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Artykuły w czasopismach na temat "Capteur de front d’onde"
Wattellier, Benoit. "Acheter un analyseur de front d’onde". Photoniques, nr 117 (2022): 51–56. http://dx.doi.org/10.1051/photon/202211751.
Pełny tekst źródłaPopoff, Sébastien M., i Sylvain Gigan. "Contrôle de front d’onde de la lumière en milieux complexes: 10 ans d'avancées scientifiques". Photoniques, nr 111 (listopad 2021): 37–41. http://dx.doi.org/10.1051/photon/202111137.
Pełny tekst źródłaBègue, Aurélien, Francesca Anselmi, Eirini Papagiakoumou i Valentina Emiliani. "Modulation du front d’onde pour l’excitation biphotonique en optogénétique". médecine/sciences 27, nr 10 (październik 2011): 811–13. http://dx.doi.org/10.1051/medsci/20112710006.
Pełny tekst źródłaMounaix, Mickaël, Hugo Defienne i Sylvain Gigan. "Contrôle spatio-temporel de la lumière en milieux complexes". Photoniques, nr 92 (lipiec 2018): 29–33. http://dx.doi.org/10.1051/photon/20189229.
Pełny tekst źródłaVignal, R., D. Tanzer, T. Brunstetter i S. Schallhorn. "Lumière diffractée et sensibilité à l’éblouissement après PKR et LASIK guidés par front d’onde". Journal Français d'Ophtalmologie 31, nr 5 (maj 2008): 489–93. http://dx.doi.org/10.1016/s0181-5512(08)72465-3.
Pełny tekst źródłaPruvost, Laurence, i Thierry Ruchon. "Vortex optiques en interaction avec des atomes". Reflets de la physique, nr 75 (kwiecień 2023): 10–16. http://dx.doi.org/10.1051/refdp/202375010.
Pełny tekst źródłaFraser, Alexandra, Nicolas Fontaine i Valérie Lambert. "Aberrations du front d’onde chez des porteurs de LC souples asphériques et des porteurs de LC sphériques". Canadian Journal of Optometry 77, nr 3 (13.10.2015): 13. http://dx.doi.org/10.15353/cjo.77.495.
Pełny tekst źródłaGatinel, D., N. Fayol i T. Hoang-Xuan. "369 Utilisation d’un analyseur de front d’onde Schack-Hartman pour évaluer la dispersion lumineuse causée par les structures chez des patients présentant des opacités cornéennes ou cristalliniennes". Journal Français d'Ophtalmologie 30 (kwiecień 2007): 2S259–2S260. http://dx.doi.org/10.1016/s0181-5512(07)80182-3.
Pełny tekst źródłaProenca Pina, J., J. L. Febbraro, D. Gatinel i T. Hoang-xuan. "102 Intérêt des traitements personnalisés guidés par le recueil du front d’onde avc le laser excimer Star S5® pour la préservation ou la restauration de la qualité de vision après chirurgie réfractive". Journal Français d'Ophtalmologie 28 (marzec 2005): 174. http://dx.doi.org/10.1016/s0181-5512(05)74498-3.
Pełny tekst źródłaPassilly, Bruno, Benjamin Lamboul i Jean-Michel Roche. "Indentation haute fréquence : vers le contrôle non-destructif des structures". Matériaux & Techniques 105, nr 1 (2017): 110. http://dx.doi.org/10.1051/mattech/2017026.
Pełny tekst źródłaRozprawy doktorskie na temat "Capteur de front d’onde"
Begani, Provinciali Ginevra. "X-ray phase imaging based on Hartmann Wavefront Sensor for applications on the study of neurodegenerative diseases". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. https://theses.hal.science/tel-03670415.
