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Littérature scientifique sur le sujet « Spatial scattering »

Auteur : Grafiati

Publié le 9 novembre 2024

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Articles de revues sur le sujet "Spatial scattering"

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Li, Qingqing, Kyeong Jin Kim, Shengzhen Ruan, Lei Yuan, Ling Yang et Jiliang Zhang. « Polarized Spatial Scattering Modulation ». IEEE Communications Letters 23, n^o 12 (décembre 2019) : 2252–56. http://dx.doi.org/10.1109/lcomm.2019.2943864.

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Li, Cai, Wenxi Cao et Yuezhong Yang. « Optical scattering property : spatial and angle variability in daya bay ». Chinese Optics Letters 10, S2 (2012) : S20101. http://dx.doi.org/10.3788/col201210.s20101.

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Jannson, Joanna, Emil Wolf et Tomasz Jannson. « Spatial coherence discrimination in scattering ». Optics Letters 13, n^o 12 (1 décembre 1988) : 1060. http://dx.doi.org/10.1364/ol.13.001060.

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Eriksson, Ronja, Per Gren, Mikael Sjödahl et Kerstin Ramser. « Investigation of the Spatial Generation of Stimulated Raman Scattering Using Computer Simulation and Experimentation ». Applied Spectroscopy 76, n^o 11 (24 octobre 2022) : 1307–16. http://dx.doi.org/10.1177/00037028221123593.

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Stimulated Raman scattering is a phenomenon with potential use in providing real-time molecular information in three-dimensions (3D) of a sample using imaging. For precise imaging, the knowledge about the spatial generation of stimulated Raman scattering is essential. To investigate the spatial behavior in an idealized case, computer simulations and experiments were performed. For the computer simulations, diffraction theory was used for the beam propagation complemented with nonlinear phase modulation describing the interaction between the light and matter. For the experiments, a volume of ethanol was illuminated by an expanded light beam and a plane inside the volume was imaged in transmission. For generating stimulated Raman scattering, a pump beam was focused into this volume and led to a beam dump after passing the volume. The pulse duration of the two beams were 6 ns and the pump beam energy ranged from 1 to 27 mJ. The effect of increasing pump power on the spatial distribution of the Raman gain and the spatial growth of the signal at different interaction lengths between the beam and the sample was investigated. The spatial width of the region where the stimulated Raman scattering signal was generated for experiments and simulation was 0.21 and 0.09 mm, respectively. The experimental and simulation results showed that most of the stimulated Raman scattering is generated close to the pump beam focus and the maximum peak of the Stokes intensity spatially comes shortly after the peak of the pump intensity.

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Shinohara, Yuya, et Yoshiyuki Amemiya. « Effect of finite spatial coherence length on small-angle scattering ». Journal of Applied Crystallography 48, n^o 6 (13 octobre 2015) : 1660–64. http://dx.doi.org/10.1107/s160057671501715x.

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This study shows that forward scattering at the origin of reciprocal space contributes to the scattering intensity profiles of ultra-small-angle scattering. The forward scattering corresponds to a Fourier transform of the X-ray coherent volume on a sample. This contribution is usually ignored in the study of small-angle scattering, while it is fully considered in the fields of X-ray imaging, such as coherent X-ray diffraction imaging and X-ray ptychography. This effect is explicitly illustrated in the context of small-angle scattering, and the effect of a finite spatial coherence length on small-angle scattering is discussed.

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Bian, Yaoxing, Hongyu Yuan, Junying Zhao, Dahe Liu, Wenping Gong et Zhaona Wang. « External Electric Field Tailored Spatial Coherence of Random Lasing ». Crystals 12, n^o 8 (18 août 2022) : 1160. http://dx.doi.org/10.3390/cryst12081160.

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In this study, spatial coherence tunable random lasing is proposed by designing a random laser with separate coupling configuration between the gain medium and the scattering part. By using the polymer dispersion liquid crystal (PDLC) film with tunable scattering coefficient for supplying random scattering feedback and output modification, red, green and blue random lasers are obtained. By applying or removing electric field to manipulate the scattering intensity of the PDLC film, intensity and spatial coherence of these random lasing are then switched between the high or low state. This work demonstrates that controlling the external scattering intensity is an effective method to manipulate the spatial coherence of random lasing.

