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    Wyświetlanie 1-7 z 7
    Tytuł:
    Physical foundations determining spectral characteristics measured in Bragg gratings subjected to bending
    Autorzy:
    Kisała, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2173892.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical fibers
    tilted fiber Bragg grating
    bending sensors
    Opis:
    The article presents an analysis of the impact of bending optical fibers with tilted Bragg gratings on their spectral parameters. This article proves that it is possible to a choose TFBG cladding mode and the optical spectrum range related to it that allows the best metrological properties to be obtained when measuring bend. The results contained in the paper explain why the minima in the spectral characteristics, corresponding only to some cladding modes, change their shape during TFBG bending, which is important for application of Bragg gratings as bending sensors. It has been presented that in the case of TFBG we are able to aggregate the knowledge obtained during experiment to the form of a physical model of the fiber bending sensor.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 573--584
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental determination of the characteristics of a transmission spectrum of tilted fiber Bragg gratings
    Autorzy:
    Tolegenova, Akmaral
    Kisała, Piotr A.
    Zhetpisbayeva, Ainur
    Mamyrbayev, Orken
    Medetov, Bekbolat
    Powiązania:
    https://bibliotekanauki.pl/articles/221509.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical fiber
    phase mask method
    tilted fiber Bragg grating
    Opis:
    In this article, we study tilted fiber Bragg gratings (TFBGs) with tilt angles of 6°and 8°, their transmission spectra, and spectral parameters that have a linear dependence on the refractive index of the environment. It is shown that there can be several such characteristics, such as the minimum, width and energy of the spectrum. The linear dependence of the spectrum width on the refractive index does not depend on the tilt angle. The linear dependence of the spectrum minimum is only observed for a tilt angle of 8°. The results of this work can be used to create a sensor system based on an optical fiber.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 3; 581-589
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of Strains with a Non-smooth Distribution and Temperature Using Optical Fiber Bragg Grating
    Autorzy:
    Detka, Małgorzata
    Kaczmarek, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/2124758.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fiber Bragg grating
    non-smooth strain distribution
    reflection spectrum
    Opis:
    This paper presents a simulation study of the simultaneous reconstruction of the non-smooth strain distribution of an optical fiber Bragg grating and its temperature, which is based on the reflection spectrum of the reflected beam of the grating. The transition matrix method was used to model the reflection spectrum of the grating, and the nonlinear NelderMead optimization method was used to simultaneously reconstruct the strain distribution along the grating and its temperature. The results of simulations of simultaneous reconstruction of the strain profile and temperature indicate good accord with the strain profiles and temperature set. The reconstruction errors of the strain profiles are less than 1.2 percent and the temperature change errors are less than 0.2 percent, with a noise level of 5 percent.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 3; 535--540
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distributed strain reconstruction based on a fiber Bragg grating reflection spectrum
    Autorzy:
    Detka, M.
