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Littérature scientifique sur le sujet « Radiometric simulations »

Auteur : Grafiati

Publié le 29 mars 2025

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Articles de revues sur le sujet "Radiometric simulations"

Marzano, F. S., D. Cimini et R. Ware. « Monitoring of rainfall by ground-based passive microwave systems : models, measurements and applications ». Advances in Geosciences 2 (22 juillet 2005) : 259–65. http://dx.doi.org/10.5194/adgeo-2-259-2005.

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Abstract. A large set of ground-based multi-frequency microwave radiometric simulations and measurements during different precipitation regimes are analysed. Simulations are performed for a set of frequencies from 22 to 60 GHz, representing the channels currently available on an operational ground-based radiometric system. Results are illustrated in terms of comparisons between measurements and model data in order to show that the observed radiometric signatures can be attributed to rainfall scattering and absorption. An inversion algorithm has been developed, basing on the simulated data, to retrieve rain rate from passive radiometric observations. As a validation of the approach, we have analyzed radiometric measurements during rain events occurred in Boulder, Colorado, and at the Atmospheric Radiation Measurement (ARM) Program's Southern Great Plains (SGP) site in Lamont, Oklahoma, USA, comparing rain rate estimates with available simultaneous rain gauge data.

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Maslanka, W., L. Leppänen, A. Kontu, M. Sandells, J. Lemmetyinen, M. Schneebeli, H. R. Hannula et R. Gurney. « Arctic Snow Microstructure Experiment for the development of snow emission modelling ». Geoscientific Instrumentation, Methods and Data Systems Discussions 5, n^o 2 (18 décembre 2015) : 495–517. http://dx.doi.org/10.5194/gid-5-495-2015.

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Abstract. The Arctic Snow Microstructure Experiment (ASMEx) took place in Sodankylä, Finland in the winters of 2013–2014 and 2014–2015. Radiometric, macro-, and microstructure measurements were made under different experimental conditions of homogenous snow slabs, extracted from the natural seasonal taiga snowpack. Traditional and modern measurement techniques were used for snow macro- and microstructure observations. Radiometric measurements of the microwave emission of snow on reflector and absorber bases were made at frequencies 18.7, 21.0, 36.5, 89.0 and 150.0 GHz, for both horizontal and vertical polarizations. Two measurement configurations were used for radiometric measurements: a reflecting surface and an absorbing base beneath the snow slabs. Simulations of brightness temperatures using two microwave emission models were compared to observed brightness temperatures. RMSE and bias were calculated; with the RMSE and bias values being smallest upon an absorbing base at vertical polarization. Simulations overestimated the brightness temperatures on absorbing base cases at horizontal polarization. With the other experimental conditions, the biases were small; with the exception of the HUT model 36.5 GHz simulation, which produced an underestimation for the reflector base cases. This experiment provides a solid framework for future research on the extinction of microwave radiation inside snow.

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Forster, Linda, Meinhard Seefeldner, Andreas Baumgartner, Tobias Kölling et Bernhard Mayer. « Ice crystal characterization in cirrus clouds II : radiometric characterization of HaloCam for the quantitative analysis of halo displays ». Atmospheric Measurement Techniques 13, n^o 7 (23 juillet 2020) : 3977–91. http://dx.doi.org/10.5194/amt-13-3977-2020.

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Abstract. We present a procedure for geometric, spectral, and absolute radiometric characterization of the weather-proof RGB camera HaloCamRAW and demonstrate its application in a case study. This characterization procedure can be generalized to other RGB camera systems with similar field of view. HaloCamRAW is part of the automated halo observation system HaloCam and designed for the quantitative analysis of halo displays. The geometric calibration was performed using a chessboard pattern to estimate camera matrix and distortion coefficients. For the radiometric characterization of HaloCamRAW, the dark signal and vignetting effect were determined to correct the measured signal. Furthermore, the spectral response of the RGB sensor and the linearity of its radiometric response were characterized. The absolute radiometric response was estimated by cross calibrating HaloCamRAW against the completely characterized spectrometer of the Munich Aerosol Cloud Scanner (specMACS). For a typical measurement signal the relative (absolute) radiometric uncertainty amounts to 2.8 % (5.0 %), 2.4 % (5.8 %), and 3.3 % (11.8 %) for the red, green, and blue channel, respectively. The absolute radiometric uncertainty estimate is larger mainly due to the inhomogeneity of the scene used for cross calibration and the absolute radiometric uncertainty of specMACS. Geometric and radiometric characterization of HaloCamRAW were applied to a scene with a 22∘ halo observed on 21 April 2016. The observed radiance distribution and 22∘ halo ratio compared well with radiative transfer simulations assuming a range of ice crystal habits and surface roughness values. This application demonstrates the potential of developing a retrieval method for ice crystal properties, such as ice crystal size, shape, and surface roughness using calibrated HaloCamRAW observations together with radiative transfer simulations.

