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Dissertations / Theses on the topic 'Pulsed light modulation'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

González, Fernández Ernesto. "Low-power techniques for wireless gas sensing network applications: pulsed light excitation with data extraction strategies." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/672792.

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Aquesta tesi està enfocada en dues línies d'investigació. La primera aborda el desenvolupament d'una metodologia basada en llum polsada per modulació de sensors químic-resistius per a l'extracció d'informació del senyal transitòri, i la segona planteja la implementació d'una xarxa sense fils de sensors (WSN) basada en tecnologia LoRa per al monitoratge de la qualitat de l'aire (AQM) i la detecció d'esdeveniments de fuita de gasos. Aquest document està estructurat en quatre capítols organitzats de la següent manera: el Capítol 1 presenta l'estat de l'art, una introducció als mecanismes de

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2

Mbanda, Nsoungui Gaelle Carine. "Spectral and temporal modulation and characterization of femtosecond ultra-short laser pulses." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71883.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Ultra-short laser pulses are useful in materials processing like melting and cutting metals, and medical applications such as surgery and many other fields. In this study, we characterize and control the temporal shape of the ultra-short pulses generated from a Ti:Sapphire femtosecond laser. It operates in the near infra-red spectral region, with a centre wavelength of 800 nm. The 4f pulse shaper is the main setup used to modulate spectral shape and characterize the laser pulse. The shaper consists of two diffraction gratin

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Buhafa, Adel Mohamed. "Investigation and implementation of dicode pulse position modulation over indoor visible light communication system." Thesis, University of Huddersfield, 2015. http://eprints.hud.ac.uk/id/eprint/26166/.

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A visible light communication (VLC) system with green technology is available and enables users to use white LEDs for illumination as well as for high data rate transmission over wireless optical links. In addition, LEDs have advantages of low power consumption, high speed with power efficiency and low cost. Therefore, a great deal of research is considered for indoor VLC, as it offers huge bandwidth whilst using a significant modulation technique. This thesis is concerned with the investigation and implementation of the dicode pulse position modulation (DiPPM) scheme over a VLC link using whi

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4

Břoušek, Adam. "Řízení světelných zdrojů s LED." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-433273.

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This thesis deals with design of devices for control and regulation of LEDs. The document summarizes basic information about light, its origin and variety. This work discusses the effects of light on humans. There are also discussed the possibilities of lighting control with LEDs. The work includes a diagram that describes a device for controlling and controlling light for daylight and night light.

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5

Yeago, Taylor Craig. "A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51230.

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Power consumption of smart cameras varies significantly between sleep mode and active mode, and a smart camera operates in sleep mode for 80 — 90% of time for typical use. To prolong the battery life of smart cameras, it is essential to increase the power converter efficiency for light load, while being able to manage heavy load. The power stage of traditional buck converter is optimized for maximum load, at the cost of light-load efficiency. Wei proposed a multiphase buck converter incorporating the baby-buck concept and optimum number of phases (ONP) control. This thesis research investigate

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6

Rudhall, Andrew Peter. "Ultrashort laser pulse shaping for novel light fields and experimental biophysics." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3682.

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Broadband spectral content is required to support ultrashort pulses. However this broadband content is subject to dispersion and hence the pulse duration of corresponding ultrashort pulses may be stretched accordingly. I used a commercially-available adaptive ultrashort pulse shaper featuring multiphoton intrapulse interference phase scan technology to characterise and compensate for the dispersion of the optical system in situ and conducted experimental and theoretical studies in various inter-linked topics relating to the light-matter interaction. Firstly, I examined the role of broadband ul

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7

Alsolami, Ibrahim. "Visible light communications with single-photon avalanche diodes." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:744eeb47-8bb6-4776-8b8f-f7b6374d89bd.

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This thesis explores the use of single-photon avalanche diodes (SPADs) for visible light communications (VLC). The high sensitivity of SPADs can potentially enhance the performance of VLC receivers. However, a SPAD-based system has challenges that need to be addressed before it can be considered as a viable option for VLC. The first challenge is the susceptibility of SPAD-based receivers to variations in ambient light. The high sensitivity of SPADs is advantageous for signal detection, but also makes SPADs vulnerable to variations in ambient light. In this thesis, the performance of a SPAD-bas

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8

Cassidy, Brian Michael. "A Constant ON-Time 3-Level Buck Converter for Low Power Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73211.

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Smart cameras operate mostly in sleep mode, which is light load for power supplies. Typical buck converter applications have low efficiency under the light load condition, primarily from their power stage and control being optimized for heavy load. The battery life of a smart camera can be extended through improvement of the light load efficiency of the buck converter. This thesis research investigated the first stage converter of a car black box to provide power to a microprocessor, camera, and several other peripherals. The input voltage of the converter is 12 V, and the output voltage is 5

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9

Бондарець, Олександр Васильович, та Oleksandr Bondarets. "Кінетика післясвічення світлодіодів". Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2019. http://elartu.tntu.edu.ua/handle/lib/29572.