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Pierrat, Romain, Rachid Elaloufi, Jean-Jacques Greffet et Rémi Carminati. « Spatial coherence in strongly scattering media ». Journal of the Optical Society of America A 22, n^o 11 (1 novembre 2005) : 2329. http://dx.doi.org/10.1364/josaa.22.002329.

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Andreev, Anatolii V., Yu A. Il'inskiĭ et A. S. Mkoyan. « Spatial evolution of cooperative Raman scattering ». Soviet Journal of Quantum Electronics 19, n^o 4 (30 avril 1989) : 488–90. http://dx.doi.org/10.1070/qe1989v019n04abeh007901.

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DONG, GUANGJIONG. « SPATIAL TUNING OF BOSE-EINSTEIN CONDENSATIONS ». International Journal of Modern Physics B 21, n^o 23n24 (30 septembre 2007) : 4265–70. http://dx.doi.org/10.1142/s0217979207045505.

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We briefly review our recent work on spatial tuning of Bose-Einstein condensation (BEC). We first study spatially periodic tuning of the s-wave scattering length for controlling the propagation of a BEC matter wave, and find matter wave limiting processing and bistability. Second, we show that a stable BEC with natural attractive interaction could be formed by tuning the s -wave scattering length with a Gaussian optical field, but the condensed atom number should be less than a critical value. Further, we apply Thomas-Fermi approximation to obtain a formula for this critical value.

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Wang, Liang, Gaokun Yu, Minshuai Liang, Yun Ren et Linhui Peng. « Experimental Measurement of Forward Scattering from Very Rough Sand Ripples in a Water Tank ». Remote Sensing 14, n^o 16 (9 août 2022) : 3865. http://dx.doi.org/10.3390/rs14163865.

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High order Bragg scattering from sand ripples is investigated by a tank experiment, where the artificially produced sand ripples have a spatial period of 0.2 m and ripple height of 5 cm. Bragg scattering has been measured at three frequencies 22 kHz, 24.57 kHz, and 27 kHz and three incident grazing angles 20∘, 30∘, 40∘ by a method based on the conventional beamforming using two horizontal receiving arrays. It is illustrated that high order Bragg scatterings can be observed, and the corresponding scattered grazing angles agree with the theoretical prediction. Owing to the ripple height being on the order of wavelength, it is found that the distribution of forward scattering amplitude is different from the distribution for sand ripples of small height, i.e., the diffuseness of scattering amplitude is increased with the ripple height.

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Thèses sur le sujet "Spatial scattering"

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Susanto, Raden Dwi 1963. « Spatial coherence and rough bottom scattering in shallow water ». Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36003.

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Lim, Dong Sung. « Phase singularities and spatial-temporal complexity in optical fibres ». Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/772.

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Morgan, Stephen P. « Continuous wave optical techniques for imaging through scattering media ». Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319966.

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Hirst, Edwin. « Airborne particle shape and size classification from spatial light scattering profiles ». Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332653.

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Ibison, Michael Craig. « Analytical studies of spatial and temporal confinement in stimulated Raman scattering ». Thesis, University of Southampton, 1987. https://eprints.soton.ac.uk/396458/.

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The work presented in this thesis is a description of theoretical techniques for spatial and temporal confinement in the small signal regime of Stimulated Raman Scattering with a pump laser beam. The aim of this work is to provide where possible a mathematical model for the effects of confinement on both the pump, and the Raman generated Stokes fields, whilst at the same time to give some idea of the tools available to the theoretician pursuing this end. Particular attention has been paid to the (existing) domains over which relatively simple mathematical models are applicable, and also to provide bounds on the applicability of both original and existing results. Both the Maxwell and Lagrange formulation of the (electromagnetic) propagation problem are developed in this work. The paraxial ray equation which arises from the former is investigated in some detail; results are presented which give the full set of refractive index variations for which this equation is separable (and therefore potentially soluble) under an arbitrary transformation. The Lagrange formulation is employed to solve the spatial confinement problem which may arise from the use of a waveguide or a focussed pump beam. The traditional Maxwell formulation is used to provide the solutions to the temporal confinement problem. Where possible, results are presented which combine the solutions from both domains to obtain a model for simultaneous spatial and temporal confinement.

