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  • BIPM comparison BIPM.RI(II)-K1.Ge-68 of activity measurements of the radionuclide 68 Ge for the LNMRI/IRD, NIST, NIM, IRA-METAS, LNE-LNHB and the TAEK, and the linked 2015 CCRI(II)-K2.Ge-68 comparison
    Metrologia (IF 2.28) Pub Date : 2020-08-06
    C Michotte, G Ratel, S Courte, M Nonis, A Iwahara, C J Da Silva, R Fitzgerald, D E Bergeron, J T Cessna, L Laureano-Pérez, L Pibida, B E Zimmerman, M Zhang, J Liang, H Liu, F Juget, Y Nedjadi, C Fréchou, C Bobin, E Yeltepe and A Dirican

    This report summarises the results for the new BIPM.RI(II)-K1.Ge-68 comparison. Six metrology institutes have participated, enabling the first value of the key comparison reference value(KCRV) to be determined. The KCRV was calculated using the power-moderated weighted mean and the results. A link has been made to the CCRI(II)-K2.Ge-68 comparison held in 2015 through the NIST, NIM,IRA-METAS and the

    更新日期:2020-08-10
  • Direct comparisons of European primary and secondary frequency standards via satellite techniques
    Metrologia (IF 2.28) Pub Date : 2020-08-04
    F Riedel, A Al-Masoudi, E Benkler, S Dörscher, V Gerginov, C Grebing, S Häfner, N Huntemann, B Lipphardt, C Lisdat, E Peik, D Piester, C Sanner, C Tamm, S Weyers, H Denker, L Timmen, C Voigt, D Calonico, G Cerretto, G A Costanzo, F Levi, I Sesia, J Achkar, J Guéna, M Abgrall, D Rovera, B Chupin, C Shi, S Bilicki, E Bookjans, J Lodewyck, R Le Targat, P Delva, S Bize, F N Baynes, C F A Baynham, W Bowden

    We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain clocks located at INRIM, LNE-SYRTE, NPL and PTB by using two satellite-based frequency comparison techniques: broadband Two-Way Satellite Time and Frequency Transfer (TWSTFT) and Global Positioning System Precise Point Positioning (GPS PPP). With an enhanced statistical analysis procedure taking

    更新日期:2020-08-05
  • The determination of gravitational acceleration in the joule balance at NIM
    Metrologia (IF 2.28) Pub Date : 2020-08-04
    Jinxin Xu, Jinyang Feng, Qiyu Wang, Lishuang Mou, Zhengkun Li, Bin Han, Lushuai Qian, Ruo Hu, Shuqing Wu, Qing He and Tao Zheng

    The determination of the local acceleration of gravity at the mass position is an important aspect of the joule balance. Since a simultaneous measurement of the absolute gravity at the mass position with the joule balance in place is impossible, seven gravity reference sites are chosen in the joule balance laboratory. Absolute and relative gravity measurements at the reference sites were performed

    更新日期:2020-08-05
  • New apparatus for liquids high-pressure density measurement
    Metrologia (IF 2.28) Pub Date : 2020-08-04
    Andreia Furtado, Frank Lorenz and Henning Wolf

    Nowadays, fast and precise density measurements of fluids are mostly performed using so-called oscillation-type density meters, able to measure in a very wide interval of temperature and pressure. This work aimed to developed, characterized and validated a high-pressure density measurement (HPDM) apparatus ensuring the traceability to SI of density measurements performed with these devices at high

    更新日期:2020-08-05
  • Measurement of groove depth standards in the range 1 μm up to 1 mm (EURAMET project 1407)
    Metrologia (IF 2.28) Pub Date : 2020-08-03
    Uwe Brand, Michael Matus, Laura Carcedo, Lukasz Slusarski, Gian Bartolo Picotto, Antti Lassila, Faith Hungwe, Olena Flys, Murat Aksulu and Vladimir Kosteev

    A comparison measurement between 10 national metrology institutes on two types of depth setting standards was conducted using mostly tactile but also two optical instruments for measurement. Three etched silicon standards with depths of 5, 20 and 50 μm and one diamond turned nickel coated copper standard with depths of 200, 600 and 900 μm were measured. The cross section of the grooves was trapezoidal

    更新日期:2020-08-04
  • CCQM-K146 low-polarity analyte in high fat food: benzo[a]pyrene in olive oil
    Metrologia (IF 2.28) Pub Date : 2020-08-03
    Xiaomin Li, Hongmei Li, Qinghe Zhang, Xiaohua Lu, Shuangqing Li, Matthias Koch, Joachim Polzer, Rudolf Hackenber, Md Moniruzzaman, Mala Khan, Elias Kakoulides, Kong Pak-wing, Richy, Ng Chi-shing, Ting Lu, Ee Mei Gui, Pui Sze Cheow, Tang Lin Teo, Eliane Rego, Bruno Garrido, Lucas Carvalho, Rodrigo Leal, Fernando Violante, Song-Yee Baek, Sunyoung Lee, Kihwan Choi, Byungjoo Kim, Milena Bucar-Miklavcic

    The demonstration of competency and equivalence for the assessment of levels of contaminants and nutrients in primary foodstuffs is a priority within the 10-year strategy for the CCQM Organic Analysis WG series of Track A core comparisons. The area of low polarity analytes in high fat foods had not been covered by the OAWG for many years since the key comparison CCQM-K21 p,p'-DDT in fish oil occurring

    更新日期:2020-08-04
  • Pilot comparison CCQM-P177—monoterpenes in nitrogen at 2.5 nmol mol −1 final report
    Metrologia (IF 2.28) Pub Date : 2020-08-03
    Christina Liaskos, George Rhoderick, Joseph Hodges, Antonio Possolo and Olaf Wilke