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Lotfian, Ali, et Ehsan Roohi. « Radiometric flow in periodically patterned channels : fluid physics and improved configurations ». Journal of Fluid Mechanics 860 (7 décembre 2018) : 544–76. http://dx.doi.org/10.1017/jfm.2018.880.

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With the aid of direct simulation Monte Carlo (DSMC), we conduct a detailed investigation pertaining to the fluid and thermal characteristics of rarefied gas flow with regard to various arrangements for radiometric pumps featuring vane and ratchet structures. For the same, we consider three categories of radiometric pumps consisting of channels with their bottom or top surfaces periodically patterned with different structures. The structures in the design of the first category are assumed to be on the bottom wall and consist of either a simple vane, a right-angled triangular fin or an isosceles triangular fin. The arrangements on the second category of radiometric pumps consist of an alternating diffuse–specular right-angled fin and an alternating diffuse–specular isosceles fin on the bottom wall. The third category contains either a channel with double isosceles triangular fins on its lowermost surface or a zigzag channel with double isosceles triangular fins on both walls. In the first and the third categories, the surfaces of the channel and its structures are considered as diffuse reflectors. The temperature is kept steady on the horizontal walls of the channel; thus, radiometric flow is created by subjecting the adjacent sides of the vane/ratchet to constant but unequal temperatures. On the other hand, for the second category, radiometric flow is introduced by specifying different top/bottom channel wall temperatures. The DSMC simulations are performed at a Knudsen number based on the vane/ratchet height of approximately one. The dominant mechanism in the radiometric force production is clarified for the examined configurations. Our results demonstrate that, at the investigated Knudsen number, the zigzag channel experiences maximum induced velocity with a parabolic velocity profile, whereas its net radiometric force vanishes. In the case of all other configurations, the flow pattern resembles a Couette flow in the open section of the channel situated above the vane/ratchet. To further enhance the simulations, the predictions of the finite volume discretization of the Boltzmann Bhatnagar–Gross–Krook (BGK)–Shakhov equation for the mass flux dependence on temperature difference and Knudsen number are also reported for typical test cases.

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Maslanka, William, Leena Leppänen, Anna Kontu, Mel Sandells, Juha Lemmetyinen, Martin Schneebeli, Martin Proksch, Margret Matzl, Henna-Reetta Hannula et Robert Gurney. « Arctic Snow Microstructure Experiment for the development of snow emission modelling ». Geoscientific Instrumentation, Methods and Data Systems 5, n^o 1 (14 avril 2016) : 85–94. http://dx.doi.org/10.5194/gi-5-85-2016.

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Abstract. The Arctic Snow Microstructure Experiment (ASMEx) took place in Sodankylä, Finland in the winters of 2013–2014 and 2014–2015. Radiometric, macro-, and microstructure measurements were made under different experimental conditions of homogenous snow slabs, extracted from the natural seasonal taiga snowpack. Traditional and modern measurement techniques were used for snow macro- and microstructure observations. Radiometric measurements of the microwave emission of snow on reflector and absorber bases were made at frequencies 18.7, 21.0, 36.5, 89.0, and 150.0 GHz, for both horizontal and vertical polarizations. Two measurement configurations were used for radiometric measurements: a reflecting surface and an absorbing base beneath the snow slabs. Simulations of brightness temperatures using two microwave emission models, the Helsinki University of Technology (HUT) snow emission model and Microwave Emission Model of Layered Snowpacks (MEMLS), were compared to observed brightness temperatures. RMSE and bias were calculated; with the RMSE and bias values being smallest upon an absorbing base at vertical polarization. Simulations overestimated the brightness temperatures on absorbing base cases at horizontal polarization. With the other experimental conditions, the biases were small, with the exception of the HUT model 36.5 GHz simulation, which produced an underestimation for the reflector base cases. This experiment provides a solid framework for future research on the extinction of microwave radiation inside snow.

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Xing, Wenhe, Xueping Ju, Jian Bo, Changxiang Yan, Bin Yang, Shuyan Xu et Junqiang Zhang. « Polarization Radiometric Calibration in Laboratory for a Channeled Spectropolarimeter ». Applied Sciences 10, n^o 22 (23 novembre 2020) : 8295. http://dx.doi.org/10.3390/app10228295.

