Готові списки джерел за темами / Adaptative optics

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Добірка наукової літератури з теми "Adaptative optics"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 10 лютого 2022

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Статті в журналах з теми "Adaptative optics"

QU Yu-fu, 屈玉福, 刘子悦 LIU Zi-yue, 江云秋 JIANG Yun-qiu, 周. 丹. ZHOU Dan, and 王一帆 WANG Yi-fan. "Self-adaptative variable-metric feature point extraction method." Optics and Precision Engineering 25, no. 1 (2017): 188–97. http://dx.doi.org/10.3788/ope.20172501.0188.

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Palacios-Navarro, Guillermo, Fernando Arranz Martínez, Raúl Martín Ferrer, and Pedro Ramos Lorente. "Compensation Techniques Aimed at Mitigating Vibrations in Optical Ground-Based Telescopes: A Systematic Review." Sensors 21, no. 11 (May 22, 2021): 3613. http://dx.doi.org/10.3390/s21113613.

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The objective of this study was to evaluate the performance of the different systems and techniques aimed at suppressing vibrations on optical ground-based telescopes. We identified the studies by searching three electronic databases (Science Direct, IEEE library and Web of Science) from the year 2000 to December 2020. The studies were eligible if they proposed systems focused on mitigating the effects of vibrations in optical telescopes and brought performance data. A total of nine studies met our eligibility criteria. Current evidence confirms the feasibility of adaptative optics (AO) systems based on closed-loop control to mitigate vibrations, although variations and additions should be made depending on their nature and characteristics in order to improve the performance of the proposed techniques. This systematic review was conducted to provide a state-of-the-art of the methods and techniques that have been developed over the past two decades. The review also points out some issues that demand future research.

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Faurobert, M., M. Carbillet, L. Marquis, A. Chiavassa, and G. Ricort. "Temperature gradient in the solar photosphere. Test of a new spectroscopic method and study of its feasibility for ground-based telescopes." Astronomy & Astrophysics 616 (August 2018): A133. http://dx.doi.org/10.1051/0004-6361/201833195.

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Context. The contribution of quiet-Sun regions to the solar irradiance variability is currently unclear. Some solar-cycle variations of the quiet-Sun physical structure, such as the temperature gradient, might affect the irradiance. The synoptic measurement of this quantity along the activity cycle would improve our understanding of long-term irradiance variations. Aims. We intend to test a method previously introduced for measuring the photospheric temperature gradient from high-resolution spectroscopic observation and to study its feasibility with ground-based instruments with and without adaptative optics. Methods. We used synthetic profiles of the FeI 630.15 nm obtained from realistic three-dimensional hydrodynamical simulations of the photospheric granulation and line radiative transfer computations under local thermodynamical equilibrium conditions. Synthetic granulation images at different levels in the line are obtained by convolution with the instrumental point spread function (PSF) under various conditions of atmospheric turbulence, with and without correction by an adaptative optics (AO) system. The PSF are obtained with the PAOLA software, and the AO performances are inspired by the system that will be operating on the Daniel K. Inouye Solar Telescope. Results. We consider two different conditions of atmospheric turbulence, with Fried parameters of 7 cm and 5 cm, respectively. We show that the degraded images lead to both a bias and a loss of precision in the temperature-gradient measurement, and that the correction with the AO system allows us to drastically improve the measurement quality. Conclusions. Long-term synoptic observations of the temperature gradient in the solar photosphere can be undertaken by implementing this method on ground-based solar telescopes that are equipped with an AO correction system.

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Casner, Alexis, and Jean-Pierre Delville. "Adaptative lensing driven by the radiation pressure of a continuous-wave laser wave upon a near-critical liquid–liquid interface." Optics Letters 26, no. 18 (September 15, 2001): 1418. http://dx.doi.org/10.1364/ol.26.001418.

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Ng, Cherlyn J., Randolph Blake, Martin S. Banks, Duje Tadin, and Geunyoung Yoon. "Optics and neural adaptation jointly limit human stereovision." Proceedings of the National Academy of Sciences 118, no. 23 (June 1, 2021): e2100126118. http://dx.doi.org/10.1073/pnas.2100126118.

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Stereovision is the ability to perceive fine depth variations from small differences in the two eyes’ images. Using adaptive optics, we show that even minute optical aberrations that are not clinically correctable, and go unnoticed in everyday vision, can affect stereo acuity. Hence, the human binocular system is capable of using fine details that are not experienced in everyday vision. Interestingly, stereo acuity varied considerably across individuals even when they were provided identical perfect optics. We also found that individuals’ stereo acuity is better when viewing with their habitual optics rather than someone else’s (better) optics. Together, these findings suggest that the visual system compensates for habitual optical aberrations through neural adaptation and thereby optimizes stereovision uniquely for each individual. Thus, stereovision is limited by small optical aberrations and by neural adaptation to one’s own optics.

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Figorilli, Simone, Federico Pallottino, Giacomo Colle, Daniele Spada, Claudio Beni, Francesco Tocci, Simone Vasta, et al. "An Open Source Low-Cost Device Coupled with an Adaptative Time-Lag Time-Series Linear Forecasting Modeling for Apple Trentino (Italy) Precision Irrigation." Sensors 21, no. 8 (April 9, 2021): 2656. http://dx.doi.org/10.3390/s21082656.

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Precision irrigation represents those strategies aiming to feed the plant needs following the soil’s spatial and temporal characteristics. Such a differential irrigation requires a different approach and equipment with regard to conventional irrigation to reduce the environmental impact and the resources use while maximizing the production and thus profitability. This study described the development of an open source soil moisture LoRa (long-range) device and analysis of the data collected and updated directly in the field (i.e., weather station and ground sensor). The work produced adaptive supervised predictive models to optimize the management of agricultural precision irrigation practices and for an effective calibration of other agronomic interventions. These approaches are defined as adaptive because they self-learn with the acquisition of new data, updating the on-the-go model over time. The location chosen for the experimental setup is a cultivated area in the municipality of Tenna (Trentino, Alto Adige region, Italy), and the experiment was conducted on two different apple varieties during summer 2019. The adaptative partial least squares time-lag time-series modeling, in operative field conditions, was a posteriori applied in the consortium for 78 days during the dry season, producing total savings of 255 mm of irrigated water and 44,000 kW of electricity, equal to 10.82%.

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Oliveira, Ana, Duarte Dias, Elodie Múrias Lopes, Maria do Carmo Vilas-Boas, and João Paulo Silva Cunha. "SnapKi—An Inertial Easy-to-Adapt Wearable Textile Device for Movement Quantification of Neurological Patients." Sensors 20, no. 14 (July 11, 2020): 3875. http://dx.doi.org/10.3390/s20143875.

