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Lee J.,Physikalisch - Technische Bundesanstalt | Nissila J.,Center for Metrology and Accreditation | Katkov A.,Di Mendeleyev Institute For Metrology Vniim | Behr R.,Physikalisch - Technische Bundesanstalt
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

An AC quantum voltmeter has been developed for precision AC voltage measurements into the kHz range. A special sub-sampling technique is used such that no information of the AC voltage under test is lost. A comparison of the AC quantum voltmeter and an ultra-stable precision waveform generator has been performed. The Allan deviation analysis demonstrates a voltage output stability of 2 × 10-8 in 1 minute at the level of 2.5 VRMS. The measurements are validated with an AC-DC transfer measurement using a planar multijunction thermal converter. © 2014 IEEE. Source


Park P.G.,Korea Research Institute of Standards and Science | Kim W.-S.,Korea Research Institute of Standards and Science | Kim M.-S.,Korea Research Institute of Standards and Science | Shifrin V.Y.,Di Mendeleyev Institute For Metrology Vniim
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

The Cheongyang (CYG) observatory has been built to measure earth's magnetic field and to study prediction of earthquake and space weather. The equipments of the CYG observatory are a 3-axis fluxgate magnetometer, an overhauser effect proton magnetometer, a declination/inclination magnetometer and a data logger. A Cs-4He atomic magnetic resonance magnetometer was used to correct the measured data obtained by the proton magnetometer. All the measurement equipments were calibrated using magnetic field standard system maintained at KRISS. The Measurement results show a variation of the baselines less than 5 nT within one year, which is the most critical requirement criteria for joining the INTERMAGNET (International Real-time Magnetic Observatory Network). © 2014 IEEE. Source


Chunovkina A.,Di Mendeleyev Institute For Metrology Vniim | Stepanov A.,Di Mendeleyev Institute For Metrology Vniim
XXI IMEKO World Congress "Measurement in Research and Industry" | Year: 2015

This work deals with evaluation of the measurand when results of only three measurements are available. Different algorithms are analyzed and compared according to the methodology of data processing algorithms certification. Source


Tereshchenko E.,Di Mendeleyev Institute For Metrology Vniim | Moiseev N.,Di Mendeleyev Institute For Metrology Vniim
Applied Radiation and Isotopes | Year: 2012

The article describes the development of a KX-γ-coincidence method implemented in the prototype setup developed at the ionizing radiation department of the D.I. Mendeleyev Institute for Metrology. The first part was presented at Third European IRPA Congress (2010 June 14-18, Helsinki, Finland). NaI(Tl) crystals of 100μm×40mm and 80mm×80mm are used for photon radiation detection. A set of "ORTEC NIM" units and ADC "MKGB-01" are used for coincident pulse processing. The activity of electron-capture radionuclides 54Mn, 57Co, 65Zn, 85Sr, 88Y, 139Ce and 119mSn was measured. The expanded uncertainty (k=2) of activity was estimated in the range of 1-2%. The main metrological characteristics of the setup were determined: long-term stability, background, dead time, resolving time. The results obtained are in good agreement with international comparisons results and the Russian national standard of radioactivity. © 2012 Elsevier Ltd. Source


Tereshchenko E.E.,Di Mendeleyev Institute For Metrology Vniim | Moiseev N.,Di Mendeleyev Institute For Metrology Vniim
Applied Radiation and Isotopes | Year: 2012

At the ionising radiation department of the D.I. Mendeleyev Institute for Metrology, a semiconductor detector was calibrated in the energy range 200-8500. keV using (n,2γ) and (n,γ) reactions.Separate cylindrical targets (77mm diameter and 10mm height) were made from mercuric sulphate, sodium chloride and metallic titanium. A 252Cf spontaneous fission neutron source, placed in 150mm diameter polyethylene ball, was used to generate thermal neutrons. The optimal target dimensions were determined taking into account the thermal neutron cross-sections and gamma-radiation attenuations in the target materials. The influence of the background radiation induced by neutrons from the walls, floors and ceilings was also taken into account. The shapes of the efficiency curves for point and volume sources in the 200-8500keV range have been investigated. The experimental results are in good agreement with Monte-Carlo calculations.The emission rate of the 6.13MeV photons from a 238Pu-13C source was determined with an expanded uncertainty, Uc, of 10% (k=2). © 2012 Elsevier Ltd. Source

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