Temat: Bragg reflection - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Efficiency of Ultrasonic Comb Transducers
Autorzy:: Danicki, E. J.
Powiązania:: https://bibliotekanauki.pl/articles/176949.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultrasonic transducers
interface waves
Bragg reflection
Opis:: Comb transducers are applied in ultrasonic testing for generation of Rayleigh or Lamb waves by scattering of the incident bulk waves onto surface waves at the periodic comb-substrate interface. Hence the transduction efficiency, although rarely discussed in literature, is an important factor for applications determining the quality of the measured ultrasonic signals. This paper presents the full-wave theory of comb transducers concluded by evaluation of their efficiency for a couple of examples of standard and certain novel configurations.
Źródło:: Archives of Acoustics; 2011, 36, 4; 887-900
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

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

Skocz do pozycji: 3.

Tytuł:: Rayleigh Waves in an isotropic Body with Deep Periodic Grooves
Autorzy:: Danicki, E.
Powiązania:: https://bibliotekanauki.pl/articles/178010.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: surface acoustic waves
Bragg reflection
comb transducers
Opis:: Bragg scattering of waves propagating in a periodically disturbed substrate is widely applied in optics and micro-acoustic systems. Here, it is studied for Rayleigh waves propagating on a periodically grooved elastic substrate. Practically applied groove depth in the Bragg grating reflectors does not exceed a few percent of the Rayleigh wavelength. Here, the analysis is carried out for periodic grooves of larger depth by applying the elastic plate model for the groove walls. The computed results show that the surface wave existence and reflection depends strongly on both the groove depth and period, and that there are limited domains of both for practical applications, primarily in comb transducers of surface waves.
Źródło:: Archives of Acoustics; 2010, 35, 1; 67-74
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

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

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