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Analysis of the vascular tone and character of the local blood flow to assess the viability of the body using the photoplethysmographic device DOI:10.15199/48.2017.05.18

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The paper evaluated the vascular tone and character of the local blood flow using photoplethysmographic device to determine the viability of the studied organ and prospects for its preservation. Streszczenie. W pracy przedstawiono ocenę sygnału naczyniowego i charakter lokalnego przepływu krwi z użyciem urządzeń fotopletyzmograficznych do oceny żywotności badanego narządu i perspektywy jego zachowania (Analiza napięcia naczyniowego i charakteru lokalnego przepływu krwi z użyciem urządzeń fotopletyzmograficznych do oceny żywotności narządu). Keywords: occlusive disease of lower extremity arteries, collateral circulation, a survey, photoplethysmography. Słowa kluczowe: zarostowa choroba tętnic kończyn dolnych, krążenie oboczne, badanie, fotopletyzmografia. Introduction Today a significant number of leading companies engaged in development and production of diagnostic medical equipment [1]. The most famous ones are: Philips, MEDIC (Medizinische Messtechnik GmbH), Nonin, Cas Medical System, Radiometer, Micromed, Criticare, UTAS (Ukraine) and others. For biomedical devices is not the most important characteristics are painless, noninvasive measurements in the diagnosis. Among the methods that can provide it, occupy a prominent place optical. Optical methods inherent advantages such as noninvasive of diagnostics, optical signal indifference to electromagnetic interference, multi potential. Photoplethysmography technique compared with other diagnostic methods for biological object, such as the photoacoustic method to increase the reliability of registration hemodynamic circulation, and the introduction of fiber elements technology and sources of different wavelengths of radiation allows the probe accurately solve problems photodynamic studies of hemodynamic parameters or other biological object. In this respect, promising work to create optoelectronic systems for diagnosis, therapy and prediction of the cardiovascular system as an ef[...]

Development of a multi frequency phase method for measuring ranges DOI:10.15199/48.2019.04.25

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In the field of radar sounding, impulse methods for measuring ranges are traditionally used [1,2]. These methods are clear and easy to measure. But the finite duration of the probe pulse limits the accuracy and resolution of the methods. The use of frequency methods makes it possible to improve the accuracy of measuring distances [1,2]. Phase methods for measuring range are known [1,3]. These methods allow measuring the range of only one object, but with high accuracy. Also, phase methods, however, like frequency ones, do not have a "dead zone", which allows them to have a clear advantage over pulsed methods when measuring short ranges. But in the case of frequency methods, probing signals have a wider bandwidth than in the case of phase methods. The range of sounding frequencies is strictly limited to the minimum required quantity that allows to obtain the given accuracy, which has a distinct advantage over other methods. When performing range measurements, the main task is to separate the signals reflected from each object. The developed multi-frequency phase methods allow me to separate the signals reflected from objects by analyzing the amplitude-frequency and phase-frequency characteristics of the total reflected signal, which represents the sum of the harmonic signals reflected from each object in a given frequency range [4-6]. Let us cite short results of the studies which made it possible to obtain a mathematical model on the basis of which it became possible to develop a multi frequency phase method for measuring distances to many objects [7]. Unlike time measurements, when signals reflected from each object are separated in time. In phase measurements, all harmonic signals reflected from all objects act simultaneously, and therefore, as the medium in which radio signals propagate can be considered linear systems, they are algebraically summed at each point. Method Considering a system of N objects that are sou[...]

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