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  • 1.
    Arrhén, Fredrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Mathematical modelling to support traceable dynamic calibration of pressure sensors2014In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 51, no 3, p. 326-338Article in journal (Refereed)
  • 2.
    Carlsson, G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Kastberg, A
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Pendrill, L
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Absolute wave-number measurement of CsD2 resonance line1997In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 34, no 5, p. 387-391Article in journal (Other academic)
  • 3.
    Frennberg, M, Sacconi A
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    International comparison of high-accuracy roundness measurements1996In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 33, no 6, p. 539-544Article in journal (Other academic)
  • 4.
    Haitjema, H
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Frennberg, Matz
    International comparison of roundness profiles with nanometric accuracy1996In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 33, no 1, p. 67-73Article in journal (Other academic)
  • 5.
    Hobiger, Thomas
    et al.
    Chalmers University of Technology, Sweden.
    Rieck, Carsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation. Chalmers University of Technology, Sweden.
    Rüdiger, Haas
    Chalmers University of Technology, Sweden.
    Koyama, Yasuhiro
    National Institute of Information and Communications Technology, Japan.
    Combining GPS and VLBI for inter-continental frequency transfer2015In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 52, no 2, p. 251-261Article in journal (Refereed)
    Abstract [en]

    For decades the global positioning system (GPS) has been the only space geodetic technique routinely used for inter-continental frequency transfer applications. In the past very long baseline interferometry (VLBI) has also been considered for this purpose and the method's capabilities were studied several times. However, compared to GPS current VLBI technology only provides few observations per hour, thus limiting its potential to improve frequency comparisons. We therefore investigate the effect of combining GPS and VLBI on the observation level in order to draw the maximum benefit from the strength of each individual technique. As a test-bed for our study we use the CONT11 campaign observed in 2011. First we review the frequency transfer performance that can be achieved with independent technique-specific analyses, both with individual software packages and with the multitechnique software c5++. With this analysis approach both techniques, GPS and VLBI, show similar frequency link instabilities at the level of 10 -14 to 10 -15 (MDEV) on inter-continental baselines for averaging times of one day. Then we use the c5++ software for a combined analysis of GPS and VLBI data on the observation level. We demonstrate that our combination approach leads to small but consistent improvements for frequency transfer of up to 10%, in particular for averaging periods longer than 3000 s.

  • 6.
    Jiang, Zhiheng
    et al.
    BIPM Bureau International des Poids et Mesures, France.
    Zhang, Victor
    NIST National Institute of Standards and Technology, USA.
    Huang, Yi-Jiun
    Telecommunication Laboratories, Chinese Taipei.
    Achkar, Joseph
    Sorbonne Université, France.
    Piester, Dirk
    PTB, Germany.
    Lin, Shinn-Yan
    Telecommunication Laboratories, Chinese Taipei.
    Wu, Wenjun
    National Time Service Center, China.
    Naumov, Andrey
    Main Metrological Center for State Service of Time and Frequency, Russia.
    Yang, Sung-hoon
    Korea Research Institute of Standards and Science, South Korea.
    Nawrocki, Jerzy
    Space Research Center Astrogeodynamic Observatory, Poland.
    Sesia, Ilaria
    Istituto Nazionale di Ricerca Metrologica, Italy.
    Schlunegger, Christian
    Federal Institute of Metrology METAS, Switzerland.
    Yang, Zhiqiang
    National institute of Metrology, China.
    Fujieda, Miho
    NICT National Institute of Information and Communications Technology, Japan.
    Czubla, Albin
    Central Office of Measures, Poland.
    Esteban, Hector
    ROA Real Instituto y Observatorio de la Armada, Spain.
    Rieck, Carsten
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Whibberley, Peter
    NPL National Physical Laboratory, UK.
    Use of software-defined radio receiversin two-way satellite time and frequencytransfers for UTC computation2018In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 55, p. 685-698Article in journal (Refereed)
    Abstract [en]