Pełny tekst źródłaThe aim of this PhD thesis is to develop the technic of X-ray phase imaging with Hartmann wavefront sensor for various applications and to compare this new system against well-established phase-contrast techniques. The X-ray phase imaging will be mainly performed in 3D using tomographic setup. The main application includes the study of alteractions in the central nervous system induced by neurodegenerative diseases. The first introductory section describes the basic aspects of X-ray interaction with matter and of yhe coherence theory with specific application to the Hartmann wavefront sensor design. In the second chapter, an introduction to the free-space propagation technique. The third chapter examines the principles of tomography acquisitions and the available reconstruction algorithms. A separate chapter, labeled 4, is dedicated to the theory of Hartmann wavefront sensor. A 3D wave propagation model based on Fresnel propagator was developed to optimize the architecture of the full wavefront sensor including the Hartmann plate, the distances between the different elements of the set-up as well as the X-ray source. The model can manage any degree of spatial coherence, enabling the accurate simulation of a wide range of X-ray sources. Several simulations of standard experimental situations are described to valid the program. Then, the main wavefront reconstruction algorithms have been analyzed. In chapter 5, we will present experimental results obtained with the X-ray Hartmann wavefront sensor using both a parallel beam geometry (synchrotron measurements) and a cone beam geometry (laboratory measurements). Different Hartmann plates were used with the laboratory set-up to visualize a series of test and biological samples. also, using synchrotron, we tested the Hartmann sensor to retrieve the chemical composition of objects composed of known materials. The chemical composition could be inferred starting from direct and independent measurements of the real part (proportional to the phase) and the imaginary part (proportional to the absorption) of the sample refractive index. In chapter 6, the experimental results obtained with free space propagation X-ray phase contrast tomography will be discussed. We exploited the capability of X-ray phase contrast imaging to investigate the effects of neurodegenerative diseases on the central nervous system
Gatinel, Damien. "Une nouvelle méthode de décomposition polynomiale d’un front d’onde oculaire". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV042/document.
Pełny tekst źródłaThe eye vision defaults are analyzed and classified by studyingthe corresponding eye wavefront. After presenting the orthogonal basis, called the Zernike basis, that is currently used for the medical diagnosis, a new decomposition basis is built. It is based on the use of the space of polynomials of valuation greater or equal to L+1 (for L a natural integer). It allows to uniquely decompose a polynomial wavefront into the sum of a polynomial of low degree (lesser or equal to L) and a polynomial of high valuation (greater or equal to L +1). By choosing L = 2, a new decomposition, called D2V3, is obtained where the polynomial wavefront of high degree does not include terms of radial degree lesser or equal to 2. In particular, it allows to quantify perfectly the aberrations that can be corrected by eyeglasses or not. Various clinical examples clearly show the interest of this new basis compared to a diagnosis based on the Zernike decomposition
Saucourt, Jérémy. "Nouveau procédé dynamique d’analyse et de contrôle du front d’onde synthétique de réseaux de lasers". Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0050.
Pełny tekst źródłaFuturistic projects such as nuclear fusion power generation, or interstellar navigation by solar sails, require the use of a light source of extreme brightness. In order to increase the brightness of laser sources, my thesis work focused on the coherent beam combination of laser arrays. They led to the development of a new compact control process for the synthetic wavefront formed by the laser beam array. This process makes it possible to tailor the intensity pattern of the far field and thus control the angular distribution of energy emitted by the laser beam array. The process developed uses a phase/amplitude converter module with an integrated diffuser element. A method of measuring the transfer matrix of an optical system has been developed to characterize this field converter module. At any time, the synthetic wavefront is estimated by a phase recovery loop based on an alternating projections algorithm. This approximate calculation makes it possible to gradually adjust the phase relationships of the laser beam array to the desired arbitrary phase set. The process allows the control of a synthetic wavefront in less than 10 phase corrections, almost independently of the number of laser beams to be controlled. It is resistant to environmental defects and independent of the initial phase set. I demonstrated the compactness of the system studied by analyzing and controlling a 4 cm large synthetic pupil, composed of 16 beams, using an analysis module measuring only 30 cm. I also experimentally showed the control of the network phases of 16 to 100 laser beams with residual errors of λ/30 and λ/20 rms respectively. The capabilities of this method can be extended to control the higher Zernike orders of the synthetic wavefront, or more generally to directly measure the wavefront of coherent radiation
Grappin, Florence. "Capteur multicanal à grand champ pour la détection d'ultrasons : matériaux pour l'adaptation dynamique de front d'onde : étude et implantation du capteur". Paris 11, 2004. http://www.theses.fr/2004PA112038.
Pełny tekst źródłaUltrasonic waves are often used by industrials to test the structure of parts. Most of time, they work with piezoelectric transducers to generate and detect these waves but this technique needs a contact between the object to test and the transducers whereas optics allows to have non-contact and non-destructive systems (“laser-ultrasonic”). The optical detection of ultrasonic waves consists in the demodulation of the phase modulation carried by the laser beam that is backscattered by the part in which ultrasonic waves propagate. An interferometer operates this demodulation. Because of the roughness of the object’s surface, the interferometer has to be speckle insensitive. The holographic ultrasonic sensor is an interferometer that demodulates the phase in real time thanks to dynamical gratings written in a photorefractive material. The presented work can be divided into two parts. First, we studied photorefractive materials to improve the results achieved by the sensor. We compared experimental measurements for semi-conductors crystals (InP, CdTe) with the theoretical model describing their photorefractive properties. We also created a new method to characterize photorefractive multiquantum wells at a fixed wavelength and compared their efficiency in the sensor with the one obtained with bulk crystals. Second, we developed the multichannel photorefractive ultrasonic sensor. We studied the means to implement the imaging systems necessary to work with several testing points on the object, and the consequences on the eventual presence of cross-talk. Then, we implemented the experimental setup and demonstrated the simultaneous demodulation of different ultrasonic signals
Begue, Aurélien. "Optogénétique bi-photonique". Thesis, Paris 5, 2012. http://www.theses.fr/2012PA05T060.
