 0.904). Mobility of the lumbar spine was significantly increased, in both examined groups, during all observed study periods, where the obtained difference between the two groups was not statistically significant (p = 0.798). In both examined groups, spasm of the paravertebral musculature significantly decreased during all observed study periods, while the difference between the groups was not statistically significant (p = 0.453). Functional disability of patients (assessed by a reduction of functional disabilities of ODI and RMDQ) significantly decreased in both examined groups of patients during all observed examination periods. The obtained difference in scores assessed via the RMDQ, between the studied patient groups, was not statistically significant (p = 0.648), as well as via the ODI score between the researched groups (p = 0.311). Assessment of functional disability through the assessment of quality of life (SF-36) indicates that the quality of life increased significantly, for all examined scores in both examined groups, during all observed testing periods. There is no difference in functional disability (SF-36), that is, there is no difference in quality of life in score physical functioning, restrictions due to emotional problems, social functioning, emotional wellbeing, bodily pain, energy/vitality, physical and mental health, between the examined groups. The dimensions of quality of life in score role limitations due to physical health problems are significantly better in the control group (p = 0.028). The quality of life dimension in the general health perceptions is significantly better in the examination group (p = 0.041). Conclusions: The application of LLLT in subacute LBP resulted in a statistically significant reduction in pain intensity, increased lumbar spine mobility, decreased spasms of paravertebral musculature, and decreased functional disability. Given that there is no consensus on the use of LLLT, nor any other methods of physical therapy, during the subacute LBP, these results could contribute to the adoption of clinical guidelines, that is, diagnostic and therapeutic protocols for subacute LBP.

Inpipes produktion av liners sker idag till stor del manuellt. I syfte att minska variansen på produktkvalitet, råvaror och öka processens hastighet undersöktes möjligheterna att elektroniskt mäta utbuktningarna som uppstod i processen. Därefter undersöktes processens egenskaper inför att använda mätvärdena i en passande reglerstruktur.  Efter en urvalsprocess i samråd med Inpipe och iLogik ansågs två av fem mätmetoder intressanta att gå vidare med i projektet. Utifrån dem togs beslut att undersöka hur beröringsfria givare med ultraljud och optisk teknik presterade på att mäta utbuktningarnas höjd. Mätningar utfördes både i testmiljö och i fabrik med laser, ultraljudsgivare och manuellt. Resultat visade att ultraljudsgivaren hade störst precision där optiska givaren tenderade att ge ett konstant mätfel. Processens utmanande egenskaper inför en reglering av bulorna fastslogs till att främst innefatta långsamma hartsflöden, varierande produktlängd och ytvariationer. Trots utmaningar som vågor på produktens yta samt ultraljudsgivarens mätavvikelse på lutande produkt resulterade arbetet i att ultraljudsgivaren bör fungera tillfredställande till att mäta utbuktningarnas höjdförändringar och implementeras i en reglering. Utifrån processens egenskaper och inom ramen för denna studie anses framkoppling som en lämpad reglerstruktur, däremot krävs det fortsatta undersökningar för att bekräfta eller dementera det.<br>Inpipes production of liners is today substantially done manually, in order to reduce the variance of product quality, raw material and production speed, the possibility to electronically measure the swell of the product in the process was examined. The property of the industrial process was also examined to find a suitable regulation structure.  A presentation of different methods of measurement was conducted, Inpipe chose two of them as specially interesting. It included measurement of ultrasound and optical laser sensors and decision to examine their precision on the liners swell was made. The measurement was done in controlled environment on a product dummy and in factory on the real liner. The ultrasound sensor proved to give the highest precision while the laser sensor indicated to measure a constant offset. The most challenging properties of the industrial process was determined to be slow resin flows, varying product length and surface variation on the product. Despite challenges as wave on the liners surface and the ultrasounds sensors inability to measure the liners slope, the project led to recommend the ultrasound sensor for measure the height of the liners swell and use the value in a regulation of the process. In theory feed forward regulation seems to suit the properties of the industrial process, but further work must be done to really confirm or deny that claim.

