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Wyświetlanie 1-10 z 12
Tytuł:
Optical activity of Ca3Ga2Ge4O14 crystals: experiment and calculus
Autorzy:
Shopa, Y
Ftomyn, N
Powiązania:
https://bibliotekanauki.pl/articles/174941.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
langasite
optical activity
polarimetry
polarizabilities
Opis:
Using a highly accurate polarimetric method, we determine the gyration tensor component g11 for Ca3Ga2Ge4O14 (CGG) crystals. For this aim we employ a single-wavelength high-accuracy polarimeter and eliminate the main systematic errors of our polarimetric measurements. A calculation technique based on the polarizability theory for optical activity (OA) is applied to derive optical rotatory power (ORP) for the CGG. A comparison of the observed and calculated OA parameters confirms the validity of our theoretical calculations. Dispersions of both the ordinary and extraordinary refractive indices and the ORP are calculated.
Źródło:
Optica Applicata; 2013, 43, 2; s. 217-228
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Localized plasma polarimetry based on the phenomenon of normal mode conversion
Autorzy:
Kravtsov, , Y. A.
Bieg, B.
Powiązania:
https://bibliotekanauki.pl/articles/146670.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma
polarimetry
mode conversion
Opis:
A new geometry of microwave polarimetric measurements is presented, which realizes a localized plasma polarimetry based on the phenomenon of electromagnetic mode conversion. Such a conversion takes place in the tokamak plasma, in the vicinity of the point where the microwave beam is orthogonal to one of the helical magnetic lines. In distinction to the traditional plasma polarimetry, which deals with the line averaged plasma parameters, the new methodology allows for a measurement of the local values of plasma parameters near the point of orthogonality. This methodology was shown to be very efficient in studies of the solar radio emission and polarization properties of radio waves passing through the Earth ionosphere. In the following the theory of electromagnetic mode conversion is described and conditions of its applicability are analyzed. It is shown that localized polarimetric measurements of plasma parameters in the geometry of the international thermonuclear experimental reactor (ITER) device would require very high electron densities Ne, exceeding 1017 cm–3, i.e. thousand times higher than those envisaged in the ITER project.
Źródło:
Nukleonika; 2011, 56, 2; 171-174
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualization of pathologic changes in liver tissue via polarized light
Autorzy:
Stoilova, Ani
Blagoeva, Blaga
Nazarova, Dimana
Stoykova, Elena
Berberova-Buhova, Nataliya
Nedelchev, Lian
Machikhin, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/2172829.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
polarized light imaging
tissue polarimetry
liver tissue
Opis:
In this work, we applied two polarized light based approaches to visualize histological patterns of liver pathologies. The first one involves acquisition of two images through a polarizing microscope, one image (Ppar) acquired with the analyzer oriented parallel to the polarization of illumination and the other (Pper) acquired with the analyzer oriented perpendicular to the illumination. The final image is based on the polarization ratio, Preconstructed = (Ppar – Pper)/(Ppar + Pper). Using the second technique, the histological specimens were illuminated with a polarized laser beam with wavelength of 635 nm. Polarimetric parameters as azimuth, angle of ellipticity, degree of polarization and reflected power have been measured to quantify the change in the polarization state of the incident light after interaction with the sample of the healthy tissue and of the tissue with abnormal morphological changes.
Źródło:
Optica Applicata; 2022, 52, 3; 395--404
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of the Fe1-xNix Invar alloys by monochromatic circularly polarized source
Autorzy:
Satuła, D.
Szymański, K.
Dobrzyński, L.
Rećko, K.
Waliszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/148805.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Invar alloys
Mössbauer polarimetry
transition metal alloys
Opis:
X-ray diffraction measurements and Mössbauer spectroscopy with and without external magnetic field parallel to beam direction have been performed for Fe1-xNix (x = 0.25, 0.30, 0.35) alloys. The compositions of the studied alloys were chosen in order to cover the concentration range where the fcc - bcc structural transformation appears, as well as where single phase fcc Fe-Ni alloys exhibit the Invar phenomena. Spatial distribution of the iron magnetic moments is discussed. The hyperfine magnetic field (h.m.f.) distribution is analyzed within a scope of two models discussed in the literature. In the first model it is assumed that any hyperfine magnetic filed vector have the same spatial distribution (the same values of (). In the second, the low field component of the hyperfine magnetic field is ordered antiferomagnetically (or disordered) while the high field component is aligned by an external magnetic field. In order to determine the mean values of cosine of the angle between teta-rays direction and hyperfine field vector of iron, (), a monochromatic circularly polarized Mössbauer source (MCPMS) was used. The analysis of the MCPMS results show that the shapes of the measured spectra can be explained by single values of .