Pełny tekst źródłaOptogenetics relies on the genetically targeted expression of light sensitive proteins in specific cell populations. This novel field has had a large impact in neuroscience, allowing both monitoring and stimulating the activity of specific neuronal populations, in intact brain preparations. Optogenetic tools have been used to record functional signals, such as changes in membrane potential or intracellular calcium concentration, as well as to modulate the excitability of neurons. To fully exploit the potentiality of optogenetics, new microscopy techniques have been developed to optimize illumination of photo-active compounds in situ. In particular, an important effort has been directed towards improving the spatial and temporal resolution of light stimulation, in order to match the dynamics of physiological processes. In this frame, the use of two-photon excitation becomes necessary to ensure penetration of light in scattering biological tissues, as well as confining the excitation volume and improve the specificity of illumination. My thesis was dedicated to the development and use of advanced optical methods for two-photon excitation of optogenetic tools. In a first project, we combined optical approaches (generalized phase contrast and temporal focusing) to perform two-photon activation of neurons expressing the light-sensitive cationic channel channelrhodopsin-2 (ChR2). Our work demonstrated for the first time the simultaneous generation of action potentials in multiple neurons, while maintaining a micrometric axial and lateral resolution. These results pointed out the advantages of light sculpting to increase both the specificity and the flexibility of photo-stimulation.In order to investigate the potential of this technique for efficient in-depth stimulation, we therefore studied the propagation through scattering biological media of laser beams generated by two different light patterning techniques, generalized phase contrast and digital holography in combination with temporal focusing. We demonstrated that temporal focusing enabled the excitation volumes to maintain micrometric axial confinement, as well as to maintain well defined patterns deep inside tissues. We also demonstrated for the first time the activation of ChR2 at depth over 200 μm.Finally, the last part of my PhD was focused on testing light patterning methods for the activation of two other photosensitive proteins, the excitatory channel C1V1 and the inhibitory pump, halorhodopsin
Coquand, Mathieu. "Méthode de rétrovisée pour la caractérisation de surfaces optiques dans une installation solaire à concentration". Thesis, Perpignan, 2018. http://www.theses.fr/2018PERP0001/document.
Pełny tekst źródłaConcentrated solar power is a promising way for renewable energy production. Optical efficiency of the mirrors is one of the key factors influencing a power plant performance. Methods which allow the operator to adjust all the heliostat of a plant quickly, in addition of calibration and tracking, are essential for the rise of the technology. The work presented in this thesis is the study of a “backward-gazing” method consisting in placing four cameras near the receiver simultaneously recording brightness images of the sun reflected by the heliostat. The optical errors of the mirrors are retrieved from these four images and the knowledge of the one dimension sun radiance profile.The first step of the study consists in the theoretical description of the method. Then numerical simulations are performed to estimate the general accuracy and the limits of the backward-gazing method. In a third phase, experimental tests have been fulfilled at Themis solar power plant. Finally, ideas of improvement are proposed based on the experiments performed
del, Hougne Marc Philipp. "Shaping Green's Functions in Cavities with Tunable Boundary Conditions : From Fundamental Science to Applications". Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC111.
