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Wyświetlanie 1-15 z 44
Tytuł:
Propagation Characteristics of Bragg Fiber: Comparative Analysis using Two Approaches
Autorzy:
Kumar, Amit
Singh, M. P.
Powiązania:
https://bibliotekanauki.pl/articles/1075532.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Asymptotic Approximation
Bragg Fiber
Bragg reflection
propagation loss
Opis:
The propagation characteristics in air core Bragg fiber has been analyzed in this paper by using the two different approaches. Initially, we have computed the exact solution of Helmholtz equation and later the asymptotic limits have been used to calculate the propagation characteristics of TE modes in air core Bragg fiber. In last, we have compared the both results after mathematical computation and find excellent agreement between both approaches.
Źródło:
World Scientific News; 2019, 121; 6-13
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter comparison of fiber Bragg grating based optical wavelength discriminators
Autorzy:
Sikora, A.
Powiązania:
https://bibliotekanauki.pl/articles/114343.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fiber Bragg grain
FBG
chirped fiber Bragg grating
strain measurement
Opis:
Fiber Bragg gratings (FBGs) are widely used as temperature and strain measurement systems and in telecommunications systems. In order to simplify detecting the wavelength change (which is the output signal from FBB), fiber Bragg grating based optical wavelength discriminators can be used. In this paper, discriminators with apodized, chirped FBG cooperating with the identical grating of a sensor are considered. The analysis includes: the processing range (assuming the nonlinearity characteristic is less than 1%), the processing equation and the range of strain measurement. On the basis of simulation tests, there is discussed the influence of the following parameters: chirp value (Subsection 3.1), length (Subsection 3.2) and constant refractive index change averaged over the grating period (Subsection 3.3) of selected FBGs on the discriminator characteristic.
Źródło:
Measurement Automation Monitoring; 2016, 62, 8; 265-267
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Apodyzowane siatki Bragga o stałym okresie jako przetworniki odkształceń impulsowych. Analiza numeryczna
Apodized uniform fibre Bragg gratings as impulsive strain transducers. Numerical analysis
Autorzy:
Sikora, A.
Powiązania:
https://bibliotekanauki.pl/articles/153356.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
światłowodowa siatka Bragga
odkształcenie impulsowe
czujnik
fiber Bragg grating
fiber Bragg grating (FBG)
impulsive strain
sensor
Opis:
Artykuł dotyczy analizy wpływu długości apodyzowanych siatek równomiernych na dokładność przetwarzania odkształceń impulsowych o kształcie połowy sinusoidy. Nowością jest wykonanie tej analizy z jednoczesnym porównaniem wpływu wybranych profili apodyzacyjnych siatki równomiernej na dokładność tego przetwarzania. Przedstawiono wyniki obliczeń wybranych miar błędów dynamicznych. Na ich podstawie można stwierdzić, że wpływ profili apodyzacyjnych (w modelowanym zakresie) jest widoczny dla błędów czasu narastania i amplitudy, dla błędu średniokwadratowego jest nieznaczny.
The fibre Bragg gratings (FBG) are used in measurements as optical transducers which can also be used in high-frequency strain measurements [1, 2]. In such applications the output signal is distorted mainly due to the grating length [3, 4]. In order to select the proper grating length, the rise-time error (RTE, Fig. 2, Eq. 3), the amplitude error of the frequency change (AFCE, Fig. 2, Eq. 4) and the mean square error (MSE, Fig. 3, Eq. 5) were calculated. The calculations were carried out in several steps. In order to model the reflected grating power, the transfer matrix description [5] was used when taking into account the individual changes of parameters of each section of the grating (Eq. 1) [6]. The effective central fre-quency was assumed to be the grating output signal (Eq. 2)[7]. The dynamic errors were calculated [8] for a half sinusoidal (Eq. 8) impulsive strain waveform, and different apodization functions (raised-cosine profile Eq. 6, sinc Eq. 7) (Fig. 1) [9]. The results can be summarized in a conclusion: the calculated errors allow selecting the proper length of the fibre grating if the errors are established, and the waveform of the pulse is identified. The influence of the apodization function is observable for the RTE and AFCE, while for the MSE it is insignifi-cant.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 12, 12; 1436-1438
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of metrological properties fiber Bragg gratings with a constant and variable period
Analiza właściwości metrologicznych siatek Bragga ze stałym i zmiennym okresem
Autorzy:
Zieliński, T.
Kisała, P.
