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    Wyświetlanie 1-11 z 11
    Tytuł:
    ARMScope – the versatile platform for scanning probe microscopy systems
    Autorzy:
    Świadkowski, Bartosz
    Piasecki, Tomasz
    Rudek, Maciej
    Świątkowski, Michał
    Gajewski, Krzysztof
    Majstrzyk, Wojciech
    Babij, Michał
    Dzierka, Andrzej
    Gotszalk, Teodor
    Powiązania:
    https://bibliotekanauki.pl/articles/221551.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Scanning probe microscopy
    AFM
    Kelvin Probe force microscopy
    scanning tunnelling microscopy
    Opis:
    Scanning probe microscopy (SPM) since its invention in the 80’s became very popular in examination of many different sample parameters, both in university and industry. This was the effect of bringing this technology closer to the operator. Although the ease of use opened a possibility for measurements without high labour requirement, a quantitative analysis is still a limitation in Scanning Probe Microscopes available on the market. Based on experience of Nano-metrology Group, SPM still can be considered as a tool for quantitative examination of thermal, electrical and mechanical surface parameters. In this work we present an ARMScope platform as a versatile SPM controller that is proved to be useful in a variety of applications: from atomic-resolution STM (Scanning Tunnelling Microscopy) to Multi-resonance KPFM (Kelvin Probe force microscopy) to commercial SEMs (Scanning electron microscopes).
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 1; 119-130
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impedance measurements problem in antennas for RFID technique
    Autorzy:
    Jankowski-Mihułowicz, P.
    Pitera, G.
    Węglarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221609.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    RFID
    antenna
    impedance measurement
    differential probe
    Opis:
    The authors paid particular attention to the problem of antenna impedance measurements in the RFID technique. These measurements have to be realized by using two ports of a vector network analyzer and dedicated passive differential probes. Since the measurement process and estimated parameters depend on the frequency band, operating conditions, type of the system component and antenna designs used, appropriate verification of the impedance parameters on the basis of properly conducted experiments is a crucial stage in the antenna synthesis of transponders and read/write devices. Accordingly, a systematized procedure of impedance measurements is proposed. It can be easily implemented by designers preparing antennas for different kinds of RFID applications. The essence of indirect measurements of the differential impedance parameters is discussed in details. The experimental verification has been made on the basis of a few representative examples.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 509-520
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified pressure-pressure sound intensity measurement method and its application to loudspeaker set directivity assessment
    Autorzy:
    Mickiewicz, Witold
    Raczyński, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/220959.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound intensity
    pressure-pressure intensity probe
    loudspeaker set measurements
    Opis:
    Sound intensity measurements using special sensors in a form of pressure-velocity and pressure-pressure probes are becoming more and more often the method of choice for characterization of sound sources. Its wider usability is blocked by the probes’ costs. This paper is on a possible modification of the well-known pressure-pressure sound intensity measurement method. In the proposed new approach a synchronized measurement procedure using only single microphone is used. The paper presents the basics of the sound intensity theory, a review of currently used methods of intensity measurement and requirements and limitations of the new method. In the proposed approach one microphone and a properly designed positioning system is used. The application of the method to study the directional characteristics of an active loudspeaker system have been described in detail. The obtained results were compared with those of measurements performed with a commercial p-u probe. The paper contains conclusions indicating advantages of the applied method in comparison with standard pressure measurement methods.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 1; 181-194
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A 2-Port, Space-Saving, Maintenance-Friendly Pneumatic Probe for Velocity Measurements
    Autorzy:
    Olczyk, A.
    Magiera, R.
    Kabalyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/221299.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pneumatic probes
    probe calibration
    uncertainty of measurements
    velocity measurements
    Opis:
    This paper presents the concept, design and experimental results of tests, in laboratory conditions, of a 2-port, space-saving pneumatic probe. The main features of the probe are a result of restrictions imposed by the functioning environment: a limited space for probe installation, the possibility of processing only two output signals and requirements for simplicity and reliability of the probe. A cylindrical shape of the probe tip is proposed as a general concept, similar to the classic, cylindrical, 3-port probe. The main difference arises in using only two pressure signals: one from the overpressure zone on the front side of the cylinder and another, from the underpressure zone on the back side. After performing an appropriate calibration procedure, it is possible to measure the flow velocity and correct the pressure difference obtained by means of a velocity coefficient kv. This paper also presents an analysis of the kv coefficient uncertainty to evaluate the quality of measurements.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 1; 171-185
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dopant-Based Charge Sensing Utilizing P-I-N Nanojunction
    Autorzy:
    Nowak, R.
    Jabłoński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/220915.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanosensor
    silicon
    p-i-n junction
    dopant
    Kelvin Probe Force Microscope
    Opis:
    We studied lateral silicon p-i-n junctions, doped with phosphorus and boron, regarding charge sensing feasibility. In order to examine the detection capabilities and underlying mechanism, we used in a complementary way two measurement techniques. First, we employed a semiconductor parameter analyzer to measure I−V characteristics at a low temperature, for reverse and forward bias conditions. In both regimes, we systematically detected Random Telegraph Signal. Secondly, using a Low Temperature Kelvin Probe Force Microscope, we measured surface electronic potentials. Both p-i-n junction interfaces, p-i and i-n, were observed as regions of a dynamic behaviour, with characteristic time-dependent electronic potential fluctuations. Those fluctuations are due to single charge capture/emission events. We found analytically that the obtained data could be explained by a model of two-dimensional p-n junction and phosphorus-boron interaction at the edge of depletion region. The results of complementary measurements and analysis presented in this research, supported also by the previous reports, provide fundamental insight into the charge sensing mechanism utilizing emergence of individual dopants.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 391-399
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of different probing systems used in articulated arm coordinate measuring machines
    Autorzy:
    Brau, A.
    Valenzuela, M.
    Santolaria, J.
    Aguilar, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221100.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    articulated arm coordinate measuring machine
    probing systems
    self-centering active probe
    Opis:
    This paper presents a comparison of different techniques to capture nominal data for its use in later verification and kinematic parameter identification procedures for articulated arm coordinate measuring machines (AACMM). By using four different probing systems (passive spherical probe, active spherical probe, self-centering passive probe and self-centering active probe) the accuracy and repeatability of captured points has been evaluated by comparing these points to nominal points materialized by a ball-bar gauge distributed in several positions of the measurement volume. Then, by comparing these systems it is possible to characterize the influence of the force over the final results for each of the gauge and probing system configurations. The results with each of the systems studied show the advantages and original accuracy obtained by active probes, and thus their suitability in verification (active probes) and kinematic parameter identification (self-centering active probes) procedures.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 233-246
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel deep penetrating eddy current probe based on phase shifted fields and its application to inspection of defects
    Autorzy:
    Wu, Meixian
    Zhang, Dongli
    Wang, Chuanglong
    Powiązania:
    https://bibliotekanauki.pl/articles/221582.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    skin effect
    penetration depth
    austenitic stainless steel
    eddy current probe
    phase shifted fields
    Opis:
    Due to the skin effect of eddy currents, the depth of cracks which can be detected by the traditional eddy current probe is very limited. In order to improve the ability of eddy current probes to inspect deep cracks in metal thick-walled structures, a new eddy current probe using an excitation system with phase shifted fields was proposed. Its feasibility for detecting deep cracks was verified by simulation and experiments. The results showed that the penetration depth of eddy currents in austenitic stainless steel is effectively enhanced by using the new probe.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 2; 275-287
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical measurement strategies for verification of freeform surfaces using coordinate measuring machines
    Autorzy:
    Rajamohan, G.
    Shunmugam, M. S.