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The process of radiometric calibration would be coupled with the polarization properties of an optical system for spectropolarimetry, which would have significant influences on reconstructed Stokes parameters. In this paper, we propose a novel polarization radiometric calibration model that decouples the radiometric calibration coefficient and polarization properties of an optical system. The alignment errors of the polarization module and the variation of the retardations at different fields of view are considered and calibrated independently. According to these calibration results, the input Stokes parameters at different fields of view can be reconstructed accurately through the proposed model. Simulations are performed for the presented calibration and reconstruction methods, which indicate that the measurement accuracy of polarization information is improved compared with the traditional undecoupled calibration method.

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Rosenberger, Maik, Chen Zhang, Pavel Votyakov, Marc Preißler et Gunther Notni. « EMVA 1288 Camera characterisation and the influences of radiometric camera characteristics on geometric measurements ». ACTA IMEKO 5, n^o 4 (30 décembre 2016) : 81. http://dx.doi.org/10.21014/acta_imeko.v5i4.356.

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<p>Over the past decades, a large number of imaging sensors based mostly on CCD or CMOS technology were developed. Datasheets provided by their developers are usually written on their own standards and no universal figure of merit can be drawn from them for comparison purposes. The EMVA 1288 is a standard aims to overcome this problem by setting parameters and experimental setup for radiometric characterisation of cameras. An implementation of an experimental setup and software environment for radiometric characterisation of imaging sensors following the guidelines of the EMVA 1288 is presented here. Using simulations, the influences and impact of several EMVA 1288 parameters on geometric measurements can be estimated. This paper also presents a signal model and image acquisition chain; measurements of radiometric characteristics of an image sensor; and sensor evaluation for geometric measurements, where the aforementioned influences on geometric measurements are discussed.</p>

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Rykalová, Eva, Zdeněk Peřina, Radek Fabian et Petr Jonšta. « Possibilities of Use of the Thermographic Measurement as a Tool for Detecting Defects and Improving the Production Process ». Advanced Materials Research 1127 (octobre 2015) : 23–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1127.23.

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Infrared radiometric long-waved systems are widely used in various industries as well as in research and development. This long-waved system is the perfect tool for quick diagnosis of the state of the equipment, easy defect detection, which is reflected by higher temperatures due to increased friction and wear. Infrared radiometric long-waved systems are used especially in civil engineering, electrical engineering, metallurgy and many other industries. They are also used to optimize and improve of the production processes. The series of measurements using the infrared radiometric long-waved system in steel plant were carried out due to prepared research project. Images of temperature fields of ladles with liquid steel, cooled exhaust knee of electric arc furnace and ingot mould were obtained during solidification of steel ingot. Information about the state of wear of the refractory lining of the ladle, exhaust knee can be gained from obtained images. The obtained results can be used for more accurate numerical simulations of the process of casting and solidification of steel ingots.

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Wang, Haofei, Peng Zhang, Dekui Yin, Zhengqiang Li, Huazhe Shang, Hanlie Xu, Jian Shang, Songyan Gu et Xiuqing Hu. « Shortwave Infrared Multi-Angle Polarization Imager (MAPI) Onboard Fengyun-3 Precipitation Satellite for Enhanced Cloud Characterization ». Remote Sensing 14, n^o 19 (29 septembre 2022) : 4855. http://dx.doi.org/10.3390/rs14194855.

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Accurate measurement of the radiative properties of clouds and aerosols is of great significance to global climate change and numerical weather prediction. The multi-angle polarization imager (MAPI) onboard the Fengyun-3 precipitation satellite, planned to be launched in 2023, will provide the multi-angle, multi-shortwave infrared (SWIR) channels and multi-polarization satellite observation of clouds and aerosols. MAPI operates in a non-sun-synchronized inclined orbit and provides images with a spatial resolution of 3 km (sub-satellite) and a swath of 700 km. The observation channels of the MAPI include 1030 nm, 1370 nm, and 1640 nm polarization channels and corresponding non-polarization channels, which provide observation information from 14 angles. In-flight radiometric and polarimetric calibration strategies are introduced, aiming to achieve radiometric accuracy of 5% and polarimetric accuracy of 2%. Simulation experiments show that the MAPI has some unique advantages of characterizing clouds and aerosols. For cloud observation, the polarization phase functions of the 1030 nm and 1640 nm around the scattering angle of a cloudbow show strong sensitivity to cloud droplet radius and effective variance. In addition, the polarized observation of the 1030 nm and 1640 nm has a higher content of information for aerosol than VIS-NIR. Additionally, the unique observation geometry of non-sun-synchronous orbits can provide more radiometric and polarization information with expanded scattering angles. Thus, the multi-angle polarization measurement of the new SWIR channel onboard Fengyun-3 can optimize cloud phase state identification and cloud microphysical parameter inversion, as well as the retrieval of aerosols. The results obtained from the simulations will provide support for the design of the next generation of polarized imagers of China.