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Ille, Jean-Francois. « Interaction of spatial scales in acoustic radiation from hemi-capped cylinders ». Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16091.

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Barton, John E. « Bioaerosol detection through simultaneous measurement of particle intrinsic fluorescence and spatial light scattering ». Thesis, University of Hertfordshire, 2005. http://hdl.handle.net/2299/14272.

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Interest in the role and detection of airborne biological micro-organisms has increased dramatically in recent years, in part through heightened fears of bioterrorism. Traditional bio-detection methods have generally slow response times and require the use of reagents. Conversely, techniques based on light scattering phenomena are reagent-free and are able to operate in real-time. Previous research has established that classification of certain types of airborne particles on the basis of shape and size may be achieved through the analysis of the spatial light scattering patterns produced by individual particles. Similarly, other research has shown that the intrinsic fluorescence of particles excited by radiation of an appropriate wavelength can be used to establish the presence of biological particles, provided background particles with similar fluorescence properties are not present. This is often not the case. This thesis, therefore, describes the design, development, and testing of a new type of bioaerosol detection instrument in which the advantages of both particle spatial light scattering analysis and intrinsic fluorescence are exploited. The instrument, referred to as the Mult- Parameter Aerosol Monitor (MPAM), is unique in simultaneously recording data relating to the size, shape, and fluorescence properties of individual airborne particles at rates up to several thousand particles per second. The MPAM uses a continuous-wave frequency quadrupled Nd: YVO4 laser to produce both spatial scattering and fluorescence data from particles carried in single-file through the laser beam. This use of a CW laser leads to opto-mechanical simplicity and reduces fluorescence bleaching effects. A custom-designed multi-pixel Hybrid Photodiode (HPD) detector is used to record the spatial scattering data in forward scattering plane whilst particle fluorescence is recorded via a large solid-angle ellipsoidal reflector and single photomultiplier detector. Calibration tests and experimental trials involving a range of both biological and nonbiological aerosols have shown that the MPAM, when supported by appropriate data analysis algorithms, is capable of achieving enhanced levels of discrimination between biological and non-biological particles down to the submicrometre sizes and, in some cases, enhanced discrimination between classes of biological particle.

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Bagschik, Kai [Verfasser], et Hans Peter [Akademischer Betreuer] Oepen. « Coherent soft X-ray magnetic scattering and spatial coherence determination / Kai Bagschik ; Betreuer : Hans Peter Oepen ». Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1143868986/34.

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Mounaix, Mickaël. « Matricial approaches for spatio-temporal control of light in multiple scattering media ». Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066562/document.