Um Flugzeugtriebwerke und stationäre Gasturbinen schadstoffärmer und leiser zu gestalten, werden effizientere Dämpfer zur Unterdrückung des in der Brennkammer entstehenden Schalls benötigt. Hierfür sollen durchströmte, perforierte Wandauskleidungen eingesetzt werden, die sogenannten Bias-Flow-Liner (BFL). Die Erhöhung der Dämpfungseffizienz von BFL erfordert jedoch ein tiefer gehendes Verständnis der aeroakustischen Dämpfungsmechanismen. Die Analyse der Mechanismen bedarf einer experimentellen Untersuchung des Vektorfeldes der Fluidgeschwindigkeit, die sowohl die Strömungsgeschwindigkeit als auch die Schallschnelle enthält. Zur gleichzeitigen Erfassung beider Größen wird eine berührungslose sowie örtlich und zeitlich hoch aufgelöste Messung der Geschwindigkeit von im Mittel 10 m/s bis 100 m/s bei einer Unsicherheit von maximal 10 mm/s für die Schallschnelleamplitude und einem Dynamikumfang von 1000 bis 10 000 benötigt. Für diese Messung sind optische Verfahren vielversprechend, genügten aber bisher nicht diesen Anforderungen. Deshalb wurden im ersten Schritt neuartige optische Geschwindigkeitsmessverfahren erstmals bezüglich der Eignung für aeroakustische Untersuchungen am BFL, speziell hinsichtlich der Unsicherheit und des Dynamikumfangs, charakterisiert: der Laser-Doppler-Geschwindigkeitsprofilsensor (LDV-PS), die akustische Particle Image Velocimetry (A-PIV) und die Doppler-Global-Velozimetrie mit Frequenzmodulation (FM-DGV). Aus dem Messunsicherheitsbudget geht für alle Verfahren die turbulente Strömungsfluktuation als dominierender Beitrag zur Unsicherheit für die gemessene Schnelleamplitude hervor, wobei die Unsicherheit durch eine Erhöhung der Messdauer gesenkt werden kann. Für eine Messdauer von 80 s beträgt die mittels FM-DGV erzielte Unsicherheit bei einer mittleren Strömungsgeschwindigkeit von 100 m/s beispielsweise 10 mm/s, woraus ein Dynamikumfang von 10 000 resultiert. Demnach erfüllen die neuartigen Verfahren die Voraussetzungen für die Anwendung am BFL, was im zweiten Schritt experimentell demonstriert wurde. Hierbei wurde zwecks Untersuchung kleiner Strukturen der LDV-PS mit einer feinen Ortsauflösung von minimal 10 µm genutzt. Ferner wurde die großflächige Erfassung mittels A-PIV zur Untersuchung der Wechselwirkung zwischen den Perforationslöchern eingesetzt und eine spektrale Untersuchung der mittels FM-DGV gemessenen Geschwindigkeit bei einer hohen Messrate von 100 kHz durchgeführt. Im Ergebnis wurden folgende Erkenntnisse zum Dämpfungsverhalten gewonnen: Am BFL tritt eine Interaktion von Strömung und Schall auf, die zu einer Oszillation der Geschwindigkeit mit hoher Amplitude bei der Schallanregungsfrequenz führt. Aus der erstmals durchgeführten Zerlegung der volumetrisch gemessenen Geschwindigkeit in Strömungsgeschwindigkeit und Schallschnelle resultiert, dass die akustisch induzierte oszillierende Geschwindigkeit vorwiegend dem Strömungsfeld zuzuordnen ist. Folglich wurde ein Energietransfer vom Schallfeld ins Strömungsfeld am BFL nachgewiesen, der wegen des sich typischerweise anschließenden Zerfalls von Strömungswirbeln und der finalen Umwandlung in Wärmeenergie zur Dämpfung beiträgt. Zudem wurde mittels spektraler Analyse der Geschwindigkeit ein breitbandiger Energiezuwachs bei tonaler Schallanregung festgestellt, welcher mit der Dämpfungseffizienz korreliert ist. Somit wird die These der primär von der akustisch induzierten Wirbelbildung herrührenden Dämpfung gestützt. Diese mit den neuartigen optischen Messverfahren gewonnenen Erkenntnisse tragen perspektivisch zur Optimierung von BFL hinsichtlich einer hohen Dämpfungseffizienz bei.