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Gege, Peter, et Arnold G. Dekker. « Spectral and Radiometric Measurement Requirements for Inland, Coastal and Reef Waters ». Remote Sensing 12, n^o 14 (13 juillet 2020) : 2247. http://dx.doi.org/10.3390/rs12142247.

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This paper studies the measurement requirements of spectral resolution and radiometric sensitivity to enable the quantitative determination of water constituents and benthic parameters for the majority of optically deep and optically shallow waters on Earth. The spectral and radiometric variability is investigated by simulating remote sensing reflectance (Rrs) spectra of optically deep water for twelve inland water scenarios representing typical and extreme concentration ranges of phytoplankton, colored dissolved organic matter and non-algal particles. For optically shallow waters, Rrs changes induced by variable water depth are simulated for fourteen bottom substrate types, from lakes to coastal waters and coral reefs. The required radiometric sensitivity is derived for the conditions that the spectral shape of Rrs should be resolvable with a quantization of 100 levels and that measurable reflection differences at at least one wavelength must occur at concentration changes in water constituents of 10% and depth differences of 20 cm. These simulations are also used to derive the optimal spectral resolution and the most sensitive wavelengths. Finally, the Rrs spectra and their changes are converted to radiances and radiance differences in order to derive sensor (noise-equivalent radiance) and measurement requirements (signal-to-noise ratio) at the water surface and at the top of the atmosphere for a range of solar zenith angles.

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Thèses sur le sujet "Radiometric simulations"

Haffoud, Paolo. « On-ground calibration of the intruments MAJIS/JUICE and SIMBIO-SYS/BepiColombo ». Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP008.

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Cette thèse a pour but d'améliorer le rendement scientifique de deux instruments spatiaux à bord de deux missions de l'ESA axées sur la formation planétaire, les dynamiques de surface et l'habitabilité au sein de notre système solaire. Les travaux de recherche se sont principalement concentrés sur l'étalonnage et la simulation des performances de deux instruments visible et infrarouge de pointe : le spectromètre MAJIS (Moons And Jupiter Imaging Spectrometer) sur la mission JUICE (Jupiter ICy moons Explorer) vers le système jovien et SIMBIO-SYS (Spectrometer and Imagers for MPO Bepicolombo Integrated Observatory SYStem) à bord de la mission BepiColombo vers Mercure. Des données d'étalonnage provenant de campagnes sol et de mesures en vol ont été analysées pour effectuer une caractérisation des deux détecteurs de MAJIS ainsi qu'un étalonnage spectral et spatial de MAJIS et radiométrique croisé de SIMBIO-SYS. Différentes métriques ont été caractérisées pour déterminer et documenter les performances et le comportement de ces instruments. En outre, sur la base des résultats de l'étalonnage, un module dédié aux simulations radiométriques et à l'optimisation des stratégies observationnelles a été développé pour MAJIS. Ce module permet de prédire les rapports signal/bruit et d'identifier les réglages instrumentaux qui permettent de maximiser le rendement scientifique de l'instrument. En faisant progresser l'étalonnage de ces instruments et en proposant des solutions aux défis opérationnels, cette thèse soutient les deux principales missions planétaires actuelles de l'ESA et introduit des méthodologies et des approches qui pourraient servir de base à de futures missions
This thesis aims to advance planetary exploration instrumentation by improving the scientific return of two ESA missions focused on planetary formation, surface dynamics, and habitability within our Solar System. The work focuses on the calibration and performance simulation of two advanced visible-to-infrared instruments: the MAJIS (Moons And Jupiter Imaging Spectrometer) spectrometer on the JUICE (Jupiter Icy moons Explorer) mission to the Jovian system and the SIMBIO-SYS (Spectrometer and Imagers for MPO Bepicolombo Integrated Observatory SYStem) aboard the BepiColombo mission to Mercury. Calibration data from ground campaigns and in-flight measurements were analyzed to complete detector characterization, spectral and spatial calibration, and radiometric cross-calibration. These efforts established reference values for instrument performance and behavior across key metrics. Additionally, based on the calibration results, a radiometric simulator and observational strategy optimization framework was developed for MAJIS. This framework enables the prediction of signal-to-noise ratios and identifies instrumental settings that maximize scientific return. By advancing calibration understanding and addressing operational challenges, this thesis supports the primary planetary missions of ESA and introduces methodologies and approaches that could serve as a foundation for future missions

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Liao, Wen-Jiao. « Physics-based radiometric signature modeling and detection algorithms of land mines using electro-optical sensors ». Columbus, Ohio : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5num=osu1064252075.

