Pub Date : 2024-09-02DOI: 10.1088/0026-1394/61/1a/08012
Joële Viallon, Faraz Idrees, Philippe Moussay, Robert Wielgosz, Luuk Meijer, Adriaan van der Veen
Main textAs part of the ongoing key comparison BIPM.QM-K1, a comparison has been performed between the ozone standard of the Netherlands maintained by the Van Swinden Laboratorium (VSL) 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 fraction range of 0 nmol mol−1 to 500 nmol mol−1.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with VSL, April 2024","authors":"Joële Viallon, Faraz Idrees, Philippe Moussay, Robert Wielgosz, Luuk Meijer, Adriaan van der Veen","doi":"10.1088/0026-1394/61/1a/08012","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/08012","url":null,"abstract":"<title>Main text</title>As part of the ongoing key comparison BIPM.QM-K1, a comparison has been performed between the ozone standard of the Netherlands maintained by the Van Swinden Laboratorium (VSL) 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 fraction range of 0 nmol mol−1 to 500 nmol mol−1.To reach the main text of this paper, click on <ext-link xlink:href=\"https://www.bipm.org/documents/d/guest/bipm-qm-k1_vsl_2024\" xlink:type=\"simple\">Final Report</ext-link>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <ext-link xlink:href=\"https://www.bipm.org/kcdb/\" xlink:type=\"simple\">https://www.bipm.org/kcdb/</ext-link>.The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"24 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-20DOI: 10.1088/1681-7575/ad6a1e
Piotr Morzyński, Sławomir Bilicki, Marcin Bober, Domagoj Kovačić, Roman Ciuryło, Michał Zawada, Jerzy Nawrocki, Piotr Dunst, Takumi Kobayashi, Kazumoto Hosaka, Daisuke Akamatsu
We report a remote, intercontinental frequency comparison between 171Yb (NMIJ) and 88Sr (UMK) optical lattice clocks. The frequencies were compared via the Global Positioning System Precise Point Positioning technique over the period from 10 March 2020, 00:00 UTC until 15 March 2020, 00:00 UTC. The comparison of the optical clocks yields results with a relative frequency uncertainty of 6.3×10−15.
{"title":"Intercontinental frequency ratio measurement of 171 Yb and 88 Sr optical lattice clocks","authors":"Piotr Morzyński, Sławomir Bilicki, Marcin Bober, Domagoj Kovačić, Roman Ciuryło, Michał Zawada, Jerzy Nawrocki, Piotr Dunst, Takumi Kobayashi, Kazumoto Hosaka, Daisuke Akamatsu","doi":"10.1088/1681-7575/ad6a1e","DOIUrl":"https://doi.org/10.1088/1681-7575/ad6a1e","url":null,"abstract":"We report a remote, intercontinental frequency comparison between <sup>171</sup>Yb (NMIJ) and <sup>88</sup>Sr (UMK) optical lattice clocks. The frequencies were compared via the Global Positioning System Precise Point Positioning technique over the period from 10 March 2020, 00:00 UTC until 15 March 2020, 00:00 UTC. The comparison of the optical clocks yields results with a relative frequency uncertainty of <inline-formula>\u0000<tex-math><?CDATA $6.3times 10^{-15}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mn>6.3</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>15</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"metad6a1eieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>.","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"15 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-19DOI: 10.1088/0026-1394/61/1a/06011
Romain Coulon, Carine Michotte, Sammy Courte, Manuel Nonis, Vincent Gressier, Robert Brettner-Messler, Patrick Lobner, Isabelle Mercedes Taschwer
Main textSince 1976, 20 laboratories have submitted 59 samples of 57Co 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.Co-57. Recently, the BEV (Austria) participated in the comparison. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the CCRI(II)-S6.Co-57 comparison have been calculated and the results are given in the form of a table. A graphical representation is also given.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"Update of the BIPM comparison BIPM.RI(II)-K1.Co-57 of activity measurements of the radionuclide 57Co to include the 2023 result of the BEV (Austria)","authors":"Romain Coulon, Carine Michotte, Sammy Courte, Manuel Nonis, Vincent Gressier, Robert Brettner-Messler, Patrick Lobner, Isabelle Mercedes Taschwer","doi":"10.1088/0026-1394/61/1a/06011","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/06011","url":null,"abstract":"<title>Main text</title>Since 1976, 20 laboratories have submitted 59 samples of <sup>57</sup>Co 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.Co-57. Recently, the BEV (Austria) participated in the comparison. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the CCRI(II)-S6.Co-57 comparison have been calculated and the results are given in the form of a table. A graphical representation is also given.To reach the main text of this paper, click on <ext-link xlink:href=\"https://www.bipm.org/documents/d/guest/bipm-ri-ii-k1-co-57_bev_2023\" xlink:type=\"simple\">Final Report</ext-link>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <ext-link xlink:href=\"https://www.bipm.org/kcdb/\" xlink:type=\"simple\">https://www.bipm.org/kcdb/</ext-link>.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"5 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-19DOI: 10.1088/0026-1394/61/1a/06012
Romain Coulon, Carine Michotte, Sammy Courte, Manuel Nonis, Vincent Gressier, Jana Sochorová, Pavel Auerbach
Main textSince 2000, 8 laboratories have submitted 8 samples of 177Lu 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.Lu-177. Recently, the CMI (Czechia) participated in the comparison. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the CCRI(II)-K2.Lu-177 comparison have been calculated and the results are given in the form of a table. A graphical representation is also given.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
正文自 2000 年以来，已有 8 个实验室向国际参照系统（SIR）提交了 8 份 177Lu 样品，供国际计量局（BIPM）进行放射性活度比对，比对标识符为 BIPM.RI(II)-K1.Lu-177。最近，CMI（捷克）也参与了比对。通过 CCRI（II）-K2.Lu-177 比对，计算了在 SIR 中测量的或与 SIR 相关的每种等效放射性活度之间的等效度，并以表格形式给出了结果。如需阅读本文正文，请点击 "最终报告"。请注意，本文为 BIPM 关键比对数据库附录 B 中的内容 https://www.bipm.org/kcdb/.The 根据 CIPM 互认安排（CIPM MRA）的规定，最终报告已经过同行评审，并获准由 CCRI 发布。
{"title":"Update of the BIPM comparison BIPM.RI(II)-K1.Lu-177 of activity measurements of the radionuclide 177Lu to include the 2023 result of the CMI (Czechia)","authors":"Romain Coulon, Carine Michotte, Sammy Courte, Manuel Nonis, Vincent Gressier, Jana Sochorová, Pavel Auerbach","doi":"10.1088/0026-1394/61/1a/06012","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/06012","url":null,"abstract":"<title>Main text</title>Since 2000, 8 laboratories have submitted 8 samples of <sup>177</sup>Lu 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.Lu-177. Recently, the CMI (Czechia) participated in the comparison. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the CCRI(II)-K2.Lu-177 comparison have been calculated and the results are given in the form of a table. A graphical representation is also given.To reach the main text of this paper, click on <ext-link xlink:href=\"https://www.bipm.org/documents/d/guest/bipm-ri-ii-k1-lu-177_cmi_2023\" xlink:type=\"simple\">Final Report</ext-link>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <ext-link xlink:href=\"https://www.bipm.org/kcdb/\" xlink:type=\"simple\">https://www.bipm.org/kcdb/</ext-link>.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"74 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-14DOI: 10.1088/1681-7575/ad6b30
Edwin Chen, André Charbonneau, Marina Gertsvolf, Yunli Wang
Atomic clocks are the most accurate timekeeping instruments in the world and play a crucial role in numerous applications, notably in satellite navigation. Nonetheless, the accuracy of these clock signals is subject to anomalies, highlighting the importance of anomaly characterization and detection. In our study, we identify three types of anomalies in the phase data of atomic clocks—outliers, phase jumps and inflection points, and also frequency jumps in the frequency data, which corresponds to the inflection points. The novelty of our work lies in the application of machine learning methods for atomic clock anomaly detection (AD), as opposed to traditional algorithms. We introduce a variety of unsupervised AD and change point detection (CPD) algorithms from the realms of statistics and machine learning, propose a customized thresholding function for AD, and evaluate AD and CPD algorithms on both synthetic and real-world atomic clock data. Our experiments reveal that the subsequence local outlier factor algorithm achieves excellent performance in detecting outliers and phase jumps, but struggles with inflection points. Crucially, we found that the application of a CPD algorithm specifically for detecting the frequency jumps in frequency data substantially improves performance. Our study adopts unsupervised machine learning methods for AD provides robust detection strategies, thereby contributing an expanded understanding of the use of machine learning for clock data monitoring.