Powiązania:
https://bibliotekanauki.pl/articles/408901.pdf
Data publikacji:
2018
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
fiber Bragg grating (FBG)
optical sensor
uniform fiber Bragg grating
chirped fiber Bragg grating
światłowodowa siatka Bragga
czujnik optyczny
jednorodna światłowodowa siatka Bragga
chirpowa światłowodowa siatka Bragga
Opis:
The paper presents periodic structures in terms of metrological properties in the distinction for a fiber Bragg grating (FBG) with a constant and changeable period. The process of their formation and characteristics as well as applications in many areas have been described. On the basis of the literature, the results of research and measurements of measurable quantities such as temperature and stress made by periodic structures applied to the fiber of the optical fiber are presented. Analysis of the presented measurements allowed to mark the ranges and accuracy of measurements of individual applications.
W pracy przedstawiono struktury periodyczne pod kątem własności metrologicznych w rozróżnieniu na światłowodowe siatki Bragga (FBG – ang.: Fiber Bragg Grating) o stałym i zmiennym okresie. Opisano proces ich powstawania oraz cechy charakterystyczne jak i zastosowania w wielu dziedzinach. W oparciu o literaturę zaprezentowano wyniki badań i pomiarów takich wielkości mierzalnych jak temperatura i naprężenie dokonywanych strukturami periodycznymi naniesionymi na włókno światłowodu. Analiza zaprezentowanych pomiarów pozwoliła nakreślić zakresy oraz dokładności pomiarów poszczególnych aplikacji.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 2; 62-67
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental determination of the characteristics of a transmission spectrum of tilted fiber Bragg gratings
Autorzy:
Tolegenova, Akmaral
Kisała, Piotr A.
Zhetpisbayeva, Ainur
Mamyrbayev, Orken
Medetov, Bekbolat
Powiązania:
https://bibliotekanauki.pl/articles/221509.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical fiber
phase mask method
tilted fiber Bragg grating
Opis:
In this article, we study tilted fiber Bragg gratings (TFBGs) with tilt angles of 6°and 8°, their transmission spectra, and spectral parameters that have a linear dependence on the refractive index of the environment. It is shown that there can be several such characteristics, such as the minimum, width and energy of the spectrum. The linear dependence of the spectrum width on the refractive index does not depend on the tilt angle. The linear dependence of the spectrum minimum is only observed for a tilt angle of 8°. The results of this work can be used to create a sensor system based on an optical fiber.
Źródło:
Metrology and Measurement Systems; 2019, 26, 3; 581-589
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of cladding modes in SMF-28 fibers with TFBG structures
Autorzy:
Kisała, Piotr
Kalizhanova, Aliya
Kozbakova, Ainur
Yeraliyeva, Bakhyt
Powiązania:
https://bibliotekanauki.pl/articles/27311752.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
optical fiber sensors
tilted fiber Bragg gratings
optical measurements
Opis:
This article proposes an unequivocal method of labeling and numbering the cladding modes propagating in single-mode optical waveguides with tilted periodic structures. The unambiguous determination of individual propagating modes in this type of optical fiber is crucial for their use in sensory systems. The selection of the appropriate spectral range and mode determines the sensitivity and measuring range of tilted fiber Bragg grating (TFBG) sensors. The measurement methods proposed by individual research teams using TFBGs as transducers are usually based on the selection of specific modes. Unification of the labeling of modes and their numbering enables comparison of the basic metrological parameters of individual measurement methods and reproduction and verification of the proposed sensors and methods in the laboratories of other scientific and research centers.
Źródło:
Metrology and Measurement Systems; 2023, 30, 3; 507--518
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Performance for a Two Regions Superstructure Fiber Bragg Grating
Autorzy:
Khorsheed, Suha
Hemed, Ayser
Fdhala, Mayyada
Powiązania:
https://bibliotekanauki.pl/articles/1046553.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bragg wavelength
Fiber Bragg Grating
Mode Coupling Theory
Sensor
Superstructure
Opis:
A Superstructure Fiber Bragg Grating (SFBG) with a two grating regions has been studied experimentally and analytically. Both transmitted and reflected spectra for SFBG were investigated in a constant temperature (room temperature). Data that archived by Spectrometer & Detector was analyzed. In the same circumstances, a set of equations considered to simulate the experimental configuration. The SFBG spectrum characterized by important parameters: Bragg wavelength, bandwidth and efficiency. Bragg wavelength is very popular and has been used by the researchers to determine the physical quantities, it represent the reflected wavelength which satisfy Bragg condition. The behavior of these spectral parameters are presented and studied in this paper. The effect of grating region on the bandwidth and efficiency of SFBG was also studied. The SFBG has been found worked as a filter for the laser source wavelengths, which is used. Furthermore, this special FBG can be developed to optimize a sensor for temperature and pressure.