Fibromialgia é uma síndrome de etiologia desconhecida e caracterizada pela presença de dor difusa e crônica e pelo menos 11 dos 18 tender points específicos. É fundamental encontrar alternativas eficazes de tratamento que objetivem minimizar o impacto da fibromialgia (FM) sobre a qualidade de vida dos pacientes. O objetivo deste estudo foi avaliar a eficácia de um tratamento fisioterapêutico composto de terapia a laser nos tender points e exercícios de alongamento muscular sobre a qualidade de vida de pacientes com FM. Participaram do estudo 28 pacientes com FM que foram divididos em três grupos: GLA (n=10) que realizou 10 sessões de terapia a laser nos tender points e exercícios de alongamento; GA (n=10) que realizou 10 sessões de alongamento muscular e; GC (n=8) que realizou uma sessão educativa. Foram utilizadas as medidas da escala analógica visual da dor (VAS), dolorimetria dos tender points, Fibromyalgia Impact Questionnaire (FIQ) e SF-36. Os resultados mostraram que os grupos GLA e GA, quando comparadas as avaliações inicial e final, apresentaram diferença significante na VAS (p=0,006 e p=0,002; respectivamente); no limiar de dor dos tender points (p=0,001 e p=0,007; respectivamente); no FIQ (p=0,04 e p=0,006; respectivamente) e no SF-36 (p=0,001 e p=0,000; respectivamente). O grupo GC não apresentou diferença significante em nenhuma das medidas. Não houve diferença significante entre os grupos GLA e GA, mas houve diferença destes com o grupo GC nas medidas da VAS e do limiar de dor nos tender points. Neste estudo, conclui-se que os exercícios de alongamento são eficazes na melhora da dor, sensibilidade dolorosa dos tender points e qualidade de vida dos pacientes. Devem ser revistos alguns parâmetros da terapia a laser de baixa potência no tratamento desses pacientes, como o intervalo entre as sessões e o comprimento de onda do laser adotados. Sugere-se ainda que a abordagem educativa seja empregada como parte integrante do tratamento e que a relação fisioterapeuta-paciente deva ser valorizada, pois são aspectos importantes que podem contribuir para a melhora da qualidade de vida dos pacientes com FM.<br>Fibromyalgia is a syndrome of unknown etiology characterized by the presence of chronic and diffuse pain, and at least 11 of the 18 specific tender points. Its fundamental to find effective options of treatment that look for minimize the impact of fibromyalgia (FM) in the patients quality of life. The purpose of this study was to evaluate the efficacy of a physical therapy treatment compounded of laser therapy in the tender points and stretching exercises, in quality of life of patients with FM. Twenty-eight patients with FM participated of this study were divided in three groups: GLA (n=10) performed 10 sessions of laser therapy in the tender points and stretching exercises; GA (n=10) performed 10 sessions of stretching exercises and; GC (n=8) performed a single session of an educational approach. Measures of visual analogue scale of pain (VAS), dolorimetry of the tender points, Fibromyalgia Impact Questionnaire (FIQ) and SF-36 were assessed. The results showed, comparing initial and final assessments, the groups GLA and GA presented significant differences of VAS (p=0.006 and p=0.002; respectively); pain threshold of tender points (p=0.001 and p=0.007; respectively); FIQ (p=0.04 and p=0.006; respectively) and SF-36 (p=0.001 and p=0.000; respectively). There was no significant difference in any of the measures in the GC group. No significant groups GLA and GA differences were found, but compared with the controls (GC) the measures of VAS and pain threshold were significant different. In conclusion, in this study the stretching exercises were effective in the improvement to pain, tenderness threshold of the tender points and quality of life of patients with FM. Some parameters should be reviewed about low-power laser therapy in the treatment of patients with FM, as treatment intervals and laser wavelength. This study suggests that an educational approach could be employed as an integrant part of the treatment, and the relationship between physical therapist and patient plays an essential role in the treatment, since they are important aspects that contribute to the improvement in quality of life of patients with FM.

