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Dissertations / Theses on the topic 'Heterodyne effect'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Moussa, Ildoko. "Etude d'un système de multiplexage fréquentiel d'un faisceau lumineux par modulation acousto-optique." Valenciennes, 1985. http://www.theses.fr/1985VALE0006.

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Le principe consiste à moduler, non pas la source lumineuse, mais le faisceau lui-même. On réalise ensuite un hétérodynage optique entre le faisceau module et une partie non modulée de ce faisceau, prise comme référence. Transmission des deux faisceaux par fibre optique à une photodiode connectée directement à l'entrée d'un récepteur de télévision. Réalisation d'une transmission de trois canaux de télévision par une fibre optique

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2

Kamar, Nihad. "Maîtrise de l'entartrage dans des échangeurs de chaleur via l'utilisation de traitements physiques." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0209.

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L'objectif de ce travail est d'étudier l'impact d'un traitement « physique » sur la formation d'un dépôt minéral dans un échangeur de chaleur. Plus particulièrement, on s'intéressera à l'effet des ondes ultrasoniques, ainsi qu'à l'effet d'un traitement électromagnétique. Pour mener à bien cette étude, un pilote expérimental a été mis en place afin de tester ces traitements sur deux types d'échangeur de chaleur, un échangeur à plaques et joints et un échangeur platulaire. Plusieurs paramètres de fonctionnement tels que le débit, la durée et la température ont été testés expérimentalement, afin

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3

Malnou, Maxime. "High-Tc Josephson mixers for Terahertz detection." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066260/document.

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Cette thèse porte sur la fabrication et la caractérisation d'un mélangeur hétérodyne, à partir d'YBa2Cu3O7, un matériau supraconducteur à haute température critique. Nous avons évalué son potentiel pour la détection d'ondes térahertz. La physique complexe des jonctions irradiées a été correctement décrite en modifiant légèrement les équations quasi-classiques d'Usadel, originellement développées pour les supraconducteurs inhomogènes à basse température critique. Les mesures de transport électronique ont montré que nos dispositifs respectent le modèle de la jonction résistivement shuntée. Nous

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4

Dremetsika, Evdokia. "Nonlinear optics in graphene: Detailed characterization for application in photonic circuits." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/264211.

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In the quest for ultrathin materials compatible with CMOS technology for all-optical signal processing applications in integrated photonics, graphene appears to be a promising candidate, with broadband1 optical properties and a high and broadband optical nonlinearity. However, researchers do not agree on the value of its nonlinear refractive index, and commonly used characterization methods do not provide a clear picture of the optical nonlinearity, in terms of its tensor nature or relaxation time. In the first part of this thesis, apart from the previously used Z-scan method, we have also use

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5

Crotty, Maureen. "Signal to Noise Ratio Effects on Aperture Synthesis for Digital Holographic Ladar." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355245759.

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6

Wang, Junyang. "Dicke narrowing and speed-dependent effects in dispersion signals : Influence on assessment of concentration and spectral parameters by noise-immune cavity-enhanced optical heterodyne molecular spectrometry." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-70235.

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Laser spectroscopic techniques have, during the last decades, demonstrated an extraordinary capability for sensitive detection of molecular constituents in gas phase. Since spectra from such techniques constitute unique and characteristic signatures for each type of species, these techniques enable investigations of molecular structures as well as detection of the presence of species in a gas mixture. They are therefore used for a variety of application, from fundamental studies to the assessment of gas concentrations. In fact, quantitative assessments of gas concentrations by laser-based tech

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7

Vadalà, Giovanni. "Disorder, propagation and non-linear effects in photonic crystal waveguides." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3422364.

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The present work would like contribute to the research in this area, by offering some results on the optical properties, disorder and non-linear effects on wave propagation in semiconductor-based two-dimensional photonic crystal waveguides. The aim is to lead the reader from the basic concepts of photonic crystals (Chapter 1), up to the properties of a 2D photonic crystal (Chapter 2) and the defect line induced waveguide in a 2D photonic crystal (Chapter 3). The propagation properties, the unusual dispersion relation, and the particular regime, known as Slow Light regime, will be analyzed dep

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8

Robson, Laura E. "The Spatial Ecology of Eastern Hognose Snakes (Heterodon platirhinos): Habitat Selection, Home Range Size, and the Effect of Roads on Movement Patterns." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20452.

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Habitat loss is the greatest contributor to the decline of species globally and thus understanding habitat use and the consequences fragmentation has on biodiversity is a fundamental step towards management and recovery. I conducted a radio-telemetry study to examine the spatial ecology and the effects of roads on Eastern Hognose Snakes (Heterodon platirhinos), a species at risk, in the Long Point Region of Ontario, Canada. I tested habitat selection at multiple spatial scales and I found that within the home range, snakes avoided agricultural land and selected open sand barrens, particularly

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9

Feautrier, Philippe. "Jonctions SIS en Nb/Al2O3/Nb pour des récepteurs en radioastronomie millimétrique et submillimétrique." Phd thesis, Grenoble 1, 1992. http://tel.archives-ouvertes.fr/tel-00725267.