    Growing awareness of the impact of monoterpenes on climate, atmospheric chemistry, and indoor air quality has necessitated the development of measurement standards to globally monitor and control their emissions. For National Metrology Institutes to develop such standards, it is essential that they demonstrate measurement equivalence for assigned values at the highest levels of accuracy. This report

    更新日期:2020-08-04
  • Key comparison study—organic solvent calibration solution—gravimetric preparation and value assignment of trans-zearalenone (trans-ZEN) in acetonitrile (ACN)
    Metrologia (IF 2.28) Pub Date : 2020-08-03
    R D Josephs, A Daireaux, M Bedu, Xiuqin Li, Xiaomin Li, Z Guo, T Choteau, G Martos, S Westwood, R I Wielgosz, H Li, M Simón, E C P do Rego, B C Garrido, R Leal, L Carvalho, E Guimarães, A Bahadoor, J Bates, J E Melanson, P Giannikopoulou, C Alexopoulos, E Kakoulides, I Mugenya, D Prevoo-Franzsen, M Fernandes-Whaley, S Marbumrung, M Bilsel, B Binici and T Gokcen

    The CCQM-K154.a and subsequent CCQM-K154.a.1 comparisons were coordinated by the the Bureau International des Poids et Mesures (BIPM) and the Chinese National Institute of Metrology (NIM) on behalf of the Organic Analysis Working Group (OAWG) of the Comité Consultatif pour la Quantité de Matière (CCQM) for National Measurement Institutes (NMIs) and Designated Institutes (DIs) which provide measurement

    更新日期:2020-08-04
  • Key comparison EURAMET.PR-K2.a.2011—spectral responsivity in the range of 900 nm to 1600 nm
    Metrologia (IF 2.28) Pub Date : 2020-08-02
    Steven van den Berg, Paul Dekker, Subrena Harris, Teresa Goodman, Marek Šmíd, Grzegorz Szajna, Jarle Gran, Anne Andersson, Stefan Källberg, Özcan BAZKIR and Seval MERIC

    The Euramet.PR-K2.a comparison on spectral responsivity for the wavelength range 900 nm to 1600 nm, as described in this report, was carried out to establish the degree of equivalence for the participating European laboratories with respect to the Key Comparison Reference Value (KCRV) of the CCPR-K2.a-2003 comparison. Seven laboratories, including pilot and link laboratory, participated. The comparison

    更新日期:2020-08-03
  • Pneumatic gauge pressure comparison from 700 kPa to 7 000 kPa
    Metrologia (IF 2.28) Pub Date : 2020-08-02
    Leonardo De la Cruz, Jorge Torres, Adrián Solano, Marcial Espinoza, Maria Neyra, Pablo Constantino, Jesús Aranzolo and Ricardo Sánchez

    This report presents the final results of the supplementary comparison SIM.M.P-S10 for pneumatic gauge pressure from 700 kPa to 7 000 kPa. This comparison was carried out in the period from November 2014 to January 2015, by using a digital pressure manometer with uncertainty 0.010 % of the reading as the transfer standard for the comparison. The reference value for this comparison was given by the

    更新日期:2020-08-03
  • Pilot study on peptide purity—synthetic oxytocin
    Metrologia (IF 2.28) Pub Date : 2020-08-02
    R D Josephs, M Li, A Daireaux, T Choteau, G Martos, S Westwood, R I Wielgosz, H Li, S Wang, L Feng, T Huang, M Pan, T Zhang, N Gonzalez-Rojano, M Balderas-Escamilla, A Perez-Castorena, M Perez-Urquiza, I Ün, and M Bilsel

    Under the auspices of the Protein Analysis Working Group (PAWG) of the Comité Consultatif pour la Quantité de Matière (CCQM) a pilot study, CCQM-P55.2.b, was coordinated by the Bureau International des Poids et Mesures (BIPM) and the Chinese National Institute of Metrology (NIM). Three Metrology Institutes or Designated Institutes and the BIPM participated. Participants were required to assign the

    更新日期:2020-08-03
  • Comparisons of air kerma and absorbed dose to water standards in Co-60 radiation beams for radiotherapy
    Metrologia (IF 2.28) Pub Date : 2020-07-30
    Christian Kottler, Andreas Steurer, Frank Delaunay, Jacco de Pooter, Cristina García Mulas and Liviu-Cristian Mihailescu

    The air kerma and absorbed dose to water standards for 60Co radiotherapy beams of 6 EURAMET NMIs were compared by circulating 2 transfer standards. The schedule for the measurements lasted from March 2013 to February 2015. The participants determined the calibration coefficients for the 2 transfer standards in both radiation quantities mentioned above. The comparison results are given in terms of air

    更新日期:2020-08-01
  • GULFMET key comparison of DC voltage at 1.018 V and 10 V
    Metrologia (IF 2.28) Pub Date : 2020-07-26
    Steven Yang, CM Tsui, Stephane Solve, Kyu-Tae Kim, Srdan Calija, Jon Bartholomew and Abdullah Alrobaish

    This report presents the GULFMET key comparison (GULFMET.EM.BIPM-K11) results of DC voltages at the 1.018 V and 10 V with two travelling electronic DC reference standards. This comparison was supported by the BIPM and GULFMET associate members, KRISS and SCL, which are from the APMP. The linking difference from the BIPM.EM-K11 KCRV was calculated. The agreement between participating laboratories is