Źródło:
Nukleonika; 2003, 48,suppl.1; 71-74
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of design and signal processing of polarimetric imaging cameras
Autorzy:
Bieszczad, Grzegorz
Gogler, Sławomir
Świderski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1818202.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
thermovision
imaging polarimetry
optical system
optical architectures
image processing
Opis:
Thermal-imaging systems respond to infrared radiation that is naturally emitted by objects. Various multispectral and hyperspectral devices are available for measuring radiation in discrete sub-bands and thus enable a detection of differences in a spectral emissivity or transmission. For example, such devices can be used to detect hazardous gases. However, their operation principle is based on the fact that radiation is considered a scalar property. Consequently, all the radiation vector properties, such as polarization, are neglected. Analysing radiation in terms of the polarization state and the spatial distribution of thereof across a scene can provide additional information regarding the imaged objects. Various methods can be used to extract polarimetric information from an observed scene. We briefly review architectures of polarimetric imagers used in different wavebands. First, the state-of-the-art polarimeters are presented, and, then, a classification of polarimetric-measurement devices is described in detail. Additionally, the data processing in Stokes polarimeters is given. Emphasis is laid on the methods for obtaining the Stokes parameters. Some predictions in terms of LWIR polarimeters are presented in the conclusion.
Źródło:
Opto-Electronics Review; 2021, 29, 1; 5--12
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of design and signal processing of polarimetric imaging cameras
Autorzy:
Bieszczad, Grzegorz
Gogler, Sławomir
Świderski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1818209.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
thermovision
imaging polarimetry
optical system
optical architectures
image processing
Opis:
Thermal-imaging systems respond to infrared radiation that is naturally emitted by objects. Various multispectral and hyperspectral devices are available for measuring radiation in discrete sub-bands and thus enable a detection of differences in a spectral emissivity or transmission. For example, such devices can be used to detect hazardous gases. However, their operation principle is based on the fact that radiation is considered a scalar property. Consequently, all the radiation vector properties, such as polarization, are neglected. Analysing radiation in terms of the polarization state and the spatial distribution of thereof across a scene can provide additional information regarding the imaged objects. Various methods can be used to extract polarimetric information from an observed scene. We briefly review architectures of polarimetric imagers used in different wavebands. First, the state-of-the-art polarimeters are presented, and, then, a classification of polarimetric-measurement devices is described in detail. Additionally, the data processing in Stokes polarimeters is given. Emphasis is laid on the methods for obtaining the Stokes parameters. Some predictions in terms of LWIR polarimeters are presented in the conclusion.
Źródło:
Opto-Electronics Review; 2021, 29, 1; 5--12
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new method of determining the parameters of thermonuclear plasma on the basis of multichannel polarimetric measurements
Autorzy:
Chrzanowski, J.
Kravtsov, Y.A.
Powiązania:
https://bibliotekanauki.pl/articles/148759.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
angular variables
gradient method
plasma diagnostics
plasma polarimetry
polarimetric data inversion
Opis:
A gradient method has been proposed as an effective procedure to reconstruct real parameters of tokamak plasma by means of multichannel polarimetric measurements. High efficiency of the suggested procedure is illustrated by numerical calculations performed for a given plasma model taking into account the poloidal component of magnetic field. Polarization state of electromagnetic wave traditionally is characterized by azimuthal – ψ and ellipticity – χ angles. Evolution of these parameters along the ray is described by the equations of angular variables technique (AVT) introduced in previous works of the present authors. Numerical simulations have approved that the gradient procedure provides acceptable accuracy of inversion already after several iterations.
Źródło:
Nukleonika; 2013, 58, 2; 281-285
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doppler polarimetric ground clutter identification and suppression for atmospheric radars based on co-polar correlation
Autorzy:
Moisseev, D.
Unal, C.
Russchenberg, H.
Ligthart, L.P.
Powiązania:
https://bibliotekanauki.pl/articles/309106.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radar polarimetry
ground clutter suppression
Doppler radar
atmospheric radar remote sensing
Opis:
A new clutter suppression technique that uses both Doppler and polarimetric information is presented. Polarimetric properties of the target and clutter are calculated per Doppler frequency cell and based on this information clutter suppression is performed. This new clutter suppression technique is demonstrated with radar measurements of precipitation made by the Delft atmospheric research radar (DARR).
Źródło:
Journal of Telecommunications and Information Technology; 2001, 4; 3-6
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constant co-polarized echo curves on the Poincare sphere
Autorzy:
Czyż, Z.H.
Powiązania:
https://bibliotekanauki.pl/articles/309100.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radar polarimetry
Poincare sphere module of scattering matrix
Kennaugh matrix
Cassini ovals
Opis:
A set of useful formulae has been presented allowing for computation of the equipower curves on the Poincare sphere of the co-polarized radar returns for both mono- and bi-static scatterings.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 4; 7-10
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpretacja danych ENVISAT/ASAR o przemiennej polaryzacji na obszarach zurbanizowanych w kontekście charakterystyki stabilnych rozpraszaczy (Persistent Scatterers)
SAR Persistent Scatterers: targets characterization in urbanized areas with ENVISAT alternating polarisation data
Autorzy:
Perski, Z.