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Pour préparer les futures missions sur satellites en radioastronomie, le CNES est responsable d'un projet de ballon stratosphérique appelé PRONAOS-SMH pour lequel notre laboratoire doit construire le récepteur à 380 GHz. Ce projet est décrit dans l'introduction. Dans le premier chapitre, j'expose les bases de la supraconductivité, de l'effet Josephson et du fonctionnement du mélangeur SIS. Le chapitre II développe la technologie utilisée pour la fabrication des jonctions SIS: les principes de l'évaporation, de la pulvérisation, de la gravure et de la photolithographie y sont expliqués. Le troi

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10

Schoelkopf, Robert J. "Studies of noise in Josephson-effect mixers and their potential for submillimeter heterodyne detection." Thesis, 1995. https://thesis.library.caltech.edu/4221/1/Schoelkopf_rj_1995.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. This thesis describes both theoretical and experimental investigations into the dynamics and noise processes of Josephson junctions, with the intent of evaluating their potential as mixers in heterodyne instruments for submillimeter-wave (i.e., the frequency range from 300 GHz to 3THz) detection. Superconducting tunnel junctions utilizing the nonlinearity due to photon-assisted tunneling of quasiparticles (SIS mixers) have become the state-of-the-art technology for sensitive he

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11

Lu, Shin-Yu, and 呂馨予. "Measuring the linear electro-optic effect by using heterodyne interferometer based on single acousto-optic modulator." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/90611417166683670378.

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碩士<br>逢甲大學<br>光電研究所<br>100<br>In this research, we used optical heterodyne interferometry and RF phase-sensitive demodulation technique to measuring the linear electro-optic effect. The heterodyne interferometer is based on single acousto-optic modulator (AOM) with laser in double–pass scheme. Therefore, the components in the setup were much less than the literatures of which configurations were sophisticated, and the heterodyne frequency was operated at twice driven frequency of AOM. Notably, the arrangement was beneficial for eliminating the common-mode noise. In the first part of this

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12

Lin, Chu-En, and 林主恩. "Applications of balanced detection two-frequency heterodyne paired polarized polarimeter on magnetochiral effect and mutarotation kinetics measurement." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/77951373791928447292.

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博士<br>國立中央大學<br>光電科學研究所<br>98<br>In this article, balanced detection two-frequency heterodyne paired polarized polarimeter(BDTHP) is used to measure magnetochiral effect of Bi12SiO20 (BSO) crystal and ambient air. The Faraday rotation angle and Verdet constant of BSO crystal are 1.8×10-5(rad) and 5.27×10-5(rad/mT mm) respectively; the Faraday rotation angle and Verdet constant of ambient air are demonstrated as 5.2×10-6(rad) and 1.3×10-6(rad/mT m) respectively. In the experiment, measuring the magnetochiral effect of ambient air, the sensitivity of BDTHP is up to 1.74×10-7(rad) . If we appl

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13

Tseng, Kai-Han, and 曾楷涵. "Using Heterodyne optical polarimeter to study the effect on thermal denaturation of Collagen with Trifluoroethanol and Glycerol." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33911076802727391221.

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碩士<br>國立清華大學<br>生醫工程與環境科學系<br>101<br>Recently, many measurement methods have been used to study the structure change of protein after heating, such as differential scanning method, circularly polarized dichroism spectroscopy, X-ray diffraction crystallography method, etc. However, it is difficult for these methods to monitor the denaturation process of collagen solution in real time. In this study, a self-assembled optical heterodyne polarimeter that was capable of amplifying the optical rotation signal to 40-fold, and a precision thermoelectric cooler (TEC) were used to study the thermal dena

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14

Huang, Bo-Yu, and 黃博郁. "Using heterodyne optical polarimeter to study the effect on thermal denaturation of bovine serum albumin with sodium dodecyl sulfate." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/00026037951696224157.

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碩士<br>國立清華大學<br>生醫工程與環境科學系<br>101<br>In the past few years, many measurement methods have been used to study the structural change of protein after heating, such as differential scanning method,circularly polarized dichroism spectroscopy, X-ray diffraction crystallography method,etc. However, these methods are not easy to monitor the denaturation process of BSA aqueous solution in real time. In this study, a homemade optical heterodyne polarimeter that was capable of amplifying the optical rotation signal for 20-fold was built up by authors, and with the use of precision thermoelectric cooler

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15

Hsieh, Cheng-Hung, and 謝政宏. "Effect of multiple-reflection on optical birefringence characterization of a multiple-order wave plate by using phase-sensitive heterodyne ellipsometry." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/42781542117046752564.

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碩士<br>國立陽明大學<br>生醫光電工程研究所<br>94<br>To characterize multiple order wave plate (MWP) of a linear birefringent material is important because MWP is critical to the oblique incident of laser beam that MWP can become a tilted wave plate (TWP) for spectral tuning or filtering device in polarization optics. In order to avoid the oscillation of MWP on phase retardation detection, an anti-reflection coated MWP is required that the multiple-reflection of MWP can be reduced significantly. In this study, we propose a novel phase-sensitive optical heterodyne ellipsometer to verify that the oscillation on

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16

郭羽眉. "Investigation of Ionic Effects of a Twisted Nematic Liquid Crystal Cell by Heterodyne-Interferometric Phase Measurements." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/61314348214613022581.

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碩士<br>國立交通大學<br>光電系統研究所<br>101<br>For the first time, we report the usage of heterodyne-interferometric phase measurements to study electro-optical effects of a rubbed-polyimide-aligned twisted nematic (TN) liquid crystal (LC) cell caused by ionic impurities within the cell. Our experimental results have confirmed that, in some cases, the dominant ionic species in LC mixtures used for TFT-TNs came from impurities of low-ionization-rate(LIR) in agreement with recent publications. However, for the first time, we have observed, in some cases, ions from both high-ionization-rate (HIR) and LIR impu

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