    更新日期:2020-07-27
  • Final report on key comparison EURAMET.AUV.V-K2
    Metrologia (IF 2.28) Pub Date : 2020-07-26
    Joanna Kolasa and Daniela Virovska

    This final report describes the results obtained in a key comparison of primary vibration calibration facilities. Two piezoelectric standard accelerometers (one single-ended as well one back-to-back type) were calibrated first at Central Office of Measures (GUM), acting as pilot and linking laboratory, and Bulgarian Institute for Metrology (BIM). The results of the BIM obtained in this comparison were

    更新日期:2020-07-27
  • Calibration of thermocouples from 419,527 °C (freezing point of Zn) up to 1492 °C (melting point of the Pd-C eutectic), by the temperature fixed point and comparison methods
    Metrologia (IF 2.28) Pub Date : 2020-07-26
    D del Campo, Y Abdelaziz, M Anagnostou, N Arifovic, R A Bergerud, J Bojkovski, E Ciocarlan, F Edler, C Elliot, O Hathela, N Hodzic, M Holmsten, L Iacomini, M Kozicki, S Nedialkov, M Sadli, S Simic, R Strnad and E Turzó-András

    This report present the results of the EURAMET inter-comparison carried out to compare the calibration of thermocouples from 419,527 °C (freezing point of Zn) up to 1492 °C (melting point of the Pd-C eutectic). This inter-comparison is intended to be used to support the calibration and measurement capabilities (CMCs) of the participants in the calibration of thermocouples. The comparison was organized

    更新日期:2020-07-27
  • Final report on supplementary comparison of national standards for liquid flow COOMET.M.FF-S2 (COOMET Project 406/UA/07)
    Metrologia (IF 2.28) Pub Date : 2020-07-26
    E Frahm, B Mickan, V Gulyuk, G Reut, G Zigmantas, M Benkova and M Kayumov

    A supplementary comparison, COOMET.M.FF-S2, in the field of water flow was organized by the COOMET Technical Committee (TC) 1.4 Flow Measurement. The goal of the comparison was to confirm the calibration and measurement capabilities (CMC) of the participating national metrology institutes (NMIs) in the flow ranges between 0.5 m 3 /h and 5.0 m 3 /h, and, respectively, between 20.0 m 3 /h and 100.0 m

    更新日期:2020-07-27
  • Gravity and anisotropy effects in the volume determination of Si spheres for the kilogram realisation
    Metrologia (IF 2.28) Pub Date : 2020-07-12
    D Mari, A Nicolaus, E Kuhn, N Kuramoto, G Mana and E Massa

    The counting of 28 Si atoms plays a fundamental role in the realisation of the unit of mass in terms of stipulated values of fundamental physical constants. In this realisation, the measurement of the volume of a 28 Si sphere is a fundamental step. This paper reports a finite element analysis of the self-weight effect on the volume determination, taking the crystal anisotropy into account. The sphere

    更新日期:2020-07-13
  • Accounting for polarization–related effects in the measurement of the bidirectional reflectance distribution function
    Metrologia (IF 2.28) Pub Date : 2020-07-12
    A Calderón, A Ferrero and J Campos

    When measuring the Bidirectional Reflectance Distribution Function (BRDF) to characterize typical materials, the effect of the polarization of the light source or the dependence of the detector on the polarization is not usually considered, even though many studies have proven their impact in the uncertainty of the BRDF of most materials, including diffuse reflectance standards. A methodology to assess

    更新日期:2020-07-13
  • The BIPM Kibble balance for realizing the kilogram definition
    Metrologia (IF 2.28) Pub Date : 2020-07-12
    H Fang, F Bielsa, S Li, A Kiss and M Stock

    After several years of development and continuous improvement of the BIPM Kibble balance, mass measurement of a 1 kg Pt/Ir artefact in terms of the Planck constant has been carried out. The paper describes the apparatus and its alignment, and explains the measurement and data processing. The balance operates in a one-mode and two measurement phase scheme using a bifilar coil. The mass value of the

    更新日期:2020-07-13
  • Updated measurement method and uncertainty budget for direct emissivity measurements at the University of the Basque Country
    Metrologia (IF 2.28) Pub Date : 2020-07-12
    I González de Arrieta, T Echániz, R Fuente, J M Campillo-Robles, J M Igartua and G A López

    This work reports on the upgrades made to the direct emissivity measurement facility of the University of the Basque Country (UPV/EHU). The instrumental improvements consist of, among others, a high-vacuum system and a wider temperature range (300 K to 1273 K). Methodological developments include a refined measurement equation with updated parameters and a reworked ISO-compliant uncertainty budget

    更新日期:2020-07-13
  • The interaction between the magnetized coil-suspension system and the compensation coil in the joule balance
    Metrologia (IF 2.28) Pub Date : 2020-07-12
    Lushuai Qian, Jinxin Xu, Zhengkun Li, Bing Han, Wei Zhao and Zhonghua Zhang

    The joule balance is one of the mass traceability devices in the revised International System of Units, and its smooth operation relies on a compensation coil to reduce the effect of the external magnetic field. In this paper, the interaction between the magnetized coil-suspension system and the compensation coil is theoretically analyzed and experimentally verified. First, an additional induced voltage

    更新日期:2020-07-13
  • International pilot study CCQM-P193: 10 μmol mol −1 water vapour in nitrogen
    Metrologia (IF 2.28) Pub Date : 2020-07-02
    P J Brewer, B Gieseking, V F Ferracci, M Ward, P Carroll, S Bell and B Hall

    The measurement of trace amounts of water in process gases is of paramount importance to a number of manufacturing processes. Water is considered to be one of the most difficult impurities to remove from gas supply systems and there is strong evidence that the presence of water contamination in semiconductor gases has a measurable impact on the quality and performance of devices. Consequently, semiconductor