碩士<br>國立中興大學<br>機械工程學系所<br>104<br>To enhance the machine added value and as a basis for the development of the Automation Intelligence, development of On-machine Measurement technology is the trend in recent years. This method can not only boost productivity, but also avoid errors due to re-assembly of the workpiece. The laser probe has the advantages of fast, avert precision surface from damage compared to touch probe, and lower cost than 2D scanning system. Its disadvantage is that many factors like surface properties, slope and cutting fluid can worsen measurement resulrs. Therefore, this research first conducted experiment on vibration isolation table, exclude other factors caused precision lower, and combining the basic theory of optics to define the origin of measurement uncertainty, which limiting the use of laser tringulation. Next, we set up the laser probe on surface grinder and conduct pre-experiment to explore how the factors like vibration, cutting fluid, surface roughness affect the measurement uncertainty. And to propose solutions of these issues, such as using air blower gun can completely remove the cutting fluid shelter phenomenon for laser. Finally, we actually performed the on-machine verification of grinding removals and the radius of profile grinding. To overcome the uncertainity derived from surface roughness chenge, the easy moving average technique is able to increase the precision increase the precision up to 58.3% so that we can successfully detected the material removal to 1μm. In the part of profile grinding, using least squares fitting circle to find out the radius of the arc. And also have an advantage than the offline optical visoin. In consequence, we proof laser probe used in grinding online measurement is feasible and has possibility of intelligent automation development in the furture.

碩士<br>國立中央大學<br>光電科學研究所<br>98<br>This paper presents a non-invasive, non-contact system to measure Parkinson&apos;&apos;s disease patient dorsum manus vibration waveforms of artery via applying laser line method to detect dorsum manus vibration. The proposed Parkinson&apos;&apos;s disease measurement system chiefly consists of a laser diode and a low cost complementary metal-oxide semiconductor (CMOS) image sensor. Laser line and centroid method are combined with the Fast Fourier Transform (FFT) in this study. The shape and frequency of the dorsum manus vibration waveforms can be detected rapidly by using our Parkinson&apos;&apos;s disease measurement system. The relative variation of the Parkinson&apos;&apos;s disease patient dorsum manus vibration waveforms at laser line near wrist joint is used as testing points. An extensive series of experiments was conducted to evaluate the performance of the designed Parkinson&apos;&apos;s disease measurement system. Experimental design is divided into two groups for that control group normal human and Parkinson&apos;&apos;s patients. From the experimental results show that Parkinson&apos;&apos;s disease patients dorsum manus at rest, two patients left dorsum manus existence 4.1-4.3 Hertz of resting tremor frequency and the average frequency is 4.2 hertz. In addition the four patients with right dorsum manus 4.3-4.7 hertz of resting tremor frequency and the average frequency is 4.5 Hertz. Six patients dorsum manus postural action tremor frequency range from 0.29 to 1.52 hertz, and the average frequency is 0.905 Hertz. The control group normal human dorsum manus resting tremor frequency range from 0.09 to 0.53 hertz and the average frequency is 0.31 hertz, and postural action tremor frequency range from 0.71 to 0.82 hertz and the average frequency is 0.77 hertz. According to the results, six patients dorsum manus resting tremor frequency in descending order, 4.5 Hz (course of 5 years), 4.3 Hz (duration 2 years of disease), 4.1 Hz (duration 3 years of disease), 4.7 Hz (duration 7 years of disease), 4.5 Hz (duration 2 years of disease) and 4.3 Hz (duration 7 years of disease). If we rule out the sixth patient samples, dorsum manus tremor frequency is proportional to the duration of disease. On the other hand, we are laser line can detect two different situations simultaneously, for example the frequencies of postural action tremor left hand and the resting right hand by one laser line across both hand and get two frequencies dorsum manus simultaneously. By calculated their difference △f = f resting - f postural action. We get the preliminary data. △f = 3.495 Hertz which is almost ten times than the control group (△f = 0.46). This method can get rid of the environment and the psychological influence to the hand’s vibration. In our method, we can measure the micro vibration of human hand as high as 10μm resolution. This research demonstrates that applying a CMOS image sensor in designing a non-contact, portable, easy-to-use, low cost Parkinson&apos;&apos;s disease measurement system is feasible. Also, the designed Parkinson&apos;&apos;s disease measurement system is well suited for evaluating and pre-diagnosing the health of a human being.