    Two-way satellite time and frequency transfer (TWSTFT) is a primary technique for thegeneration of coordinated universal time (UTC). About 20 timing laboratories around theworld continuously operate TWSTFT using satellite time and ranging equipment (SATRE19)modems for remote time and frequency comparisons in this context. The precision of theSATRE TWSTFT as observed today is limited by an apparent daily variation pattern (diurnal)in the TWSTFT results. The observed peak-to-peak variation have been found as high as 2 nsin some cases. Investigations into the origins of the diurnals have so far provided no completeunderstanding about the cause of the diurnals. One major contributor to the diurnals, however,could be related to properties of the receive part in the modem. In 2014 and 2015, it wasdemonstrated that bypassing the receive part and the use of software-defined radio (SDR) receivers in TWSTFT ground stations (SDR TWSTFT) instead could considerably reduce boththe diurnals and the measurement noise.In 2016, the International Bureau of Weights and Measures (BIPM) and the ConsultativeCommittee for Time and Frequency (CCTF) working group (WG) on TWSTFT launched a pilotstudy on the application of SDR receivers in the TWSTFT network for UTC computation.The first results of the pilot study were reported to the CCTF WG on TWSTFT annualmeeting in May 2017, demonstrating that SDR TWSTFT shows superior performancecompared to that of SATRE TWSTFT for practically all links between participating stations.In particular, for continental TWSTFT links, in which the strongest diurnals appear, the useof SDR TWSTFT results in a significant suppression of the diurnals by a factor of betweentwo and three. For the very long inter-continental links, e.g. the Europe-to-USA links wherethe diurnals are less pronounced, SDR TWSTFT achieved a smaller but still significant gainof 30%. These findings are supported by an evaluation of some of the links with an alternatetechnique based on GPS signals (GPS IPPP) as reported in this paper.Stimulated by these results, the WG on TWSTFT prepared a recommendation for the 21stCCTF meeting, which proposed the introduction of SDR TWSTFT in UTC generation. WithCCTF approval of the recommendation, a roadmap was developed for the implementationof SDR TWSTFT in UTC generation. In accordance with the roadmap, most of the stationsthat participated in the pilot study have updated the SDR TWSTFT settings to facilitatethe use of SDR TWSTFT data in UTC generation. In addition, the BIPM conducted a finalevaluation to validate the long-term stability of SDR TWSTFT links, made test runs using theBIPM standard software for the calculation of UTC, now including SDR TWSTFT data, andstarted to calculate SDR TWSTFT time links as backup from October 2017. The use of SDRTWSTFT in UTC generation will begin in 2018.

  • 7.
    Jiang, Zhiheng
    et al.
    BIPM Bureau International des Poids et Mesures, France.
    Zhang, Victor S.
    NIST National Institute of Standards and Technology, USA.
    Huang, Yi Jiun
    TL National Standard Time and Frequency Laboratory, Taiwan.
    Achkar, Joseph
    Observatoire de Paris, France.
    Piester, Dirk
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Lin, Shinn Yan Calvin
    TL National Standard Time and Frequency Laboratory, Taiwan.
    Wu, Wenjun
    NTSC National Time Service Center, China.
    Naumov, Andrey
    Main Metrological Center for State Service of Time and Frequency, Russia.
    Yang, Sunghoon
    KRISS: Korea Research Institute of Standards and Science, South Korea.
    Nawrocki, Jerzy
    AOS Space Research Center, Poland.
    Sesia, Ilaria
    INRIM Istituto Nazionale di Ricerca Metrologica, Italy.
    Schlunegger, Christian
    Metas Federal Institute of Metrology, Switzerland.
    Yang, Zhiqiang
    NIM National Institute of Metrology, China.
    Fujieda, Miho
    NICT National Institute of Information and Communications Technology, Japan.
    Czubla, Albin
    Central Office of Measures, Poland.
    Esteban, Hector
    Real Instituto y Observatorio de la Armada, Spain.
    Rieck, Carsten
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Whibberley, Peter B.
    NPL National Physical Laboratory, UK.
    Use of software-defined radio receivers in two-way satellite time and frequency transfers for UTC computation2018In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 55, no 5, p. 685-698Article in journal (Refereed)
    Abstract [en]

