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    Wyświetlanie 1-26 z 26
    Tytuł:
    Polarization in Optical Fibers
    Autorzy:
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008216.pdf
    Data publikacji:
    1999-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    Opis:
    Physical origin of polarization phenomena in highly birefringent optical fibers including nonlinear optical effects is discussed and their impact on applications to polarimetric optical fibers sensors is underlined.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 5; 749-760
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beam Propagation Method for Liquid Crystal-Core Optical Fiber Waveguides
    Autorzy:
    Szymańska, A.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008241.pdf
    Data publikacji:
    1999-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    42.81.Qb
    42.81.Dp
    Opis:
    Propagation effects in liquid crystal-core optical fiber waveguides were investigated and simulated by means of beam propagation method. Spatial propagation beam distribution for anisotropic liquid crystal fibers was defined by using BPM_CAD software package (courtesy of Optiwave Corporation). The field intensity was related to the refractive index of core at the liquid crystal fiber in two different waveguide configurations: planar and radial, whereas the number of the propagating modes was calculated. Numerical results were compared with some experimental data formerly obtained.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 5; 761-766
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Modulation in Elliptical-Core Liquid Crystal Fibers
    Autorzy:
    Nasiłowski, T.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008248.pdf
    Data publikacji:
    1999-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    Opis:
    An original idea of external parameters (electric field, temperature, pressure etc.) monitoring is presented. After the theoretical analysis of the light modulation in a liquid crystal and elliptical-core anisotropic fiber the latest experimental results are reported. Due to measurands-induced changes in birefringence and propagation conditions the liquid crystal and elliptical-core fiber uniting unique advantages of liquid crystals and quality of fiber technology acts as a sensing medium and can be used for continuous monitoring of different external parameters.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 5; 767-775
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Propagation in Liquid Crystal Fiber Structures
    Autorzy:
    Nasiłowski, T.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023819.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.79.Hp
    42.70.Df
    42.81.Qb
    Opis:
    The paper analyzes the light propagation in anisotropic liquid crystal fiber structures in order to find the possibilities to apply them to control and switch the polarization state and modulate some parameters of the transmitted light. The long term goal and motivation of the authors was the suggestion to replace the light modulating liquid crystal cell by a new generation of liquid crystal waveguides as an all-fiber light modulator, as well as sensors for different environmental parameters.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 193-200
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization Properties of Liquid-Crystal Elliptical-Core Fibers
    Autorzy:
    Szymańska, A.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023965.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    42.81.Qb
    42.81.Dp
    Opis:
    Polarization properties of liquid-crystal core optical fibers have been investigated. The liquid-crystal fiber is characterized by elliptical anisotropic core with low birefringence liquid crystal introduced by capillary axis. The paper presents also initial experimental results of the liquid-crystal fiber in the polarimetric configuration subjected to the influence of selected perturbations.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 201-205
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Experimental Analysis of Photonic Crystal Fiber Selectively Infiltrated with Silicon Oil
    Autorzy:
    Mileńko, K.
    Rutkowska, K.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399409.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.70.Qs
    42.81.Pa
    Opis:
    In this paper we demonstrate the numerical and experimental investigation of the photonic crystal fiber selectively infiltrated with polymer material, that is a silicon oil DC-704. The results are compared with those obtained for fully infiltrated fiber. The influence of the infiltration on light propagation properties, as well as on temperature sensitivity of the fiber are also presented. The infiltration causes the formation of photonic bandgap effect, and in the case of full infiltration the bandgaps shift equal to 50 nm is observed due to the change in external temperature in the range of about 40C (i.e. from 24 to 61°C).
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 589-591
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization Mode Dispersion in Birefringent Optical Fibers
    Autorzy:
    Woliński, T. R.
    Domański, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035695.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    42.25.Ja
    42.25.Dd
    Opis:
    The paper discusses influence of polarization mode dispersion on performance of polarimetric systems with highly birefringent fibers. It appeared that polarization mode dispersion strongly influences a degree of polarization that depends on coherence of the light source used and simultaneously diminishes dynamics of the output signal.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 211-219
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hollow-Core Bragg Fiber for Bio-Sensing Applications
    Autorzy:
    Mileńko, K.
