Academic literature on the topic 'Heterodyne effect'

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Journal articles on the topic "Heterodyne effect"

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Tan, Zhenkun, Jiao Wang, Yingxiu Kong, Sichen Lei, and Pengfei Wu. "An Effective Method for Enhancing Heterodyne Efficiency by Comparing the Effect of Degree of Polarization on an Uplink Path and a Downlink Path." Photonics 9, no. 11 (2022): 798. http://dx.doi.org/10.3390/photonics9110798.

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By analyzing the effect of the degree of polarization (DoP) of the partially coherent Gaussian Schell-model (GSM) beam on a heterodyne system of an uplink path and a downlink path, we developed an innovative and noteworthy theory according to which σsy (signal beam waist radius in the y direction component) and δSyy (coherence length of the signal beam in the yy direction component) had a more significant impact on heterodyne efficiency and DoP than the turbulence term on uplink and downlink paths. Namely, the DoP and heterodyne efficiency of an uplink path are higher than that of a downlink p
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Yamamoto, Naoko, Yuya Shinohara, Hiroyuki Kishimoto, Norihiro Matsumoto, and Yoshiyuki Amemiya. "Dynamics of nanoparticles in elongated rubber investigated with heterodyne XPCS." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1331. http://dx.doi.org/10.1107/s2053273314086689.

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Addition of nanoparticles into rubber is indispensable process for production of rubbery materials, as it improves the viscoelastic and mechanical properties of rubber (reinforcement effect). However, the understanding of reinforcement effect is far from satisfactory in spite of many studies. Further microscopic-scale investigation is required for controlling and improving the properties of rubbery materials. Aiming to construct a microscopic model of filled rubber under elongation, we have investigated nanoparticle dynamics in uniaxially stretched rubber using heterodyne X-ray photon correlat
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Cuberes, M. Teresa. "Intermittent-Contact Heterodyne Force Microscopy." Journal of Nanomaterials 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/762016.

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Heterodyne Force Microscopy opens up a way to monitor nanoscale events with high temporal sensitivity from the quasistatic cantilever mechanical-diode response taking advantage of the beat effect. Here, a novel heterodyne ultrasonic force method is proposed, in which the cantilever is driven in amplitude-modulation mode, at its fundamental flexural eigenmode. Ultrasonic vibration in the megahertz range is additionally input at the tip-sample contact from the cantilever base and from the back of the sample. The ultrasonic frequencies are chosen in such a way that their difference is coincident
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Reno, Jessica, Bhanu Korremula, and Dominick J. Casadonte. "Heterodyne I: Enhancing sonochemical efficiency through application of the heterodyne effect: An initial study." Ultrasonics Sonochemistry 56 (September 2019): 143–49. http://dx.doi.org/10.1016/j.ultsonch.2019.04.014.

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Song, Xue, Guofeng Shen, and Dmitry Grishenkov. "A comparative study on detection of polymer-shelled microbubbles by different excitation pulses." Journal of the Acoustical Society of America 154, no. 1 (2023): 482–93. http://dx.doi.org/10.1121/10.0020293.

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Contrast agents are widely used in ultrasound imaging. Many imaging techniques have been developed to improve the contrast between tissue and the agents, based on the nonlinear response of microbubbles. In this study, heterodyne excitation was introduced and was compared with traditional sinusoidal signal and chirp excitation for visualizing polymer-shelled microbubbles and degassed water in a tissue-mimicking phantom. Pulse inversion technique was implemented under plane wave (PW) and focused imaging mode. Image enhancement was evaluated by contrast-to-tissue ratio (CTR) at different transmit
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Gershgorin, B., V. Yu Kachorovskii, Y. V. Lvov, and M. S. Shur. "Field effect transistor as heterodyne terahertz detector." Electronics Letters 44, no. 17 (2008): 1036. http://dx.doi.org/10.1049/el:20080737.

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Izumi, Ryo, Yan Jun Li, Yoshitaka Naitoh, and Yasuhiro Sugawara. "Study of high–low KPFM on a pn-patterned Si surface." Microscopy 71, no. 2 (2022): 98–103. http://dx.doi.org/10.1093/jmicro/dfab055.