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The development of wearable health systems has been the focus of many researchers who aim to find solutions in healthcare. Additionally, the large potential of textiles to integrate electronics, together with the comfort and usability they provide, has contributed to the development of smart garments in this area. In the field of neurological disorders with motor impairment, clinicians look for wearable devices that may provide quantification of movement symptoms. Neurological disorders affect different motion abilities thus requiring different needs in movement quantification. With this background we designed and developed an inertial textile-embedded wearable device that is adaptable to different movement-disorders quantification requirements. This adaptative device is composed of a low-power 9-axis inertial unit, a customised textile band and a web and Android cross application used for data collection, debug and calibration. The textile band comprises a snap buttons system that allows the attachment of the inertial unit, as well as its connection with the analog sensors through conductive textile. The resulting system is easily adaptable for quantification of multiple motor symptoms in different parts of the body, such as rigidity, tremor and bradykinesia assessments, gait analysis, among others. In our project, the system was applied for a specific use-case of wrist rigidity quantification during Deep Brain Stimulation surgeries, showing its high versatility and receiving very positive feedback from patients and doctors.

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Rivera-Araya, Javier, Michael Schlömann, and Gloria J. Levicán. "Comparative Study of NaCl-Tolerance Mechanisms in Acidophilic Iron-Oxidizing Bacteria and Archaea." Solid State Phenomena 262 (August 2017): 385–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.385.

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Chloride leaching is considered a promising alternative method to recover copper from chalcopyrite and other primary copper sulfides, because it favors the leaching kinetics and avoids passivation of minerals. Nevertheless, chloride ions are highly toxic for iron-oxidizing microorganisms that participate in the bioleaching process. A comparative genomic analysis was carried out based on the complete genomes of bacteria belonging to Nitrospirae, Firmicutes, Actinobacteria and Proteobacteria phyla, and of archaea belonging to Euryarchaeota and Crenarchaeota was carried out to identify molecular determinants involved in chloride tolerance of acidophilic iron-oxidizing microorganisms. The results obtained showed that representative Nitrospirae and Firmicutes harbor genes for the biosynthesis and uptake of compatible solutes such as ectoine, trehalose and potassium, which have been shown to have a role in salt tolerance. Microorganisms belonging to other phyla harbor genes for potassium transporters, but no genes for compatible solutes were detected. In agreement with the bioinformatic results, minimum inhibitory concentration (MIC) determinations and growth kinetics experiments showed that Leptospirillum ferriphilum (Nitrospirae) was more tolerant to NaCl than Acidithiobacillus ferrooxidans (Proteobacteria). Furthermore, it was observed that the addition of 0.5 mM ectoine to the L. ferriphilum culture stimulated growth in the presence of 100 mM NaCl. On the contrary, ectoine had no effect on the growth of At. ferrooxidans. These results suggest that ectoine and likely trehalose could play a key role in chloride tolerance in L. ferriphilum. conferring adaptative advantages compared to A. ferrooxidans and possibly other iron-oxidizing microorganisms.

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Fernández, Enrique Josua. "Adaptive Optics for Visual Simulation." ISRN Optics 2012 (December 24, 2012): 1–13. http://dx.doi.org/10.5402/2012/104870.

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A revision of the current state-of-the-art adaptive optics technology for visual sciences is provided. The human eye, as an optical system able to generate images onto the retina, exhibits optical aberrations. Those are continuously changing with time, and they are different for every subject. Adaptive optics is the technology permitting the manipulation of the aberrations, and eventually their correction. Across the different applications of adaptive optics, the current paper focuses on visual simulation. These systems are capable of manipulating the ocular aberrations and simultaneous visual testing though the modified aberrations on real eyes. Some applications of the visual simulators presented in this work are the study of the neural adaptation to the aberrations, the influence of aberrations on accommodation, and the recent development of binocular adaptive optics visual simulators allowing the study of stereopsis.

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Ivanova, Natalia. "Biomimetic optics: liquid-based optical elements imitating the eye functionality." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2167 (February 3, 2020): 20190442. http://dx.doi.org/10.1098/rsta.2019.0442.

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The optical systems mimicking the eye functions are of great importance in various applications including consumer electronics, medical equipment, machine vision systems and robotics. This optics offers advantages over traditional optical technologies such as the superior adaptation to changing conditions and the comprehensive range of functional characteristics at miniature sizes. This paper presents a review on the recent progress in the development of human eye-inspired optical systems. Liquid-based and elastomer-based tunable optical elements are discussed with the focus on the actuation mechanism, optical performance and the possibility of integration into artificial eye systems. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 3)’.

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Більше джерел

Дисертації з теми "Adaptative optics"

Saab, Kassem. "Optique adaptative pour les télécommunications optiques." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEO016/document.