    Hu, D.
    Shum, P.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506806.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.fk
    42.81.Pa
    42.81.-i
    42.79.Dj
    Opis:
    Theoretical analysis of propagation properties in a hollow-core Bragg fiber for bio-sensing applications has been demonstrated. Based on the Bragg fiber we propose a resonant sensor that operates on changes in refractive index of aqueous solution placed inside the hollow core. By using the transfer matrix method we analyzed the confinement loss of the $TE_{01}$ mode in the hollow-core Bragg fiber. We have shown the influence of the fiber geometry on the changes in the confinement loss. Spectral sensitivity and resolution of the sensor are also presented.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1205-1208
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Longitudinal Strain Induced Birefringence in Highly Birefringent Fiber for Dynamic Compensation of Polarization Mode Dispersion
    Autorzy:
    Domański, A. W.
    Lesiak, P.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035697.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    42.25.Ja
    42.25.Dd
    Opis:
    The paper addresses a compensation method of polarization mode dispersion based on longitudinal strain applied to a highly birefringent fiber introduced as apart from optical fiber link. As an introduction a short overview of the polarization mode dispersion compensation methods known up-to-now is done. Dependence of polarization mode dispersion on longitudinal strain is discussed. Some results of experiment with birefringence changes due to longitudinal strain in the bow-tie highly birefringent fiber necessary for dynamic polarization mode dispersion are presented.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 221-227
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards tuning of thermal sensitivity of the long period fiber gratings using a liquid crystal layer
    Autorzy:
    Czapla, A.
    Bock, W.
    Mikulic, P.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/200642.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    long period fiber grating
    liquid crystal
    sensors
    Opis:
    A high-efficiency thermal tuning filter based on a long-period fiber grating (LPFG) combined with a low-birefringence liquid crystal (LB LC) cladding layer is presented. Two types of LPFGs were studied and compared: the LPFGs based on a standard telecommunication fiber produced by an electric arc technique, and the LPFGs based on a boron co-doped fiber written by a UV technique. Both types of LPFGs when enhanced with an external LB LC layer exhibit two different temperature sensitivities, which depend on the temperature range of operation. For the LPFGs based on standard telecommunication fiber we can conclude that the presence of the LB LC cladding increases the thermal tuning efficiency by more than one order of magnitude over the value for the LPFGs in air. In the case of the LPFGs based on the boron co-doped fiber we discovered it is possible to obtain either a temperature-independent attenuation band or the attenuation bands with high temperature sensitivities, just by careful choice of the order of the cladding mode and the operating wavelength.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 503-508
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Electrically Tunable Long-Period Fiber Grating Using a Liquid Crystal Cladding Layer
    Autorzy:
    Czapla, A.
    Woliński, T.
    Nowinowski-Kruszelnicki, E.
    Bock, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506728.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Cn
    42.79.Dj
    42.81.Pa
    42.79.Kr
    Opis:
    The main aim of the presented work is the integration of a long-period fiber grating and a liquid crystal into a hybrid structure, in order to develop an innovative fiber optic device controlled by an external electric field. The studied long-period fiber grating was fabricated using UV irradiation in a boron co-doped fiber (PS1250/1500, manufactured by Fibercore). As a liquid crystal we used a typical 5CB nematic liquid crystal. The sensing mechanism of the proposed loss filter relies on long-period fiber grating attenuation bands sensitivity to optical properties of the liquid crystal layer. The results obtained show that the long-period fiber grating with a nanosized liquid crystal layer exhibits one order of magnitude higher electrical sensitivity and a lower level of the voltage control than the long-period fiber grating with a micro-sized liquid crystal layer.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1104-1107
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Different Liquid Crystal Materials under Planar and Homeotropic Boundary Conditions in Capillaries
    Autorzy:
    Chychłowski, M.
