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    Wyświetlanie 1-10 z 10
    Tytuł:
    A New Conception of Measurement Uncertainty Calculation
    Autorzy:
    Jakubiec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399356.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.F-
    03.65.Ta
    06.20.-f
    Opis:
    The paper presents a conception of uncertainty calculation of a result obtained in a direct measurement realized in conditions described by random errors. The conception basis on the error definition being an effect of analysis of a quantization process and, first of all, it permits to determine uncertainty of a single measurement result in measuring and control systems processing signals varying in time. Division of the errors into two types A and B permits elaboration of such a procedure which enables uncertainty calculation for an average value of a series of measurements in the way close to this one proposed by GUM and widely discussed in last years. Theoretical considerations are illustrated by examples showing practical properties of the presented uncertainty calculation procedures.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 436-444
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neural Approximation of Empirical Functions
    Autorzy:
    Roj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399400.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.35.+i
    07.05.Mh
    06.20.-f
    06.20.F-
    06.20.fb
    02.60.Ed
    Opis:
    The paper presents the results of simulation studies of selected neural network structures used for non-linear function approximation based on a limited accuracy data. There was performed the analysis of the interdependence of the network structure and the size of the set of learning patterns. The approximation inaccuracy was expressed by the uncertainty interval width. The approximation properties of the neural method were compared with those of the piece-wise linear and polynomial: "cubic" and "spline" methods.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 554-557
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Normal Force Calibration Method Used for Calibration οf Atomic Force Microscope
    Autorzy:
    Ekwińska, M.
    Rymuza, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807508.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.79.Lh
    68.37.Ps
    06.20.fb
    06.20.F-
    81.70.Bt
    06.20.-f
    Opis:
    Development of new technologies for micro/nanostructures is connected with introduction of new materials or with application of already existing ones in micro- and nanoscale. Unfortunately material parameters in macro- and micro/nanoscale are not the same. For this reason it has become crucial to identify nanomechanical properties of materials commonly used in micro- and nanostructures technology. One of the tests used for that purpose is nanowear test made on the atomic force microscope. However, to obtain quantitative results of measurements, precision calibration step is necessary. In this paper a novel approach to calibration of normal force, which is acting on the tip of an atomic force microscope cantilever, is discussed. Presented method is based on application of known normal force directly on the tip using special test structure. Such an approach allows for measurements of nanowear parameters (force, displacement) with uncertainty better than ± 3%. Authors present and discuss different constructions of calibration samples. A comparison of described method with already existing ones is also presented.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-78-S-81
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of Calibration Uncertainties in the Detector-Based Photometric Calibrations
    Autorzy:
    Sametoglu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812054.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    06.20.Dk
    06.20.fb
    07.60.Dq
    Opis:
    Uncertainty evaluations in the photometric calibrations and established uncertainty budgets at National Metrology Institute of Turkey (TUBITAK-UME) are presented. Uncertainty analyses are cover calibrations of the luminous intensity, the luminous flux and the luminance properties of the optical light source. The combined uncertainty in each photometric calibration was evaluated using developed uncertainty models. The degrees of freedom in each input and output quantities were also determined. The coefficient of uncertainty contribution h(y,$x_i$) was finally determined to present the dominant and less important contributions.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 881-901
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensing Sound Pressure in an Anechoic Chamber Using Backscattered Laser Light
    Autorzy:
    Piper, B.
    Koukoulas, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383751.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    42.62.Eh
    43.58.+z
    78.20.hb
    Opis:
    Current standards for the measurement of the SI derived unit of sound-in-air pressure, the pascal, are based upon microphone reciprocity calibration and are achieved indirectly through microphone sensitivity. These methods require microphones of specific geometry and performance characteristics, effectively artefacts, and are traceable through standards for electrical and dimensional units. Measurement of acousto-optic interactions can provide a direct approach to measuring sound pressure. One acousto-optic interaction is the periodic scattering of photons caused by particles moving in a sinusoidal manner due to propagating sound across interference fringes formed at the intersection of two coherent laser beams. The sequence of these scattered photons, which is collected using telescopic optics and generated by a single photon counting device, can be autocorrelated to yield the periodicity of the photon events. Through mathematical analysis of the autocorrelation function it has been shown that acoustic particle velocity is inversely proportional to the time of the first minimum. This has effectively been shown for measurements in acoustic standing wave tubes and has been developed into a method which can be applied in an anechoic chamber. This paper describes the design and implementation of such a system which allows for a comparison of sound pressure measurements using optical and microphone based techniques.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 128-131
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Methods of Measuring the Delay in Data Transmission Systems with Wireless Network Interfaces
    Autorzy:
    Topor-Kaminski, T.