    Kaczmarek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/220892.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fiber Bragg grating (FBG)
    synthesis
    distributed sensing
    transfer matrix method
    Opis:
    In this paper, we present a synthesis of the parameters of the fiber Bragg grating (FBG) and the reconstruction of the distributed strain affecting the grating, performed by means of its reflection spectrum. For this purpose, we applied the transition matrix method and the Nelder-Mead nonlinear optimization method. Reconstruction results of the strain profile carried out on the basis of a simulated reflection spectrum as well as measured reflection spectrum of the FBG indicate good agreement with the original strain profile; the profile reconstruction errors are within the single digit percentage range. We can conclude that the Nelder-Mead optimization method combined with the transition matrix method can be used for distributed sensing problems.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 53-64
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Execution Simulation Design of Fiber-to-the- home (FTTH) Device Ingress Networks Using GPON with FBG Based on OptiSystem
    Autorzy:
    Shabaneh, Arafat Abdallah
    Melhem, Masa Loai
    Powiązania:
    https://bibliotekanauki.pl/articles/2200708.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fiber to the home
    fiber Bragg grating
    power link budget
    Q-factor
    gigabit passive optical networks
    Opis:
    Consumers require high-speed data transmission for different activities, such as smartphone usage, live broadcasting of news, and video conferencing. Therefore, a reliable communication network is needed to provide this kind of service to users. Fiber to the home (FTTH) is an optical fiber architecture that uses fiber cables in the access network for direct and final connection to homes or offices of customers. Networks based on FTTH can offer high performance, speed, and quality. An optical fiber communication system based on FTTH device ingress network using gigabit passive optical networks (GPONs) with fiber Bragg grating (FBG) and optical amplifier is designed and analyzed in this study. The developed design based on the FTTH device and FBG shows a low bit error rate (BER) for downstream and upstream configurations with an optical fiber length of 20 km. Downstream and upstream configurations achieve a Q-factor of 89.5 and 181.3, respectively. Achievable sensitivity of the developed system is −28 dBm, while the received signal based on OptiSystem is −25.59 dBm. FTTH with FBG will play a major role in the future and provide effective solutions for a wide variety of applications in network communication systems and data transmission rates.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 783--791
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The experimental instrumented bolt with fibre bragg grating force sensors
    Autorzy:
    Wang, Tuo
    Chang, Jucai
    Gong, Peng
    Shi, Wenbao
    Li, Ning
    Cheng, Shixing
    Powiązania:
    https://bibliotekanauki.pl/articles/219784.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    siatka światłowodowa
    system kotwienia
    wspornik śruby
    fiber Bragg grating
    pullout testing
    anchorage systems
    pre-tightening torque
    bolt support
    Opis:
    Monitoring the stress change of bolt and knowing the anchoring condition in a reasonable and effective way, accurately, can effectively prevent tunnel accident from breaking out. The stress of rock mass around the roadway is usually transferred to the anchor rod in the form of axial load, so it is of great significance to study the axial load of the bolt. In this paper, a full size anchoring and drawing experiment system was designed and established, innovatively, which realized the pull-out test of 2.5 m prestressed end Anchorage and the full-length Anchorage by using the new resin anchorage agent under vertical and horizontal loads. Through the application of fiber Bragg grating (FBG) sensing technology to the test of full-scale anchor rod, the axial force distribution characteristics of the end Anchorage and the full-length Anchorage anchor rod were obtained under the action of pre-tightening torque and confining rock pressure. The comparison indicates that the proportion of high stress range accounts for only 17.5% and the main bearing range is near the thread end of anchor rod, the proportion of main bearing range of end Anchorage is 83.3%, and the feasibility of FBG force-measuring anchor rod is verified in the field. The research results have certain reference value.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 1; 179-194
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel method of elimination of light polarization cross sensitivity on tilted fiber Bragg grating bending sensor
    Autorzy:
    Harasim, Damian
    Cięszczyk, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2173905.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tilted Bragg grating
    optical fiber sensor
    polarization
    bending measurement
    Opis:
    The article shows the possibility of using TFBG gratings to measure the radius of curvature of fiber bending in conditions of variable polarization of the introduced light. Most of the modern, stable light sources generate light with a high degree of polarization. Due to the spatial asymmetry, the direction of the light polarization plane affects the spectral parameters of individual modes. For this reason, in the measurement systems using TFBGs presented so far it becomes necessary to determine and control the state of light polarization directly in front of the periodic structure. The article presents the determined spectral parameters of the cladding modes which allow bending measurements regardless of the direction of polarization of the introduced light. Thanks to this, the measuring system can be constructed without providing control of the introduced light polarization angle, which makes its construction simpler. When using TFBGs with an angle of 2°, the accuracy of determining the bending radius in the range from 15 mm to 30 mm when changing the angle of the plane of polarization in the full range is 0.318 mm in the case of changes in the transmission coefficient. For changes in the wavelength of the selected cladding mode, the accuracy is 0.3203 mm, with the input light polarization being changed in the range from 0° (P type) to 90° (S type).
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 4; 737--749
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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