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Les télécommunications optiques en espace libre sont capables d'autoriser des débits de plusieurs dizaines de gigabits par seconde. Pour traiter ces débits en bénéficiant des techniques développées dans le cadre de l'optique fibrée, il est souhaitable d'injecter le faisceau reçu dans une fibre monomode. Ainsi, l'optique adaptative est proposée pour limiter les pertes d'injection induites par la dégradation de la qualité du faisceau propagé à travers la turbulence atmosphérique.Dans ce travail nous considérons un lien entre un satellite et une station de réception au sol. En élévation haute lorsque les perturbations d'amplitude peuvent être moyennées en augmentant la taille de la pupille la correction de la phase par optique adaptative (OA) classique peut être suffisante. Mes travaux dans ce cadre portent sur la mise en œuvre expérimentale de l'optimisation du couplage entre un système d'OA classique et une fibre monomode, en corrigeant les aberrations différentielles entre la voie de mesure de la surface d'onde et la voie d'injection du signal corrigé par OA. Le travail accompli dans l'objectif de cette mise en œuvre, se résume par les tâches suivantes : Définition d'une méthode d'optimisation automatique de l'injection par contrôle d'un seul miroir déformable pour la correction conjointe des perturbations rapides de la phase et des aberrations différentielles quasi-statiques ; Étude numérique de l'implantation de la méthode définie par simulation end-to-end ; Mise en œuvre de la méthode en laboratoire sur le banc BOA en modélisant la turbulence atmosphérique par des écrans de phase en rotation et validation du fonctionnement de l'optimisation de l'injection en boucle fermée ; Application de la méthode sur le banc ODISSEE à l'OCA puis fermeture de la boucle sur un signal optique émis par le satellite japonais SOCRATE.Par ailleurs, le lien satellite doit être opérationnel sur une durée maximale. Pour cela, le système doit fonctionner même dans le cas où le satellite est bas sur l'horizon et donc lorsque la portion d'atmosphère traversée par le faisceau est épaisse. Dans ces conditions particulières, les perturbations induites par les fluctuations de l'indice de l'air sont plus fortes que pour l'observation astronomique, donc la correction simultanée de la phase et de l'amplitude est indispensable pour atteindre le taux d'injection désiré (> 50 %). La deuxième partie de la thèse se place dans ce cadre et est consacrée à l'étude de l'implantation expérimentale d'une approche innovante de la correction de la phase et de l'amplitude fondée sur l'utilisation d'un Mach-Zehnder en optique intégrée. Le travail réalisé dans cette partie comporte les points suivants : Élaboration du principe de la correction par un Mach-Zehnder et proposition d'un dispositif généralisé à N voies ; Étude analytique de la correction par le dispositif proposé ; Développement d'un algorithme de contrôle fondé sur l'architecture proposée en optique intégrée ;• Validation numérique du fonctionnement par simulation end-to-end ; Conception d'un prototype pour la validation expérimentale du concept
Free space optical communications are able to allow rates of several tens of gigabits/s. In order to process these flows and benefit from the techniques developed in the context of fiber optics, it is desirable to inject the received beam into a single mode fiber. In this case, adaptive optics is proposed to limit the injection losses induced by the degradation of the beam quality caused by the atmospheric turbulence.In this thesis, we consider a link between a satellite and a ground receiving station.For high elevations when amplitude perturbations can be averaged by increasing the size of the pupil and the correction of the phase is sufficient by conventional adaptive optics (AO), this work deals with the experimental implementation of the coupling optimization between a conventional AO and a single mode fiber, by correcting the non common path aberrations between the measurement path of the wave front and the injection path of the corrected signal. The accomplished work in this context is summarized by the following tasks: definition of an automatic injection optimization method by controlling a single deformable mirror for the parallel correction of fast phase disturbance and quasi-static differential aberrations; numerical study of the implementation of the proposed method defined end-to-end simulations ; implementation of the method in the laboratory on the BOA bench, modeling the atmospheric turbulence by rotating phase screens, and validation of the injection optimization in closed loop ; application of the method on the ODISSEE bench at the OCA and closing of the loop on a laser signal emitted by the Japanese satellite SOCRATE.Besides, the link must be operational for a maximum duration. Indeed, the system must operate even when the satellite is low on the horizon and, therefore, when the crossed portion of atmosphere is thick. In these particular conditions, the disturbances induced by the air index fluctuations are stronger than for astronomical observations, so that, the simultaneous correction of the phase and the amplitude is essential to reach the desired injection ratio (> 50 %). Based on this analysis, the second part of this thesis focuses on the study of the experimental implementation of an innovative approach of a phase and amplitude correction based on using an integrated Mach-Zehnder. The work done in this part consists in the following points : elaboration of correction principle by a Mach-Zehnder and proposition of a generalized device with N channels ; theoretical analysis of the superposition by the proposed device ; development of a control algorithm based on the architecture proposed in integrated optics ; numerical validation of operation by end-to-end simulations ; design of the prototype for the experimental validation of the concept in the laboratory

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Blary, Flavien. "Caractérisation et modélisation de la turbulence optique en espace confiné." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4131/document.

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La turbulence optique et son impact sur les images obtenues à partir d'instruments de mesure est un phénomène connu dans le domaine de l'astronomie. Des modèles issus de la théorie de Kolmogorov, développée pour une turbulence dynamique, ainsi que des méthodes de correction, telles que l'optique adaptative, existent pour l'analyse et la compensation des effets de cette turbulence optique. L'analyse de cette dernière dans les milieux confinés est cependant plus limitée. Les sources susceptibles de générer une turbulence optique dans ces espaces sont pourtant multiples et peuvent avoir un impact non négligeable sur les mesures des instruments installés à proximité. Ce mémoire constitue une première approche de la caractérisation de la turbulence optique dans un espace confiné. Après l'introduction des phénomènes étudiés et des outils mathématiques employés, ce mémoire présente les résultats issus d'analyses de coupoles de télescopes et de caractérisations de salles blanches employées par l'entreprise Thales Alenia Space pour l'intégration et le test d'instruments optiques. Ces résultats sont obtenus avec l'instrument INTENSE, développé durant la thèse pour la caractérisation de la turbulence optique locale via la mesure des fluctuations des angles d'arrivée de multiples faisceaux lasers. En prévision de futurs améliorations de l'analyse de la turbulence en espace confiné, un chapitre du mémoire est dédié aux travaux réalisés sur une méthode d'extraction du profil de l'énergie de la turbulence et à son application sur l'instrument INTENSE. Les conclusions et les perspectives des travaux réalisés pendant la thèse sont présentées à la fin du mémoire
Optical turbulence and its impact on measured images is a well-known phenomenon in astronomy. Models based on the Kolmogorov theory, elaborated for a dynamical turbulence description, and methods, such as Adaptive Optics, were both developed so as to understand and correct the degradations caused by this turbulence. Analysis of the same phenomenon in indoor situation was however less investigated. The local air volume is nonetheless prone to optical perturbations sources which could have non negligible impacts on the measurements of instruments installed at proximity. This document introduces a first approach of indoor optical turbulence characterization. After the introduction of the studied phenomenon and the mathematical tools employed, this thesis present optical turbulence characterizations inside Thales Alenia Space clean rooms used for optical instrument integration and testing. Analyses inside telescope domes are also shown in this document. All the results were obtained using the INTENSE instrument which was developed during the thesis for optical turbulence characterizations using angle of arrival fluctuations of laser beams. In anticipation for future ameliorations of optical turbulence analysis methods, a chapter of this thesis is dedicated to the work made on a turbulence energy profile extraction and its application on the INTENSE instrument. Conclusions and perspectives of the work made during this thesis are presented at the end of the document

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Gallagher, Joseph. "Adaptive optics for fluorescence correlation spectroscopy." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY054/document.

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Ce projet de recherche conjugue deux aspects complémentaires : le développement d’un montage de microscopie intégrant un système d'Optique Adaptative (OA) et l’étude de masses cancéreuses (Sphéroïdes Multicellulaires) sous pression mécanique.Ces deux axes seront mutuellement bénéfiques puisque l’implémentation de l’OA rendra possible l’imagerie et les mesures physiques au sein des sphéroïdes ; d’un autre côté, l’étude des sphéroïdes permettra de caractériser les aberrations induites par ce type d’échantillons et de mieux comprendre les exigences sur le système d’OA qu’imposent l’observation de ces échantillons ainsi que les limites de la microscopie optique dans les tissus biologiques
This research project combines two complementary aspects: the development of an assembly incorporating an Adaptive Optics microscope system and the study of cancerous masses (multicellular spheroids) under mechanical pressure.These two axes are mutually beneficial since the implementation of the adaptive optics will enable imaging and physical measurements in spheroids; On the other hand, the study of spheroids will characterize the aberrations induced by this type of samples and understand the requirements of the adaptive optics system imposed by the observation of these samples as well as the limits of optical microscopy in biological tissues

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Bierent, Rudolph. "Optique adaptative appliquée aux télécommunications laser en espace libre." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4356/document.