    更新日期:2020-07-05
  • Key comparison study on peptide purity - synthetic oxytocin
    Metrologia (IF 2.28) Pub Date : 2020-07-01
    R D Josephs, M Li, A Daireaux, T Choteau, G Martos, S Westwood, R I Wielgosz, H Li, S Wang, X Li, N Shi, P Wu, L Feng, T Huang, T Zhang, S Li, P J Beltrão,, A Marcos Saraiva, B C Garrido, S M Naressi Scapin, W Wollinger, Y Bacila Sade, M -P Thibeault, B B Stocks, J E Melanson, T Kinumi, M F Bin Rezali, M Öztug, Müslüm Akgöz and M Quaglia

    Under the auspices of the Protein Analysis Working Group (PAWG) of the Comité Consultatif pour la Quantité de Matière (CCQM) a key comparison, CCQM-K115.b, was coordinated by the Bureau International des Poids et Mesures (BIPM) and the Chinese National Institute of Metrology (NIM). Seven Metrology Institutes or Designated Institutes and the BIPM participated. Participants were required to assign the

    更新日期:2020-07-03
  • 更新日期:2020-06-26
  • Quantification of ferritin-bound iron in murine samples for Alzheimer’s disease studies using species-specific isotope dilution mass spectrometry
    Metrologia (IF 2.28) Pub Date : 2020-06-25
    A Tchaikovsky, A Schoeberl, H Schueffl, A Raab, S Emin, A Slany, P Heffeter, G Koellensperger and C Swart

    We have investigated species-specific isotope dilution mass spectrometry (IDMS) for the quantification of ferritin-bound iron in murine serum and brain. Therefore, fresh samples were analyzed using size exclusion chromatography inductively coupled plasma mass spectrometry (SEC-ICP-MS). Isotopically labeled ( 57 Fe)ferritin was used as calibrant for the quantification of ferritin-bound iron in murine

    更新日期:2020-06-26
  • New interpolating equations of ITS-90 for SPRTs and HTSPRTs for the temperature range 419.527 ° C–961.78 ° C
    Metrologia (IF 2.28) Pub Date : 2020-06-25
    J P Sun, T Li, X P Hao, J Pan and J X Zeng

    The subrange inconsistency (SRI) of the International Temperature Scale of 1990 (ITS-90) arises from the use of different interpolating equations for the same standard platinum resistance thermometers (SPRTs), called Type 1 non-uniqueness, and is a significant component of the uncertainty in the realization of the scale. In order to eliminate the SRI, new interpolating equations were proposed for the

    更新日期:2020-06-26
  • The self-attraction effect in an atom gravity gradiometer
    Metrologia (IF 2.28) Pub Date : 2020-06-25
    Heng Zhang, De-Kai Mao, Qin Luo, Zhong-Kun Hu, Le-Le Chen and Min-Kang Zhou

    The self-attraction effect (SAE) is an important systematic error in a high-precision atom interferometry gravimeter, which has been researched. In this paper, we use the finite element method (FEM) to calculate the SAE of an atom gravity gradiometer. In this way, the SAE of the gravity gradiometer is accurately determined, and the calculation result shows this effect is 235(8) E (1 E = 1 ##IMG## [http://ej

    更新日期:2020-06-26
  • Final report of the CCQM-K145: toxic and essential elements in bovine liver
    Metrologia (IF 2.28) Pub Date : 2020-06-23
    Jun Wang, Jingbo Chao, Chao Wei, Haifeng Li, Qian Wang, Panshu Song, Hai Lu, Yuanjing Zhou, Yichuan Tang, Song Wang, Lu Yang, Kenny Nadeau, Indu Gedara Pihillagawa, Monique E Johnson, Lee L Yu, Teemu Näykki, Timo Sara-Aho, Ramiro Pérez Zambra, Romina Napoli, Olaf Rienitz, Janine Noordmann, Carola Pape, Jessica Towara, Cheung Tsz-chun, Chu Hei-shing, Aleksei Stakheev, Vladimir Dobrovolskiy, Tatiana

    Liver plays a major role in metabolism and acts as a source of energy for the body by storing glycogen. With the growing interest and investigation in the biological effects in recent years, it is important and necessary to develop accurate and comparable analytical methods for elements in bio-samples. It has, however, been 10 years since the tissue sample (bovine liver) of CCQM-K49 key comparison

    更新日期:2020-06-25
  • CCQM-K122 "Anionic impurities and lead in salt solutions"
    Metrologia (IF 2.28) Pub Date : 2020-06-22
    Olaf Rienitz, Reinhard Jährling, Janine Noordmann, Carola Pape, Karin Röhker, Jochen Vogl, Judith Velina Lara Manzano, Wladyslaw Kozlowski, Rodrigo Caciano de Sena, Janaína Marques Rodrigues, Ariel Hernan Galli, Yong-Hyeon Yim, Kyoung-Seok Lee, Jong Hae Lee, Hyung-Sik Min, Chao Jingbo, Shi Naijie, Wang Qian, Tongxiang Ren, Wang Jun, Nongluck Tangpaisarnkul, Toshihiro Suzuki, Naoko Nonose, Zoltán Mester

    The determination of the mass fractions of bromide, sulfate, and lead as well as the isotopic composition of the lead (expressed as the molar mass and the amount fractions of all four stable lead isotopes) in an aqueous solution of sodium chloride with a mass fraction of 0.15 g/g was the subject of this comparison. Even though the mass fractions ranged from 3 μg/g (bromide) to 50 ng/g (lead), almost