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Thesis (Ph. D.)--Ohio State University, 2003.
Title from first page of PDF file. Document formatted into pages; contains xxii, 255 p. : ill. (some col.). Advisors: Joel T. Johnson and Brian A. Baertlein, Dept. of Electrical Engineering. Includes bibliographical references (p. 247-255).

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Fleming, Austin. « Uncertainty Qualification of Photothermal Radiometry Measurements Using Monte Carlo Simulation and Experimental Repeatability ». DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3299.

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Photothermal Radiometry is a common thermal property measurement technique which is used to measure the properties of layered materials. Photothermal Radiometry uses a modulated laser to heat a sample, in which the thermal response can be used to determine the thermal properties of layers in the sample. The motivation for this work is to provide a better understanding of the accuracy and the repeatability of the Photothermal Radiometry measurement technique. Through this work the sensitivity of results to input uncertainties will be determined. Additionally, using numerical simulations the overall uncertainty on a theoretical measurement will be determined. The repeatability of Photothermal Radiometry measurements is tested with the use of a proton irradiated zirconium carbide sample. Due to the proton irradiation this sample contains two layers with a thermal resistance between the layers. This sample has been independently measured by three different researchers, in three different countries and the results are compared to determine the repeatability of Photothermal Radiometry measurements. Finally, from sensitivity and uncertainty analysis experimental procedures and suggestions are provided to reduce the uncertainty in experimentally measured results.

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Adams, Ian. « SIMULATION AND STUDY OF THE STOKES VECTOR IN A PRECIPITATING ATMOSPHERE ». Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3479.

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Precipitation is a dominating quantity in microwave radiometry. The large emission and scattering signals of rain and ice, respectively, introduce large contributions to the measured brightness temperature. While this allows for accurate sensing of precipitation, it also results in degraded performance when retrieving other geophysical parameters, such as near-surface ocean winds. In particular, the retrieval of wind direction requires precise knowledge of polarization, and nonspherical particles can result in a change in the polarization of incident radiation. The aim of this dissertation is to investigate the polarizing effects of precipitation in the atmosphere, including the existence of a precipitation signal in the third Stokes parameter, and compare these effects with the current sensitivities of passive wind vector retrieval algorithms. Realistic simulated precipitation profiles give hydrometeor water contents which are input into a vector radiative transfer model. Brightness temperatures are produced within the model using a reverse Monte Carlo method. Results are produced at three frequencies of interest to microwave polarimetry, 10.7 GHz, 18.7 GHz, and 37.0 GHz, for the first 3 components of the Stokes vector.
Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD

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Horne, Kyle S. « Nano-scale Thermal Property Prediction by Molecular Dynamics Simulation with Experimental Validation ». DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3089.

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Quantum cascade laser (QCL) diodes have potential applications in many areas including emissions analysis and explosives detection, but like many solid-state devices they suer from degraded performance at higher temperatures. To alleviate this drawback, the thermal properties of the QCL diodes must be better understood. Using molecular dynamics (MD) and photothermal radiometry (PTR), the thermal conductivity of a representative QCL diode is computed and measured respectively. The MD results demonstrate that size eects are present in the simulated systems, but if these are accounted for by normalization to experimental results the thermal conductivity of the QCL can be reasonably obtained. The cross-plane conductivity is found to be in the range of 1.8 to 4.3 W=m K, while the in-plane results are in the range of 3.7 to 4.0 W=m K. These values compare well with experimental results from the literature for both QCL materials and for AlInAs and GaInAs, which the QCL is composed of. The cross-plane conductivity results are lower than those of either AlInAs or GaInAs, which demonstrates the phonon scattering at the interfaces. The in-plane results are between AlInAs and GaInAs, which is to be expected. The PTR results are less concrete, as there seem to be heat transfer eects active in the samples which are not included in the models used to t the frequency scans. These effects are not 2D heat transfer artifacts nor are they the result of volumetric absorption. It is possible that they are the results of plasmon induction, but this is only supposition. As the data stand, the PTR and MD results are within an order of magnitude of each other and follow reasonable trends, which suggests that both results are not too far o from reality. While the experimental results are not entirely conclusive, the simulations and experiments corroborate each other suciently to warrant further investigation using these techniques. Additionally, the simulations present sucient internal consistency so as to be useful for thermal property investigation independent of the PTR results.