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Abstract Comparative measurements between frequency modulation Kelvin probe force microscopy (FM-KPFM) using low frequency bias voltage and heterodyne FM-KPFM using high frequency bias voltage were performed on the surface potential measurement. A silicon substrate patterned with p- and n-type impurities was used as a quantitative sample. The multi-pass scanning method in the measurements of FM-KPFM and heterodyne FM-KPFM was used to eliminate the effect of the tip–sample distance dependence. The measured surface potentials become lower in the order of the p-type region, n-type region and n+-t
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Xiong, Si Ya Dong, Yi Yang, Chao Peng, Zhen Rong Zhang, and Zheng Bin Li. "The Effect of Polarization Control in Loss-Compensated Recirculating Delayed Self-Heterodyne Interferometry Measurement of Laser Linewidth." Applied Mechanics and Materials 303-306 (February 2013): 859–62. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.859.

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In the implementation of the loss-compensated recirculating delayed self-heterodyne interferometry (LC-RDSHI) measurement of laser linewidth, we observe the fluctuations among the different orders of beat spectra, which are not expected according to theoretical analysis and may lead to the distortion of lineshape and inaccurate estimation of the laser linewidth. To explain the observation, we in this paper simplify the polarization model in the recirculating heterodyne ring interferometer containing a polarization controller (PC) and point out the effect of the polarization control in the LC-R
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Belen’kii, Mikhail S. "Effect of atmospheric turbulence on heterodyne lidar performance." Applied Optics 32, no. 27 (1993): 5368. http://dx.doi.org/10.1364/ao.32.005368.

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Lin, Yao, John Schill, and Run-Wen Wang. "Instrumental noise effect in an optical heterodyne profiler." Applied Optics 33, no. 22 (1994): 5005. http://dx.doi.org/10.1364/ao.33.005005.

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Dissertations / Theses on the topic "Heterodyne effect"

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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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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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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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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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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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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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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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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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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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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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Book chapters on the topic "Heterodyne effect"

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Humbert, Laurent, Valéry Valle, and Mario Cottron. "Identification of Three-dimensional Effects in Cracked Plates from Quasi-heterodyne Interferometry." In Interferometry in Speckle Light. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57323-1_65.

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Mlynek, J., Chr Tamm, E. Buhr, and W. Lange. "Raman Heterodyne Detection of Radio-Frequency Resonances in Sm Vapor: Effects of Velocity-Changing Collisions." In Springer Series in Optical Sciences. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-540-39664-2_27.

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Ishikawa Haruto, Kim Seongheun, Finkelstein Ilya J., and Fayer Michael. D. "Ultrafast 2D-IR Vibration Echo Spectroscopy of Proteins." In Advances in Biomedical Spectroscopy. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-045-2-79.

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The investigation of protein structural dynamics on short time scales (100 fs to 100 ps) using ultrafast two dimensional (2D-IR) vibrational echo spectroscopy is presented. Under thermal equilibrium conditions, a protein's structure is constantly fluctuating among conformations associated with different positions on the broad rough minimum on the free energy landscape. Although different conformational substates may be apparent in a vibrational absorption spectrum, linear IR absorption spectra cannot provide information on structural dynamics because dynamical information is masked by inhomoge
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"HETERODYNED KERR EFFECT MEASUREMENTS." In Handbook of Nonlinear Optics. CRC Press, 2003. http://dx.doi.org/10.1201/9780203912539-18.

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Sutton, B. D., J. W. Ferguson, C. Pryer, E. Price, and D. Thomas. "Application of Continuous Velocity of Detonation Diagnostics to PE4 Cylinder Tests." In Future Developments in Explosives and Energetics. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781839162350-00135.

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Velocity of detonation (VoD) is an important and often measured parameter for characterising explosive materials. This is traditionally measured using discrete time of arrival probes; time of arrival is plotted against position and a line of best fit used to find the VoD. This necessitates the use of a large amount of explosive material to allow steady state detonation to be reached prior to taking the measurement and provides no information on detonation propagation prior to this state being reached. A continuous method of measuring the VoD would allow smaller sample sizes to be used and woul
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Sutton, B. D., J. W. Ferguson, C. Pryer, E. Price, and D. Thomas. "Application of Continuous Velocity of Detonation Diagnostics to PE4 Cylinder Tests." In Future Developments in Explosives and Energetics. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781788017855-00135.

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Velocity of detonation (VoD) is an important and often measured parameter for characterising explosive materials. This is traditionally measured using discrete time of arrival probes; time of arrival is plotted against position and a line of best fit used to find the VoD. This necessitates the use of a large amount of explosive material to allow steady state detonation to be reached prior to taking the measurement and provides no information on detonation propagation prior to this state being reached. A continuous method of measuring the VoD would allow smaller sample sizes to be used and woul
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Conference papers on the topic "Heterodyne effect"

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Manriquez, Jose Soto. "Phase matching memory effect in optical coherent transient effects." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thjj5.