    更新日期:2020-06-24
  • Final report on key comparison EURAMET.M.P-K1.c in the range 0.7 MPa to 7.0 MPa of gas gauge pressure
    Metrologia (IF 2.28) Pub Date : 2020-06-22
    Aykurt Altıntaş, Ilknur Koçaş, Yasin Durgut, Joseph Bartolo, Mercede Bergoglio, Lovorka Grgec Bermanec, Alen Bošnjaković, Sanja Burzić, Antoine Condereys, Miruna Dobre, Peter Farar, Paul Hetherington, Nieves Medina, Wladimir Sabuga, Oliver Ott, Thomas Konczak, Ion Sandu, Janez Setina, Dietmar Steindl, Csilla Vámossy, Bernard Waller, Christian Wuethrich, Adam Brzozowski, Jan van Geel, Sari Saxholm

    A EURAMET key comparison of the national pressure standards in the range 0.7 MPa to 7.0 MPa of gas gauge pressure was carried out. The circulation of the transfer standard began in November 2011 and lasted until November 2016. The measurand of the comparison was the effective area of the piston-cylinder assembly determined by gauge pressure measurements in the range from 0.7 MPa to 7.0 MPa. As the

    更新日期:2020-06-24
  • APMP supplementary comparison of air kerma in ISO 4037 wide and narrow series x-ray beams: APMP.RI(I)-S3
    Metrologia (IF 2.28) Pub Date : 2020-06-21
    D J Butler, N Saito, L Büeermann, J -H Lee, J Laban, S Srimanoroth, M S Kulkarni and N Tebekana

    The results of a regional supplementary comparison of air kerma standards from eight standards laboratories are presented. The three transfer ionisation chambers (two model Exradin A4 chambers and one Exradin A5 chamber manufactured by Standard Imaging, Inc, Middleton, MI, USA) were measured at each laboratory over the period 2013 to 2016. Air kerma calibration coefficients for the transfer instruments

    更新日期:2020-06-23
  • International comparison CCQM-K112 biogas
    Metrologia (IF 2.28) Pub Date : 2020-06-21
    Adriaan M H van der Veen, Ewelina T Zalewska, Deborah R van Osselen, Teresa E Fernández, Concepción Gómez, Jan Beránek, Rutger J Oudwater, Denise C Sobrinho, Mariana C Brum, Cristiane R Augusto, Judit Fükö, Tamás Büki, Zsófia Nagyné Szilági, Paul J Brewer, Michael L Downey, Richard C Brown, Miroslava Valkova, Zuzana Durisova, Karine Arrhenius, Bertil Magnusson, Haleh Yaghooby, Tanil Tarhan, Erinç Engin

    At the highest metrological level, biogas standards are commonly prepared gravimetrically as PSMs (primary standard mixtures). This international key comparison addresses the composition of biogas, to support calibration and measurement services for this renewable energy gas. The mixtures contain nitrogen, carbon dioxide, methane, ethane, propane, hydrogen and oxygen and represent the composition of

    更新日期:2020-06-23
  • Final report on EURAMET project 1395/EURAMET.M.FF-K4.1.2016: volume comparison at 20 L
    Metrologia (IF 2.28) Pub Date : 2020-06-21
    A Malengo, E Batista, R Arias, L Mićić, A Bošnjaković, M Mirjana, E Piluri, G K Svendsen, M de Huu, A Sarevska, M Mišovich, U Turnšek, A Xhuraj, M Miteva, I Milkamanavičienė, E Smits, J Á Terradillos González, P Wennergren, A Niessner, C Czibulka and M Benkova

    During the EURAMET TC-F annual meeting, held in Boras in 2015, it was agreed to perform the follow up of the CCM.FF-K4.1.2011 organized for the EURAMET NMIs for volume of liquids at 20 L. The transfer standard was a 20 L pipette supplied by CENAM. The participants of this comparison also involved in the comparison CCM.FF-K4.1.2011 were: CENAM, INRIM, IPQ, RISE and VSL, in total there were twenty-one

    更新日期:2020-06-23
  • Supplementary pressure comparison from 10 MPa to 100 MPa in hydraulic media at gauge mode
    Metrologia (IF 2.28) Pub Date : 2020-06-14
    Y Durgut, C Vámossy, N Petrovski, V Kaçarski, B Tomçini, P Djurić, Vulić, N Al-Jattal, B K Justice, H M Alotaibi, Naif A Alanazi, K Dapkeviciene, A Brzozowski, J Setina, L G Bermanec, J V Geel, S Saxholm, A Altintas, A Bošnjaković, Š Ališić and P Hetherington

    The regional supplementary comparison EURAMET.M.P-S13 for pressure measurements in liquid media from 10 MPa to 100 MPa was piloted by the TÜBİTAK UME Pressure Laboratory, Turkey. The transfer standard was a digital pressure gauge, serial number 116321, manufactured by Paroscientific Inc. Eighteen laboratories participated in this comparison. Fourteen laboratories are from EURAMET region; namely UME

    更新日期:2020-06-14
  • Comparison of Open and Solid Falling Retroreflector Gravimeters
    Metrologia (IF 2.28) Pub Date : 2020-06-14
    Neil Ashby and Derek van Westrum

    We study whether the optical properties of a solid glass retroreflector influence the value of the acceleration of gravity g determined by dropping both solid and open retroreflectors in an absolute ballistic gravimeter. The retroreflectors have equivalent optical centers and are dropped from the same height, at a fixed location, in the same gravimeter while recording time data corresponding to fixed