    Two-way satellite time and frequency transfer (TWSTFT) is a primary technique for the generation of coordinated universal time (UTC). About 20 timing laboratories around the world continuously operate TWSTFT using satellite time and ranging equipment (SATRE19) modems for remote time and frequency comparisons in this context. The precision of the SATRE TWSTFT as observed today is limited by an apparent daily variation pattern (diurnal) in the TWSTFT results. The observed peak-to-peak variation have been found as high as 2 ns in some cases. Investigations into the origins of the diurnals have so far provided no complete understanding about the cause of the diurnals. One major contributor to the diurnals, however, could be related to properties of the receive part in the modem. In 2014 and 2015, it was demonstrated that bypassing the receive part and the use of software-defined radio (SDR) receivers in TWSTFT ground stations (SDR TWSTFT) instead could considerably reduce both the diurnals and the measurement noise. In 2016, the International Bureau of Weights and Measures (BIPM) and the Consultative Committee for Time and Frequency (CCTF) working group (WG) on TWSTFT launched a pilot study on the application of SDR receivers in the TWSTFT network for UTC computation. The first results of the pilot study were reported to the CCTF WG on TWSTFT annual meeting in May 2017, demonstrating that SDR TWSTFT shows superior performance compared to that of SATRE TWSTFT for practically all links between participating stations. In particular, for continental TWSTFT links, in which the strongest diurnals appear, the use of SDR TWSTFT results in a significant suppression of the diurnals by a factor of between two and three. For the very long inter-continental links, e.g. the Europe-to-USA links where the diurnals are less pronounced, SDR TWSTFT achieved a smaller but still significant gain of 30%. These findings are supported by an evaluation of some of the links with an alternate technique based on GPS signals (GPS IPPP) as reported in this paper. Stimulated by these results, the WG on TWSTFT prepared a recommendation for the 21st CCTF meeting, which proposed the introduction of SDR TWSTFT in UTC generation. With CCTF approval of the recommendation, a roadmap was developed for the implementation of SDR TWSTFT in UTC generation. In accordance with the roadmap, most of the stations that participated in the pilot study have updated the SDR TWSTFT settings to facilitate the use of SDR TWSTFT data in UTC generation. In addition, the BIPM conducted a final evaluation to validate the long-term stability of SDR TWSTFT links, made test runs using the BIPM standard software for the calculation of UTC, now including SDR TWSTFT data, and started to calculate SDR TWSTFT time links as backup from October 2017. The use of SDR TWSTFT in UTC generation will begin in 2018.

  • 8.
    Mari, Luca
    et al.
    Università Cattaneo LIUC, Italy.
    Ehrlich, Charles
    NIST National Institute of Standards and Technology, USA.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Measurement units as quantities of objects or values of quantities: a discussion2018In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 55, no 5, p. 716-721Article in journal (Refereed)
    Abstract [en]

    Measurement units have historically been defined as quantities (i.e., specific properties) of objects, such as the mass of a particular piece of metal or the length of a particular rod. While the current International System of Units (SI) Brochure endorses this position, the draft 9th SI Brochure proposes to change it, and instead define measurement units as values of quantities. The reason for this proposed change is not provided, but it does not seem plausible that it is related to the redefinition of the SI units in terms of fundamental constants of nature: the very concept of what a unit is does not depend on the concrete way any given unit is defined. This paper is intended to open a discussion of whether measurement units should be defined as quantities or as quantity values, and provides our rationale for maintaining the definition of units as quantities.

  • 9. Martín, Ricardo
    et al.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Hällström, J
    Final report on supplementary comparison EURAMET.EM-S29: Traceability of DC high voltage reference measuring systems up to 200 kV2012In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 49, p. 1001-Article in journal (Refereed)
    Abstract [en]

    The purpose of the EURAMET supplementary comparison EURAMET.EM-S29 was to compare the calibration and measurement capabilities of the participating institutes. The pilot laboratory was the Laboratorio Central Oficial de Electrotecnia (LCOE, Madrid, Spain), and the other participants were the following other six EURAMET national metrology institutes: BIM (Bulgaria), MIKES (Finland), PTB (Germany), SP (Sweden), UME (Turkey) and VSL (The Netherlands), and the COOMET national institute VNIIMS (Russia). A 200 kV DC reference measuring system provided by LCOE was used as a travelling reference measuring system (TRMS). The comparison measurements were carried out between November 2007 and April 2010. According to the technical protocol, two different types of measurements had to be made: determination of the assigned scale factor of the TRMS between 1 kV and 200 kV, positive and negative polarity, and short-term stability of the measuring systems used. For each voltage level and polarity, a comparison reference value was calculated. Compatibility of each participant with the corresponding comparison reference values and between any pair of laboratories was also obtained. Results of the comparison offered a good opportunity to check the calibration and measurement capabilities of the participants in the field of high voltage DC measurement. The reported results also demonstrate the importance of taking care in order to cancel the influence of the self-heating of the TRMS. Main text. To reach the main text of this paper, click on Final Report [http://www.bipm.org/utils/common/pdf/final_reports/EM/S29/EURAMET.EM-S29.pdf] . Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/ [http://kcdb.bipm.org/] . The final report has been peer-reviewed and approved for publication by EURAMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