Pełny tekst źródłaIn this thesis, the shaping of microwave fields in chaotic cavities with tunable boundary conditions is studied experimentally. The experiments leverage a metasurface reflect-array that partially covers the cavity walls to tune the reverberation of waves inside the cavity. The first chapter explores several fundamental aspects. First, the achievable degree of control over stationary monochromatic wave fields is thoroughly investigated, and various regimes are identified, ranging from partial control over the wave field up to the limiting case of discrete resonances that can be tuned at wish. Next, the possibility to convert a cavity of regular geometry into one displaying chaotic characteristics by modulating the boundary conditions is examined and an application to non-mechanical mode-stirring in reverberation chambers is given. Then, the ability to tune the coupling between an antenna inside a cavity and the cavity itself is studied, revealing the opportunity of achieving (dynamically tunable) perfect impedance matching. The chapter goes on to consider spatio-temporal wave fields, and the re-focusing of such transient fields at a desired instant with the purely spatial control of the metasurface is demonstrated; moreover, the interplay of spatial and temporal degrees of freedom is addressed. Finally, an experimental platform enabling the rapid modulation of cavity boundary conditions within the photon lifetime is presented. The second chapter considers applications to multi-user wireless communication systems. First, it is shown that a matrix formalism to capture the impact of the metasurface on the wave field can be formulated in the regime of low reverberation, and even without access to phase information focusing on a single as well as on multiple targets is demonstrated. Second, it is shown that the channel diversity, which dominates the achievable capacity of information transfer, can be optimized by tweaking the environment’s disorder; perfectly orthogonal channels are obtained without any software or hardware efforts on the transmit or receive side, and the benefits of the implied minimal cross-talk are illustrated for the scenario of wirelessly transmitting a full-color image. Third, the matrix formalism is leveraged to propose a scheme of analog computation that counter-intuitively uses a disordered instead of a carefully tailored propagation medium, by appropriately shaping the incident wave front. A proof-of-concept demonstration suggests that combining ubiquitous Wi-Fi hardware in an indoor environment with a simple metasurface is sufficient to implement the concept. Finally, the concept is also implemented in the optical domain using a multimode fiber. The third chapter outlines a few applications for sensors in context-aware environments. First, it is shown that by shaping ambient wave fields, they may be concentrated on harvesting devices to increase the output voltage available for sensor powering; moreover, the non-linear nature of the harvesting device enables to do so without direct feedback from the target, using indirect feedback from the second harmonic. Second, a smart around-the-corner motion detector for complex environments is presented, enjoying a co-design of hardware and processing software by using a dynamic metasurface aperture; the latter is essentially a small (but still electrically large) disordered cavity with tunable boundaries that leaks tunable random radiation patterns that couple differently to the environment’s modes. Third, it is shown that objects may be precisely localized in complex environments even if they are non-cooperative by establishing signatures of their location that leverage their scattering contribution; this is demonstrated both with a frequency diverse and a wavefront shaping scheme, and the equivalence of the respective degrees of freedom is established
Sinquin, Jean-Christophe. "Analyse de surface d'onde infrarouge par modulateur acousto-optique". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37618580c.
Pełny tekst źródłaLopez, Thomas. "Conception, fabrication et caractérisation de lentilles planaires nano-structurées dédiées aux capteurs d’images CMOS dans le proche-infrarouge". Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0019/document.
Pełny tekst źródłaThis work deals with the design, fabrication and characterization of nanostructuredplanar lenses dedicated to near infrared detection for CMOS image sensors.Applications and optronic systems involved in near infrared imaging have been investigatedin order to highlight the strong interest of CMOS images sensors for the 800-1100 nmspectral band. Limitations of silicon and pixel structure explain the integration of nanostructuredplanar lenses compatible with CMOS fabrication process : a plasmonic lens, a dielectricphase-Fresnel lens, a metallic Huygens lens and a gradient-index lens. 2D electromagneticsimulations of a CMOS pixel with each planar lens have demonstrated the good performanceof the Huygens lens for low fill factor pixels and the phase-Fresnel lens for standard pixels.3D simulations of these lenses have been performed for their integration and fabrication inCMOS image sensors. The 3D design by numerical simulations of a gradient-index lens hasshown its potential interest for CMOS pixels. The experimental performance of a dielectriclens "post-process" integrated/fabricated at LPN-CNRS and a metallic lens "in-process" by aCMOS foundy have been evaluated by electro-optical characterization. Several perspectivesof this work about lens fabrication and potential for improvement have been explored
Laude, Vincent. "Contributions au traitement optique du signal et aux ondes élastiques guidées". Habilitation à diriger des recherches, Université de Franche-Comté, 2002. http://tel.archives-ouvertes.fr/tel-00005804.
Pełny tekst źródłaCzęści książek na temat "Capteur de front d’onde"
MONNERET, Serge, Julien SAVATIER i Pierre BON. "Microscopie quantitative de phase par analyse de front d’onde". W Imageries optiques non conventionnelles pour la biologie, 7–34. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9132.ch1.
Pełny tekst źródłaStreszczenia konferencji na temat "Capteur de front d’onde"
Mauriet, Sylvain, Stéphane Abadie, Mathieu Mory i Pierre Lubin. "Simulation numérique du jet de rive généré par un front d’onde turbulent". W Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2008. http://dx.doi.org/10.5150/jngcgc.2008.012-m.
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