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Dechriste, Guillaume. « Méthodes numériques pour la simulation d'écoulements de gaz raréfiés autour d'obstacles mobiles ». Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0388/document.

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Ce travail est dédié à la simulation d’écoulements multidimensionnels de gaz raréfiés dans un domaine où l’interface avec le solide est mobile. Le comportement du gaz est modélisé par un modèle de type BGK de l’équation de Boltzmann et une méthode déterministe de vitesses discrètes est utilisée pour discrétiser l’espace des vitesses microscopiques.Dans ce document, nous proposons tout d’abord trois discrétisations spatiales du modèle qui permettent la prise en compte du mouvement des parois solides, grâce à un traitement spécifique des conditions aux limites. Ces approches sont implémentées et validées pour plusieurs cas unidimensionnels et à la suite de cette étude, la méthode maille coupée est choisie pour une extension à des écoulements de dimensions plus élevées.La suite du travail présente l’algorithme utilisé pour la simulation d’écoulements 2D et 3D. La précision et la robustesse de l’implémentation sont mises en avant grâce à la simulation de nombreux cas tests, dont les résultats sont comparés à ceux issus de la littérature. La méthode maille coupée a notamment été optimisée par une technique de raffinement de maillage adaptatif. La simulation instationnaire 3D de la rotation des pâles du radiomètre de Crookes illustre pleinement le potentiel de la méthode
This work is devoted to the multidimentional simulation of rarefied gases in a domain with moving boundary. The governing equation is given by BGKtype model of Boltzmann equation and velocity space is discretized with a standard discrete velocity method.We first propose three space discretizations that take boundary motion into account by specific treatment of the boundary conditions. These approaches are implemented and validated for several 1D flows. Based on this study, the cut cell method is chosen to be extend to multidimentional flows.Then we detail the cut cell algorithm for 2D and 3D flow simulations. Robustness and accuracy of the implementation are investigated through the simulation of numerous test cases. Our results are rigorously compared to the ones coming from the literature and good agreement is shown. The cut cell method has been optimized with an adaptive refinement mesh technique. The 3D unstationary simulation of the Crookes radiometer rotating vanes is a perfect illustration of the method potential

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Handley, Stephen Michael. « Monte Carlo simulations using MCNPX of proton and anti-proton beam profiles for radiation therapy ». Oklahoma City : [s.n.], 2010.

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Ullman, Gustaf. « Quantifying image quality in diagnostic radiology using simulation of the imaging system and model observers ». Doctoral thesis, Linköping : Department of Medicine and Health, Linköping University, 2008. http://www.bibl.liu.se/liupubl/disp/disp2008/med1050s.pdf.

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Assice, Antoine. « Detection en ondes millimetriques de defauts dielectriques ou semi-conducteurs dans un materiau a pertes ». Toulouse 3, 1987. http://www.theses.fr/1987TOU30182.

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Utilisation de la radiometrie en ondes millimetriques dans la recherche de discontinuites dielectriques dans les materiaux composites. Simulation en ondes millimetriques des variations de puissance qui existent entre la zone homogene et la zone contenant le defaut

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Roche, Jean-Christophe. « Localisation spatiale par subdivision pour l'accélération des calculs en radiométrie : ». Phd thesis, Université Joseph Fourier (Grenoble), 2000. http://tel.archives-ouvertes.fr/tel-00006752.

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La physique de la lumière ainsi que les outils géométriques pour la Conception Assistée par Ordinateur sont à la base des logiciels de simulation des phénomènes lumineux pour la fabrication des systèmes optiques. Ce n'est pas sans difficulté que les industriels conçoivent ces logiciels dont un des principaux handicaps est que les simulations sont très coûteuses en temps. L'objectif principal de ce travail est de rechercher et développer des algorithmes de calcul plus performants. Dans un premier temps, on décrit précisément le modèle du transport des photons dans ce contexte, composé de l'équation de Boltzmann accompagné de conditions de bord, et qui, dans le cas de milieux homogènes par morceaux, se ramène à l'équation de radiosité. Ensuite, on présente les outils géométriques utilisés dans le modeleur hybride CSG (Constructive Solid Geometry) et BRep (Boundary Representation) ainsi que les algorithmes de base nécessaires à la recherche d'intersections entre des demi-droites et des objets géométriques. Puis, un tour d'horizon des méthodes d'accélération des calculs en radiométrie par localisation spatiale est présenté. En tenant compte des contraintes industrielles, une telle méthode d'accélération est alors adaptée au contexte puis développée dans un environnement logiciel existant. Des expérimentations numériques montrent l'efficacité des nouvelles bibliothèques. Enfin, une étude théorique des complexités en temps et en mémoire liées aux méthodes de localisation spatiale, faisant intervenir les sommes de Minkowski d'ensembles géométriques, débouche sur une stratégie consistant à minimiser la complexité en temps pour choisir les paramètres de localisation.

