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    Wyświetlanie 1-8 z 8
    Tytuł:
    A generic method to realize long fibers filled and large polymer parts in additive manufacturing
    Autorzy:
    Hascoët, Jean-Yves
    Authelin, Olivier
    Rauch, Matthieu
    Powiązania:
    https://bibliotekanauki.pl/articles/99691.pdf
    Data publikacji:
    2020
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    robotized additive manufacturing
    long fiber
    filled polymers
    fused filament fabrication
    Opis:
    A general manufacturing methodology for long fibers filled and large polymer (LFFLP) parts will be proposed, which constitutes the major scientific contribution of the document. The input, output, control and analysis data at each step of the methodology will be specified. Experiments realized in the laboratory of Ecole Centrale de Nantes will demonstrate the relevance and effectiveness of this method applied to a 6-axis robot and the FFF process by showcasing two light and resistant lattice structures. The latter also highlight the capacity of 6-axis robots for orienting the deposition head in order to generate complex trajectories. Finally, perspectives and future research about this subject will be discussed such as the need to develop in-depth analyses of the manufacturing methodology. The possibility of using continuous fibres composites as material feedstock for robotized large dimensions FFF will also be covered.
    Źródło:
    Journal of Machine Engineering; 2020, 20, 1; 107-116
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    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:
    Strain measurement based on fixed wavelength transmission of tapered long-period fiber grating
    Autorzy:
    Tang, Yong
    Zhang, Hao
    Zhang, Li
    Yu, Xin Feng
    Bai, Yun Feng
    Powiązania:
    https://bibliotekanauki.pl/articles/2172862.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tapered fiber
    long-period fiber
    fiber grating
    strain sensor
    fixed dual-wavelength ratio
    Opis:
    This paper studies the relationship between transmission intensity and strain based on tapered long-period fiber grating at a fixed wavelength. In experiments, tapered long-period fiber grating was prepared by the electric melting method. Experimental results show that two resonance peaks appeared at 1482 and 1537 nm, respectively. Here is the elaboration of the relationship between the resonant wavelength and the strain, its wavelength-strain sensitivity is 20 pm/με, and the linearity was negative. Then our next study was about the relationship between transmission intensity and strain at a fixed wavelength. The results show that the transmission intensity at a fixed wavelength is related to the exponent with strain. The coupled-mode theory is applied to simulate the relationship between fixed wavelength and strain. The simulation results matched the experimental results. Two fixed wavelength transmission intensity ratio was used, and the ratio showed a linear relationship with the strain, and the slope is –0.018 dB/με. Therefore, within the 0.01% resolution of our detector, we could resolve a 0.16 με strain change. We can select the appropriate light source and detector to achieve higher measurement accuracy. Thus, there is a great potential in fiber grating strain sensors.
    Źródło:
    Optica Applicata; 2022, 52, 4; 511--519
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Helically twisted long-period fiber gratings of YOFC single-mode fiber with optical fiber welding machine
    Autorzy:
    Bai, Yunfeng
    He, Zelong
    Bai, Jiyuan
    Dang, Suihu
    Powiązania:
    https://bibliotekanauki.pl/articles/2033950.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    YOFC single-mode fiber
    helically twisted long-period fiber grating
    fundamental mode
    cladding mode
    coupled mode theory
    Opis:
    The single-mode fiber provided by YOFC inc is employed for spiral processing by commercial welding machine. It can clearly see the periods structure under the light, but there is no obvious deformation of the fiber core, cladding and surface morphology under a microscope. There is an obvious resonant peak near 1560 nm, half peak width is about 25 nm, the depth of the resonant peak closed to –26 dB, when the period is about 411 μm. It agrees with theoretical calculation results according to the long-period fiber grating coupled-mode theory. The resonance wavelength is caused by coupling between the fundamental mode and the LP14 mode. The responsivities of the helically twisted long-period fiber gratings (H-LPFG) for the temperature is measured, the resonance wavelength is linear with temperature, the slope is 86 pm/°C. Because it is easy to inscribe by commercial welding machine, and has a strong resonance peak, it has potential applications as the temperature sensor.