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Les télécommunications laser en espace libre sont limitées en portée par la turbulence atmosphérique. L'optique adaptative, par la correction de la phase turbulente à l'émission du faisceau, a permis d'étendre leur domaine d'exploitation.Toutefois, sur de longues distances de propagation, cette correction n'est plus suffisante et il faut également précompenser l'amplitude du faisceau émis. De premières études numériques ont montré que le principe de retournement temporel, ou plus exactement de conjugaison de phase bidirectionnelle itérative, conduirait à des conditions satisfaisantes de focalisation du faisceau laser en fort régime de turbulence.Le principe de conjugaison de phase n'ayant été étudié que théoriquement jusque-là, mon travail de thèse s'est attaché à mettre en oeuvre un démonstrateur expérimental pour quantifier les performances de cette technique dans des conditions maîtrisées. En parallèle, une simulation de bout en bout de l'expérience a permis d'évaluer l'influence d'erreurs d'étalonnage sur les performances finales de la correction et de valider les résultats expérimentaux obtenus. Les points durs de la mise en oeuvre d'un système de télécommunications laser en espace libre ont ainsi été identifiés.L'ensemble de ces travaux constitue la toute première démonstration expérimentale du principe de retournement temporel optique. D'autres domaines d'application comme les lasers de puissance ou la propagation à travers des milieux biologiques très diffusants, nécessitant également de corriger le faisceau à l'émission, sont concernés
Free Space Optical communications (FSO) are range limited due to atmospheric turbulence. Adaptive optics can mitigate turbulence effects by adding a phase modulation on the emitted laser beam. However, both phase and amplitude modulation are needed to perform long range FSO. Previous numerical studies have shown that iterative phase conjugation is an efficient modulation technique for lasercom systems.This PhD thesis is dedicated to the development and the realization of the first experimental demonstration of the iterative phase conjugation principle in a controlled turbulence environment. An optical bench, representative of a long range propagation through strong turbulence, has been scaled down to few-meters propagation in visible.Several methods for complex field measurement and modulation are numerically studied. Selected methods are implemented and tested, such as a novel focal plane technique for complex field measurement. Finally, iterative phase conjugation is performed and results cross-correlated with an end-to-end model representative of the optical bench.This work is the first experimental demonstration of the optical phase conjugation principle. Applications can be found in other fields than lasercoms, such as high power lasers or propagation through highly diffusing biological tissues, both in need of laser emission modulation

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Jarosz, Jessica. "Vers la conception d'un système d'optique adaptative pour la photocoagulation laser de la rétine." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066649/document.

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L’impact laser obtenu avec les systèmes actuels de photocoagulation laser de la rétine n’est pas maitrisé. L’enjeu est d'obtenir un confinement 3D de l'impact laser, c’est-à-dire de contrôler son positionnement et son extension, pour éviter de porter atteinte aux couches saines de la rétine. Un tel confinement pourrait être réalisé si l’on disposait d’un système laser plus ouvert et d’un dispositif permettant de corriger en temps réel les aberrations de l'œil. L’optique adaptative permet une telle correction ; cette technique est utilisée depuis une vingtaine d’années dans le domaine du diagnostic (imagerie). Cependant, sa mise en œuvre pour des applications thérapeutiques, telles que la photocoagulation laser, nécessite encore d’en améliorer la robustesse : alors qu’en imagerie il suffit de reprendre une image si la précédente est mauvaise, le confinement de l’impact laser doit être assuré en permanence durant toute la procédure chirurgicale. Le but de la thèse est de guider le développement ultérieur d’un système d’optique adaptative médical visant à assister un système de photocoagulation laser de la rétine. Le dimensionnement d’un tel système doit s’appuyer sur une solide connaissance des aberrations oculaires. Ainsi, une étude hautement résolue temporellement et spatialement des aberrations dynamiques de l’œil de grande ampleur a été réalisée et de cette étude, des conclusions sur le dimensionnement d’un système d’optique adaptative pour l’œil ont été tirées. Par ailleurs, un banc de test d’optique adaptative haute cadence a été conçu et intégré pour se confronter aux problèmes pratiques que pose la mise en place d’un système d’optique adaptative pour l’œil
The laser lesion delivered by current retinal photocoagulation laser systems is not well controlled. The issue is to get a better confinement of the laser lesion that is to control the size of the laser lesion as well as the laser lesion positioning in the retina, in order to prevent any retinal damage. Such a confinement could be reached if the laser system featured a higher numerical aperture and was associated with a real-time correction of the aberrations of the eye. Adaptive optics gives access to such a correction; this technique has been used for the past twenty years for diagnosis (retinal imaging). However, further work is still to be achieved to improve the robustness of current adaptive optics systems before implementing adaptive optics in therapeutic systems, in particular in retinal laser photocoagulation systems. Indeed, unlike imaging where the acquisition can be repeated as many times as necessary, the confinement of the laser lesion must be maintained over time during the whole laser treatment. In this thesis, we provide guidance for the future design of an adaptive optics system for retinal photocoagulation. Such a design has to rely on a thorough knowledge of the ocular aberrations to correct. Thus, a highly temporally as well as spatially resolved aberrometry study on a large population was performed and conclusions on the design of an adaptive optics system for the eye were drawn from this study. Besides, a test bench was designed and set up to face the practical problems coming with the implementation of an adaptive optics system for the eye

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Héritier-Salama, Cédric Taïssir. "Innovative calibration strategies for large adaptive telescopes with pyramid wave-front sensors." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0371.

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Le développement des futurs télescopes géants (ELT) va révolutionner l’observation depuis le sol avec des diamètres allant jusqu’à 39 m. Pour exploiter pleinement leur potentiel scientifique, il sera nécessaire de les équiper de systèmes d’optique adaptative (OA) qui nécessiteront des étalonnages précis avant et pendant les opérations. Le design de ces télescopes et la complexité de l’analyseur pyramide (PWFS) demandent de repenser et d’optimiser ces stratégies d’étalonnages. Nous proposons d’utiliser des modèles pseudo-synthétiques pour générer numériquement les données d’étalonnage, en identifiant les paramètres clés du modèle à partir de données expérimentales. Dans cette thèse, je présente le développement et la validation expérimentale d’un tel modèle pseudo-synthétique pour les systèmes d’OA du large binocular telescope avec PWFS. En complément de ces premiers travaux, j’ai étudié différentes stratégies permettant un suivi des paramètres du modèle durant les opérations
The ground-based observation is at the edge of a breakthrough with the development of the extremely large telescopes. To benefit from the full scientific potential of theses telescopes, the instruments will rely on complex adaptive optics (AO) systems that will require a fine-tuning before and during the operation. The design of the telescopes and the complexity of the pyramid wavefront sensor (PWSF) demands to completely rethink and optimize the AO calibration procedures. We propose to use pseudo synthetic models of the AO system to generate numerically the calibration data, identifying the key-parameters of the model from experimental inputs. In this thesis, I introduce the development and experimental validation of such a pseudo synthetic model for the AO systems of the large binocular telescope with PWFS. Complementary to this first research, I investigated different strategies to provide tracking capabilities of the model parameters during the operations

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Errera, Marie-Hélène. "Etude des mécanismes immunitaires des uvéites idiopathiques par une approche biologique et l'optique adaptative." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066714/document.