    更新日期:2020-06-14
  • The non-uniqueness of ITS-90 above the silver point and its impact on values of T − T 90
    Metrologia (IF 2.28) Pub Date : 2020-06-11
    Peter Saunders

    Non-uniqueness is a fundamental limit to the reproducibility of a defined temperature scale. In this paper, the non-uniqueness of temperatures, T 90 , on the International Temperature Scale of 1990 (ITS-90) above the silver point is fully investigated for the first time. The non-uniqueness arises from three causes: inconsistency in extrapolation with the choice of the three allowable ITS-90 reference

    更新日期:2020-06-11
  • Advances in traceable calibration of cylinder pressure transducers
    Metrologia (IF 2.28) Pub Date : 2020-06-11
    J Salminen, S Saxholm, J Hämäläinen and R Högström

    Accurate and reliable dynamic pressure measurements are needed for optimizing performance in modern combustion engines, manufacturing processes and aerospace applications. Besides fast pressure transients, these applications subject dynamic pressure transducers to elevated temperatures. Both of these quantities effect the sensitivity of transducers. Therefore, transducers should be calibrated at conditions

    更新日期:2020-06-11
  • Experimental quantum polarimetry using heralded single photons
    Metrologia (IF 2.28) Pub Date : 2020-06-11
    Seung-Jin Yoon, Joong-Sung Lee, Carsten Rockstuhl, Changhyoup Lee and Kwang-Geol Lee

    We perform experimental quantum polarimetry using a heralded single photon to analyze the optical activity of linearly polarized light traversing a chiral medium. Three kinds of estimators are considered to estimate the concentrations of sucrose solutions from measuring the rotation angle of the linear polarization of the output photons. Through repetition of independent and identical measurements

    更新日期:2020-06-11
  • Final report of EURAMET.M.G-K3 regional comparison of absolute gravimeters
    Metrologia (IF 2.28) Pub Date : 2020-06-07
    R Falk, V Pálinkáš, H Wziontek, A Rülke, M Val'ko, Ch Ullrich, H Butta, J Kostelecký, M Bilker-Koivula, J Näränen, A Prato, F Mazzoleni, C Kirbaş, İ Coşkun, M Van Camp, S Castelein, J D Bernard, A Lothhammer, M Schilling, L Timmen, D Iacovone, G Nettis, F Greco, A A Messina, R Reudink, M Petrini, P Dykowski, M Sękowski, J Janák, J Papčo, A Engfeldt and H Steffen

    The regional key comparison of absolute gravimeters, EURAMET.M.G-K3 and the simultaneously organized additional comparison, was held in Germany at the Geodetic Observatory Wettzell of the German Federal Agency for Cartography and Geodesy in the spring of 2018. Here we present the list of the participants who actually performed measurements during the comparison, the data submitted by the operators

    更新日期:2020-06-07
  • Supplementary comparison of instrument current transformers
    Metrologia (IF 2.28) Pub Date : 2020-06-04
    Alejandro Santos, Daniel Slomovitz, Gonzalo Aristoy, Rogelio Sandler, Jose Luis Casais, Patricia Casi de Olivera, Alvaro Zipaquira Triana, Julio Gonzalez, Sergio Ochoa Marquez and Enrico Mohns

    This report describes a supplementary comparison on current ratio at power frequencies. The traveling standard was a high precision current transformer. Frequencies of 50 Hz and 60 Hz were used with a current range between 5 A and 1000 A. Participants belong to SIM, except the national metrology institute of Germany, PTB, that belongs to EURAMET. The pilot institute was UTE, from Uruguay. The measurement

    更新日期:2020-06-04
  • Final report, on-going key comparison BIPM.QM-K1, ozone at ambient level, comparison with NILU, January 2018
    Metrologia (IF 2.28) Pub Date : 2020-06-01
    Joële Viallon, Faraz Idrees, Philippe Moussay, Robert Wielgosz and Leif Marsteen

    As part of the ongoing key comparison BIPM.QM-K1, a comparison has been performed between the ozone standard of Norway maintained by the Norwegian Institute for Air Research (NILU) and the common reference standard of the key comparison, maintained by the Bureau International des Poids et Mesures (BIPM). The instruments have been compared over a nominal ozone amount-of-substance fraction range from

    更新日期:2020-06-01
  • Final report, on-going key comparison BIPM.QM-K1, ozone at ambient level, comparison with EAA, September 2019
    Metrologia (IF 2.28) Pub Date : 2020-06-01
    Joële Viallon, Faraz Idrees, Philippe Moussay, Robert Wielgosz and Andreas Wolf

    As part of the ongoing key comparison BIPM.QM-K1, a comparison has been performed between the ozone standard of Austria maintained by the Environment Agency Austria (EAA) and the common reference standard of the key comparison, maintained by the Bureau International des Poids et Mesures (BIPM). The instruments have been compared over a nominal ozone amount-of-substance fraction range from 0 nmol/mol

    更新日期:2020-06-01
  • Traceability of digital 3-axis MEMS accelerometer: simultaneous determination of main and transverse sensitivities in the frequency domain
    Metrologia (IF 2.28) Pub Date : 2020-05-25
    Andrea Prato, Fabrizio Mazzoleni and Alessandro Schiavi

    Traceability of digital sensors is a metrological challenge, as well as a present priority, as stated within the emerging metrology requirements for the future in the Strategy 2017 to 2027 document of the Consultative Committee for Acoustics, Ultrasound, and Vibration of BIPM. From this perspective, in this paper, a calibration system for 3-axis digital MEMS accelerometers is described, in order to