    Źródło:
    Optica Applicata; 2021, 51, 3; 407-413
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    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:
    Fiber Bragg grating-based high temperature sensor and its low cost interrogation system with enhanced resolution
    Autorzy:
    Mamidi, V R
    Kamineni, S
    Ravinuthala, L N S P
    Madhuvarasu, S S
    Thumu, V R
    Pachava, V R
    Putha, K
    Powiązania:
    https://bibliotekanauki.pl/articles/949414.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fiber Bragg grating (FBG)
    long period grating
    fiber optic temperature sensor
    optical intensity modulation
    Opis:
    A fiber Brag grating-based high temperature sensor together with a low cost, high speed and compact size interrogation system using a long period grating was designed, developed and tested. The designed sensor measures the temperature from room temperature to 550 °C. The sensor head was configured by encapsulating an fiber Brag grating (type-I) of Bragg resonance wavelength at 1552.88 nm in a capillary tube made of copper. Long period grating with peak transmission loss at 1550 nm was employed to convert the wavelength information from fiber Brag grating into an intensity modulated signal. Temperature related optical intensity information was again converted into its equivalent electrical signal by using a photodiode. The achieved resolution of the sensor was found to be 0.5 °C.
    Źródło:
    Optica Applicata; 2014, 44, 2; 299-308
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Rheological Properties of Cement Composites Based on Waste Materials
    Autorzy:
    Zakrzewski, Mateusz
    Domski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/27322945.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    cement composites
    creep
    steel cord
    fiber-reinforcement concrete
    long-term study
    concrete beams
    waste aggregate
    waste fibers
    crack
    Opis:
    This report presents the results and analysis of long-term properties of fiber-reinforced cement composite based on waste aggregate. The long-term tests were carried out on the stand proposed by the authors for simultaneously testing three beams with dimensions of 100x200x2900 mm. A total of 8 mixtures of cement composites with aggregate from ceramic waste and waste sand were tested. Three beams were made for each mixture. One without dispersed reinforcement and two with 0.5% and 1.0% fiber reinforcement ratios. As dispersed reinforcement, steel cord and hooked steel fibers were used. The beams were subjected to a four-point bending test. The research was carried out for 1000 days. An optical system was used as an innovative solution in long-term research. Based on the measurements, the creep coefficient in the mid-span of the beams was determined, and the crackings of the beams were analysed. The results obtained using manual measuring devices and the optical system were compared. A good convergence of measurement methods was observed. During the analysis of the results, the coefficients modifying the method for calculating the crack width included in Eurocode 2 were determined.
    Źródło:
    Rocznik Ochrona Środowiska; 2023, 25; 159--173
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of producing apodized fiber Bragg gratings and examples of their applications
    Metody wytwarzania i zastosowanie apodyzowanych siatek Bragga
    Autorzy:
    Zychowicz, Ł.
    Klimek, J.
    Kisała, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/408706.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    apodized fiber Bragg grating
    uniform Bragg grating
    chirped Bragg grating
    long-period grating
    blazed Bragg grating
    apodyzowane siatki Bragga
    równomierna siatka Bragga
    siatka Bragga o zmiennym okresie
    siatka długookresowa
    skośna siatka Bragga
    Opis:
    The paper presents the principle of operation, the structure, applications and methods of producing uniform, chirped and blazed fiber Bragg gratings as well as long period gratings. Finally, several selected methods used to make apodized gratings are listed and described.
    W artykule omówiono zasadę działania, budowę i zastosowania apodyzowanych siatek Bragga: równomiernych, o zmiennym okresie, długookresowych i skośnych oraz wpływ apodyzacji na te siatki. Na koniec wymieniono i opisano kilka wybranych metod stosowanych do wytworzenia apodyzowanych siatek.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 1; 60-63
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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