  • 10.
    Matus, M.
    et al.
    BEV Federal Office of Metrology and Surveying, Austria.
    Haas, S.
    BEV Federal Office of Metrology and Surveying, Austria.
    Piree, H.
    SMD Service Métrologie Scientifique, Belgium.
    Gavalyugov, V.
    BIM Bulgarian Institute of Metrology, Bulgaria.
    Tamakyarska, D.
    BIM Bulgarian Institute of Metrology, Bulgaria.
    Thalmann, R.
    METAS Federal Institute of Metrology, Switzerland.
    Balling, P.
    CMI Czech Metrology Institute, Czech Republic.
    Garnæs, J.
    DFM Danish Fundamental Metrology, Denmark.
    Hald, J.
    DFM Danish Fundamental Metrology, Denmark.
    Farid, N.
    NIS National Institute of Standards, Egypt.
    Prieto, E.
    CEM Centro Espanol de Metrologia, Spain.
    Lassila, A.
    MIKES Centre for Metrology and Accreditation, Finland.
    Salgado, J. A.
    LNE Laboratoire National de Métrologie et d'Essais, France.
    Lewis, A.
    NPL National Physical Laboratory, UK.
    Bandis, C.
    EIM Hellenic Institute of Metrology, Greece.
    Mudronja, V.
    HMI Croatian Metrology Institute, Croatia.
    Banreti, E.
    MKEH Hungarian Trade Licensing Office, Hungary.
    Balsamo, A.
    INRIM Istituto Nazionale di Ricerca Metrologica, Italy.
    Pedone, P.
    INRIM Istituto Nazionale di Ricerca Metrologica, Italy.
    Bergmans, R.
    VSL Dutch Metrology Institute, Netherlands.
    Karlsson, H.
    JV Norwegian Metrology Service, Norway.
    Ramotowski, Z.
    GUM Central Office of Measures, Poland.
    Eusébio, L.
    IPQ Portuguese Quality Institute, Portugal.
    Saraiva, F.
    IPQ Portuguese Quality Institute, Portugal.
    Duta, A.
    INM National Institute of Metrology, Romania.
    Zelenika, S.
    DMDM Directorate of Measures and Precious Metals, Serbia.
    Bergstrand, Sten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Fira, R.
    SMU Slovak Institute of Metrology, Slovakia.
    Yandayan, T.
    TÜBİTAK UME National Metrology Institute, Turkey.
    Şendoğdu, D.
    TÜBİTAK UME National Metrology Institute, Turkey.
    Ganioğlu, O.
    TÜBİTAK UME National Metrology Institute, Turkey.
    Akgöz, S. A.
    TÜBİTAK UME National Metrology Institute, Turkey.
    Franke, P.
    NPL National Physical Laboratory, UK.
    Key Comparison EURAMET.L-K1.2011 Measurement of gauge blocks by interferometry2016In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 53, no 1AArticle in journal (Refereed)
    Abstract [en]

    The key comparison EURAMET.L-K1.2011 on gauge blocks was carried out in the framework of a EURAMET project starting in 2012 and ending in 2015. It involved the participation of 24 National Metrology Institutes from Europe and Egypt, respectively. 38 gauge blocks of steel and ceramic with nominal central lengths between 0.5 mm and 500 mm were circulated. The comparison was conducted in two loops with two sets of artifacts. A statistical technique for linking the reference values was applied. As a consequence the reference value of one loop is influenced by the measurements of the other loop although they did not even see the artifacts of the others. This influence comes solely from three "linking laboratories" which measure both sets of artifacts. In total there were 44 results were not fully consistent with the reference values. This represents 10% of the full set of 420 results which is a considerable high number. At least 12 of them are clearly outliers where the participants have been informed by the pilot as soon as possible. The comparison results help to support the calibration and measurement capabilities (CMCs) of the laboratories involved in the CIPM MRA.