    Ertman, S.
    Nowinowski-Kruszelnicki, E.
    Dąbrowski, R.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493035.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    61.30.Jf
    77.84.Nh
    42.79.Kr
    Opis:
    We present a thermally-induced liquid crystal orientation method by applying an extra orienting layer onto an inner capillary surface that can induce either planar or homeotropic liquid crystal boundary conditions. Experimental evidence of boundary-induced orientation in two types of liquid crystal (nematic, chiral nematic) in a capillary are shown.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 582-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarimetric Fiber Optic System for Static and Dynamic Strain Measurement
    Autorzy:
    Konopka, W.
    Woliński, T. R.
    Domański, A. W.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023977.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    Opis:
    Polarization properties of the transmitted optical signal in polarimetric fiber-optic sensing systems for dynamic strain measurements as well as for smart structures applications are presented. The smart structure consists of highly birefringent fiber embedded in an epoxy cylinder.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 207-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral Tuning of the Long-Period Fiber Gratings by Using Low Birefringence Liquid Crystals
    Autorzy:
    Czapla, A.
    Bock, W.
    Woliński, T.
    Dąbrowski, R.
    Nowinowski-Kruszelnicki, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493037.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Cn
    42.79.Dj
    42.81.Pa
    42.79.Kr
    Opis:
    The work presented in this paper is focused on investigation of the spectral properties of the long-period fiber gratings combined with the liquid crystals, named liquid crystal long-period fiber gratings. The experiments carried out showed that the proposed designs of the liquid crystal long-period fiber gratings can offer very interesting spectral properties and can introduce a new level of sensitivity. In particular, a high-efficiency thermal tuning of the long-period fiber gratings coated with low-birefringence liquid crystal layers could be achieved and gave rise to a fast and wide switching ability of the attenuation bands within their transmission spectrum.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 589-592
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propagation Effects in Photonic Liquid Crystal Fibers with a Complex Structure
    Autorzy:
    Tefelska, M.
    Chychłowski, M.
    Woliński, T.
    Dąbrowski, R.
    Rejmer, W.
    Wójcik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506868.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    78.20.Bh
    42.79.Kr
    Opis:
    Chiral nematic liquid crystals are very interesting materials to infiltrate photonic crystal fibers since they are characterized by unique optical properties such as selective Bragg reflection, circular dichroism, and optical activity. In this paper the latest experimental results of the photonic crystal fibers filled with new chiral nematic liquid crystals are presented. Spectral properties of the light propagating in the photonic liquid crystal fibers have been measured and analyzed.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1259-1261
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photo-Induced Orientation of Nematic Liquid Crystals in Microcapillaries
    Autorzy:
    Chychłowski, M.
    Ertman, S.
    Tefelska, M.
    Woliński, T.
    Nowinowski-Kruszelnicki, E.
    Yaroshchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506727.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Cn
    42.79.Dj
    42.81.Pa
    42.79.Kr
    Opis:
    Axial and transversal orientational configurations of a nematic liquid crystal 6CHBT are realized inside glassy cylindrical capillaries by using photoalignment technique. It is demonstrated that this principle can be effectively used to enforce liquid crystal alignment in the desirable direction. It can be applied to control liquid crystal alignment in the photonic crystal fibers showing great potential for the modern telecommunication technologies.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1100-1103
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Nonlinearity in Liquid Crystalline Optical Waveguides
    Autorzy:
    Karpierz, M. A.
    Domański, A. W.
    Sierakowski, M.
    Świłło, M.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008217.pdf
    Data publikacji:
    1999-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Wi
    42.70.Df
    Opis:
    The analysis of optical orientational nonlinearity in nematic liquid crystalline planar waveguides is presented. The analyzed nonlinearity leads to unique properties that are not observed in other types of nonlinear waveguides. Theoretical results are confirmed by experimental data obtained in liquid crystalline directional couplers and in the self-focusing effect observed in the planar liquid crystalline waveguides.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 5; 783-792
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Długookresowe siatki światłowodowe jako czujniki drgań w materiałach kompozytowych
    Long period fiber gratings as vibration sensors in composite materials
    Autorzy:
    Domański, A. W.
