Temat: coupled mode theory

Skocz do pozycji: 1.

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
Tematy:: YOFC single-mode fiber
helically twisted long-period fiber grating
fundamental mode
cladding mode
coupled mode theory; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2033950.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelowanie struktur światłowodowych siatek Bragga wykorzystywanych w układach czujnikowych
Modeling of the fiber Bragg grating structures used in sensing systems
Autorzy:: Wójcik, W.
Kisała, P.
Tematy:: światłowodowe siatki Bragga
teoria modów sprzężonych
czujniki optoelektroniczne
fiber Bragg gratings
coupled mode theory
optical fiber sensors; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/152208.pdf Link otwiera się w nowym oknie
Opis:: W pracy przedstawiono wyniki symulacji różnych siatek Bragga mających na celu określenie czy możliwe jest zastosowanie ich w układach czujnikowych, np. naprężeń. Autorzy opisali modele najczęściej produkowanych i wykorzystywanych obecnie siatek. Dla uzyskania ilościowych informacji o efektywności dyfrakcji i jej wpływie na charakterystyki widmowe siatki Bragga wykorzystana została teoria modów sprzężonych. Badania symulacyjne potwierdzono badaniami laboratoryjnymi.
The paper presents the simulation results of many different types of fiber Bragg gratings simulations. The FBG models chosen and presented in this article are the most common produced and used models. We used the coupled-mode theory for the quantitative information results about the grating diffraction efficiency and its influence on the FBG spectrum. Simulations are confirmed by the laboratory measurements.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Development of the Jackson and Hunt Theory for Rapid Eutectic Growth
Autorzy:: Wołczyński, W.
Tematy:: Jackson and Hunt theory
diffusion equation
coupled eutectic growth
Aziz’s theory
oscillatory mode of eutectic growth; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/353984.pdf Link otwiera się w nowym oknie
Opis:: A development of the Jackson-Hunt’s theory is delivered. Contrary to Jackson-Hunt’s theory for ideally coupled growth the current description is dealing with the coupled eutectic growth which is more realistic than an ideal course of eutectic structure formation. Thus, the undercooling of every eutectic phase is not equal to each other. A new boundary condition is introduced to solve the diffusion equation. According to this condition, the eutectic concentration is always maintained at the triple point of the solid / liquid (s/l) interface. Therefore, the solution to diffusion equation is given separately for both lamellae. The mass balance is satisfied by the current solution. Both thermodynamic equilibrium and mechanical equilibrium are assumed to be situated at the triple point of the s/l interface, only. A protrusion of the leading phase over the wetting phase is defined mathematically due to the mass balance fulfilment. The current description is associated with the asymmetrical phase diagrams. Finally, the current description is applied to interpretation of the rapid eutectic growth. Therefore, Aziz’s concept for the changes of partition ratio versus growth rate is introduced into the description. As a result, the rapid formation of the eutectic structure is described by the oscillatory mode. Interpretation of the oscillatory mode of the eutectic structure formation is illustrated in the arbitrary eutectic phase diagram. The eutectic structure, obtained through the detonation gas spraying onto the steel substrate (rapid solidification) is delivered to illustrate the present description.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Design and performance analysis of a mechanically coupled spring compliant to out-of-plane oscillation
Autorzy:: Nguyen, Duong Van
Nguyen, Chien Quoc
Dang, Hieu Van
Chu, Hoang Manh
Tematy:: coupled spring
mode coupling
serpentine spring
Sigitta spring theory
finite element
method
sprzężenie trybów
element końcowy
metoda; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/27309868.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a spring system symmetrically arranged around a circular plate compliant to out-of-plane oscillation is proposed. The spring system consists of single serpentine springs mutually coupled in a plane. Three theoretical mechanical models for evaluating the stiffness of the spring system are built, which are based on the flexural beam, Sigitta, and serpentine spring theories and equivalent mechanical spring structure models. The theoretically calculated results are in good agreement with numerical solutions using the finite element method, with errors less than 10% in the appropriate dimension ranges of the spring. Compared to similar spring structures without mechanical coupling, the proposed mechanically coupled spring shows advantage in suppressing the mode coupling.
Dostawca treści:: Biblioteka Nauki

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