One of the major limiting factors in fuel cell production is the time and effort that are required in the ink coating process of the Nafion film that is at the heart of what makes a fuel cell work. The principle reason that this issued has not been tackled by the industry at large is the inherent difficulties that arise. First and foremost is the rapid and extensive expansion of the material upon contact with the liquid ink causing the Nafion film to wrinkle while being processed. In the drive to help mitigate this issue it must be understood by what conditions and severity that wrinkling occurs. The method chosen to detect this was to develop a laser profile scanner to record and output the severity of any wrinkles present in the film. This thesis showcases and explains the laser scanning system designed specifically for this problem and material.<br>Mechanical Engineering<br>text

碩士<br>中華大學<br>電機工程學系碩士班<br>89<br>In this thesis, we use a cylinder lens to compress the laser beam into one-dimensional laser beam of line-light type, and by using a linear CCD to construct an optical type of simple object diameter measurement system. We use statistics and digital image processing to design the algorithm and software to precisely measure the object diameter. According to digital image processing, we have developed an edge detection algorithm to define the edge of object diameter and have used a standard of National Measurement Laboratory R.O.C (NML) to calibrate our algorithm and correct the systematic error. We estimated the correction factor, and used the method of statistics to add a algorithm to reduce the random error. Finally we calculated the total uncertainty for the measurement results. Experiments indicates that the optimal parameters of the measurement system are: (1) sampling time: 38 ms; (2) numbers of sampling : 81 times; (3) the input voltage of laser-beam module: 2.000 V. Experimental results show that the system uncertainty of the measurement system is 7 μm, which is small than one pixel size of the CCD. Using the correction factor to measure the diameters of 10 mm and 13 mm pin gauges, the uncertainties are 81 μm and 26 μm, respectively. According to the measurement results, we compared them with that of NML. The percentage errors are 0.82% and 0.25%, respectively. Experimental results also show that the simple-object diameter measurement system has the features of non-contact measurement, fast measurement ability and measurement with high accuracy. It is suitable to be applied to the production line to perform the automatic measurement of the size of objects diameter.

