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    Wyświetlanie 1-8 z 8
    Tytuł:
    Separation of isochromatics and isoclinics phasemaps for the photoelastic technique with use phase shifting and a large number of high precision images
    Autorzy:
    Magalhaes, C. A.
    Neto, P. S.
    Magalhaes Jr P. A., A.
    de Barcellos, C. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/220820.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photoelasticity
    metrology
    stress analysis
    strain measurement
    optical measurement systems
    optical interferometry
    experimental techniques
    Opis:
    Digital photoelasticity is an important optical metrology follow-up for stress and strain analysis using full-field digital photographic images. Advances in digital image processing, data acquisition, procedures for pattern recognition and storage capacity enable the use of the computer-aided technique in automation and facilitate improvement of the digital photoelastic technique. The objective of this research is to find new equations for a novel phase-shifting method in digital photoelasticity. Some innovations are proposed. In terms of phaseshifting, only the analyzer is rotated, and the other equations are deduced by applying a new numerical technique instead of the usual algebraic techniques. This approach can be used to calculate a larger sequence of images. Each image represents a pattern and a measurement of the stresses present in the object. A decrease in the mean errors was obtained by increasing the number of observations. A reduction in the difference between the theoretical and experimental values of stresses was obtained by increasing the number of images in the equations for calculating phase. Every photographic image has errors and random noise, but the uncertainties due to these effects can be reduced with a larger number of observations. The proposed method with many images and high accuracy is a good alternative to the photoelastic techniques.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 127-138
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative accuracy analysis of triangulated surface models of a fossil skull digitized with various optic devices
    Autorzy:
    Garashchenko, Yaroslav
    Kogan, Ilja
    Rucki, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2052109.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Madygenerpeton
    optical measurement
    triangulated model
    polygonal analysis
    accuracy
    Opis:
    Digital metrology was applied for evaluate 3D models of the unique skull of a fossil tetrapod, Madygenerpeton pustulatum, generated using various 3D digitization methods. The skull surface is covered by minute tubercles making it challenging for digitization with appropriate accuracy. Uniqueness and fragility of the specimen preclude the use of tactile measuring systems for creating a standardized reference model. To overcome this problem, comparative analysis of the triangulated models generated from the clouds of points obtained with seven different devices was conducted using the Geomagic Studio and Autodesk PowerShape CAD software. In the proposed approach, geometrically and dimensionally closest-fitting models underwent detailed statistical analysis between surface polygons in three steps. First, 3D models obtained from different scanning methods were compared with each other in couples. Next, statistical analysis of the differences between the coupled models was performed. Finally, a rating list of the models related to the required accuracy was prepared. The proposed approach is applicable to any other scanned object, especially in palaeontological applications, where each object is unique and exhibits individual features.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 1; 37-51
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental analysis by measurement of surface roughness variations in turning process of duplex stainless steel
    Autorzy:
    Krolczyk, G. M.
    Legutko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/220659.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turning
    coatings
    friction-reducing
    optical microscopy
    surface roughness analysis and models
    Opis:
    The objective of the investigation was to identify surface roughness after turning with wedges of coated sintered carbide. The investigation included predicting the average surface roughness in the dry machining of Duplex Stainless Steel (DSS) and the determination of load curves together with roughness profiles for various cutting conditions. The load curves and roughness profiles for various cutting wedges and variable cutting parameters were compared. It has been shown that dry cutting leads to a decrease in friction for lubricated surfaces, providing a small initial contact area where the surface is contacted. The study has been performed within a production facility during the production of electric motor parts and deep-well pumps.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 4; 759-770
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological analysis of additively manufactured copies of a fossil skull
    Autorzy:
    Rucki, Mirosław
    Garashchenko, Yaroslav
    Kogan, Ilja
    Ryba, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2173724.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    Madygenerpeton
    optical measurement
    statistical analysis
    produkcja dodatkowa
    pomiar optyczny
    analiza statystyczna
    Opis:
    This paper presents the results of a metrological analysis of the additively manufactured (AM) copies of a complex geometrical object, namely the fossil skull of Madygenerpeton pustulatum. This fossil represents the unique remains of an extinct “reptiliomorph amphibian” of high importance for palaeontological science. For this research, the surface was scanned and twelve different copies were 3D-printed using various devices, materials, and AM techniques. The same digitized model was used as a reference to compare with the surfaces obtained by Mitutoyo Coordinate Measuring Machine (CMM) CRYSTA-Apex S 9166 for each copy. The fidelity of the copies was assessed through statistical analysis of the distances between compared surfaces. The methodology provided a good background for the choice of the most accurate copies and the elimination of the less accurate ones. The proposed approach can be applied to any object of complex geometry when reproduction accuracy is to be assessed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143827
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Assessment of the Microstructure of Barite Aggregate from Different Deposits Using X-Ray Microtomography and Optical Microscopy
    Autorzy:
    Żołek, N.
    Ranachowski, Z.
    Ranachowski, P.
    Jóźwiak-Niedźwiedzka, D.
    Kudela, S. jr.