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Livres sur le sujet "Radiometric simulations"

George, Xu Xie, et Eckerman K. F, dir. Handbook of anatomical models for radiation dosimetry. Boca Raton, FL : CRC Press/Taylor & Francis Group, 2010.

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McKenzie, NJ, MJ Grundy, R. Webster et AJ Ringrose-Voase. Guidelines for Surveying Soil and Land Resources. CSIRO Publishing, 2008. http://dx.doi.org/10.1071/9780643095809.

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Guidelines for Surveying Soil and Land Resources promotes the development and implementation of consistent methods and standards for conducting soil and land resource surveys in Australia. These surveys are primarily field operations that aim to identify, describe, map and evaluate the various kinds of soil or land resources in specific areas. The advent of geographic information systems, global positioning systems, airborne gamma radiometric remote sensing, digital terrain analysis, simulation modelling, efficient statistical analysis and internet-based delivery of information has dramatically changed the scene in the past two decades. As successor to the Australian Soil and Land Survey Handbook: Guidelines for Conducting Surveys, this authoritative guide incorporates these new methods and techniques for supporting natural resource management. Soil and land resource surveyors, engineering and environmental consultants, commissioners of surveys and funding agencies will benefit from the practical information provided on how best to use the new technologies that have been developed, as will professionals in the spatial sciences such as geomorphology, ecology and hydrology.

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(Editor), Xie George Xu, et Keith F. Eckerman (Editor), dir. Handbook of Anatomical Models for Radiation Dosimetry (Series in Medical Physics and Biomedical Engineering). Taylor & Francis, 2008.

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Chapitres de livres sur le sujet "Radiometric simulations"

Kopcov, Yaroslav, Yaroslaw Ilyushin, Boris Kutuza et Dobroslav Egorov. « Microwave Radiometric Mapping of Broken Cumulus Cloud Fields from Space : Numerical Simulations ». Dans Lecture Notes in Computer Science, 185–98. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-22941-1_13.

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Ilyushin, Yaroslaw, et Boris Kutuza. « Microwave Radiometry of Atmospheric Precipitation : Radiative Transfer Simulations with Parallel Supercomputers ». Dans Communications in Computer and Information Science, 254–65. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-05807-4_22.

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Bulgarelli, Barbara, et Davide D'Alimonte. « Simulation of In Situ Visible Radiometric Measurements ». Dans Experimental Methods in the Physical Sciences, 407–49. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-12-417011-7.00013-1.

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Gordon, Howard R. « Modeling and Simulating Radiative Transfer in the Ocean ». Dans Ocean Optics. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195068436.003.0005.

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The propagation of light in the sea is of interest in many areas of oceanography: light provides the energy that powers primary productivity in the ocean; light diffusely reflected by the ocean provides the signal for the remote sensing of subsurface constituent concentrations (particularly phytoplankton pigments); light absorbed by the water heats the surface layer of the ocean; light absorbed by chemical species (particularly dissolved organics) provides energy for their dissociation; and the attenuation of light with depth in the water provides an estimate of the planktonic activity. Engineering applications include the design of underwater viewing systems. The propagation of light in the ocean-atmosphere system is governed by the integral-differential equation of radiative transfer, which contains absorption and scattering parameters that are characteristic of the particular water body under study. Unfortunately, it is yet to be shown that these parameters are measured with sufficient accuracy to enable an investigator to derive the in-water light field with the radiative transfer equation (RTE). Furthermore, the RTE has, thus far, defied analytical solution, forcing one to resort to numerical methods. These numerical solutions are referred to here as “simulations.” In this chapter, simulations of radiative transfer in the ocean-atmosphere system are used (1) to test the applicability of approximate solutions of the RTE, (2) to look for additional simplifications that are not evident in approximate models, and (3) to obtain approximate inverse solutions to the transfer equation, e.g., to derive the ocean’s scattering and absorption properties from observations of the light field. The chapter is based on a lecture presented at the Friday Harbor Laboratories of the University of Washington directed to both students and experts. For the students, I have tried to make the material as self-contained as possible by including the basics, i.e., by providing the basic definitions of the optical properties and radiometry for absorbing-scattering media, developing the approximate solutions to the RTE for testing the simulations, detailing the model used for scattering and absorbing properties of ocean constituents in the simulations, and briefly explaining the simulation method employed. For the experts, I hope I have provided some ideas worthy of experimental exploration.