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It has been generally accepted that the off-resonance heterodyne optical field in Stark-switching and frequency-switching techniques does not have any measurable influence in photon echo and other related experiments. In this work we present theoretical and experimental evidence that through a previously unknown memory effect the heterodyne field produces important undulations in the decay curves of photon echo. This effect appears to be also responsible for other experimental anomalies observed in optical coherent transient effects.1
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Iftekharuddin, K. M., and M. A. Karim. "Effect of background radiation noise on heterodyne detection efficiency in the use of a diffraction-free beam." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thv3.

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Several experiments have been carried out to maximize optical heterodyne efficiency when the Gaussian laser beam is used as the signal field.1 Further, it has already been shown that heterodyne efficiency is significantly improved with the use of the diffraction-free Bessel beam in the absence of noise.2 However, for most of the small signal detection schemes, background radiation noise is known to limit the achievable SNR. In our present work we consider background noise effect on the maximum heterodyne efficiency when the Bessel beam is used as the signal, and we accordingly investigate the
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Zhengfang, Song, Gu Weiyu, and Liu Xiachun. "The Optical Heterodyne Detection in a Turbulent Atmosphere." In Optical Remote Sensing. Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ors.1985.tuc3.

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It is well-known that atmospheric turbulence has a serious effect on optical heterodyne detection. However, the effect of the turbulent outer scale up to date has not an acknowledged view yet. Lutomirski and Yura [1] considered that the presence of a definite outer scale could increase the signal-to-noise ratio of heterodyne detection slightly. Clifford and Wandzura [2] indicated that the performance of a heterodyne lidar could be deteriorated with the outer scale. So it is still intrested to clarify the real action of the outer scale.
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Di Gaspare, Alessandra, Valeria Giliberti, Roberto Casini, et al. "Antenna-coupled heterostructure field effect transistors for integrated terahertz heterodyne mixers." In SPIE OPTO, edited by Laurence P. Sadwick and Créidhe M. O'Sullivan. SPIE, 2013. http://dx.doi.org/10.1117/12.2004087.

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Marinchio, H., C. Palermo, G. Sabatini, et al. "Hydrodynamic simulation of heterodyne terahertz detection in a field effect transistor." In 2010 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010). IEEE, 2010. http://dx.doi.org/10.1109/icimw.2010.5612505.

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Yan, Zhifeng, Jingxuan Zhu, Xinnan Lin, et al. "A generic numerical model on heterodyne terahertz detection in field effect transistor." In 2010 3rd International Congress on Image and Signal Processing (CISP). IEEE, 2010. http://dx.doi.org/10.1109/cisp.2010.5647135.

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Aoyama, Hajime, Fumiaki Kumasaka, Yoshihisa Iba, et al. "Effect of SiC x-ray masks on alignment accuracy of heterodyne alignment." In Microlithography '97, edited by David E. Seeger. SPIE, 1997. http://dx.doi.org/10.1117/12.275796.

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Shani, Yosi, Rod Alferness, Tom Koch, et al. "Polarization rotation in asymmetric periodic loaded rib waveguides." In Integrated Photonics Research. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ipr.1991.thh3.

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Polarization rotation is an important effect in integrated optics. It is required in balanced polarization diversity heterodyne receivers and in polarization controllers. Polarization rotation has been demonstrated in LiNbO3 and in III-V waveguides using the electro-optic effect1−3 and LiNbO3 using the photo-elastic effect.4
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Gunther, Jacqueline, Baptiste Jayet, Michael Amissah, and Stefan Andersson-Engels. "Imaging speckle decorrelation effect with combined acousto-optical imaging with off-axis heterodyne holography for biomedical applications." In European Conference on Biomedical Optics. Optica Publishing Group, 2021. http://dx.doi.org/10.1364/ecbo.2021.em3d.3.

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Using off-axis heterodyne holography, we present acousto-optical measurements of two phantoms: a silicon (no decorrelation) and a gel phantom (decorrelation). Decorrelation of the two media show differing trends that need to be understood to move towards in-vivo imaging.
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Thantu, Napoleon. "Time-resolved optical heterodyne detected raman induced kerr effect spectroscopy for chemical analyis." In Laser Applications to Chemical and Environmental Analysis. OSA, 2001. http://dx.doi.org/10.1364/lacea.2000.pd5.

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Reports on the topic "Heterodyne effect"

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Mercer, Linden B. 1/F Frequency Noise Effects on Self-Heterodyne Linewidth Measurements for Coherent Communications. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada227942.

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