  • 11.
    Medvedevskikh, Maria
    et al.
    UNIIM Ural Scientific Research Institute for Metrology, Russia.
    Krasheninina, Maria
    UNIIM Ural Scientific Research Institute for Metrology, Russia.
    Rego, Elaine C. P. D.
    INMETRO National Institute of Metrology, Quality and Technology, Brazil.
    Wollinger, Wagner
    INMETRO National Institute of Metrology, Quality and Technology, Brazil.
    Monteiro, Taina M.
    INMETRO National Institute of Metrology, Quality and Technology, Brazil.
    Carvalho, Lucas J. D.
    INMETRO National Institute of Metrology, Quality and Technology, Brazil.
    Garcia, Steve Ali Acco
    INACAL Instituto Nacional de Calidad, Peru.
    Haraldsson, Conny
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Rodriguez, M Alejandra
    INTI National Institute of Industrial Technology, Argentina.
    Rodriguez, Gabriella
    INTI National Institute of Industrial Technology, Argentina.
    Salvo, Karino
    LATU Laboratorio Tecnológico del Uruguay, Uruguay.
    Gavrilkin, Vladimir
    UkrCSM State Enterprise All-Ukrainian State Research and production Center of Standardization Metrology, Certification and Consumers' Rights Protection, Ukraine.
    Kulyk, Sergiy
    UkrCSM State Enterprise All-Ukrainian State Research and production Center of Standardization Metrology, Certification and Consumers' Rights Protection, Ukraine.
    Samuel, Laly
    MSL Measurement Standards Laboratory of New Zealand, New Zealand.
    Report of the CCQM-K130: Nitrogen mass fraction measurements in glycine2017In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 54, no 1AArticle in journal (Refereed)
    Abstract [en]

    Mass fraction of nitrogen is very important pointer because the results of these measurements are often used for determination of protein mass fraction that is an important indicator of the quality of the vast majority of food products and raw materials, in particular dry milk powder. Proteins-enzymes catalyze chemical reactions, protein along with fats and carbohydrates is one of the indicators characterizing the energy value of food, so its definition is mandatory for all food products. The aim of this key comparison CCQM-K130 and pilot study P166 is to support National Measurement Institutes (NMIs) and Designated Institutes (DIs) to demonstrate the validity of the procedures the employed for determination of nitrogen mass fraction in glycine. The study material for this key comparison and pilot study has been selected to be representative as one of the aminoacid-the simplest part of the protein. Glycine is an amino acid, single acid that does not have any isomers (melting point-290 °C; specific heat of evaporation-528,6 J/kg; specific melting heat-981,1 J/kg; pKa-2,34, molar mass-75,07 g/mol, density-1,607 g/cm3). Ural Scientific Research Institute for Metrology (UNIIM) acted as the coordinating laboratory of this comparison and pilot study. Eight NMIs participated in this key comparison and two NMIs participated in Pilot study. The results of Pilot study are excluded from the Report B.

  • 12.
    Pendrill, Leslie
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Revision of the 'Guide to the Expression of Uncertainty in Measurement'2012In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 49, no 6, p. 702-705Article in journal (Refereed)
    Abstract [en]

    The Joint Committee for Guides in Metrology, Working Group 1, JCGM-WG1, is currently revising the 'Guide to the Expression of Uncertainty in Measurement'. In this communication, the motivation for undertaking such a revision is given and the main changes with respect to the current, 2008 edition are outlined.

  • 13.
    Pendrill, Leslie
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Using measurement uncertainty in decision-making & conformity assessment2014In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 51, p. S206-S218Article in journal (Refereed)
    Abstract [en]

    Measurements often provide an objective basis for making decisions, perhaps when assessing whether a product conforms to requirements or whether one set of measurements differs significantly from another. There is increasing appreciation of the need to account for the role of measurement uncertainty when making decisions, so that a 'fit-for-purpose' level of measurement effort can be set prior to performing a given task. Better mutual understanding between the metrologist and those ordering such tasks about the significance and limitations of the measurements when making decisions of conformance will be especially useful. Decisions of conformity are, however, currently made in many important application areas, such as when addressing the grand challenges (energy, health, etc), without a clear and harmonized basis for sharing the risks that arise from measurement uncertainty between the consumer, supplier and third parties. In reviewing, in this paper, the state of the art of the use of uncertainty evaluation in conformity assessment and decision-making, two aspects in particular—the handling of qualitative observations and of impact—are considered key to bringing more order to the present diverse rules of thumb of more or less arbitrary limits on measurement uncertainty and percentage risk in the field. (i) Decisions of conformity can be made on a more or less quantitative basis—referred in statistical acceptance sampling as by 'variable' or by 'attribute' (i.e. go/no-go decisions)—depending on the resources available or indeed whether a full quantitative judgment is needed or not. There is, therefore, an intimate relation between decision-making, relating objects to each other in terms of comparative or merely qualitative concepts, and nominal and ordinal properties. (ii) Adding measures of impact, such as the costs of incorrect decisions, can give more objective and more readily appreciated bases for decisions for all parties concerned. Such costs are associated with a variety of consequences, such as unnecessary re-manufacturing by the supplier as well as various consequences for the customer, arising from incorrect measures of quantity, poor product performance and so on.

