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Surface Plasmon Resonance Based Sensing of Aqueous Solutions Using Spectral Interferometry

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Luňáček J., Hlubina P., Ciprian D., Duliaková M., Luňáčková M.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1
23-27
EN
This paper deals with a polarimetric setup to measure the refractive index change of aqueous solutions. The experimental method is based on the surface plasmon resonance effect in the Kretschmann configuration combined with spectral interferometry. In order to retrieve surface plasmon resonance-induced differential phase change, a windowed Fourier transform was adopted to extract the phases from two spectral interferograms, one corresponding to the reference material (air) and the second to the analyte (NaCl aqueous solution). The shift of phase curve is related to the analyte refractive index change. The refractive index of the NaCl aqueous solutions (0, 2 and 5 percent) was measured by the Abbe refractometer at a wavelength of 589.3 nm and compared with theoretical one, calculated by the Lorentz-Lorenz equation. An excellent agreement between the values was confirmed. The resonance wavelengths as extremes of the surface plasmon resonance-induced differential phase changes retrieved from spectral interference signals were compared with the resonance wavelengths determined from spectral reflectance measurements. A good agreement between the values was confirmed.
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The Effect of Magnet Magnetization Vector Orientation in Halbach Arrays on the Effectiveness of Separation

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Repková J., Mahuliaková M., Ciprian D., Lesňák M., Luňáček J.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
158-159
EN
Magnetic separation is one of the methods that are used to separate magnetic and non-magnetic components from an input mixture. Its effectiveness strongly depends on the strength and distribution of magnetic field in the separator. It is economical to use Halbach permanent magnet arrays to create a suitable magnetic field, since they do not change their properties during separation and do not need electrical energy. During real magnetization process, however, there can be a problem with correct orientation of their magnetization vector. The work based on 2D computer models shows the influence of different orientations of magnetization vectors of individual elements of Halbach arrays on the size and distribution of the magnetic field in the considered separator space. Several model systems that contained four to six typical AlNiCo, SmCo and NdFeB cube shaped magnets with the dimensions 50×50×50 mm^3 were used for the analysis.
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