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The master's thesis describes the method of studying the kinetics of the afterglow of LEDs. The block diagram of the experimental setup is considered. The results of measurements of the afterglow of LEDs of different spectral composition and the LED matrix on their basis are presented. Based on the obtained results, the pulse repetition rate of 400 kHz with different degree of filling of the periodic pulse signal was selected. The dependence of the light flux at pulsed power on the PWM parameters of the supply voltage is investigated. The feasibility study of the transition from incandescent a

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10

Martins, Renato Juliano. "Estudo das propriedades ópticas não-lineares de semicondutores através da formatação de pulsos." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-24052017-142249/.

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Técnicas de formatação de pulsos permitem o controle das propriedades espectrais e temporais de um feixe laser criando novas possibilidades de estudo da interação luz-matéria. Neste trabalho estudamos as propriedades ópticas não-lineares via formatação de pulsos ultracurtos de três semicondutores: Óxido de Zinco, Silício e Nitreto de Gálio; em três abordagens diferentes. Discutimos também as consequências da distorção de fase em processos não lineares devido à natureza discreta do dispositivo modulador. Primeiramente, investigamos a otimização da emissão excitônica em um cristal de Óxido de Zi

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11

McCarthy, Tom. "Automatiserad gatubelysning baserad på omgivningens ljusstyrka : Hur ljussensorteknik kan minska energianvändningen för utomhusbelysning." Thesis, KTH, Hälsoinformatik och logistik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302562.

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Målet med arbetet var att undersöka hur enskilda gatlyktor skulle kunna utrustas med ljussensorteknik för att implementera automatisk dimring med syftet att sänka energianvändningen. Rapporter visar att väg- och gatubelysningen i Sverige stod för 626 GWh år 2016 samt att en stor del av ljuspunkterna fortfarande består av energikrävande högtrycksnatrium. Uppgifter visar även att energisnåla LED-armaturer blir alltmer förekommande som alternativ till högtryckslampor. Målet var att utveckla en prototyp för LED där funktionen bygger på att lysdioderna ska vara släckta när omgivningens ljusstyrka ä

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12

Bock, Martin. "Programmable ultrashort highly localized wave packets." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16842.

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Die vorliegende Arbeit beschäftigt sich mit dem Konzept der radial nicht-oszillierenden, zeitlich stabilen ultrakurzen Bessel ähnlichen Strahlen oder "Nadelstrahlen" ("needle beams"), die zu einer Klasse von optischen hochlokalisierten Wellenpaketen generalisiert werden. Hierbei wird die Theorie über das räumlich-zeitlichen Ausbreitungsverhaltens von nicht auseinanderdriftenden Nadelstrahlen mit Pulsdauern von kleiner als 10 fs näher diskutiert. Dies wird durch eine systematische Darstellung der Methoden zur Generierung und Detektierung von lokalisierten Wellen komplettiert, die ein optischen

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13

WU, YU-HUNG, and 吳宇弘. "Performance Evaluation of Joint Pulse Width Modulation and Pulse Position Modulation Visible Light Communications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/586pts.

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碩士<br>國立雲林科技大學<br>電子工程系<br>105<br>This research presents the simulation results of pulse width modulation and pulse position modulation (Joint PWM/PPM). During the PPM data transmissions, the PWM duty cycle changed from 40% to 80%, in the process of data transmission simultaneously to achieve dimming control of visible light communication (VLC). LED channel effect of VLC, resulting in the phenomenon of inter-symbol interference (ISI), so this thesis uses the post-equalization circuit to improve the LED bandwidth limit, and display PPM signal in different guard time (slot) bit error rate re

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14

Huang, Chao-Hsuan, and 黃朝玄. "Implementation of Double Pulse Width Modulation for Uniformity of LED Light Bars in LCD Back-Light." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/05478708358610022805.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>99<br>This thesis proposes a dimming approach with Double Pulse Width Modulation for equalizing the light output of the back light with light emitted diodes (LEDs) for large scale outdoor liquid crystal displays (LCDs). The approach compensates the difference among the LED light bars by adjusting the power outputs of converters according to the feedback of light strength from light sensors. With the proposed Double Pulse Width Modulation method, local brightness adjustment on the light bars can be made to provide a uniform light output and the dimming function for

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15

Vyhlídka, Štěpán. "Modulace časové disperze femtosekundových laserových pulsů." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-324237.