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L’imagerie optique à travers des milieux diffusants, comme des milieux biologiques ou de la peinture blanche, reste un challenge car l’information spatiale portée par la lumière incidente est mélangée par les évènements multiples de diffusion. Toutefois, les modulateurs spatiaux de lumière (SLM) disposent de millions de degrés de liberté pour contrôler le profil spatial de la lumière en sortie du milieu, en forme de tavelure (speckle), avec des techniques de modulation du front d’onde. Cependant, si le laser génère une impulsion brève, le signal transmis s’allonge temporellement, car le milieu diffusant répond différemment pour les diverses composantes spectrales de l’impulsion. Nous avons développé, au cours de cette thèse, des méthodes de contrôle du profil spatiotemporel d’une impulsion brève transmise à travers un milieu diffusant. En mesurant la Matrice de Transmission Multi-Spectrale ou Résolue-Temporellement, la propagation de l’impulsion peut être totalement décrite dans le domaine spectral ou temporel. Avec des techniques de manipulation du front d’onde, les degrés de libertés spectraux/temporel peuvent être ajustés avec un unique SLM via la diversité spectrale du milieu diffusant. Nous avons démontré, de manière déterministe, la focalisation spatio-temporelle d’une impulsion brève après propagation dans un milieu diffusant, avec une compression temporelle proche de la durée initiale de l’impulsion, à différentes positions de l’espace-temps. Nous avons également démontré un façonnage contrôlé du profil temporel de l’impulsion, notamment avec la génération d’impulsions doubles. Nous exploitons cette focalisation spatio-temporelle pour exciter un processus optique non-linéaire, la fluorescence à deux photons. Cette approche ouvre des perspectives intéressantes pour le contrôle cohérent, l’étude de l’interaction lumière-matière ainsi que l’imagerie multi-photonique
Optical imaging through highly disordered media such as biological tissue or white paint remains a challenge as spatial information gets mixed because of multiple scattering. Nonetheless, spatial light modulators (SLM) offer millions of degrees of freedom to control the spatial speckle pattern at the output of a disordered medium with wavefront shaping techniques. However, if the laser generates a broadband ultrashort pulse, the transmitted signal becomes temporally broadened as the medium responds disparately for the different spectral components of the pulse. We have developed methods to control the spatio-temporal profile of the pulse at the output of a thick scattering medium. By measuring either the Multispectral or the Time- Resolved Transmission Matrix, we can fully describe the propagation of the broadband pulse either in the spectral or temporal domain. With wavefront shaping techniques, one can control both spatial and spectral/temporal degrees of freedom with a single SLM via the spectral diversity of the scattering medium. We have demonstrated deterministic spatio-temporal focusing of an ultrashort pulse of light after the medium, with a temporal compression almost to its initial time-width in different space-time position, as well as different temporal profile such as double pulses. We exploit this spatio-temporal focusing beam to enhance a non-linear process that is two-photon excitation. It opens interesting perspectives in coherent control, light-matter interactions and multiphotonic imaging

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Franchi, Gianni. « Machine learning spatial appliquée aux images multivariées et multimodales ». Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM071/document.

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Cette thèse porte sur la statistique spatiale multivariée et l’apprentissage appliqués aux images hyperspectrales et multimodales. Les thèmes suivants sont abordés :Fusion d'images :Le microscope électronique à balayage (MEB) permet d'acquérir des images à partir d'un échantillon donné en utilisant différentes modalités. Le but de ces études est d'analyser l’intérêt de la fusion de l'information pour améliorer les images acquises par MEB. Nous avons mis en œuvre différentes techniques de fusion de l'information des images, basées en particulier sur la théorie de la régression spatiale. Ces solutions ont été testées sur quelques jeux de données réelles et simulées.Classification spatiale des pixels d’images multivariées :Nous avons proposé une nouvelle approche pour la classification de pixels d’images multi/hyper-spectrales. Le but de cette technique est de représenter et de décrire de façon efficace les caractéristiques spatiales / spectrales de ces images. Ces descripteurs multi-échelle profond visent à représenter le contenu de l'image tout en tenant compte des invariances liées à la texture et à ses transformations géométriques.Réduction spatiale de dimensionnalité :Nous proposons une technique pour extraire l'espace des fonctions en utilisant l'analyse en composante morphologiques. Ainsi, pour ajouter de l'information spatiale et structurelle, nous avons utilisé les opérateurs de morphologie mathématique
This thesis focuses on multivariate spatial statistics and machine learning applied to hyperspectral and multimodal and images in remote sensing and scanning electron microscopy (SEM). In this thesis the following topics are considered:Fusion of images:SEM allows us to acquire images from a given sample using different modalities. The purpose of these studies is to analyze the interest of fusion of information to improve the multimodal SEM images acquisition. We have modeled and implemented various techniques of image fusion of information, based in particular on spatial regression theory. They have been assessed on various datasets.Spatial classification of multivariate image pixels:We have proposed a novel approach for pixel classification in multi/hyper-spectral images. The aim of this technique is to represent and efficiently describe the spatial/spectral features of multivariate images. These multi-scale deep descriptors aim at representing the content of the image while considering invariances related to the texture and to its geometric transformations.Spatial dimensionality reduction:We have developed a technique to extract a feature space using morphological principal component analysis. Indeed, in order to take into account the spatial and structural information we used mathematical morphology operators

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Livres sur le sujet "Spatial scattering"

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Karlsson, E. B. Scattering by entangled spatial degrees of freedom. Chilton : Rutherford Appleton Laboratory, 2001.