    更新日期:2020-05-25
  • Standard platinum resistance thermometer interpolations in a revised temperature scale
    Metrologia (IF 2.28) Pub Date : 2020-05-25
    D R White and P M C Rourke

    The thermal metrology community is considering revising the International Temperature Scale of 1990 (ITS-90), motivated by the opportunity to improve the thermodynamic accuracy, reproducibility, and ease of use of the scale, as well as health and safety concerns with the use of mercury in the current scale. This paper considers the mathematical structure of the standard platinum resistance thermometer

    更新日期:2020-05-25
  • Absolute frequency measurement of the 1 S 0 – 3 P 0 transition of 171 Yb with a link to international atomic time
    Metrologia (IF 2.28) Pub Date : 2020-05-25
    Marco Pizzocaro, Filippo Bregolin, Piero Barbieri, Benjamin Rauf, Filippo Levi and Davide Calonico

    We report the absolute frequency measurement of the unperturbed optical clock transition 1 S 0 – 3 P 0 in 171 Yb performed with an optical lattice frequency standard. Traceability to the International System of Units is provided by a link to International Atomic Time. The measurement result is 518 295 836 590 863.61(13) Hz with a relative standard uncertainty of ##IMG## [http://ej.iop.org/images/0

    更新日期:2020-05-25
  • Melting and freezing behavior of pure Ni cells in alumina crucibles with different internal structures
    Metrologia (IF 2.28) Pub Date : 2020-05-25
    Yong-Gyoo Kim and Sunghun Kim

    Two pure Ni cells for thermocouple calibration were fabricated in alumina crucibles with different internal structures to investigate their melting and freezing behaviors. One of the produced crucibles had a smooth surface, and the other was made with internal circular grooves. The melting and freezing processes of each cell were investigated in 10 melting/freezing cycles using a type B thermocouple

    更新日期:2020-05-25
  • Emissivities of vacuum compatible materials: towards minimising blackbody radiation shift uncertainty in optical atomic clocks at room temperatures
    Metrologia (IF 2.28) Pub Date : 2020-05-25
    Piotr Ablewski, Marcin Bober and Michał Zawada

    We report the results of measurements of the total hemispherical emissivity coefficients of the most popular vacuum compatible materials used in designs of optical atomic clocks. The experimental vacuum test chamber was designed to precisely quantify the heat transfer between the material’s samples and a calibrated plate that serves as a thermometer. The temperatures of vacuum chamber’s internal surfaces

    更新日期:2020-05-25
  • The performance of the KIBB-g1 tabletop Kibble balance at NIST
    Metrologia (IF 2.28) Pub Date : 2020-05-25
    Leon Chao, Frank Seifert, Darine Haddad, Jon Pratt, David Newell and Stephan Schlamminger

    A tabletop-sized Kibble balance (KIBB-g1) designed to directly realize mass at the gram-level range with uncertainties on the order of parts in 10 6 has been developed at the National Institute of Standards and Technology (NIST). The masses of a nominally 5 g and 1 g weight were determined with ##IMG## [http://ej.iop.org/images/0026-1394/57/3/035014/metab507dieqn001.gif] standard uncertainties of 9

    更新日期:2020-05-25
  • Final report on supplementary regional comparison SIM.AUV.A-S2: calibration of pistonphone
    Metrologia (IF 2.28) Pub Date : 2020-05-17
    T A B Milhomem, Z M D Soares, G P Ripper, J P Ayala, G M Guevara, F A Serrano, A Solano, R P Wagner and P Hanes

    This document is the Final Report of the Inter-American Metrology System supplementary comparison on pistonphone calibration SIM.AUV.A-S2. Seven national metrology institutes participated on this comparison: CENAM/Mexico, INACAL/Peru, INMETRO/Brazil, INTI/Argentina, LACOMET/Costa Rica, NIST/USA and NRC/Canada and INMETRO was the pilot institute responsible for its coordination. One pistonphone was

    更新日期:2020-05-17
  • EURAMET supplementary comparison between INRiM and UME in Rockwell hardness scales (HRA - HRBW - HRC) - EURAMET.M.H-S1.a.b.c
    Metrologia (IF 2.28) Pub Date : 2020-05-06
    A Germak, C Kuzu, C Origlia and E Pelit

    This report describes a bilateral EURAMET supplementary comparison on Rockwell hardness scales of two national metrology institutes of Italy and Turkey, INRiM and UME, respectively. The pilot laboratory is INRiM in the comparison where three sets of hardness reference blocks for the Rockwell hardness scales of HRA, HRBW and HRC were used. Each set of blocks consists of four hardness reference blocks

    更新日期:2020-05-06
  • Second solar ultraviolet radiometer comparison campaign UVC-II
    Metrologia (IF 2.28) Pub Date : 2020-05-05
    Gregor Hülsen, Julian Gröbner, Alkis Bais, Mario Blumthaler, Henri Diémoz, David Bolsée, Ana Diaz, Ilias Fountoulakis, Erik Naranen, Josef Schreder, Facta Stefania and José Manuel Vilaplana Guerrero

    In 2017, PMOD/WRC organised the solar ultraviolet broadband radiometer comparison campaign UVC-II . All 75 participating instruments from all over the world were characterised in the laboratory of the World Calibration Center for UV (WCCUV) and calibrated outdoors relative to the Qasume reference spectroradiometer. After a three month calibration period, all devices were returned to their owners, accompanied

    更新日期:2020-05-05
  • Improved Raman pulse sequence for rotation measurements with atom interferometers
    Metrologia (IF 2.28) Pub Date : 2020-05-05
    Yu-Jie Tan, Miao-Miao Zhao, Pan-Pan Wang, Ya-Jie Wang, Yao-Yao Xu, Xiao-Chun Duan, Cheng-Gang Shao and Zhong-Kun Hu