    Dvorak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/351890.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barite ore
    barite aggregate
    microstructure
    optical microscopy
    thin sections analysis
    X-ray tomography
    Opis:
    Two different barite ore (barium sulfate BaSO4) specimens from different localizations were tested and described in this paper. Analysis of the microstructure was performed on polished sections, and on thin sections using X-ray microtomography (micro-CT), and optical microscopy (MO). Microtomography allowed obtaining three-dimensional images of the barite aggregate specimens. In the tomograms, the spatial distribution of the other polluting phases, empty space as well as cracks, pores, and voids – that exceeded ten micrometers of diameter-were possible to visualize. Also, the micro-CT allowed distinguishing between minerals of different density, like SiO2 and BaSO4. Images obtained and analyzed on thin sections with various methods using the optical microscopy in transmitted light delivered additional information on the aggregate microstructure, i.e. allow for estimation of the different kinds of inclusions (like the different density of the minerals) in the investigated specimens. Above methods, which were used in the tests, completed each another in order to supply a set of information on inclusions’ distribution and to present the important differences of the barite aggregate specimens microstructure.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 697-702
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and evaluation of a needle tip measurement system based on binocular vision
    Autorzy:
    Lin, Yuyang
    Shi, Yunlai
    Zhang, Jun
    Wang, Fugang
    Sun, Haichao
    Powiązania:
    https://bibliotekanauki.pl/articles/220501.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    needle tip measurement
    binocular vision system
    measurement capability analysis
    non-contact optical positioning
    Opis:
    The precise location of the needle tip is critical in robot-assisted needle-based percutaneous interventions. An automatic needle tip measuring system based on binocular vision technology with the advantages of non-contact, excellent accuracy and high stability is designed and evaluated. First the measurement requirements of the prostate intervention robot are introduced. A laser interferometer is used as the reference for measuring the position of the needle tip whose relative position variation is described as the needle tip distance in the time domain. The parameters of the binocular cameras are obtained by Zhang’s calibration method. Then a robust needle tip extraction algorithm is specially designed to detect the pixel coordinates of the needle tip without installing the marked points. Once the binocular cameras have completed the stereo matching, the 3D coordinates of the needle tip are estimated. The measurement capability analysis (MCA) is used to evaluate the performance of the proposed system. The accuracy of the system can be controlled within 0.3621 mm. The agreement analysis is conducted by the Bland-Altman analysis, and the Pearson correlation coefficient is 0.999847. The P/T ratio value is 16.42% in the repeatability analysis. The results indicate that the accuracy and stability of the binocular vision needle tip measuring system are adequate to meet the requirement for the needle tip measurement in percutaneous interventions.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 495-512
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Machine learning system for automated blood smear analysis
    Autorzy:
    Grochowski, Michał
    Wąsowicz, Michał
    Mikołajczyk, Agnieszka
    Ficek, Mateusz
    Kulka, Marek
    Wróbel, Maciej S.
    Jędrzejewska-Szczerska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/220750.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical microscopy
    blood cells
    biophotonics
    image analysis
    classification
    eigenfaces
    neural networks
    decision support
    nanodiamonds
    bioimaging
    Opis:
    In this paper the authors propose a decision support system for automatic blood smear analysis based onmicroscopic images. The images are pre-processed in order to remove irrelevant elements and to enhancethe most important ones – the healthy blood cells (erythrocytes) and the pathologic ones (echinocytes). The separated blood cells are analysed in terms of their most important features by the eigenfaces method. The features are the basis for designing the neural network classifier, learned to distinguish between erythrocytes and echinocytes. As the result, the proposed system is able to analyse the smear blood images in a fully automatic way and to deliver information on the number and statistics of the red blood cells, both healthy and pathologic. The system was examined in two case studies, involving the canine and human blood, and then consulted with the experienced medicine specialists. The accuracy of classification of red blood cells into erythrocytes and echinocytes reaches 96%.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 1; 81-93
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology of increasing accuracy of gear models manufactured using additive FDM method
    Metodyka poprawy dokładności modeli kół zębatych wytwarzanych z zastosowaniem addytywnej metody FDM
    Autorzy:
    Budzik, G.
    Dziubek, T.
    Kozik, B.
    Sobolewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/951474.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gears
    3D-CAD
    RP techniques
    FDM technology
    optical measurement
    accuracy analysis
    koła zębate
    3D CAD
    techniki RP
    technika FDM
    pomiary optyczne
    analiza dokładności
    Opis:
    The paper presents methodology of increasing the accuracy of models of gears made applying additive methods. As a part of activities related to this subject, it was necessary to develop 3D-CAD research gears, which were the basis for producing physical models made using incremental FDM manufacturing technology. The created models were verified in order to determine the accuracy of resulting geometry. Then modifications were introduced to models so as to increase their accuracy. On this basis, in an iterative process, compensation coefficients were calculated to ensure reduction of defects in geometry with respect to a nominal 3D-CAD model.
    W artykule przedstawiono sposób poprawy dokładności modeli kół zębatych wytwarzanych z zastosowaniem metod addytywnych. Opracowano model 3D-CAD badawczych kół zębatych. Stanowiły podstawę do wytworzenia modeli fizycznych wykonywanych z zastosowaniem przyrostowej techniki wytwarzania FDM. Modele poddano weryfikacji w celu określenia dokładności ich wykonania. Wprowadzono modyfikację tych modeli dla podwyższenia ich dokładności. W procesie iteracyjnym ustalono wartości współczynnika kompensacji odkształceń. Zapewniono zmniejszenie błędów wykonania modelu w porównaniu z nominalnym modelem 3D-CAD.
    Źródło:
    Advances in Manufacturing Science and Technology; 2015, 39, 4; 37-52
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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