原子钟是世界上最精确的计时仪器，在众多应用中发挥着至关重要的作用，特别是在卫星导航方面。然而，这些时钟信号的准确性受到异常现象的影响，这凸显了异常特征描述和检测的重要性。在我们的研究中，我们发现了原子钟相位数据中的三种异常--异常值、相位跃变和拐点，以及与拐点相对应的频率数据中的频率跃变。与传统算法相比，我们工作的新颖之处在于将机器学习方法应用于原子钟异常检测（AD）。我们从统计学和机器学习领域引入了多种无监督 AD 和变化点检测 (CPD) 算法，为 AD 提出了一个定制的阈值函数，并在合成和真实世界的原子钟数据上评估了 AD 和 CPD 算法。我们的实验表明，子序列局部离群因子算法在检测离群值和相位跃迁方面表现出色，但在检测拐点方面却举步维艰。重要的是，我们发现应用 CPD 算法专门检测频率数据中的频率跃变，可以大幅提高性能。我们的研究采用了无监督机器学习方法，为 AD 提供了稳健的检测策略，从而拓展了机器学习在时钟数据监测中的应用。
{"title":"Anomaly detection for atomic clocks using unsupervised machine learning algorithms","authors":"Edwin Chen, André Charbonneau, Marina Gertsvolf, Yunli Wang","doi":"10.1088/1681-7575/ad6b30","DOIUrl":"https://doi.org/10.1088/1681-7575/ad6b30","url":null,"abstract":"Atomic clocks are the most accurate timekeeping instruments in the world and play a crucial role in numerous applications, notably in satellite navigation. Nonetheless, the accuracy of these clock signals is subject to anomalies, highlighting the importance of anomaly characterization and detection. In our study, we identify three types of anomalies in the phase data of atomic clocks—outliers, phase jumps and inflection points, and also frequency jumps in the frequency data, which corresponds to the inflection points. The novelty of our work lies in the application of machine learning methods for atomic clock anomaly detection (AD), as opposed to traditional algorithms. We introduce a variety of unsupervised AD and change point detection (CPD) algorithms from the realms of statistics and machine learning, propose a customized thresholding function for AD, and evaluate AD and CPD algorithms on both synthetic and real-world atomic clock data. Our experiments reveal that the subsequence local outlier factor algorithm achieves excellent performance in detecting outliers and phase jumps, but struggles with inflection points. Crucially, we found that the application of a CPD algorithm specifically for detecting the frequency jumps in frequency data substantially improves performance. Our study adopts unsupervised machine learning methods for AD provides robust detection strategies, thereby contributing an expanded understanding of the use of machine learning for clock data monitoring.","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"3 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-07DOI: 10.1088/0026-1394/61/1a/04009
Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina
National Metrology Institutes from 12 African countries, namely Egypt, Morocco, Ghana, Nigeria, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, Mauritius and South Africa have participated in an international supplementary comparison on the calibration of caliper. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"AFRIMETS supplementary comparison on calibration of caliper","authors":"Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina","doi":"10.1088/0026-1394/61/1a/04009","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04009","url":null,"abstract":"National Metrology Institutes from 12 African countries, namely Egypt, Morocco, Ghana, Nigeria, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, Mauritius and South Africa have participated in an international supplementary comparison on the calibration of caliper. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"43 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-07DOI: 10.1088/0026-1394/61/1a/04004
Ahmed ElMelegy, Lhossain Mechkour, Bede Obayi, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Zanele Nzimande and Patrick Masina
National Metrology Institutes from 8 African countries, namely Egypt, Morocco, Nigeria, Tanzania, Zambia, Zimbabwe, Botswana, and South Africa have participated in an international supplementary comparison on the calibration of feeler gauges. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"AFRIMETS supplementary comparison on calibration of feeler gauges","authors":"Ahmed ElMelegy, Lhossain Mechkour, Bede Obayi, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Zanele Nzimande and Patrick Masina","doi":"10.1088/0026-1394/61/1a/04004","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04004","url":null,"abstract":"National Metrology Institutes from 8 African countries, namely Egypt, Morocco, Nigeria, Tanzania, Zambia, Zimbabwe, Botswana, and South Africa have participated in an international supplementary comparison on the calibration of feeler gauges. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"22 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-07DOI: 10.1088/0026-1394/61/1a/04007
Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina
National Metrology Institutes from 11 African countries, namely Egypt, Morocco, Nigeria, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, Mauritius and South Africa have participated in an international supplementary comparison on the calibration of Dial Indicators. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"AFRIMETS supplementary comparison on calibration of dial gauge","authors":"Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina","doi":"10.1088/0026-1394/61/1a/04007","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04007","url":null,"abstract":"National Metrology Institutes from 11 African countries, namely Egypt, Morocco, Nigeria, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, Mauritius and South Africa have participated in an international supplementary comparison on the calibration of Dial Indicators. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"371 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-07DOI: 10.1088/0026-1394/61/1a/09003
C S Veldman, Dr Naveen Garg, Mr Pairoj Rattanangkul and Lic Federico A Serrano
Following the completion of the fifth CIPM key comparison (KC) in the area of vibration concerning sinusoidal acceleration, participating Regional Metrology Organizations (RMOs) have the responsibility to disseminate the Key Comparison Reference Values (KCRV) to non-participating National Metrology Institutes (NMIs), thereby establishing a traceable link between NMIs participating in regional comparisons and the KCRVs. The comparison results reported here have that objective. The comparison was piloted by AFRIMETS with participants from three NMIs, situated in two RMOs, namely SIM and APMP. The respective Degrees of Equivalence, linked to the KCRVs, are reported. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA). To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"Report on key comparison AFRIMETS.AUV.V-K5 and linking to CCAUV.V-K5","authors":"C S Veldman, Dr Naveen Garg, Mr Pairoj Rattanangkul and Lic Federico A Serrano","doi":"10.1088/0026-1394/61/1a/09003","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/09003","url":null,"abstract":"Following the completion of the fifth CIPM key comparison (KC) in the area of vibration concerning sinusoidal acceleration, participating Regional Metrology Organizations (RMOs) have the responsibility to disseminate the Key Comparison Reference Values (KCRV) to non-participating National Metrology Institutes (NMIs), thereby establishing a traceable link between NMIs participating in regional comparisons and the KCRVs. The comparison results reported here have that objective. The comparison was piloted by AFRIMETS with participants from three NMIs, situated in two RMOs, namely SIM and APMP. The respective Degrees of Equivalence, linked to the KCRVs, are reported. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA). To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"48 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-07DOI: 10.1088/0026-1394/61/1a/04005
Ahmed ElMelegy, Bede Obayi, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam and Ramasawmy Pallut
National Metrology Institutes from 8 African countries, namely Egypt, Nigeria, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, and Mauritius have participated in an international supplementary comparison on the calibration of setting rods. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
{"title":"AFRIMETS supplementary comparison on calibration of setting rods","authors":"Ahmed ElMelegy, Bede Obayi, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam and Ramasawmy Pallut","doi":"10.1088/0026-1394/61/1a/04005","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04005","url":null,"abstract":"National Metrology Institutes from 8 African countries, namely Egypt, Nigeria, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, and Mauritius have participated in an international supplementary comparison on the calibration of setting rods. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":"89 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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