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Actes de conférences sur le sujet "Radiometric simulations"

Cote, Marie. « Optical systems image irradiance simulations ». Dans International Optical Design Conference. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/iodc.1998.lwb.3.

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This paper studies image plane irradiance distributions of diverse optical systems that have different pupil locations and that contain various amounts of image and pupil aberration. Its intent is to present data and rules of thumb that can help designers determine when accurate radiometric calculations depart significantly from first order ones.

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Devaney, A. J. « Infrared emission computed tomography ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.thd4.

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The problem of deducing the temperature profile of a weakly inhomogeneous, incoherent radiating object from external field measurements is addressed within the framework of classical second-order scalar coherence theory. Within this framework it is shown that the problem can be cast into an inverse radiometric problem using the concepts of generalized radiometry first introduced by Adrian Walther and subsequently extended and developed by Emil Wolf. The inverse radiometric problem is shown to be solvable by the reconstruction algorithms of diffraction tomography. Diffraction tomography is the generalization of conventional (x-ray) tomography to applications where wave (propagation) effects are dominant. In the usual applications of diffraction tomography an object is illuminated by an external wave and the resulting scattered wave is measured. In the problem under consideration here the object is not illuminated by an external wave. Rather the measured wave is emitted as a result of the temperature profile of the object. For this reason we have called the method propagation emission tomography. The presentation includes computer simulations of propagation emission tomography together with a discussion of practical applications of the method.

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Jaber, A., P. Lazaridis, B. Saeed, Y. Zhang, U. Khan, D. Upton, H. Ahmed et al. « Validation of partial discharge emulator simulations using free-space radiometric measurements ». Dans 2016 International Conference for Students on Applied Engineering (ICSAE). IEEE, 2016. http://dx.doi.org/10.1109/icsae.2016.7810238.

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Salmon, Neil A. « Experimental results and simulations from aperture synthesis three-dimensional radiometric imaging ». Dans SPIE Security + Defence, sous la direction de Neil A. Salmon et Sherif S. Ahmed. SPIE, 2016. http://dx.doi.org/10.1117/12.2231696.

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Salmon, Neil A., et Nick Bowring. « Simulations of three-dimensional radiometric imaging of extended sources in a security screening portal ». Dans SPIE Security + Defence, sous la direction de Neil A. Salmon et Eddie L. Jacobs. SPIE, 2015. http://dx.doi.org/10.1117/12.2197409.

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Amarin, Ruba A., Salem F. El-Nimri, James W. Johnson, W. Linwood Jones, Boon H. Lim et Christopher S. Ruf. « Instrument design simulations for synthetic aperture microwave radiometric imaging of wind speed and rain rate in hurricanes ». Dans 2007 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2007. http://dx.doi.org/10.1109/igarss.2007.4423540.

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Amarin, Ruba A., Salem El-Nimri, Suleiman Alsweiss, James Johnson et W. Linwood Jones. « Simulations for a wide swath synthetic aperture microwave radiometric imaging of wind speed and rain rate in hurricanes ». Dans SPIE Defense, Security, and Sensing, sous la direction de Weilin (Will) Hou et Robert A. Arnone. SPIE, 2010. http://dx.doi.org/10.1117/12.850290.

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Bush, Keith A. « Comparison of radiometric scaling laws and detailed wave-optics simulations for designing ground-based laser satellite-illumination and receiver systems ». Dans International Symposium on Optical Science and Technology, sous la direction de Jennifer C. Ricklin et David G. Voelz. SPIE, 2002. http://dx.doi.org/10.1117/12.453525.

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Marovic, Boris, Mathew Clark et James Petroski. « Analyzing Temperature Changes in Powered LEDs by Combining Thermal and Radiometric Characterization With Computational Fluid Dynamics ». Dans ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48635.

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This paper describes the workflow and improved accuracy of a combined characterization and simulation of an LED luminaire. The achieved measurement results of the thermal and radiometric characterization, the process of implementing these results into a thermal simulation, and the benefit for the luminaire designer are presented.

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Hauss, Bruce I., Hiroshi H. Agravante et Steven Chaiken. « Advanced radiometric millimeter-wave scene simulation : ARMSS ». Dans AeroSense '97, sous la direction de Roger M. Smith. SPIE, 1997. http://dx.doi.org/10.1117/12.277081.

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