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Laboratory, Wave Propagation, dir. The longitudinal-transverse spatial coherence function for a spherical wave propagating through homogeneous atmospheric turbulence : Implications for RASS. Boulder, Colo : Wave Propagation Laboratory : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1991.

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Laboratory, Wave Propagation, dir. The longitudinal-transverse spatial coherence function for a spherical wave propagating through homogeneous atmospheric turbulence : Implications for RASS. Boulder, Colo : Wave Propagation Laboratory : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1991.

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Lataitis, R. J. The longitudinal-transverse spatial coherence function for a spherical wave propagating through homogeneous atmospheric turbulence : Implications for RASS. Boulder, Colo : Wave Propagation Laboratory : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1991.

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Laboratory, Wave Propagation, dir. The longitudinal-transverse spatial coherence function for a spherical wave propagating through homogeneous atmospheric turbulence : Implications for RASS. Boulder, Colo : Wave Propagation Laboratory : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1991.

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Laboratory, Wave Propagation, dir. The longitudinal-transverse spatial coherence function for a spherical wave propagating through homogeneous atmospheric turbulence : Implications for RASS. Boulder, Colo : Wave Propagation Laboratory : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1991.

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The longitudinal-transverse spatial coherence function for a spherical wave propagating through homogeneous atmospheric turbulence : Implications for RASS. Boulder, Colo : Wave Propagation Laboratory : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1991.

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8

Hayazawa, Norihiko, et Prabhat Verma. Nanoanalysis of materials using near-field Raman spectroscopy. Sous la direction de A. V. Narlikar et Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533053.013.10.

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This article describes the use of tip-enhanced near-field Raman spectroscopy for the characterization of materials at the nanoscale. Tip-enhanced near-field Raman spectroscopy utilizes a metal-coated sharp tip and is based on surface-enhanced Raman scattering (SERS). Instead of the large surface enhancement from the metallic surface in SERS, the sharp metal coated tip in the tip-enhanced Raman scattering (TERS) provides nanoscaled surface enhancement only from the sample molecules in the close vicinity of the tip-apex, making it a perfect technique for nanoanalysis of materials. This article focuses on near-field analysis of some semiconducting nanomaterials and some carbon nanostructures. It first considers SERS analysis of strained silicon and TERS analysis of epsilon-Si and GaN thin layers before explaining how to improve TERS sensitivity and control the polarization in detection for crystalline materials. It also discusses ways of improving the spatial resolution in TERS.

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Furst, Eric M., et Todd M. Squires. Interferometric tracking. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199655205.003.0006.

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The purpose of this chapter is to present a survey of passive microrheology techniques that are important complements to more widely used particle tracking and light scattering methods. Such methods include back focal plane interferometry and extensions of particle tracking to measure the rotation of colloidal particles. Methods of passive microrheology using back focal plane interferometry are presented, including the experimental design and detector sensitivity and limits in frequency bandwidth and spatial resolution. The Generalized Stokes Einstein relation is derived from linear response theory of the particle position power spectrum and complex susceptibility. Applications of interoferometric tracking include high frequency microrheology and two-point measurements. Lastly, the chapter includes a discussion of rotational passive microrheology and the rotational GSER.

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Horing, Norman J. Morgenstern. Retarded Green’s Functions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0005.

