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    Wyświetlanie 1-5 z 5
    Tytuł:
    Wideband spectral emission measurements from laser-produced plasma EUV/SXR source based on a double gas puff target
    Autorzy:
    Arikkatt, Antony Jose
    Wachulak, Przemysław
    Fiedorowicz, Henryk
    Bartnik, Andrzej
    Czwartos, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1849155.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Plasma Spectroscopy
    X-ray coherence tomography
    soft X-ray
    Opis:
    We present spectral emission characteristics from laser-plasma EUV/SXR sources produced by irradiation of < 1 J energy laser pulse on eleven different double stream gas puff targets, with most intense electronic transitions identified in the spectral range from 1 nm to 70 nm wavelength which corresponds to photon energy from 18 eV to 1240 eV. The spectra were obtained using grazing incidence and transmission spectrographs from laser-produced plasma emission, formed by the interaction of a laser beam with a double stream gas puff target. Laser pulses with a duration of 4 ns and energy of 650 mJ were used for the experiment. We present the results obtained from three different spectrometers in the wavelength ranges of SXR (1-5.5 nm), SXR/EUV (4-15.5 nm), and EUV (10-70 nm). In this paper, detailed information about the source, gas targets under investigation, the experimental setup, spectral measurements and the results are presented and discussed. Such data may be useful for the identification of adequate spectral emissions from gasses in the EUV and SXR wavelength ranges dedicated to various experiments (i.e. broadband emission for the X-ray coherence tomography XCT) or may be used for verification of magnetohydrodynamic plasma codes.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 4; 701-719
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of retina vessels by segmentation of images reconstructed from optical coherence tomography data
    Autorzy:
    Marciniak, Tomasz
    Stankiewicz, Agnieszka
    Dąbrowski, Adam
    Stopa, Marcin
    Rakowicz, Piotr
    Marciniak, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/220715.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical coherence tomography
    image processing
    mathematical morphology
    vessel segmentation
    Opis:
    In this paper methods and their examination results for automatic segmentation and parameterization of vessels based on spectral domain optical coherence tomography (SD-OCT) of the retina are presented. We present three strategies for morphologic image processing of a fundus image reconstructed from OCT scans. A specificity of initial image processing for fundus reconstruction is analysed. Then, the parameterization step is performed based on the vessels segmented with the proposed algorithm. The influence of various methods on the vessel segmentation and fully automatic vessel measurement is analysed. Experiments were carried out with a set of 3D OCT scans obtained from 24 eyes (12 healthy volunteers) with the use of an Avanti RTvue OCT device. The results of automatic vessel segmentation were numerically compared with those prepared manually by the medical doctor experts.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 3; 449-461
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-destructive inspection of anti-corrosion protective coatings using optical coherent tomography
    Autorzy:
    Antoniuk, P.
    Strąkowski, M. R.
    Pluciński, J.
    Kosmowski, B. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/220649.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical coherence tomography
    corrosion
    anti-corrosion coatings inspection
    Opis:
    Optical Coherence Tomography (OCT) is one of the most rapidly advancing techniques. This method is capable of non-contact and non-destructive investigation of the inner structure of a broad range of materials. Compared with other methods which belong to the NDE/NDT group (Non-Destructive Evaluation/Non-Destructive Testing methods), OCT is capable of a broad range of scattering material structure visualization. Such a non-invasive and versatile method is very demanded by the industry. The authors applied the OCT method to examine the corrosion process in metal samples coated by polymer films. The main aim of the research was the evaluation of the anti-corrosion protective coatings using the OCT method. The tested samples were exposed to a harsh environment. The OCT measurements have been taken at different stages of the samples degradation. The research and tests results have been presented, as well as a brief discussion has been carried out.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 365-372
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of Sol-Gel Derived Hydroxyapatite Enhanced with Silver Nanoparticles using OCT and Raman Spectroscopy
    Autorzy:
    Głowacki, M. J.
    Gnyba, M.
    Strąkowska, P.
    Gardas, M.
    Kraszewski, M.
    Trojanowski, M.
    Strąkowski, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/221475.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydroxyapatite
    sol-gel
    nanoparticles
    Raman spectroscopy
    optical coherence tomography (OCT)
    Opis:
    Hydroxyapatite (HAp) has been attracting widespread interest in medical applications. In a form of coating, it enables to create a durable bond between an implant and surrounding bone tissues. With addition of silver nanoparticles HAp should also provide antibacterial activity. The aim of this research was to evaluate the composition of hydroxyapatite with silver nanoparticles in a non-destructive and non-contact way. For control measurements of HAp molecular composition and solvent evaporation efficiency the Raman spectroscopy has been chosen. In order to evaluate dispersion and concentration of the silver nanoparticles inside the hydroxyapatite matrix, the optical coherence tomography (OCT) has been used. Five samples were developed and examined ‒ a reference sample of pure HAp sol and four samples of HAp colloids with different silver nanoparticle solution volume ratios. The Raman spectra for each solution have been obtained and analyzed. Furthermore, a transverse-sectional visualization of every sample has been created and examined by means of OCT.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 153-160
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving Segmentation of 3D Retina Layers Based on Graph Theory Approach for Low Quality OCT Images
    Autorzy:
    Stankiewicz, A.
    Marciniak, T.
    Dąbrowski, A.
    Stopa, M.
    Rakowicz, P.
    Marciniak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/221548.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Optical Coherence Tomography (OCT)
    segmentation of retinal layers
    image segmentation
    graph theory
    Opis:
    This paper presents signal processing aspects for automatic segmentation of retinal layers of the human eye. The paper draws attention to the problems that occur during the computer image processing of images obtained with the use of the Spectral Domain Optical Coherence Tomography (SD OCT). Accuracy of the retinal layer segmentation for a set of typical 3D scans with a rather low quality was shown. Some possible ways to improve quality of the final results are pointed out. The experimental studies were performed using the so-called B-scans obtained with the OCT Copernicus HR device.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 269-280
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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