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    Wyświetlanie 1-5 z 5
    Tytuł:
    Identification of cladding modes in SMF-28 fibers with TFBG structures
    Autorzy:
    Kisała, Piotr
    Kalizhanova, Aliya
    Kozbakova, Ainur
    Yeraliyeva, Bakhyt
    Powiązania:
    https://bibliotekanauki.pl/articles/27311752.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    optical fiber sensors
    tilted fiber Bragg gratings
    optical measurements
    Opis:
    This article proposes an unequivocal method of labeling and numbering the cladding modes propagating in single-mode optical waveguides with tilted periodic structures. The unambiguous determination of individual propagating modes in this type of optical fiber is crucial for their use in sensory systems. The selection of the appropriate spectral range and mode determines the sensitivity and measuring range of tilted fiber Bragg grating (TFBG) sensors. The measurement methods proposed by individual research teams using TFBGs as transducers are usually based on the selection of specific modes. Unification of the labeling of modes and their numbering enables comparison of the basic metrological parameters of individual measurement methods and reproduction and verification of the proposed sensors and methods in the laboratories of other scientific and research centers.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 3; 507--518
    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:
    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:
    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:
    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 1-5 z 5

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