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Chapter 5 introduces single-particle retarded Green’s functions, which provide the probability amplitude that a particle created at (x, t) is later annihilated at (x′,t′). Partial Green’s functions, which represent the time development of one (or a few) state(s) that may be understood as localized but are in interaction with a continuum of states, are discussed and applied to chemisorption. Introductions are also made to the Dyson integral equation, T-matrix and the Dirac delta-function potential, with the latter applied to random impurity scattering. The retarded Green’s function in the presence of random impurity scattering is exhibited in the Born and self-consistent Born approximations, with application to Ando’s semi-elliptic density of states for the 2D Landau-quantized electron-impurity system. Important retarded Green’s functions and their methods of derivation are discussed. These include Green’s functions for electrons in magnetic fields in both three dimensions and two dimensions, also a Hamilton equation-of-motion method for the determination of Green’s functions with application to a 2D saddle potential in a time-dependent electric field. Moreover, separable Hamiltonians and their product Green’s functions are discussed with application to a one-dimensional superlattice in axial electric and magnetic fields. Green’s function matching/joining techniques are introduced and applied to spatially varying mass (heterostructures) and non-local electrostatics (surface plasmons).

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Chapitres de livres sur le sujet "Spatial scattering"

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Sheppard, Colin J. R. « Scattering and the Spatial Frequency Representation ». Dans Nanostructure Science and Technology, 61–92. Boston, MA : Springer US, 2007. http://dx.doi.org/10.1007/978-0-387-35659-4_3.

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Altman, C., et K. Suchy. « Generalization of the scattering theorem ». Dans Reciprocity, Spatial Mapping and Time Reversal in Electromagnetics, 83–113. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1530-1_3.

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Altman, C., et K. Suchy. « Generalization of the scattering theorem ». Dans Reciprocity, Spatial Mapping and Time Reversal in Electromagnetics, 90–121. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7915-5_4.

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Huebener, R. P., E. Held, W. Klein et W. Metzger. « Imaging of Spatial Structures with Ballistic Phonons ». Dans Phonon Scattering in Condensed Matter V, 305–8. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82912-3_88.

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Kuo, S. J., et M. G. Raymer. « Spatial Quantum Fluctuations in Stimulated Raman Scattering ». Dans Coherence and Quantum Optics VI, 627–30. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0847-8_115.

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Altman, C., et K. Suchy. « From scattering theorem to Lorentz reciprocity ». Dans Reciprocity, Spatial Mapping and Time Reversal in Electromagnetics, 151–74. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1530-1_5.

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Altman, C., et K. Suchy. « From scattering theorem to Lorentz reciprocity ». Dans Reciprocity, Spatial Mapping and Time Reversal in Electromagnetics, 160–84. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7915-5_6.

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Geernaert, Gerald L. « Temporal and Spatial Variability of the Wind Stress Vector ». Dans Radar Scattering from Modulated Wind Waves, 89–104. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2309-6_9.

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Thompson, A. Richard, James M. Moran et George W. Swenson. « Van Cittert–Zernike Theorem, Spatial Coherence, and Scattering ». Dans Astronomy and Astrophysics Library, 767–86. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44431-4_15.

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Bertolotti, M., M. Angelis, C. Sibilia et R. Horak. « Spatial Photon Correlation and Statistics of Nonlinear Processes in Nonlinear Waveguides ». Dans Light Scattering and Photon Correlation Spectroscopy, 231–46. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5586-1_19.

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Actes de conférences sur le sujet "Spatial scattering"

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Baboiu, D. M., R. Fuerst, B. Lawrence, W. E. Torruellas et G. I. Stegeman. « Spatial Modulational Instability in a Quadratic Medium : Theory and Experiment ». Dans Photon Correlation and Scattering. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/pcs.1996.sub.1.

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The stability of wave propagation has always been a major concern in nonlinear optics. The breakup of an intense monochromatic beam in a Kerr-type self-focusing medium was among the first nonlinear optical effects observed and is well-understood for third order nonlinear materials[1]. In geometries with two transverse dimensions, the nonlinear Schrodinger leads to catastrophic self-focusing (blow-up instability). Furthermore, one-dimensional solutions, when used in a geometry with two transverse dimensions, will also be subject to a large class of perturbations which lead to instabilities. Recently new origins for self-focusing effects have been observed in media with quadratic nonlinearities involving the strong coupling between a fundamental (FW) and a second harmonic (SH) beam.[2] The spatial instability properties of such a coupled two-beam system have not yet been investigated to date. Here we report a combined experimental and theoretical investigation of this phenomenon for quasi-one-dimensional beam inputs in a quadratic medium, KTP, near its phase-matching condition for second harmonic generation (SHG).