Ketelaar, G.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/130420.pdf
Data publikacji:
2006
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
interferometria SAR
persistent scatterer
polarymetria
ERS
ENVISAT
persistent scatterers
SAR interferometry
SAR polarimetry
incidence angle
urban area
Opis:
The scope of presented work was to apply the ENVISAT/ASAR data acquired in different alternating polarization modes and under different viewing geometry to characterize Persistent Scatterers (PS) in the context of their scattering mechanism. Persistent Scatterers are explored by SAR interferometry (InSAR) in the Persistent Scatterers Interferometry (PS-InSAR) method. This technique is nowadays one of the most actively developing branches of InSAR. It utilizes coherent natural "radar reflectors" with a consistent reflectivity pattern in time. The PS-InSAR method is the first one to allow the exploration of almost all archived SAR data over a certain area and can retrieve a long-term series of the observations of the individual PS points. Despite this, PS-InSAR used as an operational method of the scattering mechanisms of individual PS is still not fully explored. It is usually not known if the scatterer has specular, dihedral or trihedral geometry and if the reflection comes from one individual strong target or a set of targets located within the resolution cell. Knowledge about scatterer characteristics is very important to separate scatterers representing different deformation regimes: e.g. subsidence, deformations of the construction, soil compaction. This problem becomes crucial if spatial interpolation of the deformation signal is required. A high density of PS is typical for densely urbanized areas (> 100 PS/km²). Urban areas are also ones of the highest interests, in terms of inhabitants’ safety. For purposes of this study, Malbork City in Northern Poland was selected because of its very good coverage of ASAR alternating polarization data acquired under different modes and incidence angles. The specific various ASAR acquisitions have been designed for the purposes of the ESA AO-783 project which was focused on environmental and agricultural classification. A set of Persistent Scatterers has been collected by processing a stack of 55 ERS-1/2 SAR scenes (ESA C1P.3915 project) using Delft University of Technology’s implementation of the PSI method. The 5683 PS points have been obtained that have a coherent behavior. ASAR scenes were calibrated and an analysis of auto-interferogram phase and image amplitudes was performed. Further analysis of the ASAR data is focused on the relationship between incidence angle variations and amplitude, and on the change of polarization. The results were compared with the scattering models of canonical scatterers (specular, dihedral and trihedral). Preliminary results show that applications of variable incidence angle and alternating polarization data are a promising technique regarding scatterer characterization. However, to fully quantitatively analyze the data, precise coregistration is required.
W artykule przedstawiono próbę wykorzystania danych ENVISAT/ASAR zarejestrowanych w różnych trybach polaryzacji przemiennej i przy różnej geometrii padania wiązki radarowej do scharakteryzowania rozpraszaczy stabilnych (Persistent Scatterers - PS) w kontekście określenia ich mechanizmu odbicia. Rozpraszacze stabilne wykorzystuje się w satelitarnej interferometrii radarowej (InSAR) w tzw. metodzie interferometrii rozpraszaczy stabilnych (Persistent Scatterers SAR Interferometry - PSInSAR). Zagadnienie to jest szczególnie istotne dla określenia charakteru mierzonej metodą PSInSAR deformacji w danym punkcie. Największe skupiska PS (pow. 100 PS/km²) spotyka się na obszarach zabudowanych, gdzie pozwala na to geometria obiektów składająca się z płaszczyzn, materiał, brak rozpraszania objętościowego powodowanego przez roślinność, a także stabilność w czasie. Dla przeprowadzenia omawianych badań wytypowano miasto Malbork z uwagi na niewielkie rozmiary (łatwa identyfikacja obiektów) i dobre pokrycie danymi ASAR w trybach polaryzacji przemiennej uzyskane w projekcie ESA AO-783. Zbiór rozpraszaczy stabilnych dla obszaru Malborka uzyskano metodą PSInSAR na podstawie serii 55 rejestracji ERS-1/2 SAR pozyskanych w ramach projektu ESA C1P.3915. Łącznie wyznaczono 5 683 punkty a następnie przeprowadzono analizę amplitudy i fazy dla wybranych obiektów na obrazach ASAR. Badano zależności fazy auto-interferogramów obrazów AP (alternate polarization) oraz zależności amplitudy od zmiany kąta padania wiązki. Otrzymane wyniki porównano z modelami odbicia fali radarowej od 3 elementarnych typów reflektorów: jednościennych, dwuściennych i trójściennych. Wstępne wnioski potwierdzają przydatność obrazów o polaryzacji przemiennej i różnym kącie padania wiązki do rozpoznawania charakterystyki PS.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2006, 16; 467-482
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 12

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