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In the presented thesis the topic of femtosecond pulse dispersion and methods of characterizing pulse profile are briefly introduced. Then, a functionality of a spatial light modulator is described. The spatial light modulator was used in an experimental scheme called the pulse shaper, which allowed independent amplitude and phase modulation of pulses. Duration and dispersion of pulses was measured by two methods called MIIPS and PICASO. MIIPS was also used for a reconstruction of a spectral phase of pulses. The autocorrelator was constructed on a design of the Mach-Zehnder interferometer. The

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16

Xue, Ren-Hao, and 薛人豪. "Light Emitting Diode (LED) Constant-Current Driver Design with Pulse-Width Modulation (PWM) Dimming Control." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/naax6e.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>102<br>In recent years, the traditional incandescent has life is short, low luminous efficiency, high replacement rate, does not meet the demands of environmental advocate, so being replaced by light emitting diode. Because LED has a long life, small size, light, fast response, environmental protection without the use of mercury and mercury materials, high luminous efficiency, but LED brightness depending on the forward current, therefore, how to supply constant current is becoming the most important topic of LED driving circuit. In this paper, the following three

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17

陳澤槿. "A Novel Pulse Width Modulation Scheme on Active Matrix Organic Light Emitting Diode Driving Circuit." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/44132769538070036144.

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碩士<br>國立交通大學<br>電機學院IC設計產業專班<br>95<br>Owing to increasing requirements of hand held 3C products, low power consumption, small volume, and light weight; OLED is drifting towards displacement of TN/STN LCD. Active matrix OLED driving circuits surpass passive matrix OLED ones not only in power consumption but also in efficiency. Thus, optimum designs of AMOLED driving circuits for achieving low power consumption, small volume, high uniformity, and long life time, are important topics for today’s display market. Generally speaking, several advanced driving circuits add one or more control lines to

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18

CHANG, YU-SIN, and 張玉信. "The Transient Analysis of the Organic Light-Emitting Diode Driven by Pulse-Width Modulation Signals." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/k2rwhy.

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碩士<br>國立臺北科技大學<br>光電工程系<br>107<br>This thesis research applies Pulse-Width Modulation (PWM) technique to investigate the feasibility of reducing current-surge phenomena as an organic light-emitting diode (OLED) is driven by pulse-wise signal. The occurrence of current-surge is mainly caused by the capacitive effect of an OLED in which the organic layers are sandwiched by anode and cathode electrodes. We used PSPICE simulation tool to reproduce the current-surge phenomena by using the equivalent-circuit model of an OLED and calculate the differences of peak-to-peak values before and after apply

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Huang, Ta-Ko, and 黃大可. "Reducing, by pulse width modulation, the curing temperature of a prototype high power LED light curing unit." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/81919461298469703717.

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HSU, TZU-HUAN, and 徐子桓. "The Transient Characteristics of Blue, Purple, and Ultraviolet Light-Emitting Diodes by Pulse-Width Modulation for Color-Tunable Application." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8p4zvj.

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碩士<br>國立臺北科技大學<br>光電工程系<br>107<br>This thesis research applied Pulse-width-modulation (PWM) signals on blue, purple, and ultraviolet (UV) light-emitting diodes (LED) respectively to investigate the optimal driving conditions for the potential applications of color-tunable LED’s by using HSPICE simulation tool. We reproduced relative parameters of these LED’s as controls under 20mA direct-current (DC) driving conditions by using equivalent-circuit model. The PWM signals in 1250Hz with 20mA to 120mA in average were applied to those LED’s to evaluate power consumptions and other parameters compar

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POLYCARPOU, CONSTANTINA. "Adaptive Detection of Arbitrarily Shaped Ultrashort Quantum Light States." Doctoral thesis, 2013. http://hdl.handle.net/2158/807677.

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First we investigate the generation of non-classical states of light by means of pulsed parametric down-conversion, and second their complete diagnostics and characterisation by means of pulsed homodyne detection. We introduce a new characterisation technique of quantum states of light (starting with the case of the single photon) that combines techniques from the fields of quantum optics and ultrafast coherent control: the idea is to generate femtosecond quantum light states with a broad spectrum, and then, through adaptive mapping of their spectro/temporal mode onto the reference field, to

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Moshirvaziri, Mazhar. "Ultracapacitor/Battery Hybrid Energy Storage Systems for Electric Vehicles." Thesis, 2012. http://hdl.handle.net/1807/33458.

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This thesis deals with the design of Hybrid Energy Storage System (HESS) for Light Electric Vehicles (LEV) and EVs. More specifically, a tri-mode high-efficiency non-isolated half-bridge converter is developed for the LEV based HESS applications. A 2 kW, 100 V interleaved two-phase converter prototype was implemented. The peak efficiency of 97.5% and a minimum efficiency of 88% over the full load range are achieved. Furthermore, a power-mix optimizer utilizing the real-time Global Positioning System (GPS) data for the EV based HESS is proposed. For a specific design, it is shown that at the co

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