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Wyświetlanie 1-15 z 33
Tytuł:
Phase coding of information in the optical fibre sensor
Autorzy:
Życzkowski, M.
Karol, M.
Pałka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1818224.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
optical fibre sensors
Mach-Zehnder interferometer
quantum sensors
Opis:
Determining the dependence of phase difference modulations between light pulses in a modified Mach-Zehnder interferometer was used to develop an optical system coding the information and working as an eavesdropping sensor for an optical fibre information exchange system. The basic challenge in the system development is to maintain stable operation in changing environmental conditions, as well as to ensure optimal parameters of the phase modulator. The system was tested for various many-kilometer long transmission lines of single-mode fibres. The research was focused on achieving the normative Bit Error Rate for the system in the 100 Mbit/s range (STM-1). Such a system can be used in commercial applications for the code key secure transmission in the physical layer of the link.
Źródło:
Opto-Electronics Review; 2020, 28, 1; 1--7
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Pilot Study of the Novel J-PET Plastic Scintillator with 2-(4-styrylphenyl)benzoxazole as a Wavelength Shifter
Autorzy:
Wieczorek, A.
Moskal, P.
Niedźwiecki, S.
Bednarski, T.
Białas, P.
Czerwiński, E.
Danel, A.
Gajos, A.
Gruntowski, A.
Kamińska, D.
Kapłon, Ł.
Kochanowski, A.
Korcyl, G.
Kowal, J.
Kowalski, P.
Kozik, T.
Krzemień, W.
Kubicz, E.
Molenda, M.
Pałka, M.
Raczyński, L.
Rudy, Z.
Rundel, O.
Salabura, P.
Sharma, N.
Silarski, M.
Słomski, A.
Smyrski, J.
Strzelecki, A.
Uchacz, T.
Wiślicki, W.
Zieliński, M.
Zoń, N.
Powiązania:
https://bibliotekanauki.pl/articles/1402620.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.57.uk
29.40.Mc
Opis:
For the first time a molecule of 2-(4-styrylphenyl)benzoxazole containing benzoxazole and stilbene groups is applied as a scintillator dopant acting as a wavelength shifter. In this article a light yield of the plastic scintillator, prepared from styrene doped with 2 wt% of 2,5-diphenylbenzoxazole and 0.03 wt% of 2-(4-styrylphenyl)benzoxazole, is determined to be as large as 60% ± 2% of the anthracene light output. There is a potential to improve this value in the future by the optimization of the additives concentrations.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1487-1490
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
Autorzy:
Wieczorek, A.
Zgardzińska, B.
Jasińska, B.
Gorgol, M.
Bednarski, T.
Białas, P.
Czerwiński, E.
Gajos, A.
Kamińska, D.
Kapłon, Ł.
Kochanowski, A.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krzemień, W.
Kubicz, E.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Rudy, Z.
Rundel, O.
Sharma, N. G.
Silarski, M.
Silarski, A.
Strzelecki, A.
Wiślicki, W.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/147132.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
free volume
positron annihilation
polystyrene
positronium
scintillator
Opis:
The polystyrene doped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K. Three structural transitions at 260, 283, and 370 K were found in the material. In the o-Ps intensity dependence on temperature, the significant hysteresis is observed. Heated to 370 K, the material exhibits the o-Ps intensity variations in time.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 777-781
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m
Autorzy:
Walczakowski, M.
Palka, N.
Czerwiński, A.
Sypek, M.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398672.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.60.Ei
07.57.Hm
07.57.Kp
07.57.Pt
33.20.Ea
Opis:
This work presents a terahertz system designed for the reflection spectroscopy of different materials located at a distance up to 5 m. The source of the radiation is a tunable solid-state optical parametric oscillator, which generates a narrow-band nanosecond pulses in the range of 0.7-2.5 THz. The signal is detected with relatively fast and having big sensitivity hot electron bolometer. The detailed description of each device and the functioning of the experimental setup are provided as well as the methodology of the measurement is explained. Investigations were performed in the 0.7-2.2 THz range in free space with relative humidity of about 40%. The experiment was divided into three series, each of which was carried out with different distance between the examined sample and the system - 1 m, 3 m, and 5 m. Obtained spectra of selected materials, including explosives, are similar to the results received from a purged time domain spectroscopy system. The observed small deviations are connected with fluctuations of the laser wavelength and the instability of the bolometer.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 689-692
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THz spectroscopy of explosive-related simulants and oxidizers
Autorzy:
Trzciński, T.