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La majorité des modèles d’uvéites expérimentales sont médiées par les sous-types lymphocytaires CD4+ T-Helper 1 (Th1) et Th17. Le but de cette thèse est d’étudier les mécanismes immunitaires mis en jeu lors d’une uvéite idiopathique (sans étiologie) chez l’humain. La première partie de cette étude est donc consacrée à l’étude du profil biologique de 30 cytokines/chimiokines/ facteurs de croissance intraoculaires (AqH) et sériques obtenues au laboratoire (technologie Luminex®). Ces médiateurs sont dosés dans le sérum et l’AqH de patients atteints d’uvéites intermédiaires et postérieures activesidiopathiques. Ces résultats sont comparés à une cohorte de patients non inflammatoires et à des groupes de patients atteints d’uvéites de diverses étiologies. Nous avons trouvé que le profil des médiateurs diffère nettement en fonction de la cause de l’inflammation intraoculaire. Une réponse pro-inflammatoire large est observée avec des concentrations accrues des cytokines de type Th1 (IFNγ, IL-12), Th17 (IL-17), TNF-α, IL-6, MIP-1α, MIP-1β, MCP-1, G-CSF et IP-10 dans les uvéites idiopathiques. Les concentrations sériques différent de celles des contrôles par les taux d’IL-17 et IP-10 augmentés. La deuxième partie concerne l’étude des mécanismes immunitaires des uvéites par l’analyse des vascularites en imagerie adaptative (FIOA) et particulièrement l’observation anatomique des modifications liées aux inflammations oculaires. Nous ne trouvons pas de corrélation entre l’aspect de cellularité périvasculaire en FIOA et les cytokines retrouvées dans l’AqH des yeux avec uvéite. Pouvoir déterminer quels médiateurs de l’inflammation interviennent dans les pathologies inflammatoires permettrait de les cibler avec des thérapies adaptées
Most of experimental models of uveitis are mediated by lymphocytic subtypes CD4+ T-Helper 1 (Th1) et Th17. The aim of this thesis is to study the immune mechanisms in idiopathic uveitis (i.e. unknown etiology) in humans. First, we will determine the biological spectrum of 30 cytokines/ chemokines/ growth factors in aqueous humour and sera by Luminex® technology. Those mediators will be measured in the serum and aqueous humour of patients with active intermediate and posterior uveitis classified as idiopathic. Those results will be compared to a cohort of patients with no inflammation and to patients with uveitis of various causes. We found that the profile of mediators changes regarding to the cause of the intraocular inflammation. The proinflammatory process is related to increased levels of cytokines Th1 (IFNγ, IL-12), Th17 (IL-17), TNF-α, IL-6, MIP-1α, MIP-1β, MCP-1, G-CSF and IP-10 idiopathic uveitis. The sera of the patients with idiopathic uveitis have increased levels IL-17 and IP-10. Secondly, the immune mechanisms of uveitis were studied by adaptive optics imaging (FIOA) and particularly the observation of anatomic changes related to ocular inflammations. We ruled out any correlation betweeen the perivascular cellular opacification in FIOA and the cytokines/ chemokines found in the eyes with uveitis. An understanding of the profile of mediators in inflammation and their determination could help to target idiopathic uveitis with correct therapies

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Vargas, Martín Fernando. "Óptica adaptativa en oftalmoscopia: corrección de las aberraciones del ojo mediante un modulador espacial de cristal." Doctoral thesis, Universidad de Murcia, 1999. http://hdl.handle.net/10803/10846.

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Las aberraciones ópticas determinan la formación de imágenes en el ojo, tanto en el proceso de la visión como en las observaciones oftalmoscópicas del fondo de ojo. La corrección total de estas aberraciones permitiría una resolución limitada sólo por la difracción en las pupilas utilizadas. Las aberraciones del ojo difieren de un sujeto a otro y no responden a modelos sencillos. En este trabajo se propone el uso de técnicas de Óptica Adaptativa para el desarrollo de un sistema experimental para la medida y corrección de las aberraciones estáticas del ojo. Estas técnicas pueden ser igualmente útiles para obtener imágenes de alta resolución de la retina, utilizarse en el diseño de lentes oftálmicas, etc. Para la medida de la función aberración de onda, se han utilizado dos métodos no invasivos aplicables al ojo humano: La Recuperación de Fase a partir de dos imágenes de Doble Paso, y el Sensor de Hartmann-Shack. Para la corrección de la aberración se ha utilizado un Modulador Espacial de Cristal Líquido.Se han desarrollado los procedimientos de control y de calibrado de estos métodos, y se estudia la viabilidad de aplicación para el ojo. Finalmente, se han realizado medidas de la aberración, mediante ambos métodos, y su posterior corrección mediante el modulador espacial de cristal líquido, en un ojo artificial y en sujetos reales.
The image formation properties of the eye are determined by the aberrations of the optics. The complete correction of the aberrations would allow diffraction-limited resolution. The aberrations of the eye are not easily modeled and are different for each subject.This thesis proposes the use of adaptive optics techniques to measure and correct the static aberrations of the eye. The principles and methods developed are useful in specific applications, i.e., high-resolution retinal imaging, ophthalmic lens design, etc.Two non-invasive methods have been used to measure the wave aberration function: Phase Retrieval Techniques from two double-pass retinal images; and the Hartmann-Shack sensor. A Liquid Crystal Spatial Light Modulator was used to adaptively correct the wave front aberration of the eye.This thesis also includes guidelines to calibrate and control the proposed techniques.Finally, experimental explorations of these methods are reported. Several results are presented, including the measure and the subsequent compensation of the wave aberration for artificial and human eyes.

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Kasprzack, Marie. "Thermally Deformable Mirrors : a new Adaptive Optics scheme for Advanced Gravitational Wave Interferometers." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112252/document.

