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    Wyświetlanie 1-6 z 6
    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
    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:
    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:
    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:
    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:
    The study of temperature measurement based on the transmission of fixed wavelengths for helical long-period grating
    Autorzy:
    Bai, Yunfeng
    He, Zelong
    Dang, Suihu
    Powiązania:
    https://bibliotekanauki.pl/articles/2060686.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    helical long-period grating
    fixed wavelength
    dual-wavelength ratio
    temperature sensor
    Opis:
    This research involves a fixed wavelength and dual-wavelength ratio temperature measurement for helical long-period grating. There are two resonant dips near 1475 and 1520 nm, with the pitch length 782 μm. The temperature sensitivity of resonance wavelengths is about 0.06 nm/°C. Both theoretical simulation and experiment results show that the transmission of a fixed wavelength linearly changes with the temperature. It has a high application value for measuring temperature. Besides, the dual-wavelength ratio is studied to eliminate the influence of light source. The temperature sensitivity of transmission intensity ratio of I1469.6nm/I0 and I1469.6nm/I1526.5nm are about 1.0076/°C and 0.0155/°C, respectively, so the dual-wavelength ratio is more practical. And the 0.0155 times intensity change could be much more easily measured than the 0.06 nm wavelength change for each degree Celsius. So the dual-wavelength ratio of the helical long-period gratings is very suitable for temperature sensors.
    Źródło:
    Optica Applicata; 2022, 52, 1; 129--137
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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