  • 14.
    Stahlberg, B Pendrill
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    L, Kärn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    International comparisons of He-Ne lasers stabilized with 127I2 at lambda=633 nm (July 1993 to September 1995). Part I: Second comparison of Northern European lasers at lambda=633 nm1997In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 34, no 4, p. 301-307Article in journal (Other academic)
  • 15.
    Stock, KD Liedquist, Leif et al
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Detector-stabilzed FEL lamps as transfer standards in an international comparison of spectral irradiance2000In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 37, no 5, p. 441-444Article in journal (Other academic)
  • 16.
    Thalmann, R.
    et al.
    METAS Federal Institute of Metrology, Switzerland.
    Nicolet, A.
    METAS Federal Institute of Metrology, Switzerland.
    Meli, F.
    METAS Federal Institute of Metrology, Switzerland.
    Picotto, G. B.
    INRIM Istituto Nazionale di Ricerca Metrologica, Italy.
    Matus, M.
    BEV Federal Office of Metrology and Surveying, Austria.
    Carcedo, L.
    CEM Centro Espanol de Metrologia, Spain.
    Hemming, B.
    MIKES Centre for Metrology and Accreditation, Finland.
    Ganioğlu, O.
    TÜBİTAK UME National Metrology Institute, Turkey.
    De Chiffre, L.
    DTU Technical University of Denmark, Denmark.
    Saraiva, F.
    IPQ Portuguese Quality Institute, Portugal.
    Bergstrand, Sten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Zelenika, S.
    DMDM Directorate of Measures and Precious Metals, Serbia.
    Tonmueanwai, A.
    NIMT National Institute of Metrology, Thailand.
    Tsai, C. -L.
    CMS Center for Measurement Standards, Taiwan.
    Shihua, W.
    NMC National Metrology Centre, Singapore.
    Kruger, O.
    NMISA National Metrology Institute of South Africa, South Africa.
    de Souza, M. M.
    INMETRO National Institute of Metrology Standardization and Industrial Quality, Brazil.
    Salgado, J. A.
    LNE Laboratoire National de Métrologie et d'Essais, France.
    Ramotowski, Z.
    GUM Central Office of Measures, Poland.
    Key comparison EURAMET.L-K8.2013 calibration of surface roughness standards2016In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 53, no 1AArticle in journal (Refereed)
    Abstract [en]

    The key comparison EURAMET.L-K8.2013 on roughness was carried out in the framework of a EURAMET project starting in 2013 and ending in 2015. It involved the participation of 17 National Metrology Institutes from Europe, Asia, South America and Africa representing four regional metrology organisations. Five surface texture standards of different type were circulated and on each of the standards several roughness parameters according to the standard ISO 4287 had to be determined. 32 out of 395 individual results were not consistent with the reference value. After some corrective actions the number of inconsistent results could be reduced to 20, which correspond to about 5% of the total and can statistically be expected. In addition to the material standards, two softgauges were circulated, which allow to test the software of the instruments used in the comparison. The comparison results help to support the calibraton and measurement capabilities (CMCs) of the laboratories involved in the CIPM MRA.

  • 17.
    Zelan, Martin
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Arrhén, Fredrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Jarlemark, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Mollmyr, Oscar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Håkan
    Simea Optics AB, Sweden.
    Characterization of a fiber-optic pressure sensor in a shock tube system for dynamic calibrations2015In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 52, no 1, p. 48-53Article in journal (Refereed)
    Abstract [en]

    Measurements of mechanical quantities such as pressure often take place under dynamic conditions, yet no traceable standards for the primary dynamic calibration of pressure sensors currently exist. In theory, shock tubes can provide a close to perfect step-function ideal for the calibration of pressure transducers. In this paper we investigate a system consisting of a shock tube and an ultra-fast fiber-optical sensor that is designed to be a future primary system for dynamic pressure calibrations. For reference, the fiber-optical sensor is compared to a piezoelectric sensor, and their corresponding frequency spectra are calculated. Furthermore, an investigation of the repeatability of the fiber-optical sensor, as well as a comparison with a second shock tube, is performed.

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