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L’objectif de la thèse est de développer une nouvelle technique d’optique adaptive pour les interferomètres gravitationels avancés, basée sur un nouveau type de miroir pour le faisceau d’injection de l’interferomètre. Le miroir déformable, basé sur une actuation thermique, doit etre un outil compatible ultra-vide, qui fonctionne sans bruit électronique ou mécanique, bon marché et permettre la correction des modes d’ordre supérieurs afin d’améliorer le matching des faisceaux de haute puissance dans les cavités laser du détecteur sous ultra-vide. Un montage experimental de caractérisation du miroir déformable a été mis en place afin d’effectuer les tests de validation du premier prototype sous air. L’élaboration d’une procédure de caractérisation des propriétés du miroir et d’une boucle de controle a permis de développer une approche efficace pour déterminer les possibilités et les limites du miroir. Nous avons ainsi pu faire la démonstration de sa capacite a corriger les aberrations de phase d’un faisceau laser infrarouge a différentes fréquences spatiales. Nous avons également démontré que le miroir vérifie les performances de stabilité, de reproductibilité et de linearité attendues. Nous avons ensuite validé l’amélioration du mode matching d’un faisceau laser sur une cavité de réference par le miroir thermiquement déformable
In this thesis we develop a new technique of adaptive optics for the Advanced Gravitational Interferometers, based on a new type of deformable mirror for the injection beam of the interferometer. This deformable mirror, based on a thermal actuation, has to be a high vacuum compatible and low-cost device, that is working without any electronic or mechanic noise. It has to allow the correction of high order modes to improve the matching of high power laser beams in the interferometer.An experimental setup has been made to characterize the first prototype on air. An efficient process and a control loop have allowed to determine the possibilities and limits of the device. We have demonstrated its ability to correct high order modes of an infrared laser beam. Afterwards, we have validated the improvement of mode matching into a fixed cavity

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Voyez, Juliette. "Mesures optiques de profils de turbulence atmosphérique pour les futurs systèmes d'optique adaptative." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00975076.

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L'optique adaptative classique est limitée par l'anisoplanétisme. Pour remédier à cette limitation, de nouveaux concepts, appelés optiques adaptatives grand champ, ont été développés. Ces systèmes analysent la turbulence atmosphérique dans le volume, ce qui accroît le champ de correction. Ces techniques requièrent une connaissance précise du profil de Cn2. Mon étude consiste à valider sur le ciel une nouvelle technique de mesure du profil de Cn2, appelée CO-SLIDAR, à partir des corrélations des mesures de pentes et de scintillation réalisées avec un analyseur Shack-Hartmann sur étoile binaire. Elle s'organise autour de deux grands axes. On réalise d'abord une simulation bout-en-bout de la reconstruction du profil de Cn2 dans un cas concret d'observation astronomique. On peut ainsi étudier l'impact des différentes sources d'erreur sur la reconstruction du profil de Cn2. Ceci nous permet d'améliorer la procédure d'estimation du profil de Cn2, en prenant en compte les bruits de détection. La deuxième partie de mon étude se consacre à la validation expérimentale. On dimensionne et caractérise en laboratoire un banc d'acquisition, le banc ProMeO. Ceci conduit à une bonne connaissance du fonctionnement du banc et nous permet de corriger certains effets instrumentaux. Le banc ProMeO est finalement couplé au télescope MeO de 1,5 m de diamètre. Les données acquises permettent une reconstruction du profil de Cn2, du sol jusqu'à 17 km, avec une résolution de 600 m. Les profils obtenus par la méthode CO-SLIDAR sont comparés avec succès à des profils issus de données météorologiques. L'ensemble de ces travaux constitue la première validation sur le ciel de la méthode CO-SLIDAR.

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Книги з теми "Adaptative optics"

Dessenne, Caroline. Commande modale et pred́ictive en optique adaptative. Chatillon: ONERA, 1998.

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UMAP 2010 (2010 Hawaii Island, Hawaii). User modeling, adaptation, and personalization: 18th international conference, UMAP 2010, Big Islang, HI, USA, June 20-24, 2010 : proceedings. Berlin: Springer, 2010.

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Doncieux, Stéphane. From Animals to Animats 11: 11th International Conference on Simulation of Adaptive Behavior, SAB 2010, Paris - Clos Lucé, France, August 25-28, 2010. Proceedings. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2010.

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Webster, Michael A. Blur Adaptation and Induction. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0110.

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The image on the retina is always blurred because of optical aberrations of the eye. Yet typically the world does not “look” blurred, and although the acuity of the eye varies dramatically from the center of gaze to the periphery, the outside world generally “feels” focused throughout the visual field. This perception of focus is one of many illusions where the brain appears unaware of its own imperfections. The perceived focus of an image can be strongly biased by prior adaptation to a blurred or sharpened image or by simultaneous contrast from a blurred or sharpened surround. Adaptation to blur can selectively adjust to the patterns of blur introduced by different optical aberrations and may reflect adjustments that help compensate spatial perception for the optical and neural sensitivity limits of the visual system.

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Fenner, Christopher Smith. Vision: Its Optical Defects And The Adaptation Of Spectacles. Kessinger Publishing, LLC, 2007.

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Fenner, Christopher Smith. Vision: Its Optical Defects And The Adaptation Of Spectacles. Kessinger Publishing, LLC, 2007.

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Termeer, Catrien, Arwin van Buuren, Art Dewulf, Dave Huitema, Heleen Mees, Sander Meijerink, and Marleen van Rijswick. Governance Arrangements for Adaptation to Climate Change. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.600.

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Adaptation to climate change is not only a technical issue; above all, it is a matter of governance. Governance is more than government and includes the totality of interactions in which public as well as private actors participate, aiming to solve societal problems. Adaptation governance poses some specific, demanding challenges, such as the context of institutional fragmentation, as climate change involves almost all policy domains and governance levels; the persistent uncertainties about the nature and scale of risks and proposed solutions; and the need to make short-term policies based on long-term projections. Furthermore, adaptation is an emerging policy field with, at least for the time being, only weakly defined ambitions, responsibilities, procedures, routines, and solutions. Many scholars have already shown that complex problems, such as adaptation to climate change, cannot be solved in a straightforward way with actions taken by a hierarchic or monocentric form of governance. This raises the question of how to develop governance arrangements that contribute to realizing adaptation options and increasing the adaptive capacity of society. A series of seven basic elements have to be addressed in designing climate adaptation governance arrangements: the framing of the problem, the level(s) at which to act, the alignment across sectoral boundaries, the timing of the policies, the selection of policy instruments, the organization of the science-policy interface, and the most appropriate form of leadership. For each of these elements, this chapter suggests some tentative design principles. In addition to effectiveness and legitimacy, resilience is an important criterion for evaluating these arrangements. The development of governance arrangements is always context- and time-specific, and constrained by the formal and informal rules of existing institutions.

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Stokes, Chris, and Mark Howden, eds. Adapting Agriculture to Climate Change. CSIRO Publishing, 2010. http://dx.doi.org/10.1071/9780643098084.