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2

Vicari, L. « Dielectric Behavior Of Polymer Dispersed Liquid Crystals ». Dans Spatial Light Modulators. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.stue.1.

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A Polymer Dispersed Liquid Crystal (PDLC) is a dispersion of liquid crystal microdroplets in a polymeric binder. Droplets are randomly oriented anisotropic spheres and, if their size is close to visible light wavelength, produce a strong light scattering so that the sample is translucent. Light scattering is due to the refractive index mismatch between droplets and surrounding polymer, and can be controlled by changing the droplets effective refractive index: this can be achieved in different manners, but usually it is easily obtained applying an external, low frequency, electric field. Possible applications range from large scale flexible displays to windows with controlled transparency or thermal sensors.In recent papers we have presented detailed experimental and theoretical studies of the behavior of a PDLC sample when a light beam impinges on it. Here we study the frequency dependence of light transmittance in a PDLC sample. To this aim we use a mathematical model assuming the liquid crystal dielectric permittivities ε|| and ε⊥ to be the most important parameters for the applied field frequency dependence of light transmittance. Theoretical results show a sudden decrease of the transmitted intensity increasing the frequency of the applied voltage. We present also preliminary experimental results confirming this behavior.

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3

Zachhuber, Bernhard, Christoph Gasser, Engelene t. H. Chrysostom et Bernhard Lendl. « Stand-off Spatial Offset Raman Scattering ». Dans Laser Applications to Chemical, Security and Environmental Analysis. Washington, D.C. : OSA, 2012. http://dx.doi.org/10.1364/lacsea.2012.lt2b.4.

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4

Teo, T. J., et J. M. Reid. « Spatial/Frequency Diversity in Inverse Scattering ». Dans IEEE 1985 Ultrasonics Symposium. IEEE, 1985. http://dx.doi.org/10.1109/ultsym.1985.198621.

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5

Yang, ChunPing, Jian Wu, Yong Han, XiuLan He et Jie Leng. « On the approximate model of scattering radiance for cloudless sky ». Dans Second International Conference on Spatial Information Technology, sous la direction de Cheng Wang, Shan Zhong et Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.773441.

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Bristow, Thomas C. « Surface Measurements and Frequency Analysis ». Dans Surface Roughness and Scattering. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/surs.1992.smb2.

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The measurement of surface roughness is typically an important parameter for describing the quality of fine finished parts. Examples include measurements of finely polished flat and curved optics, computer hard disks, semiconductor wafers and optical disks. Most often an RMS or RA roughness value is reported for the part, typically by the high spatial information. Other surface information can also be of interest, including mid-spatial roughness and figure information. Three basic surface profiles are generally used to define the surface, including total profile, waviness and roughness. A different approach is to examine the spatial information on the surface by using the power spectrum or the autocovariance function. Both of these functions can be calculated over any user selected spatial frequency region.

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7

Yang, Jin, Dong-mei Yan, Chao Wang et Hong Zhang. « Feature extraction of attributed scattering centers on high resolution SAR imagery ». Dans Second International Conference on Spatial Information Technology, sous la direction de Cheng Wang, Shan Zhong et Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.773984.

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8

Zhang, Lai, Alistair D. Bounds, James P. Fleming et John M. Girkin. « Monitoring of surgical wound healing using spatial frequency domain imaging ». Dans Biomedical Applications of Light Scattering XII, sous la direction de Adam Wax et Vadim Backman. SPIE, 2022. http://dx.doi.org/10.1117/12.2608558.

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Chen, Ping, Xing Cai, Jianxin Han et Tianlin Dong. « A simplified method for electromagnetic scattering from periodic surface of lossy media ». Dans Second International Conference on Spatial Information Technology, sous la direction de Cheng Wang, Shan Zhong et Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.774005.

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Huo, Chaoying, Zhihe Xiao, Hongmei Ren et Hongcheng Yin. « Quasi-dynamic electromagnetic scattering characteristic simulation and analysis of space satellite targets ». Dans Second International Conference on Spatial Information Technology, sous la direction de Cheng Wang, Shan Zhong et Jiaolong Wei. SPIE, 2007. http://dx.doi.org/10.1117/12.774186.

