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Wyszukujesz frazę "sensing technology" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
The Influence of Fibre Bending on Polarization-Dependent Twist Sensor Based on Tilted Bragg Grating
Autorzy:
Harasim, D.
Powiązania:
https://bibliotekanauki.pl/articles/221279.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optoelectronic sensors
tilted bragg grating
sensing technology
Opis:
This paper presents an experimental study on influence of input light polarization on the spectral characteristics of a fibre twist sensor based on Tilted Fiber Bragg Grating (TFBG) with simultaneous application of bending to an optical fibre. The application of proposed measurement stand could provide the ability of transforming the bending to a displacement. The twist measurement was performed by tuning of the sensor illuminating light polarization angle. The spectral parameters of selected cladding mode which are sensitive to the rotation of input light polarization angle have been shown. This paper shows the characteristics of transmittivity and wavelength shift for an incident high-order cladding mode measured with different curvatures of fibre. The dependency of selected cladding mode spectral parameters related with the twist measurement on the influence of temporary bending has been shown. The measurements were performed for two positions of sensing structure refractive index perturbations in relation to the bending direction plane. The experimental results show that the direction of TFBG structure bending has a small influence on the stability of spectral parameters characteristic for twist measurement, assuming that the bending direction is fixed while measurement.
Źródło:
Metrology and Measurement Systems; 2017, 24, 3; 577-584
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Informatization of educational process in high school pedagogical direction
Autorzy:
ЕROPOVA, Еlena
MEDVEDEV, Yriy
Powiązania:
https://bibliotekanauki.pl/articles/457229.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Rzeszowski
Tematy:
informatization
multimedia
telecommunications
remote sensing
means of training
information technology
Opis:
Informatization is an important component of the system of higher education, which includes not only traditional methods and forms of training, but also the use of multimedia, telecommunications, remote sensing means of training. The use of it in teaching gives the possibility to the students carry out course and diploma projects with the use of the programs: Word text editor, Excel spreadsheets, drawings are done in AutoCAD or ArchiCAD, graphics, Power Point, Corel Draw and Photoshop. Thanks to the introduction of information technologies into the process of teaching students with an interest carry out the work, as it allows you to show the individual abilities and increases the cognitive interest in the subjects. Information technology is convenient to use when conducting ratings of the tests (with multiple choice answers, with alternative answers, with freely конструируемыми answers), the independent work of the students. Regular use of computer programs facilitates the acquisition of in-depth and profound knowledge, development of creative thinking and abilities, the formation of the students ' motivation readiness to use the acquired knowledge, abilities and skills for the future profession of a teacher. Future specialists of the educational sphere should own it, to solve their professional tasks, successfully work with the children. Substantial assistance in this may have a modern information and computer technologies, without which the teachers of today are simply not do. Ability to use in their work modern it becomes one of the main components of professional training of teachers.
Źródło:
Edukacja-Technika-Informatyka; 2013, 4, 2; 54-56
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja procesu polarymetrycznej klasyfikacji obiektów realizowanego metodą dekompozycji
Simulation of object polarimetric classification process based on target decomposition technique
Autorzy:
Lila, B.
Kapelewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/209318.pdf
Data publikacji:
2009
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
elektronika
radiolokacja
teledetekcja własności fizycznych
electronics
radar technology
microwave remote sensing
Opis:
Dane uzyskiwane z zastosowaniem radaru polarymetrycznego SAR stanowią podstawę do numerycznej syntezy zobrazowań, zawierających informacje o charakterze i rodzaju obiektów występujących w badanym obszarze terenu. Efektem wstępnego etapu przetwarzania, którym jest kompresja azymutalna, są dane numeryczne stanowiące w swej istocie rodzaj czterowarstwowej mapy o wysokiej rozdzielczości, w której każdemu pikselowi lokalizacji przestrzennej przyporządkowane są cztery składowe polarymetrycznej macierzy rozpraszania. W kolejnym etapie realizowana jest dalsza konwersja danych, prowadząca do struktur opartych na macierzach kowariancji lub koherencji. Ostatni, najbardziej istotny etap przetwarzania realizowany jest na podstawie tzw. Polarymetrycznej dekompozycji obiektu. Jednym z wariantów dekompozycji jest metoda oparta na diagonalizacji macierzy koherencji z wykorzystaniem jej wektorów własnych. W artykule przedstawiono rezultaty eksperymentów numerycznych, przeprowadzonych z użyciem algorytmu wykorzystującego wariant ww. metody zwany dekompozycją Cloude'a.
In microwave remote sensing of many types of physical objects located at a ground surface, the technique using synthetic aperture radar (SAR) installed on an airborne or spaceborne platform, in view of output information, seems to be the most effective. A special variant of the mentioned technique is a technique basing on a polarimetric, two channel SAR (POL-SAR) use. Polarimetry basing on this technique is probably one of the more significant directions to expand the range of information, gained with "classic" SAR. At present, polarimetric SAR is still improved and widely accepted remote sensing technique. The data, obtained with the mentioned technique using from airborne or spaceborne mission, are the base for numerical imaging synthesis, and allow us to get a wide range of information about character and type of objects appearing in the analyzed terrain area. The first stage of a data processing, based on the data obtained with POL-SAR technique, is the azimuthal compression. The product of this process is numerical data, being in fact a four-layer numerical map with high azimuthal resolution. In this map, the four elements of Sinclair's polarimetric scattering matrix for each pixel are assigned. Complexity of scattering processes, which, in general, characterizes interaction between electromagnetic waves and many target types, considerably limits the usage of the "raw" images, obtained from this processing stage. The majority of obtained image cases are related to objects, being, from the standpoint of numerical representation, statistically homogeneous spatial distribution of accidentally located scattering centers, having deterministic characteristics. For full utilization of the obtained polarimetric information, a structure data conversion is used, ranging from data based on a Sinclair matrix to data based on coherency (or covariance) matrix. Coherency and covariance matrices are the result of object properties spatial averaging. In the next stage of the processing, the information about the nature of the objects, included in numerical images, is obtained. Such information already enables characterization and classification of registered objects. In reference to precision and accuracy of polarimetric SAR data reading, this most important stage of processing is realized, basing on polarimetric target decomposition algorithms. Generally, a choice of the most effective decomposition method, which will be used in a processing algorithm, depends on an assumed class of detected and characterized object. The class of the objects is determined, in statistical terms, by their special scattering characteristics. One of often taken treatments is a decomposition method, which bases on eigenvector coherency matrix diagonalization. The paper presents the results of numerical experiments, carried out with the algorithm based on Cloude's decomposition, being a variety of eigenvector decomposition method. The basic target of these experiments was evaluation of considered method in reference to its usefulness for vague objects characterization. A very important advantage of realized simulations was the ability to define, in view of objects classification reliability, the optimal scope of the considered method's application. The numerical processing was realized with the use of authentic polarimetric SAR mission data.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2009, 58, 4; 59-66
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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