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Adapting Agriculture to Climate Change is a fundamental resource for primary industry professionals, land managers, policy makers, researchers and students involved in preparing Australia’s primary industries for the challenges and opportunities of climate change. More than 30 authors have contributed to this book, which moves beyond describing the causes and consequences of climate change to providing options for people to work towards adaptation action. Climate change implications and adaptation options are given for the key Australian primary industries of horticulture, forestry, grains, rice, sugarcane, cotton, viticulture, broadacre grazing, intensive livestock industries, marine fisheries, and aquaculture and water resources. Case studies demonstrate the options for each industry. Adapting Agriculture to Climate Change summarises updated climate change scenarios for Australia with the latest climate science. It includes chapters on socio-economic and institutional considerations for adapting to climate change, greenhouse gas emissions sources and sinks, as well as risks and priorities for the future.

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Observatory, Smithsonian Astrophysical, and United States. National Aeronautics and Space Administration., eds. Astrophysical adaptation of points, the precision optical interferometer in space: Grant NAGW-4768 : final report for the period 1 July 1995 through 30 June 1996. Cambridge, Mass: Smithsonian Institution, Astrophysical Observatory, 1996.

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Baba, Kenshi, Masahiro Matsuura, Taiko Kudo, Shigeru Watanabe, Shun Kawakubo, Akiko Chujo, Hiroharu Tanaka, and Mitsuru Tanaka. Climate Change Adaptation Strategies of Local Governments in Japan. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.597.

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The latest climate change adaptation strategies adopted by local governments in Japan are discussed. A nationwide survey demonstrates several significant findings. While some prefectures and major cities have already begun to prepare adaptation strategies, most municipalities have yet to consider such strategies. This gap must be considered when studying the climate adaptation strategies of local governments in Japan, as municipal governments are crucial to the implementation of climate adaptation strategies due to high diversity in climate impacts and geographical conditions among municipalities within each prefecture in Japan. Key challenges for local governments in preparing adaptation strategies are the lack of expert knowledge and experience in the field of climate change adaptation, and compartmentalization of government bureaus. To address these issues, an interview study of six model prefectures in the SI-CAT (Social Implementation Program on Climate Change Adaptation Technology) project by the MEXT (Ministry of Education, Culture, Sports, Science and Technology) was conducted in order to understand the details of challenges raised by adaptation among local governments in Japan. The survey results reveal that local government officials lack information regarding impact projections and tools for evaluating policy options, even though some of them recognize some of the impacts of climate change on rice crop, vegetable, and fruit production. In addition, different bureaus, such as agriculture, public health, and disaster prevention, focus on different outcomes of climate change due to their different missions. As this is the inherent nature of bureaucratic organizations, a new approach for encouraging collaboration among them is needed. The fact that most of the local governments in Japan have not yet assessed the local impacts of climate change, an effort that would lay the groundwork for preparing adaptation strategies, suggests the importance of cyclical co-design that facilitates the relationship between climatic technology such as climate models and impact assessment and local governments’ needs so that the technology developments clarify the needs of local government, while those needs in turn nurture the seeds of technology.

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Частини книг з теми "Adaptative optics"

Schaeffel, Frank. "Contrast adaptation." In Handbook of Visual Optics, 325–60. Names: Artal, Pablo, editor. Title: Handbook of visual optics / [edited by] Pablo Artal. Description: Boca Raton : Taylor & Francis, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315373027-21.

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Webster, Michael A., and Susana Marcos. "Neural adaptation to blur." In Handbook of Visual Optics, 307–20. Names: Artal, Pablo, editor. Title: Handbook of visual optics / [edited by] Pablo Artal. Description: Boca Raton : Taylor & Francis, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315373027-20.

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Maliva, Robert. "Adaptation Options." In Springer Hydrogeology, 215–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66813-6_10.

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Zalevsky, Zeev, and David Mendlovic. "Complex Adaptation." In Springer Series in Optical Sciences, 97–182. New York, NY: Springer New York, 2004. http://dx.doi.org/10.1007/978-0-387-34715-8_5.

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Li, Shujun, and Mieczyslaw M. Kokar. "Signaling Options." In Flexible Adaptation in Cognitive Radios, 29–35. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-0968-7_4.

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Fischer-Hirchert, Ulrich H. P. "Optical Mode-field Adaptation." In Photonic Packaging Sourcebook, 57–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-25376-8_3.

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Bjørnø, Leif. "Adaptation of Fiber Optics to Hydrophone Applications." In Adaptive Methods in Underwater Acoustics, 629–41. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5361-1_54.

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Nilubon, Polpat. "Decision tree method for evaluating the flexibility of flood risk adaptation options." In Opportunistic Adaptation, 85–100. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003197874-5.

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Benioff, Ron, Sandra Guill, and Jeffrey Lee. "Assessment of Adaptation Policy Options." In Environmental Science and Technology Library, 181–88. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0303-6_7.

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Stelzer, Volker, and Adriana Quintero. "Climate Change Impacts on the Energy Sector and Adaptation Options." In Climate Adaptation Santiago, 81–105. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-39103-3_5.

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Тези доповідей конференцій з теми "Adaptative optics"

Santiago-Alvarado, A., S. Vázquez-Montiel, J. González-García, V. M. García-Luna, A. Fernández-Moreno, and E. Vera-Díaz. "Analysis and design of an adaptative lens." In SPIE Optics + Photonics, edited by Pantazis Z. Mouroulis, Warren J. Smith, and R. Barry Johnson. SPIE, 2006. http://dx.doi.org/10.1117/12.679720.

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Diaz-Ramirez, Victor H., Vitaly Kober, and Josue Alvarez-Borrego. "Real-time pattern recognition with adaptative correlation filters." In Optics & Photonics 2005, edited by Andrew G. Tescher. SPIE, 2005. http://dx.doi.org/10.1117/12.617815.

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Coste, F., R. Fabbro, D. Douay, L. Sabatier, and D. Lacote. "Auto adaptative laser welding." In ICALEO® ‘96: Proceedings of the Lasers and Electro-Optics for Automotive Manufacturing Conference. Laser Institute of America, 1996. http://dx.doi.org/10.2351/1.5059106.

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Bernas, Tytus, Elikplimi K. Asem, J. Paul Robinson, and Bartek Rajwa. "Adaptative, signal-preserving compression of microscopic images using noise modeling in the wavelet domain and JPEG2000 coding." In Biomedical Optics 2006, edited by Daniel L. Farkas, Dan V. Nicolau, and Robert C. Leif. SPIE, 2006. http://dx.doi.org/10.1117/12.647701.

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Kimball, Mark. "Deterministic Polishing Applications in Failure Analysis." In ISTFA 2009. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.istfa2009p0130.

