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    Wyświetlanie 1-4 z 4
    Tytuł:
    Tuning transfer function of fiber-optic Fabry–Pérot interferometer via introduction of birefringence in the cavity
    Autorzy:
    Hirsch, Marzena
    Wierzba, Paweł
    Jędrzejewska-Szczerska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/174917.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fiber optic interferometer
    birefringence
    fiber optic sensors
    Fabry-Perot interferometer
    Opis:
    The study investigates the impact of birefringence exhibited by the cavity material of a fiber-optic Fabry–Pérot interferometer on its transfer function. The theoretical approach to analyze the effect of birefringence in the cavity of a plane Fabry–Pérot interferometer is described. The case of high- and low-finesse interferometer is investigated. It is shown that introduction of a birefringent medium of optimized parameters can be used to increase the density of interference fringes in certain wavelength range – the feature can be used either for reduction of the cavity length in an interferometric sensor or operation with sources of narrower spectral characteristics.
    Źródło:
    Optica Applicata; 2019, 49, 2; 241-248
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of glistening and calcium deposits in artificial intraocular lenses on retinal image quality – numerical model
    Autorzy:
    Geniusz, M.
    Zajac, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173584.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    intraocular lens (IOL)
    glistenings
    modulation transfer function
    MTF
    calcium deposits
    Opis:
    In modern ophthalmology the natural eye lens is sometimes replaced with an artificial implant – intraocular lens which remains in the eye for a long time. This can lead to the formation of numerous microdefects occurring on the intraocular lens surface or inside its volume. The most common include calcium deposits or microvacuoles referred to as glistenings. The presence of those defects causes deterioration of retinal image thus lowering the quality of vision. The purpose of this research is to develop a numerical model of human eye with intraocular lens burden with defects useful to predict the impact of calcium deposits and glistenings on the retinal image quality. The calculations made in accordance with this model suggest that the quality of retinal image deteriorates when the density of defects increases, but the degree of image deterioration does not depend on the location of the defects and transmittance of individual particles. The main deterioration effect is observed for low spatial frequencies (< 12 cycles/deg) both in case of calcium deposits and glistenings while for the spatial frequency of 30 cycles/deg the changes in modulation transfer function are insignificant. The presence of microvacuoles in the intraocular lens influences the worsening of modulation transfer function parameters only for the diameter of microvacuoles greater than 10 μm.
    Źródło:
    Optica Applicata; 2017, 47, 3; 341-350
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A semi-analytic approach to calculating the Strehl ratio for a circularly symmetric system. Part 1: static wavefront
    Autorzy:
    Castaño-Fernandez, A. B.
    Martínez-Finkelshtein, A.
    Iskander, D. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/174316.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    image quality assessment
    optical transfer function
    mathematical methods in physics
    finite analogs of Fourier transforms
    Opis:
    Close-form expression for the Strehl ratio calculated in the spatial frequency domain of the optical transfer function (SOTF) is considered for the case of an optical system that has circular symmetry. First, it is proved that the SOTF for the aberration-free diffraction limited optical system is equal to one. Further, a semi-analytic solution for the SOTF for a system described by the second (defocus) and the fourth (spherical) order aberrations is provided. It is shown that the proposed semi-analytical solution is of an order of a magnitude computationally more efficient than the commonly used approach based on the discrete Fourier transformation.
    Źródło:
    Optica Applicata; 2018, 48, 2; 201-210
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A semi-analytic approach to calculating the Strehl ratio for a circularly symmetric system.Part 2: dynamic wavefront
    Autorzy:
    Castaño-Fernandez, A. B.
    Martínez-Finkelshtein, A.
    Iskander, D. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/173593.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    image quality assessment
    optical transfer function
    longitudinal vibrations
    mathematical methods in physics
    finite analogs of Fourier transforms
    Opis:
    Close-form expression for the Strehl ratio calculated in the spatial frequency domain of the optical transfer function (SOTF) is considered for the case of time-varying dynamic optical system that has circular symmetry. Specifically, closed-form expressions for the temporally averaged SOTF are considered, which can be easily evaluated numerically (what we call a semi-analytic solution). As for the case of a static wavefront, described in Part 1 of this work, it is shown that the proposed methods are computationally more efficient than the commonly used approach based on the discrete Fourier transform.
    Źródło:
    Optica Applicata; 2018, 48, 2; 211-223
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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