Palka, N.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200109.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
THz spectroscopy
explosive-related simulants
Opis:
In this paper we report on measurement of spectra of commonly applied explosives, some materials which can be used for manufacture of explosive and THz simulants of explosives in transmission mode. Substances were prepared as pellets, and the measurements were performed using the Time Domain Spectroscopy system in the range 0.1–3.0 THz.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 445-447
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple method for characterization of photonic crystal fibers
Autorzy:
Szustakowski, M.
Pałka, N.
Grabiec, W.
Powiązania:
https://bibliotekanauki.pl/articles/308773.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
photonic crystal fibers
far field distribution
characterization
Opis:
We report on our experimental characterization of index-guiding photonic crystal fibers (PCF) from their far field intensity distribution. The algorithm presented below makes it possible to determine the geometrical parameters of the PCF (core diameter, air hole spacing and air hole diameter) from its far field pattern. We obtained good agreement with the manufacturer's data for all fibers tested.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 2; 109-113
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Calibration of the J-PET Detector
Autorzy:
Skurzok, M.
Silarski, M.
Alfs, D.
Białas, P.
Shivani, S.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska-Kamińska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Mohammed, Muhsin
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Sharma, N.
Sharma, S.
Shopa, R.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1033283.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.20.fb
36.10.Dr
11.30.Er
24.80.+y
Opis:
The Jagiellonian positron emission tomograph project carried out in the Institute of Physics of the Jagiellonian University is focused on construction and tests of the first prototype of PET scanner for medical diagnostic which allows for the simultaneous 3D imaging of the whole human body using organic scintillators. The J-PET prototype consists of 192 scintillator strips forming three cylindrical layers which are optimized for the detection of photons from the electron-positron annihilation with high time-and high angular resolutions. In this article we present time calibration and synchronization of the whole J-PET detection system by irradiating each single detection module with a ²²Na source and a small detector providing common reference time for synchronization of all the modules.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1641-1644
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of hit time and hit position of annihilation quanta in the J-PET detector using the Mahalanobis distance
Autorzy:
Sharma, N. G.
Silarski, M.
Bednarski, T.
Białas, P.
Czerwiński, E.
Gajos, A.
Gorgol, M.
Jasińska, B.
Kamińska, D.
Kapłon, Ł.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krzemień, W.
Kubicz, E.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Rudy, Z.
Rundel, O.
Słomski, A.
Strzelecki, A.
Wieczorek, A.
Wiślicki, W.
Zieliński, M.
Zgardzińska, B.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/146937.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
J-PET detector
Mahalanobis distance
time resolution
threshold levels
Opis:
The J-PET detector being developed at the Jagiellonian University is a positron emission tomograph composed of the long strips of polymer scintillators. At the same time, it is a detector system that will be used for studies of the decays of positronium atoms. The shape of photomultiplier signals depends on the hit time and hit position of the gamma quantum. In order to take advantage of this fact, a dedicated sampling front-end electronics that enables to sample signals in voltage domain with the time precision of about 20 ps and novel reconstruction method based on the comparison of examined signal with the model signals stored in the library has been developed. As a measure of the similarity, we use the Mahalanobis distance. The achievable position and time resolution depend on the number and values of the threshold levels at which the signal is sampled. A reconstruction method as well as preliminary results are presented and discussed.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 765-769
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Frequency Domain Spectroscopy Identification System Based on Decision Trees
Autorzy:
Ryniec, R.
Zagrajek, P.
Pałka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1418036.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.Bm
42.81.Cn
42.81.Dp
Opis:
The application of pattern recognition methodology within chemistry, biology and other science domains, especially in security systems is becoming more and more important. Many classification algorithms are available in literature but decision trees are the most commonly exploited because of their ease of implementation and understanding in comparison to other classification algorithms. Decision trees are powerful and popular tools for classification and prediction. In contrast to neural networks, decision trees represent rules, which can readily be expressed so that humans can understand them or even directly use in a database. In this paper we present an algorithm of construction of decision trees and a classification rule extraction based on a logical relationship between attributes and a generalized decision function. Moreover, correctness and efficiency of the algorithm was experimentally validated in a terahertz system, where spectra of explosives were measured in reflection configuration.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 891-895
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the compress sensing theory for improvement of the TOF resolution in a novel J-PET instrument
Autorzy:
Raczyński, L.
Moskal, P.
Kowalski, P.
Wiślicki, W.
Bednarski, T.
Białas, P.
Czerwiński, E.
Gajos, A.
Kapłon, Ł.