We give a brief introduction to atomic physics and the motivation behind our experiments in the first chapter. The electron’s electric dipole moment is an interesting quantity which is yet to be measured. In the 3rd Chapter, we use the technique of chopped non-linear magneto-optic rotation (NMOR) in a room temperature Cs vapor cell to measure the permanent electric dipole moment (EDM) in the atom. The cell has paraffin coating on the walls to increase the relaxation time. The signature of the EDM is a shift in the Larmor precession frequency correlated with the application of an E field. We analyze errors in the technique, and show that the main source of systematic error is the appearance of a longitudinal magnetic field when an electric field is applied. This error can be eliminated by doing measurements on the two ground hyperfine levels. Using an E field of 2.6 kV/cm, we place an upper limit on the electron EDM of 2.9 × 10−22 e-cm with 95% confidence. This limit can be increased by 7 orders-of-magnitude—and brought below the current best experimental value. We give future directions for how this may be achieved. In chapter 4, we examine the Hanle effect for linear and circularly polarized light for different ground states and we find opposite behavior in the transmission signal. In one case, it shifts from enhanced transmission to enhanced absorption and vice-versa in the other case. In Chapter 5, we study the transmission spectrum at different temperatures and device a way to find the number density. We then verify the Clausius-Clapeyron equation and also find the latent heat of vaporization of Cs. Finally, we wrap up with conclusions and future directions.

A.S. Lele, S.R. Kulkarni, A.S. Willsky.<br>Cover title.<br>Includes bibliographical references (p. 42-44).<br>Research supported by the Department of the Navy under an Air Force contract. F19628-90-C-0002 Research supported by the U.S. Army Research Office. DAAL03-86-K-0171 Research supported by the National Science Foundation. ECS-8700903

The on-line condition monitoring of turbomachinery blades is of utmost importance to ensure the long term health and availability of such machines and as such has been an area of study since the late 1960s. As a result a number of on-line blade vibration measurement techniques are available, each with its own associated advantages and shortcomings. In general, on-blade sensor measurement techniques suffer from sensor lifespan, whereas non-contact techniques usually have measurement bandwidth limitations. One non-contact measurement technique that yields improvements in the area of measurement bandwidth is laser Doppler vibrometry. This thesis presents results and findings from utilizing laser Doppler vibrometry in an Eulerian fashion (i.e. a fixed reference frame) to measure on-line blade vibrations in axial-flow turbomachinery. With this measurement approach, the laser beam is focussed at a fixed point in space and measurements are available for the periods during which each blade sweeps through the beam. The characteristics of the measurement technique are studied analytically with an Euler-Bernoulli cantilever beam and experimental verification is performed. An approach for the numerical simulation of the measurement technique is then presented. Associated with the presented measurement technique are the short periods during which each blade is exposed to the laser beam. This characteristic yields traditional frequency domain signal processing techniques unsuitable for providing useful blade health indicators. To obtain frequency domain information from such short signals, it is necessary to employ non-standard signal processing techniques such as non-harmonic Fourier analysis. Results from experimental testing on a single-blade test rotor at a single rotor speed are presented in the form of phase angle trends obtained with non-harmonic Fourier analysis. Considering the maximum of absolute unwrapped phase angle trends around various reference frequencies, good indicators of blade health deterioration were obtained. These indicators were verified numerically. To extend the application of this condition monitoring approach, measurements were repeated on a five-blade test rotor at four different rotor speeds. Various damage cases were considered as well as different ELDV measurement positions. Using statistical parameters of the abovementioned indicators as well as time domain parameters, it is shown that with this condition monitoring approach, blade damage can successfully be identified and quantified with the aid of artificial neural networks.<br>Thesis (PhD)--University of Pretoria, 2010.<br>Mechanical and Aeronautical Engineering<br>unrestricted

Thesis (Ph. D.)--Florida State University, 2008.<br>ETD title page, title: A precision measurement of 1s2s 1S0 - 1s2p - 3P1 interval in helium-like silicon. Advisor: Edmund Myers, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed July 24, 2008). Document formatted into pages; contains x, 87 pages. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1992.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 93-96).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1996.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 299-305).