    Since the double-loop atom interferometer consisting of Raman ##IMG## [http://ej.iop.org/images/0026-1394/57/3/035006/metab7174ieqn1.gif] {${\frac{\pi }{2}\!-\!\pi\!-\!\pi\!-\!\frac{\pi }{2}}$} four-pulse sequences can eliminate the dependence of the interferometric phase shift on the atomic initial velocity, it is widely used for rotation measurements. However, our research shows that by coupling

    更新日期:2020-05-05
  • Perchlorate ion standard solution: multipath titrimetric approach using three different stoichiometric reactions—towards the establishment of SI traceable chemical standards
    Metrologia (IF 2.28) Pub Date : 2020-05-05
    Toshiaki Asakai

    Analyses of chloride ions, and oxyanions of chlorine named hypochlorite, chlorite, chlorate and perchlorate ions, are of interest especially in the fields of controlling water and food qualities. Some of them do not exist as a certified reference material characterized by a metrologically valid procedure, and the lack of the standards currently creates problems with the instrumental analyses. This

    更新日期:2020-05-05
  • Sensing characteristics of photonic crystal fiber Sagnac interferometer based on novel birefringence and Vernier effect
    Metrologia (IF 2.28) Pub Date : 2020-05-05
    Qiang Liu, Liang Xing, Sicheng Yan, Liangliang Lv and Zhaoyang Liu

    In this paper, the sensing characteristics of a photonic crystal fiber (PCF) Sagnac interferometer based on flat-phase birefringence, zero-group birefringence and the Vernier effect have been studied. The temperature-sensitive liquid is filled into the air holes of the PCF. We realize flat-phase birefringence, by which the sensitivity can reach 4.9 nm/°C and 3.5 nm/°C. We find a new phenomenon in that

    更新日期:2020-05-05
  • On-site comparison of quantum Hall effect resistance standards of the KRISS and the BIPM: ongoing key comparison BIPM.EM-K12
    Metrologia (IF 2.28) Pub Date : 2020-05-04
    P Gournay, B Rolland, D -H Chae and W -S Kim

    The ongoing on-site comparison BIPM.EM-K12 is part of the BIPM programme implemented to verify the international coherence of the primary resistance standards. It allows National Metrology Institutes (NMIs) to validate their implementations of the quantum Hall effect (QHE) for dc resistance traceability by comparison to the reference maintained at the BIPM. The realization of the ohm from the QHE-based

    更新日期:2020-05-04
  • Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the NRC, Canada and the BIPM in mammography x-rays
    Metrologia (IF 2.28) Pub Date : 2020-05-04
    C Kessler, D T Burns, E Mainegra-Hing, H Shen and M R McEwen

    A key comparison has been made between the air-kerma standards of the NRC and the BIPM in mammography x ray beams. The results show the standards to be in agreement at the level of the combined standard uncertainty of 3.2 parts in 10 3 . The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database. == Main text To reach the main text

    更新日期:2020-05-04
  • Update of the BIPM comparison BIPM.RI(II)-K1.Ho-166m of activity measurements of the radionuclide 166m Ho to include the 2017 results of the NMISA (South Africa) and update of the KCRV
    Metrologia (IF 2.28) Pub Date : 2020-04-30
    C Michotte, S Courte, M Nonis, M W van Rooy, M J van Staden and J Lubbe

    Since 1989, 6 national metrology institutes (NMI) have submitted 7 samples of known activity of 166m Ho to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Ho-166m. The values of the activity submitted were between about 70 kBq and 470 kBq. The key comparison reference value (KCRV) has

    更新日期:2020-04-30
  • On-site comparison of quantum Hall effect resistance standards of the NIM and the BIPM: ongoing key comparison BIPM.EM-K12
    Metrologia (IF 2.28) Pub Date : 2020-04-30
    P Gournay, B Rolland, Y Lu and J Zhao

    The ongoing on-site comparison BIPM.EM-K12 is part of the BIPM programme implemented to verify the international coherence of the primary resistance standards. It allows National Metrology Institutes (NMIs) to validate their implementations of the quantum Hall effect (QHE) for dc resistance traceability by comparison to the reference maintained at the BIPM. The realization of the ohm from the QHE-based

    更新日期:2020-04-30
  • On using converging shock waves for pressure amplification in shock tubes
    Metrologia (IF 2.28) Pub Date : 2020-04-26
    S Sembian and M Liverts

    While conventional shock tubes have a distinct advantage in dynamic calibration methods due to their inherent capability to generate pressure pulses of desired amplitude and fast rise time, they are limited to the lower levels of the pressure amplitude realization range (≤7 MPa). With the increasing need for a traceable dynamic calibration standard across wider pressure ranges, a novel technique using

    更新日期:2020-04-26
  • First accuracy evaluation of the NRC-FCs2 primary frequency standard
    Metrologia (IF 2.28) Pub Date : 2020-04-26
    Scott Beattie, Bin Jian, John Alcock, Marina Gertsvolf, Rich Hendricks, Krzysztof Szymaniec and Kurt Gibble

    We report the first accuracy evaluation of NRC-FCs2, an atomic fountain clock developed at the National Research Council Canada. The short term stability at high atomic density is 1.1 × 10 −13 at 1 second of averaging time. The typical overall fractional type B uncertainty is 2.3 × 10 −16 . GNSS-based frequency comparisons of NRC-FCs2 with the SI second, as reported by the BIPM over fourteen months

    更新日期:2020-04-26
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