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Abstract Development of a reliable mechanical decapsulation procedure for an IC process incorporating Cu and organic passivation layers resulted in a better understanding of the polishing process. The improved polishing technique --Deterministic Polishing-- is an adaptation of an advanced polishing technology employed by the optics industry to fabricate highly accurate optical elements. These results can be applied to a broad class of polishing applications.

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Nott, Phil, John McNab, Upul Fernando, and Terry Sheldrake. "The Development of a Fibre-Optic Based Breach Detection System for Flexible Pipe." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11202.

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In service, flexible pipes are exposed to harsh environments and challenging conditions that subject the structure to demanding physical rigour that is largely unknown or unnoticed throughout the service life of the asset. Resistance to extremes and large fluctuations in strain, temperature and pressure are built into the pipe design, however the pipes are often breached due to accidental damage to the outer shield caused by external objects. Early knowledge of this damage is vital to limit the degradation of the metallic wires due to contact with seawater, and with the early knowledge of breach prompt remedial actions can be triggered to prevent further deterioration of the pipe that may lead to expensive repair or replacement. Using fibre optics as a distributed temperature sensor, the entire length of the asset can be continuously monitored, and the incidence of a breach in the outer shield of the pipe can be efficiently captured. This paper describes a fibre optic-based breach detection system developed to monitor offshore flexible pipes. A brief outline of the development programme is presented. The work involved selection of fibre/monitoring equipment, physical encasement of the ‘harsh environment’ fibre optics in the pipe structure, subsequent termination in the pipe end-fitting, and the procedures for interrogation and interpretation of the Raman-based optical signals. A prototype system has been implemented on mid-scale pipe samples and the transient and steady state thermal behaviour of the pipe has been investigated under a simulated and wide range of controlled breach test conditions. A summary of the test results is presented. Numerical models of the pipe geometry have been developed to predict the transient thermal behaviour of a shield breach. Good correlation of experimental results with the predictions shows the sound adaptation of fibre optic-based sensing technology in offshore flexible pipes.

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Leopold, Klaus, Dietmar Jannach, and Hermann Hellwagner. "Knowledge-based media adaptation." In Optics East, edited by John R. Smith, Tong Zhang, and Sethuraman Panchanathan. SPIE, 2004. http://dx.doi.org/10.1117/12.577420.

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Kang, Jung Won, Jae-Gon Kim, Dong-San Jun, and Jin-Woo Hong. "MPEG-21 DIA-based video adaptation framework and its application to rate adaptation." In Optics & Photonics 2005, edited by Andrew G. Tescher. SPIE, 2005. http://dx.doi.org/10.1117/12.623716.

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Yu, Xin, Dazun Zhao, and Li Chen. "Adaptation of adaptive optics systems." In Optical Science, Engineering and Instrumentation '97, edited by Robert K. Tyson and Robert Q. Fugate. SPIE, 1997. http://dx.doi.org/10.1117/12.279053.

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Strinadko, Marina M., Katerina B. Timochko, and Olena V. Petruk. "Correlation method of biosystems adaptation research." In International Conference on Correlation Optics, edited by Oleg V. Angelsky. SPIE, 1999. http://dx.doi.org/10.1117/12.370456.

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Звіти організацій з теми "Adaptative optics"

Research Institute (IFPRI), International Food Policy. Climate change, agriculture, and adaptation options for Peru. Washington, DC: International Food Policy Research Institute, 2019. http://dx.doi.org/10.2499/p15738coll2.133213.

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Research Institute (IFPRI), International Food Policy. Climate change, agriculture, and adaptation options for Nicaragua. Washington, DC: International Food Policy Research Institute, 2019. http://dx.doi.org/10.2499/p15738coll2.133214.

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Research Institute (IFPRI), International Food Policy. Climate change, agriculture, and adaptation options for Honduras. Washington, DC: International Food Policy Research Institute, 2019. http://dx.doi.org/10.2499/p15738coll2.133215.

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Watkiss, Paul, Alistair Hunt, and Matthew Savage. Early value-for-money adaptation: Delivering VfM adaptation using iterative frameworks and low-regret options. Evidence on Demand, July 2014. http://dx.doi.org/10.12774/eod_cr.july2014.watkisspetal.

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Research Institute (IFPRI), International Food Policy. Climate change, agriculture, and adaptation options for Costa Rica. Washington, DC: International Food Policy Research Institute, 2019. http://dx.doi.org/10.2499/p15738coll2.133209.

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Peterson, David L., Connie I. Millar, Linda A. Joyce, Michael J. Furniss, Jessica E. Halofsky, Ronald P. Neilson, and Toni Lyn Morelli. Responding to climate change in national forests: a guidebook for developing adaptation options. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2011. http://dx.doi.org/10.2737/pnw-gtr-855.

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McNulty, Steven, Sarah Wiener, Emrys Treasure, Jennifer Moore Myers, Hamid Farahani, Lisa Fouladbash, David Marshall, and Rachel F. Steele. Southeast Regional Climate Hub Assessment of Climate Change Vulnerability and Adaptation and Mitigation Strategies. United States. Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7279978.ch.

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Анотація:

Climate-related variability in rainfall, temperature, and extreme weather (e.g., drought, flood, unseasonal frost) pose significant challenges to working land (i.e., range, forest, and agricultural) managers across the southeastern United States. This document outlines the type of risks that southeastern agriculture and forestry currently face and, in some cases, options to address these risks. Finally, this document looks forward to providing direction on the priority needs of Southeast working land managers and an outline of how the USDA Southeast Climate Hub will address those needs.

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Watkiss, Paul, Alistair Hunt, and Matthew Savage. Early VfM AdaptationToolkit: Delivering value-for-money adaptation with iterative frameworks & low-regret options. Evidence on Demand, July 2014. http://dx.doi.org/10.12774/eod_cr.july2014.watkisspetala.

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Dawson, Ian K., Sammy Carsan, Steve Franzel, Roeland Kindt, Paulo van Breugel, Lars Graudal, Jens-Peter B. Lillesø, Caleb Orwa, and Ramni Jamnadass. Agroforestry, livestock, fodder production and climate change adaptation and mitigation in East Africa: issues and options. World Agroforestry Centre (ICRAF), 2014. http://dx.doi.org/10.5716/wp14050.pdf.

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Tobin, Daniel, Erin Lane, and Ron Hoover. Climate Change and Agriculture in the Northeast: Teamwork, Responses, and Results. USDA Northeast Climate Hub, 2015. http://dx.doi.org/10.32747/2015.6965353.ch.

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Анотація:

Not everyone may agree on the best adaptation practices all the time, but as opposed to rigid guidelines, a whole suite of options are being developed that will allow individuals to pick and choose what best works for them. But being proactive in ways that have both an economic and environmental outlook will determine agriculture’s success in responding to changes in climate. With collaboration and cooperation, the northeast can meet the challenge to maintain and improve production. The biggest risk is not climate change itself; it is being passive as these changes occur.

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