Źródło:
World Scientific News; 2019, 137; 42-57
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical foundations determining spectral characteristics measured in Bragg gratings subjected to bending
Autorzy:
Kisała, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2173892.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical fibers
tilted fiber Bragg grating
bending sensors
Opis:
The article presents an analysis of the impact of bending optical fibers with tilted Bragg gratings on their spectral parameters. This article proves that it is possible to a choose TFBG cladding mode and the optical spectrum range related to it that allows the best metrological properties to be obtained when measuring bend. The results contained in the paper explain why the minima in the spectral characteristics, corresponding only to some cladding modes, change their shape during TFBG bending, which is important for application of Bragg gratings as bending sensors. It has been presented that in the case of TFBG we are able to aggregate the knowledge obtained during experiment to the form of a physical model of the fiber bending sensor.
Źródło:
Metrology and Measurement Systems; 2022, 29, 3; 573--584
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of Strains with a Non-smooth Distribution and Temperature Using Optical Fiber Bragg Grating
Autorzy:
Detka, Małgorzata
Kaczmarek, Cezary
Powiązania:
https://bibliotekanauki.pl/articles/2124758.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fiber Bragg grating
non-smooth strain distribution
reflection spectrum
Opis:
This paper presents a simulation study of the simultaneous reconstruction of the non-smooth strain distribution of an optical fiber Bragg grating and its temperature, which is based on the reflection spectrum of the reflected beam of the grating. The transition matrix method was used to model the reflection spectrum of the grating, and the nonlinear NelderMead optimization method was used to simultaneously reconstruct the strain distribution along the grating and its temperature. The results of simulations of simultaneous reconstruction of the strain profile and temperature indicate good accord with the strain profiles and temperature set. The reconstruction errors of the strain profiles are less than 1.2 percent and the temperature change errors are less than 0.2 percent, with a noise level of 5 percent.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 535--540
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Fiber-Optic Sensors System, Based on Fiber Bragg Gratings
Autorzy:
Kalizhanova, Aliya
Kunelbayev, Murat
Wojcik, Waldemar
Kozbakova, Ainur
Aitkulov, Zhalau
Malikova, Feruza
Powiązania:
https://bibliotekanauki.pl/articles/2202138.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
fiber Bragg grating
sensor
deformation
temperature
modeling
MATLAB
Simulink
Opis:
An article herein considers the development of a fiber-optic sensor system, based on fiber Bragg gratings. Presently, fiber-optic sensors has become world-widely known amongst sensor technologies, used for monitoring engineering and construction structures. The work is linked with developing the system from fiber-optic sensors on the basis of fiber optic gratings, its characteristics, deformation behavior and temperature, acting at fiber Bragg grating by means of computer modeling. The research is focused at the analysis of characteristics and deformation and temperature behavior of fiber-optic Bragg sensor. Fiber-optic Bragg sensor with tilted grating is used for measuring deformation of the object, the strength of which is changed, dependent on the applied force, as well, for measuring and detecting any temperature deviations, influencing at fiber Bragg grating, which might bring to fire and accidents. In the research, simulation modeling there was made in the MATLAB (Simulink) software.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 98--106
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Possibilities for Using a Uniform Bragg Grating in a Tunable Dispersion Compensator
Autorzy:
Wójcik, W.
Kisała, P.
Yussupova, G.
Kussambayeva, N.
Kashaganova, G.
Harasim, D.
Powiązania:
https://bibliotekanauki.pl/articles/226954.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dispersion compensation
group delay
fiber Bragg gratings
tunable dispersion compensator
Opis:
The article presents a tunable fibre optic dispersion compensator system, consisting of a specially designed cantilever beam and a uniform Bragg grating. It analyses the group delay and dispersion characteristics in the case that there is no apodization of the grating and also for a grating with apodization used for modulation of the refractive index. Various apodization parameters were tested, along with their effects on the dispersion characteristics of the entire system properties. It is demonstrated in the paper that the apodization parameter affects the compensator’s group delay characteristic. The finite elements method was used to design a compensator of such a shape that enabled chirp to be induced in a grating of a specified shape. A new design is presented for the system, in which the dispersion properties are tuned by the maximum value of the heterogeneous deformation of the compensator. The paper also includes results showing the effect of the maximum value of heterogeneous stress of the grating on the dispersion characteristics of the proposed construction.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 4; 381-387
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed strain reconstruction based on a fiber Bragg grating reflection spectrum
Autorzy:
Detka, M.