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Rapports d'organisations sur le sujet "Spatial scattering"

1

Cable, J. (Neutron scattering studies of spatial correlations in Fe-V and Fe-Cr alloys). Office of Scientific and Technical Information (OSTI), mai 1990. http://dx.doi.org/10.2172/6979180.

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2

Brower, K. L. Apparent spatial blurring and displacement of a point optical source due to cloud scattering. Office of Scientific and Technical Information (OSTI), septembre 1997. http://dx.doi.org/10.2172/534517.

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Wilson, D., Vladimir Ostashev et Max Krackow. Phase-modulated Rice model for statistical distributions of complex signals. Engineer Research and Development Center (U.S.), août 2023. http://dx.doi.org/10.21079/11681/47379.

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The basic Rice model is commonly used to describe complex signal statistics from randomly scattered waves. It correctly describes weak (Born) scattering, as well as fully saturated scattering, and smoothly interpolates between these extremes. However, the basic Rice model is unsuitable for situations involving scattering by random inhomogeneities spanning a broad range of spatial scales, as commonly occurs for sound scattering by turbulence in the atmospheric boundary layer and other scenarios. In such scenarios, the phase variations are often considerably stronger than those predicted by the basic Rice model. Therefore, the basic Rice model is extended to include a random modulation in the signal phase, which is attributable to the influence of the largest, most energetic inhomogeneities in the propagation medium. Various joint and marginal distributions for the complex signal statistics are derived to incorporate the phase-modulation effect. Approximations of the phase-modulated Rice model involving the Nakagami distribution for amplitude, and the wrapped normal and von Mises distributions for phase, are also developed and analyzed. The phase-modulated Rice model and various approximations are shown to greatly improve agreement with simulated data for sound propagation in the near-ground atmosphere.

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4

Toncy, Michael F., Joseph G. Cordon, Mahesh G. Samant, Gary L. Borges et Larry B. Sorensen. Surface X-Ray Scattering Measurements of the Substrate Induced Spatial Modulation of an Incommensurate Adsorbed Monolayer. Fort Belvoir, VA : Defense Technical Information Center, janvier 1991. http://dx.doi.org/10.21236/ada232625.

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Hayward, Jason, et Michael Moore. Neutron Scattering Instrumentation Research and Development for High Spatial and Temporal Resolution Imaging at Oak Ridge National Laboratory. Office of Scientific and Technical Information (OSTI), octobre 2019. http://dx.doi.org/10.2172/1601767.

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Dasberg, Shmuel, Jan W. Hopmans, Larry J. Schwankl et Dani Or. Drip Irrigation Management by TDR Monitoring of Soil Water and Solute Distribution. United States Department of Agriculture, août 1993. http://dx.doi.org/10.32747/1993.7568095.bard.

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Drip irrigation has the potential of high water use efficiency, but actual water measurement is difficult because of the limited wetted volume. Two long-term experiments in orchards in Israel and in California and several field crop studies supported by this project have demonstrated the feasibility of precise monitoring of soil water distribution for drip irrigation in spite of the limited soil wetting. Time Domain Reflectometry (TDR) enables in situ measurement of soil water content of well defined small volumes. Several approaches were tried in monitoring the soil water balance in the field during drip irrigation. These also facilitated the estimation of water uptake: 1. The use of multilevel moisture probe TDR system. This approach proved to be of limited value because of the extremely small diameter of measurement. 2. The placement of 20 cm long TDR probes at predetermined distances from the drippers in citrus orchards. 3. Heavy instrumentation with neutron scattering access tubes and tensiometers of a single drip irrigated almond tree. 4. High resolution spatial and temporal measurements (0.1m x 0.1m grid) of water content by TDR in corn irrigated by surface and subsurface drip. The latter approach was accompanied by parametric modelling of water uptake intensity patterns by corn roots and superimposed with analytical solutions for water flow from point and line sources. All this lead to general and physically based suggestions for the placement of soil water sensors for scheduling drip irrigation.

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