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    Wyświetlanie 1-4 z 4
    Tytuł:
    Rotation and twist measurement using tilted fibre Bragg gratings
    Autorzy:
    Kisała, P.
    Skorupski, K.
    Cięszczyk, S.
    Panas, P.
    Klimek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221822.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photonic sensors
    fibre Bragg gratings
    twist measurements
    rotation measurements
    Opis:
    The paper presents a method of measuring the angle of rotation and twist using a tilted fibre Bragg grating (TFBG) periodic structure with a tilt angle of 6°, written into a single-mode optical fibre. It has been shown that the rotation of the sensor by 180° causes a change in the transmission coefficient from 0.5 to 0.84 at a wavelength of 1541.2 nm. As a result of measurements it was determined that the highest sensitivity can be obtained for angles from 30° to 70° in relation to the basic orientation. The change in the transmission spectrum occurs for cladding modes that change their intensity with the change in the polarization of light propagating through the grating. The same structure can also be used to measure the twist angle. The possibility of obtaining a TFBG twist by 200° over a length of 10 mm has been proved. This makes it possible to monitor both the angle of rotation and the twist of an optical fibre with the fabricated TFBG.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 429-440
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological conditions of strain measurement optoelectronic method by the use of the fibre Bragg gratings
    Autorzy:
    Kisała, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221753.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optoelectronic measurement methods
    strain measurements
    temperature insensitive
    fibre Bragg gratings
    Opis:
    This article presents a linear strain measurement method insensitive to temperature variations and using fibre Bragg gratings. Two Bragg gratings were applied with periods selected to obtain partial coverage of their spectrum characteristics. One of the gratings was subjected to a tension strength. Placing both gratings in one thermal chamber allowed - through ensuring the same thermal conditions - to obtain insensitivity of the entire scheme to temperature variations. The gratings were recorded on the same optical fibre and reacted to temperature variations in the same degree. Value of strain was indicated based on the transmission spectrum characteristic of two grating schemes. The use of transmission, not reflectance, characteristics of the gratings allowed for a direct measurement of the spectrum, without having to use a coupler or optical circulators, and at the same time, this allowed to simplify the strain detection scheme. We proposed applying the continuous wavelet transform with characteristics of the spectrum scheme of two gratings for improvement of static properties. Especially, the thermal linearity and stability of the sensor was improved. For a strain range up to 750 με, the non-linearity error of processing characteristic obtained was 0.45%. Thermal stability of the scheme proposed was defined as relative sensitivity of the power to temperature variations. The mean value of such relative sensitivity of the scheme proposed in the temperature scope of 21°C-95°C, amounted to 0.195.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 3; 471-480
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of a zone chirp in uniform Bragg grating as a way of obtaining double functionality of a sensor
    Autorzy:
    Kisała, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221165.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fibre Bragg gratings
    strain and temperature sensor
    temperature-insensitive measurement method
    Opis:
    This paper presents a method of using a sensor with uniform Bragg grating with appropriately generated zone chirp. The presented method can be used for measuring two physical quantities, namely strain and temperature. By providing the same temperature sensitivity and different sensitivity to strain of two parts of a sensor, and experimental measurement of qualities of the proposed system and its calibration (experimental determination of sensitivity), verification of the results obtained from laboratory tests and the possibility of its practical implementation has been confirmed. The sensor grating was placed in such a way that its half was in the zone of a variable value of axial strain caused by changes of the cross-section of the sample. The other half, however, was in the zone of a constant cross-section of the sample and of constant value of strain, caused by the force stretching the sample. The obtained errors of non-linearity of processing characteristics for measuring strain and temperature of the proposed system were 2.7% and 1.5% respectively, while coefficients of sensitivity to strain and temperature were 0.77 x 10-6 m/e and 4.13 x 10-12 m/K respectively. The maximum differences between the values obtained from the indirect measurement and the set values were 110 žε for strain and 3.8°C for temperature, for a strain of 2500 žε and a temperature of 40°C.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 727-738
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fibre optic Bragg structures with monotonic apodisation characteristics
    Światłowodowe struktury Bragga o monotonicznej charakterystyce apodyzacji
    Autorzy:
    Klimek, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2070254.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    apodised Bragg gratings
    optical fibre sensor
    FBG
    CFBG
    apodyzowane siatki Bragga
    czujniki światłowodowe
    Opis:
    The article discussesthe principle of operation and the structure of chirped and uniformgratings. It presents the method of producing gratings with monotonic apodisation characteristics, and compares the spectral features of produced gratings with the those obtained by mathematical modelling.
    W artykule omówiono zasadędziałania i budowę siatek chirpowych oraz siatek jednorodnych., przedstawiono sposób wytwarzania siateko monotonicznej charakterystyce apodyzacji, porównano charakterystyki spektralne siatek wytworzonych z charakterystykami uzyskanymi metodą modelowania matematycznego.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2021, 11, 4; 42--46
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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