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    Wyświetlanie 1-6 z 6
    Tytuł:
    Application of non-contact ultrasonic method in air to study fiber-cement corrugated boards
    Autorzy:
    Drelich, Radosław
    Rosiak, Michał
    Pakula, Michał
    Tematy:
    Lamb waves
    cellulose fiber cement boards
    non-contact ultrasonic methods
    fale Lamba
    płyta celulozowo-cementowa
    metody ultradźwiękowe bezkontaktowe
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/2128140.pdf  Link otwiera się w nowym oknie
    Opis:
    The fiber-cement and cellulose boards are materials commonly used in architectural engineering for exterior and interior applications such as building facades or as wall and roof covering materials. The aim of the study was to present the ultrasonic non-contact method of testing fiber-cement boards with Lamb waves and to discuss the results and limitations of the method in context of quality control of the material. The experiments were performed for the corrugated boards using a laboratory non-contact ultrasonic scanner. Lamb waves were generated in the tested materials by a transmitter excited by a chirp signal with a linearly modulated frequency. Waves transmitted through the tested material are acquired by the receiver and registered by the PC based acquisition system. The tests were done on reference plate board and the corrugated boards. As the main descriptor to assess the quality of tested boards the maximum amplitude of transmitted Lamb waves was selected. The significant role of boundary effects and frequency of waves was noticed. The obtained results have confirmed the usefulness of the applied ultrasonic method for testing macroscopic inhomogeneity of corrugated fiber-cement boards.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of non-contact ultrasonic method in air to study fiber-cement corrugated boards
    Autorzy:
    Drelich, Radosław
    Rosiak, Michał
    Pakula, Michał
    Tematy:
    Lamb waves
    cellulose fiber cement boards
    non-contact ultrasonic methods
    fale Lamba
    płyta celulozowo-cementowa
    metody ultradźwiękowe bezkontaktowe
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/2173608.pdf  Link otwiera się w nowym oknie
    Opis:
    The fiber-cement and cellulose boards are materials commonly used in architectural engineering for exterior and interior applications such as building facades or as wall and roof covering materials. The aim of the study was to present the ultrasonic non-contact method of testing fiber-cement boards with Lamb waves and to discuss the results and limitations of the method in context of quality control of the material. The experiments were performed for the corrugated boards using a laboratory non-contact ultrasonic scanner. Lamb waves were generated in the tested materials by a transmitter excited by a chirp signal with a linearly modulated frequency. Waves transmitted through the tested material are acquired by the receiver and registered by the PC based acquisition system. The tests were done on reference plate board and the corrugated boards. As the main descriptor to assess the quality of tested boards the maximum amplitude of transmitted Lamb waves was selected. The significant role of boundary effects and frequency of waves was noticed. The obtained results have confirmed the usefulness of the applied ultrasonic method for testing macroscopic inhomogeneity of corrugated fiber-cement boards.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technology and research on the influence of liquid crystal cladding doped with magnetic Fe3O4 nanoparticles on light propagation in an optical taper sensor
    Autorzy:
    Niewczas, Michał
    Kula, Przemysław
    Jaroszewicz, Leszek R.
    Dziaduszek, Jerzy
    Paczesny, Jan
    Przybysz, Natalia
    Pakuła, Anna
    Zbonikowski, Rafał
    Stasiewicz, Karol A.
    Wydawca:
    Frontiers Media
    Cytata wydawnicza:
    Niewczas M, Stasiewicz KA, Przybysz N, Pakuła A, Paczesny J, Zbonikowski R, Dziaduszek J, Kula P and Jaroszewicz LR (2024), Technology and research on the influence of liquid crystal cladding doped with magnetic Fe3O4 nanoparticles on light propagation in an optical taper sensor. Adv. Opt. Technol. 13:1422695. doi: 10.3389/aot.2024.1422695
    Opis:
    The results obtained for new dual-cladding optical fiber tapers surrounded by liquid crystal (LC) doped with Fe3O4 nanoparticles in a specially developed glass cell are presented. The created structures are sensitive to changes in refractive index values in the surrounding medium caused by modifying external environment parameters. In this investigation, cells are filled with nematic LCs 6CHBT and with the same mixture doped with 0.1 wt% and 0.5 wt% of magnetic nanoparticles (Fe3O4 NPs). The taper is made on a standard single-mode telecommunication fiber, stretched out to a length of 20.0 ± 0.5 mm, and the diameter of the tapers is approximately 15.0 ± 0.3 μm, with a loss lower than 0.5 dB @ 1,550 nm. Measurements are carried out in a wide range covering the visible and infrared ranges in two setups: 1) without a magnetic field, with steering only by voltage and 2) with an applied magnetic field. The presented spectrum results are divided into two ranges according to the parameters of optical spectrum analyzers: 350–1,200 nm and 1,200–2,400 nm. For all investigations, a steering voltage is chosen from the range of 0 to 200 V, which allows for establishing the influence of dopants on transmitted power and time response at different arrangements. Due to the sensitivity of LCs to temperature changes, this paper focuses on measuring at room temperature the effect of the magnetic field on propagation in a fiber optic taper. The proposed solution demonstrates the technology for creating advanced components as a combination of fiber optic technology, LCs, and nanoparticles. The presented results show the possibility of creating new sensors of various external factors such as magnetic or electric fields in miniaturized dimensions.
    This work was supported by the Program of the Republic of Poland—Research Grant MUT project no UGB 22-725. Works done by JP and RZ were supported by the National Science Center, Poland, within grant OPUS 2019/35/B/ST5/03229.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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