Um Flugzeugtriebwerke und stationäre Gasturbinen schadstoffärmer und leiser zu gestalten, werden effizientere Dämpfer zur Unterdrückung des in der Brennkammer entstehenden Schalls benötigt. Hierfür sollen durchströmte, perforierte Wandauskleidungen eingesetzt werden, die sogenannten Bias-Flow-Liner (BFL). Die Erhöhung der Dämpfungseffizienz von BFL erfordert jedoch ein tiefer gehendes Verständnis der aeroakustischen Dämpfungsmechanismen. Die Analyse der Mechanismen bedarf einer experimentellen Untersuchung des Vektorfeldes der Fluidgeschwindigkeit, die sowohl die Strömungsgeschwindigkeit als auch die Schallschnelle enthält. Zur gleichzeitigen Erfassung beider Größen wird eine berührungslose sowie örtlich und zeitlich hoch aufgelöste Messung der Geschwindigkeit von im Mittel 10 m/s bis 100 m/s bei einer Unsicherheit von maximal 10 mm/s für die Schallschnelleamplitude und einem Dynamikumfang von 1000 bis 10 000 benötigt. Für diese Messung sind optische Verfahren vielversprechend, genügten aber bisher nicht diesen Anforderungen. Deshalb wurden im ersten Schritt neuartige optische Geschwindigkeitsmessverfahren erstmals bezüglich der Eignung für aeroakustische Untersuchungen am BFL, speziell hinsichtlich der Unsicherheit und des Dynamikumfangs, charakterisiert: der Laser-Doppler-Geschwindigkeitsprofilsensor (LDV-PS), die akustische Particle Image Velocimetry (A-PIV) und die Doppler-Global-Velozimetrie mit Frequenzmodulation (FM-DGV). Aus dem Messunsicherheitsbudget geht für alle Verfahren die turbulente Strömungsfluktuation als dominierender Beitrag zur Unsicherheit für die gemessene Schnelleamplitude hervor, wobei die Unsicherheit durch eine Erhöhung der Messdauer gesenkt werden kann. Für eine Messdauer von 80 s beträgt die mittels FM-DGV erzielte Unsicherheit bei einer mittleren Strömungsgeschwindigkeit von 100 m/s beispielsweise 10 mm/s, woraus ein Dynamikumfang von 10 000 resultiert. Demnach erfüllen die neuartigen Verfahren die Voraussetzungen für die Anwendung am BFL, was im zweiten Schritt experimentell demonstriert wurde. Hierbei wurde zwecks Untersuchung kleiner Strukturen der LDV-PS mit einer feinen Ortsauflösung von minimal 10 µm genutzt. Ferner wurde die großflächige Erfassung mittels A-PIV zur Untersuchung der Wechselwirkung zwischen den Perforationslöchern eingesetzt und eine spektrale Untersuchung der mittels FM-DGV gemessenen Geschwindigkeit bei einer hohen Messrate von 100 kHz durchgeführt. Im Ergebnis wurden folgende Erkenntnisse zum Dämpfungsverhalten gewonnen: Am BFL tritt eine Interaktion von Strömung und Schall auf, die zu einer Oszillation der Geschwindigkeit mit hoher Amplitude bei der Schallanregungsfrequenz führt. Aus der erstmals durchgeführten Zerlegung der volumetrisch gemessenen Geschwindigkeit in Strömungsgeschwindigkeit und Schallschnelle resultiert, dass die akustisch induzierte oszillierende Geschwindigkeit vorwiegend dem Strömungsfeld zuzuordnen ist. Folglich wurde ein Energietransfer vom Schallfeld ins Strömungsfeld am BFL nachgewiesen, der wegen des sich typischerweise anschließenden Zerfalls von Strömungswirbeln und der finalen Umwandlung in Wärmeenergie zur Dämpfung beiträgt. Zudem wurde mittels spektraler Analyse der Geschwindigkeit ein breitbandiger Energiezuwachs bei tonaler Schallanregung festgestellt, welcher mit der Dämpfungseffizienz korreliert ist. Somit wird die These der primär von der akustisch induzierten Wirbelbildung herrührenden Dämpfung gestützt. Diese mit den neuartigen optischen Messverfahren gewonnenen Erkenntnisse tragen perspektivisch zur Optimierung von BFL hinsichtlich einer hohen Dämpfungseffizienz bei.