Temat: 43.20.Wd - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Acousto-Electromagnetic Analogies in Diffraction Phenomena Occurring in the Semi-Infinite Cylindrical Waveguide
Autorzy:: Snakowska, A.
Powiązania:: https://bibliotekanauki.pl/articles/1807756.pdf
Data publikacji:: 2009-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 41.20.Jb
43.20.Wd
Opis:: The paper presents analogies between acoustic and electromagnetic wave field occurring in limited areas, such as waveguides, when electromagnetic waves are not purely transversal. The acousto-electromagnetic analogies exist in structures such as plane, rectangular or cylindrical infinite waveguides, if the fields are analysed by means of potentials - the velocity potential for sound waves and the Hertz potentials for electromagnetic waves. It has been demonstrated why these analogies between the potentials representing solutions of the wave equation with adequate boundary conditions and expressed as sums of admissible duct modes do fail, in general, for the semi-infinite cylindrical duct, and why they remain valid when the propagating electromagnetic mode is axisymmetric.
Źródło:: Acta Physica Polonica A; 2009, 116, 3; 410-413
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Accuracy Improvement of a Photoacoustic Helmholtz Cell Model
Autorzy:: Suchenek, M.
Opalski, L.
Powiązania:: https://bibliotekanauki.pl/articles/1198566.pdf
Data publikacji:: 2014-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.20.Ks
43.20.Wd
43.30.Zk
43.38.Zp
Opis:: This paper presents a method for improving accuracy of the frequency response of a photoacoustic Helmholtz cell model. The method generates simple non-linear corrections to well-established (reference) delay line model of the cell. The form of the correction functions is obtained from a study of a numerical fitting of the reference model to the measurement data. A novel integral accuracy measure is formulated to compare fit of cell models to actual measurements in the neighborhood of the resonance frequency, which is important for measurement applications of the cell. The two proposed correction functions modify effective values of duct parameters. Despite simplicity the proposed corrections make significant improvement of modeling accuracy, as shown with the integral measure but also with prediction accuracy of the resonance frequency and the cell quality factor. It is significant that substantial accuracy gain due to the corrections was confirmed with measurements of a second (testing) set of photoacoustic Helmholtz cells with geometrical parameter values which are different from these of the first set.
Źródło:: Acta Physica Polonica A; 2014, 125, 5; 1132-1137
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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