Kochanowski, A.
Korcyl, G.
Kowal, J.
Kozik, T.
Krzemień, W.
Kubicz, E.
Niedźwiecki, S.
Pałka, M.
Rudy, Z.
Salabura, P.
Gupta-Sharma, N.
Silarski, M.
Słomski, A.
Smyrski, J.
Strzelecki, A.
Wieczorek, A.
Zieliński, M.
Zoń, N.
Powiązania:
https://bibliotekanauki.pl/articles/146280.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
compressed sensing
positron emission tomography
time-of-flight
Opis:
Nowadays, in positron emission tomography (PET) systems, a time of fl ight (TOF) information is used to improve the image reconstruction process. In TOF-PET, fast detectors are able to measure the difference in the arrival time of the two gamma rays, with the precision enabling to shorten signifi cantly a range along the line-of-response (LOR) where the annihilation occurred. In the new concept, called J-PET scanner, gamma rays are detected in plastic scintillators. In a single strip of J-PET system, time values are obtained by probing signals in the amplitude domain. Owing to compressive sensing (CS) theory, information about the shape and amplitude of the signals is recovered. In this paper, we demonstrate that based on the acquired signals parameters, a better signal normalization may be provided in order to improve the TOF resolution. The procedure was tested using large sample of data registered by a dedicated detection setup enabling sampling of signals with 50-ps intervals. Experimental setup provided irradiation of a chosen position in the plastic scintillator strip with annihilation gamma quanta.
Źródło:
Nukleonika; 2016, 61, 1; 35-39
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary studies of J-PET detector spatial resolution
Autorzy:
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Alfs, D.
Białas, P.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Mohammed, M.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Shivani, -
Silarski, M.
Skurzok, M.
Sharma, N.
Sharma, S.
Shopa, R.
Strzelecki, A.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1057928.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
87.57.uk
87.10.Rt
34.50.-s
Opis:
The J-PET detector, based on long plastic scintillator strips, was recently constructed at the Jagiellonian University. It consists of 192 modules axially arranged into three layers, read out from both sides by digital constant-threshold front-end electronics. This work presents preliminary results of measurements of the spatial resolution of the J-PET tomograph performed with ²²Na source placed at selected position inside the detector chamber.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1645-1648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex THz Reflectance Spectra of Hexogen Measured for Various Surfaces
Autorzy:
Palka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1418028.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.Pg
78.40.-q
78.47.jg
Opis:
In this paper, we report on measurements of reflection spectra of hexogen (RDX) by means of time domain spectroscopy. We analyzed both phase and amplitude of reflected impulses for three cases: detuning, samples with rough surfaces and samples with curved surfaces. It can be concluded that both spectral characteristics can be applied for identification of explosives in the reflection configuration.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 854-857
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupling in Core-Ring Photonic Crystal Fibers
Autorzy:
Palka, N.
Ciurapiński, W.
Wojcik, J.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1811539.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.Bm
42.81.Cn
42.81.Dp
Opis:
Experimental investigations of light coupling from a core into a ring caused by microbendings in photonic crystal fibres are shown. We present a setup arrangement, mode fields with and without coupling and a plot of power transfer versus localisation of the modulator along the fibre. We also show the most probable explanation of the obtained data.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-157-A-161
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of the p-Spectrum Method to the Higher Frequencies
Autorzy:
Pałka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1399394.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.-q
78.47.jg
Opis:
The p-spectrum method is a time domain spectroscopy-based technique for reflection analysis of materials (including explosives) that takes into account only part of the reflected signal, which is next analyzed via the Fourier transform. The method is limited to the frequencies of about 1.8 THz due to the pulse properties of our time domain spectroscopy setup. In this paper we theoretically prove that application of a shorter pulse can increase this frequency range up to 2.2 THz, that enables analysis of penthrite and octogen, two important explosives.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 534-537
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Focusing with 2D Square Photonic Crystal with Concavo-Concavo Boundaries
Autorzy:
Palka, N.
Ciurapinski, W.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807741.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
42.79.Bh
42.25.Bs
Opis:
We studied focusing properties of 2D square photonic crystal with concavo-concavo boundaries. The photonic crystal is built by air holes in a uniform dielectric. The incident plane wave propagates through a section of the photonic crystal and efficient focusing is observed by finite difference time domain simulations. To analyze the properties of photonic crystal we calculated the photonic band structure and equal frequency contours for TE modes. In our simulation we consider influence of geometry of the concave structures on the focusing properties.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 368-370
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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