    Czapla, A.
    Prokopczuk, K.
    Poczęsny, T.
    Bock, W.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/154785.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    światłowodowe siatki długookresowe
    światłowód
    czujnik
    drgania
    naprężenia
    materiały kompozytowe
    long period fiber gratings
    optical fiber
    sensor
    vibration
    stress
    composite materials
    Opis:
    Użycie czujników opartych na siatkach LPFG otwiera nowe możliwości diagnostyczno-pomiarowe, takie jak na przykład monitorowanie w czasie rzeczywistym stanu zużycia materiałów kompozytowych. Dzięki zatopieniu włókna w takim materiale możliwe jest monitorowanie drgań i naprężeń nie powodując przy tym znaczących zmian parametrów eksploatacyjnych i wytrzymałościowych kompozytu. W prezentowanej pracy przedstawiono zastosowanie siatek LPFG do detekcji deformacji geometrycznych oraz przeprowadzono badania porównawcze czujników światłowodowych z siatkami LPFG zatopionych w materiale kompozytowym z tego samego typu czujnikami pracującymi w swobodnej przestrzeni.
    Vigorously growing fiber-optic technology allows constructing sophisticated sensors to monitor vibrations and stress. Application of long period fiber gratings (LPFG) enables making an optical fiber sensitive to various external parameters caused by longitudinal or transverse stress changes in material. An additional advantage of sensors based on LPFG is the measuring part insensitivity to electromagnetic disturbance and lack of electric noise and interference emission. The manufacturing of optical fiber with LPFG is based on precise heating or exposition a part of the fiber to ultraviolet radiation thereby inducing a periodic change of the refraction index along the fiber core. As a result, the transmission spectrum of LPFG is characterized by a number of attenuation bands induced by coupling between the elementary mode propagating in the core and cladding modes. Location of the attenuation bands in the LPFGs transmission spectrum is dependent on external physical factors. This paper presents application of LPFG to geometric deformation detection. The use of sensors based on LPFG opens new diagnostic and measuring possibilities like real-time monitoring of composite material wear. Due to sinking the LPFGs in this material, it is possible to monitor the vibrations and stresses without causing significant changes in operational performance and durability of the composite. The paper also presents a comparative study on LPFGs sunk in composite material with the same type of LPFGs operating in free space.
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 7, 7; 809-811
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarimetric and Bragg Optical Fiber Sensors for Stress Distribution and Temperature Measurements in Composite Materials
    Autorzy:
    Lesiak, P.
    Szeląg, M.
    Mileńko, K.
    Woliński, T.
    Domański, A.
    Jędrzejewski, K.
    Boczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493251.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    62.23.Pq
    Opis:
    Composite structures are made from two or more constituent materials with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows us for introducing an optical fiber sensors matrix into the composite material. These sensors can demonstrate stress distribution inside a tested material influenced by external tensions. Two types of the optical fiber sensors, placed into one fiber simultaneously, are used as s matrix structure. One of them is based on application of the Bragg grating structure written inside the core of the fiber. Longitudinal stress modifies changes parameters of the Bragg grating and in the same, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which under external stress introduce polarization changes in the output light. These sensors placed into one fiber give a possibility to the measure two external tensions separately.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 698-701
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulations of Electrically Induced Birefringence in Photonic Liquid Crystal Fibers
    Autorzy:
    Ertman, S.
    Woliński, T.
    Beeckman, J.
    Neyts, K.
    Vanbrabant, P.
    James, R.