    Żurkowski, R.
    Grygiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493274.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.10.Pr
    89.20.Hh
    06.20.-f
    06.20.Dk
    07.05.Hd
    Opis:
    The article presents the concept of creating model of delays occurring in telecommunication system taking into account all sources of delays generated during data transmission between the source and destination nodes. Proposed model takes into account the existence of intermediary network devices that play a significant role in the general delay budget. The paper presents two measurement systems used to measure delays in 802.11 g based wireless networks and ones using ZigBee standard. Both systems were built based on the authors' concepts of hardware and software allowing measurement of delays by using additional connection for the synchronization of internal clocks. Described measurement systems selected amount of experiments was performed for varied network structures.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 748-754
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux
    Autorzy:
    Sametoglu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504597.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.15.Eq
    07.60.-j
    06.20.F-
    07.60.Dq
    Opis:
    A two-axis goniophotometer is constructed at National Metrology Institute of Turkey (TUBITAK UME) for characterizing photometric properties of compact light sources. With the new device, total luminous flux emitted by a light source at both cap-up or cap-down mounting positions is calculated from the integration of the illuminance values E( θ, φ) measured on the goniometric spherical surface. The internal calibration of the system is performed by means of two calibrated light sources with known luminous flux values. The constructed system is also capable of measuring the luminous intensity distribution values I( θ, φ) of compact light sources. The uncertainty analyses of the luminous flux measurements as well as the internal calibration of the instrument are also presented herein.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 783-791
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Optical Hydrophone for the Single-Shot Field Measurements of High Power Pressure Pulse Fields
    Autorzy:
    Jamshidi-Rad, A.
    Ueberle, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383349.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    42.25.Fx
    43.35.Sx
    43.35.Yb
    Opis:
    The measurements of ultrasonic fields are often performed using polyvinylidene fluoride (PVDF) membrane hydrophones. Recently, optical hydrophones have gained popularity. Refractive type optical hydrophones are based on the change of refractive index at a glass-water interface when the shockwave passes the sensitive area. A major disadvantage of the optical and the PVDF hydrophones is the fact that they provide a single spot sensitive area, with the result that field measurements need a repositioning of the probe. In this work we introduce a multi-spot optical hydrophone with six measurement spots, for the single shot field measurement of shockwave fields. We measure a highly stable shockwave source with a calibrated hydrophone and the multi-spot optical hydrophone and we find good agreement for the calculated energy values of the shockwave field (depending on the energy settings 4% ± 1%).
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 69-71
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement Possibility Analysis of the Real Values of the Tissue Structure Parameters with the Use of Optical Coherent Tomography Method
    Autorzy:
    Kasprzak, J.
    Kęcik, D.
    Zajac, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493240.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    42.79.-e
    42.79.Ls
    42.30.Wb
    87.19.rm
    Opis:
    The issues connected with the usefulness of the method of averaging A-scans applied in measurements of real optical parameters with the use of commercial optical coherent tomography systems have been discussed. The basic method description and examples of applications have been given. Examples of the characteristics of metrological devices used in medical practice as well as the possibility of the method applied to the turbidity assessment have been presented.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 662-665
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NDT of Rating Impact of Laser Padding on the Surface Layer
    Autorzy:
    Napadłek, W.
    Witoś, M.
    Prusik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030457.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.15.Fg
    03.75.Pp
    81.70.Ex
    81.70.Fy
    75.50.Bb
    06.20.-f
    06.60.Mr
    Opis:
    The article presents the problem of quality control the paramagnetic material of weld overlays laser made on ferro- and paramagnetic materials (steels, cast iron). To assess the quality of weld overlays paramagnetic material, and also the impact of overheating, besides laboratory researches on Keyence optical microscope, used measurement of existing magnetization of magnetic field distribution. Examples of test results by magnetic memory of metals are presented. It has been found, that is expedient use magnetic methods to assess the quality the microstructure of laser pad welded surface layer (influence of heat generation, microstructure changes, chemical composition and own stresses).
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 707-709
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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