    Samuel, G. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/220456.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    freeform surface
    coordinate measuring machine
    machining errors
    probe size
    sampling strategies
    substitute geometry
    Opis:
    Freeform surfaces have wider engineering applications. Designers use B-splines, Non-Uniform Rational Bsplines, etc. to represent the freeform surfaces in CAD, while the manufacturers employ machines with controllers based on approximating functions or splines. Different errors also creep in during machining operations. Therefore the manufactured freeform surfaces have to be verified for conformance to design specification. Different points on the surface are probed using a coordinate measuring machine and substitute geometry of surface established from the measured points is compared with the design surface. The sampling points are distributed according to different strategies. In the present work, two new strategies of distributing the points on the basis of uniform surface area and dominant points are proposed, considering the geometrical nature of the surfaces. Metrological aspects such as probe contact and margins to be provided along the sides have also been included. The results are discussed in terms of deviation between measured points and substitute surface as well as between design and substitute surfaces, and compared with those obtained with the methods reported in the literature.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 209-222
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surrogate synthesis of frame eddy current probes with uniform sensitivity in the testing zone
    Autorzy:
    Halchenko, Volodymyr Ya.
    Trembovetska, Ruslana
    Tychkov, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/1848998.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy current probe
    uniform sensitivity
    metamodel
    additive neural network regression
    surrogate optimization
    global extremum
    Opis:
    A mathematical method for nonlinear surrogate synthesis of frame surface eddy current probes providing a uniform eddy current density distribution in the testing object area is proposed. A metamodel of a frame movable eddy-current probe with a planar excitation system structure, used in the algorithm for surrogate optimal synthesis was created. The examples of a nonlinear synthesis of excitation systems with the application of the modern metaheuristic stochastic algorithms for finding the global extremum are considered. The numerical findings of the problem analyses are presented. The efficiency of the synthesized excitation structures was demonstrated on the basis of the eddy current density distribution graphs on the surface of the control zone of the object in comparison with classical analogues.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 551-564
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surrogate synthesis of frame eddy current probes with uniform sensitivity in the testing zone
    Autorzy:
    Halchenko, Volodymyr Ya.
    Trembovetska, Ruslana
    Tychkov, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/1849043.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy current probe
    uniform sensitivity
    metamodel
    additive neural network regression
    surrogate optimization
    global extremum
    Opis:
    A mathematical method for nonlinear surrogate synthesis of frame surface eddy current probes providing a uniform eddy current density distribution in the testing object area is proposed. A metamodel of a frame movable eddy-current probe with a planar excitation system structure, used in the algorithm for surrogate optimal synthesis was created. The examples of a nonlinear synthesis of excitation systems with the application of the modern metaheuristic stochastic algorithms for finding the global extremum are considered. The numerical findings of the problem analyses are presented. The efficiency of the synthesized excitation structures was demonstrated on the basis of the eddy current density distribution graphs on the surface of the control zone of the object in comparison with classical analogues.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 551-564
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surrogate synthesis of frame eddy current probes with uniform sensitivity in the testing zone
    Autorzy:
    Halchenko, Volodymyr Ya.
    Trembovetska, Ruslana
    Tychkov, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/1849059.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy current probe
    uniform sensitivity
    metamodel
    additive neural network regression
    surrogate optimization
    global extremum
    Opis:
    A mathematical method for nonlinear surrogate synthesis of frame surface eddy current probes providing a uniform eddy current density distribution in the testing object area is proposed. A metamodel of a frame movable eddy-current probe with a planar excitation system structure, used in the algorithm for surrogate optimal synthesis was created. The examples of a nonlinear synthesis of excitation systems with the application of the modern metaheuristic stochastic algorithms for finding the global extremum are considered. The numerical findings of the problem analyses are presented. The efficiency of the synthesized excitation structures was demonstrated on the basis of the eddy current density distribution graphs on the surface of the control zone of the object in comparison with classical analogues.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 551-564
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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