    Fernández, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506745.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    78.20.Bh
    42.79.Kr
    Opis:
    It has been recently experimentally demonstrated that propagation and polarization properties of the photonic liquid crystal fibers can be effectively tuned with the electric field. In particular, effective electric tuning of the phase birefringence has been obtained in the photonic liquid crystal fibers based on the high index glasses. Accurate numerical simulations of the impact of electric field on the guiding properties of the photonic liquid crystal fibers require complex methods, in which all important physical properties of the liquid crystal are taken into account (optical anisotropy, molecular orientation and relatively high losses). In this paper we present two different numerical approaches based on the finite element method. First one utilizes the simplified assumption of the "collective tilt" of molecules, and gives rough estimation of the phase birefringence tuning range. The second approach is much more rigorous, since electrically induced reorientation of the liquid crystal is calculated with a Q-tensor method giving the values of the inhomogeneous permittivity tensor. The value of the electrically induced birefringence calculated with the second method is in a good agreement with the experimental results.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1113-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Angular Orientation of the Embedded Highly Birefringent Fiber on PMD Changes under Axial Stress
    Autorzy:
    Budaszewski, D.
    Lesiak, P.
    Plaga, R.
    Rajan, G.
    Semenova, Y.
    Farrell, G.
    Boczkowska, A.
    Domański, A.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493020.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    62.23.Pq
    Opis:
    In the paper we present results of the research on polarization mode dispersion changes inside the polarimetric optical fiber sensors based on highly birefringent optical fibers embedded into composite materials with different angular orientations of the optical axes. Based on measurements made for different types of highly birefringent optical fiber sensors we have shown that strain sensitivities after lamination process are different in comparison to the data obtained before lamination. Our results indicate that polarization mode dispersion in side-hole highly birefringent fibers under axial stress strongly depends on fiber orientation in the composite material suggesting that orientation of the polarization axes of the highly birefringent fiber can be responsible for behavior of the fiber inside the composite material.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 575-578
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarimetric Optical Fiber Sensors for Dynamic Strain Measurement in Composite Materials
    Autorzy:
    Domański, A.
    Bieda, M.
    Lesiak, P.
    Makowski, P.
    Szeląg, M.
    Poczęsny, T.
    Prokopczuk, K.
    Sobotka, P.
    Chychłowski, M.
    Sierakowski, M.
    Woliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399338.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.79.Pw
    42.25.Bs
    42.81.Pa
    Opis:
    Polarimetric optical fiber sensors possess possibility of temperature compensation, dynamic and integral system of strain monitoring, as well as low cost of photo-detecting elements. In the paper we present results of the sensor analysis with different kinds of birefringent optical fibers leading to an optimal setup for dynamic strain monitoring in composite materials. A great attention is put on parameters of the light sources like coherence and width of spectrum and their influence on dynamics of the strain sensor.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 399-401
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Bragg and Polarimetric Optical Fiber Sensors for Stress Monitoring in Composite Materials
    Autorzy:
    Domanski, A.
    Lesiak, P.
    Milenko, K.
    Budaszewski, D.
    Chychlowski, M.
    Ertman, S.
    Tefelska, M.
    Wolinski, T.
    Jedrzejewski, K.
    Lewandowski, L.
    Jasiewicz, W.
    Helsztynski, J.
    Boczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795792.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    62.23.Pq
    Opis:
    Composite structures are made of two or more components with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows for introducing optical fiber sensors into the composite material. These sensors can demonstrate stress distribution inside tested material influenced by external tensions. Two types of the optical fiber sensors are used as the 3D structure. One of them is based on application of fiber Bragg grating inside the core of the fiber. Longitudinal stress changes parameters of the Bragg grating and simultaneously, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which, under external stress, introduce polarization changes of the output light.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 294-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photonic Liquid Crystal Fibers with Polymers
    Autorzy:
    Woliński, T.
    Tefelska, M.
    Mileńko, K.
    Siarkowska, A.
    Budaszewski, D.
    Domański, A.
    Ertman, S.
    Orzechowski, K.
    Rutkowska, K.
    Sierakowski, M.
    Nowinowski-Kruszelnicki, E.
    Dąbrowski, R.