Kaczmarek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/220892.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fiber Bragg grating (FBG)
synthesis
distributed sensing
transfer matrix method
Opis:
In this paper, we present a synthesis of the parameters of the fiber Bragg grating (FBG) and the reconstruction of the distributed strain affecting the grating, performed by means of its reflection spectrum. For this purpose, we applied the transition matrix method and the Nelder-Mead nonlinear optimization method. Reconstruction results of the strain profile carried out on the basis of a simulated reflection spectrum as well as measured reflection spectrum of the FBG indicate good agreement with the original strain profile; the profile reconstruction errors are within the single digit percentage range. We can conclude that the Nelder-Mead optimization method combined with the transition matrix method can be used for distributed sensing problems.
Źródło:
Metrology and Measurement Systems; 2013, 20, 1; 53-64
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing
Autorzy:
Li, Hong
Zhang, Haoyue
Song, Yanming
Meng, Fanyong
Zhu, Lianqing
Powiązania:
https://bibliotekanauki.pl/articles/2033955.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fiber Bragg grating
cross-sensitivity
double peaks
surface pasting
curing
Opis:
A novel technology for the simultaneous and independent measurement of dual parameters is proposed and experimented. By using a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing conditions, the sensor structure is designed such that the reflective single-peak spectrum splits into a twin-peak spectrum, which makes the FBG spectrum form a natural spectral peak splitting bias. A measurement limitation exists in the FBG sensor packaging at room temperature, which can be solved by the high-temperature cured packaging method. To verify the validity of the theory and methodology, the experimental system is used. In the range from –1000 to +1000 με and from 35 to 75°C, the Bragg wavelength change is relative linear to the strain and temperature. The temperature and strain variations can be independently and simultaneously measured using the split peak, and the deviations of the FBG sensor are ±1°C and ±5 με, respectively. This single FBG sensor can realize dual-parameter measurement, which is valuable for narrow-space health monitoring.
Źródło:
Optica Applicata; 2021, 51, 3; 391-406
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion-compensating en/decoder for a time-spreading/wavelength-hopping optical code-division multiplexing (OCDM) system
Autorzy:
Zheng, J.
Wang, R.
Pu, T.
Lu, L.
Fang, T.
Su, Y.
Li, L.
Yang, Q.
Chen, X.
Powiązania:
https://bibliotekanauki.pl/articles/174365.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical code-division multiplexing (OCDM)
fiber Bragg grating (FBG)
dispersion
Opis:
A novel dispersion-compensating fiber Bragg grating (FBG)-based en/decoder is proposed to compensate both the out-band and in-band dispersion in a time-spreading/wavelength-hopping (TS/WH) optical code-division multiplexing (OCDM) system. The experimental realization of such en/decoders only needs a uniform-pitch phase mask and a sub-micrometer precision moving stage. Such an en/decoder pair with the ability of compensating the dispersion of transmission in 20-km single mode fiber (SMF) is simulated and experimentally fabricated. Both the simulation and experimental results show that the decoded pulse can be recovered without any distortion owing to the elimination of dispersion.
Źródło:
Optica Applicata; 2013, 43, 3; 485-495
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demarcation energy properties of regenerated fiber Bragg grating sensors in few-mode fibers
Autorzy:
Mohd Nazal, N. A.
Lai, M.-H.
Lim, K.-S.
Gunawardena, D. S.
Chong, W.-Y.
Yang, H.-Z.
Ahmad, H.
Powiązania:
https://bibliotekanauki.pl/articles/174756.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
regenerated fiber Bragg grating
thermal regeneration
thermal decay
few-mode fibers
Opis:
In this work, thermal regeneration of fiber Bragg gratings inscribed in single-mode fibers, two-mode step index fibers and four-mode step index fibers is performed, where the single-mode fibers are used as the reference in the analysis. Specifically, we investigate the behavior of the thermal decay, recovery and eventually the permanent erasure of the gratings in the temperature range from 25 to 1300°C. In the domain of demarcation energy, the thermal responses of the gratings can be normalized and they share similar characteristic curves despite the different temperature ramping rates used in the annealing treatment. It is found that the demarcation energy at the regeneration point and the attempt-to-escape frequency for each grating can be associated with the confinement factors of the fibers. The finding in this work has provided a new insight in the manufacture of regenerated fiber Bragg grating sensors by using few-mode fibers for multiparameter sensing in high temperature environments.
Źródło:
Optica Applicata; 2018, 48, 2; 263-271
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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