    Mergo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399416.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    42.81.Wg
    02.60.Cb
    42.70.Qs
    Opis:
    Photonic liquid crystal fibers with polymers constitute a new solution based on liquid crystals and microstructured polymer optical fibers opening up new areas in innovative sensing and photonic devices applications. Compared with their silica-based microstructured fibers, it is easier to fabricate exotic microstructured polymer optical fibers by extrusion or drilling at low temperature; their nonlinearity is potentially stronger, the range of available polymers that may be drawn is more diverse and the biocompatibility of polymers is often better. Liquid crystals due to their attractive properties i.e., the high birefringence, high electro-optic and thermo-optic effects are a very good candidate for microstructured polymer optical fiber infiltration to obtain tunable all-in-fiber innovative photonic devices. The paper will discuss basic properties and possible applications of the polymer photonic liquid crystal fibers that will arise from their high optical tunability with external and internal factors. Current research effort is directed towards two main solutions: photonic crystal fibers and microstructured polymer optical fiber-based structures, both infiltrated with liquid crystals of tailored optical properties.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 613-616
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric analysis of the sensitivity of a prestressed concrete beam using the DOE simulation technique
    Parametryczna analiza wrażliwości belki strunobetonowej za pomocą techniki symulacyjnej DOE
    Autorzy:
    Woliński, Sz.
    Pytlowany, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/230714.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    planowanie eksperymentu
    DOE
    belka strunobetonowa
    ocena wrażliwości
    niezawodność konstrukcji
    design of experiment
    pretensioned concrete beam
    sensitivity assessment
    structure reliability
    Opis:
    The paper presents the method of simplified parametric analysis of the sensitivity of a pre-tensioned concrete beam. The presented approach is based on the DOE (design of experiments) data collection which is simulation technique allowing for identification of variables deciding about the effectiveness and costs of designed structures. Additionally, application of the hyper-surface of the construction response allows designers to the development of multi-dimensional trade-off graphs to facilitate, the assessment of the scope of changes in random state variables permitted due to the adequate criteria and selection of their values close to optimum. Design basics, procedures and results of the presented considerations of sensitivity assessment and reliability of the structure has been shown on the example of a pre-stressed concrete beam designed in accordance with the requirements and procedures of Eurocode 2.
    W artykule przedstawiono metodę analizy wpływu zmiennych wejściowych na parametry charakteryzujące stan konstrukcji sprężonych w początkowej i trwałej sytuacji obliczeniowej, opartą na symulacjach komputerowych i technice zbierania informacji DOE (Design Of Experiments). Założenia, procedury i wyniki zastosowania techniki DOE przedstawiono na przykładzie belki strunobetonowej zaprojektowanej zgodnie z wymaganiami Eurokodu 2. Przeprowadzono analizę typu „what-if” wpływu wartości obciążenia i siły sprężającej w poszczególnych cięgnach (uwzględniając straty wynikające z relaksacji stali sprężającej) oraz modułu sprężystości podłużnej betonu na nośność graniczną i maksymalne ugięcie belki.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 4; 97-112
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of load values using the Gumbel model
    Autorzy:
    Woliński, S.
    Pytlowany, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/230808.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obciążenie śniegiem
    obciążenie ekstremalne
    model Gumbela
    metoda Monte Carlo
    okres powrotu
    snow load
    extreme load
    Gumbel model
    Monte Carlo simulation
    return period
    Opis:
    The paper deals with application of the Gumbel model to evaluation of the environmental loads. According to recommendations of Eurocodes, the conventional method of determining return period and characteristic values of loads utilizes the theory of extremes and implicitly assumes that the cumulative distribution function of the annual or other basic period extremes is the Gumbel distribution. However, the extreme value theory shows that the distribution of extremes asymptotically approaches the Gumbel distribution when the number of independent observations in each observation period from which the maximum is abstracted increases to infinity. Results of calculations based on simulation show that in practice the rate of convergence is very slow and significantly depends on the type of parent results distribution, values of coefficient of variation, and number of observation periods. In this connection, a straightforward purely empirical method based on fitting a curve to the observed extremes is suggested.
    Źródło:
    Archives of Civil Engineering; 2012, 58, 2; 199-208
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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