scholarly journals BIPM and IUPAC formalize a long-standing cooperation

2020 ◽  
Vol 42 (1) ◽  
pp. 27
Keyword(s):  
National Metrology Institutes

AbstractIUPAC has signed a Memorandum of Understanding with the Bureau International des Poids et Mesures (BIPM). Signed on 17 October 2019 at the BIPM during the meeting of the National Metrology Institutes (NMI) Directors, the MoU formalizes the long-standing cooperation between the BIPM and IUPAC.

A comparison of traceable spatial angle autocollimator calibrations performed by PTB and VTT MIKES

Metrologia ◽  
2021 ◽  
Author(s):  
Ralf D Geckeler ◽  
Matthias Schumann ◽  
Andreas Just ◽  
Michael Krause ◽  
Antti Lassila ◽  
...  
Keyword(s):  
Broad Spectrum ◽  
Measurement Errors ◽  
Systematic Measurement ◽  
Motivating Factors ◽  
Optical Surface ◽  
Transfer Standard ◽  
Surface Normal ◽  
National Metrology Institutes ◽  
Wide Range ◽  
The Creation

Abstract Autocollimators are versatile devices for angle metrology used in a wide range of applications in engineering and manufacturing. A modern electronic autocollimator generally features two measuring axes and can thus fully determine the surface normal of an optical surface relative to it in space. Until recently, however, the calibration capabilities of the national metrology institutes were limited to plane angles. Although it was possible to calibrate both measuring axes independently of each other, it was not feasible to determine their crosstalk if angular deflections were present in both axes simultaneously. To expand autocollimator calibrations from plane angles to spatial angles, PTB and VTT MIKES have created dedicated calibration devices which are based on different measurement principles and accomplish the task of measurand traceability in different ways. Comparing calibrations of a transfer standard makes it possible to detect systematic measurement errors of the two devices and to evaluate the validity of their uncertainty budgets. The importance of measurand traceability via calibration for a broad spectrum of autocollimator applications is one of the motivating factors behind the creation of both devices and for this comparison of the calibration capabilities of the two national metrology institutes. The latter is the focus of the work presented here.

Major applications of electrochemical techniques at national metrology institutes

Metrologia ◽  
2009 ◽  
Vol 46 (3) ◽  
pp. 199-213 ◽  
Author(s):  
Michal Máriássy ◽  
Kenneth W Pratt ◽  
Petra Spitzer
Keyword(s):  
Electrochemical Techniques ◽  
National Metrology Institutes

Metrology for Climate Sciences: The European Metrology Network for Climate and Ocean Observation

2020 ◽  
Author(s):  
Emma Woolliams ◽  
Paola Fisicaro ◽  
Nigel Fox ◽  
Céline Pascale ◽  
Steffen Seitz ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Best Practice ◽  
Global Climate ◽  
Critical Role ◽  
Earth Observation ◽  
Seasonal Effects ◽  
Climate Trend ◽  
National Metrology Institutes ◽  
Wide Range

<div> <p>Environmental observations of essential climate variables (ECVs) and related quantities made by satellites and in situ observational networks are used for a wide range of societal applications. To identify a small climate trend from an observational record that is also sensitive to changes in weather, to seasonal effects and to geophysical processes, it is essential that observations have a stable basis that holds for multiple decades, whilst still allowing for changes in the observation instrumentation and operational procedures. To achieve this, all aspects of data collection and handling must be underpinned by robust quality assurance. The resultant data should also be linked to a common reference, with well-understood uncertainty analysis, so that observations are interoperable and coherent; in other words, measurements by different organisations, different instruments and different techniques should be able to be meaningfully combined and compared.    </p> </div><div> <p>Metrology, the science of measurement, can provide a critical role in enabling robust, interoperable and stable observational records and can aid users in judging the fitness-for-purpose of such records. In addition to Global Climate Observing System (GCOS) monitoring principles, metrology’s value, and the role of National Metrology Institutes (NMI) in observations, has been recognised in initiatives such as the Quality Assurance Framework for Earth Observation (QA4EO) established by the Committee on Earth Observation Satellites (CEOS) and in the implementation plans of the World Meteorological Organization’s (WMO’s), Global Atmosphere Watch and the European Ocean Observing System.  </p> </div><div> <p>The European Association for National Metrology Institutes (EURAMET) has recently created the “European Metrology Network (EMN) for Climate and Ocean Observation” to support further engagement of the expert communities with metrologists at national metrology insitutes and to encourage Europe’s metrologists to coordinate their research in response to community needs. The EMN has a scope that covers metrological support for in situ and remote sensing observations of atmosphere, land and ocean ECVs (and related parameters) for climate applications. It also covers the additional economic and ecological applications of ocean Essential Ocean Variable (EOV) observations. It is the European contribution to a global effort to further enhance metrological best practice into such observations through targeted research efforts.  </p> </div><div> <p>In late 2019 and early 2020 the EMN carried out a survey to identify the need for metrology within the observational communities and held a webinar workshop to prioritise the identified needs. Here we present the results of the survey and discuss the role that metrology can play in the climate observing system of the future. </p> </div>

Contemporary evaluation of measurement uncertainties in vector network analysis

2017 ◽  
Vol 84 (5) ◽  
Author(s):  
Markus Zeier ◽  
Johannes Hoffmann ◽  
Juerg Ruefenacht ◽  
Michael Wollensack
Keyword(s):  
Network Analysis ◽  
Technical Progress ◽  
New Method ◽  
Uncertainty Evaluation ◽  
National Metrology Institutes ◽  
Measurement Uncertainties ◽  
Calibration Laboratories

AbstractThe evaluation of measurement uncertainties in vector network analysis is a demanding task. The metrology guide EURAMET cg-12 (formerly EA 10/12) is dedicated to this topic and serves as a guideline for calibration laboratories and national metrology institutes. The guide has been revised, acknowledging the technical progress in the field. The new method is in agreement with relevant standards on uncertainty evaluation.

The International BIPM/CIPM Key Comparison Reference Value for Natural Gas Flow at High Pressure and Its Metrological Meaning for Natural Gas Trading

2005 ◽  
Author(s):  
D. Dopheide ◽  
B. Mickan ◽  
R. Kramer ◽  
M. P. van der Beek ◽  
G. J. Blom ◽  
...  
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
The Netherlands ◽  
Gas Flow ◽  
Reference Value ◽  
Key Comparisons ◽  
Flow Area ◽  
National Metrology Institutes ◽  
Harmonization Process ◽  
Natural Gas Flow

The paper describes the background of the European Harmonized Reference Value for the cubic meter of Natural Gas at high pressure, which is in use in Germany, The Netherlands and France since May 4th, 2004. The harmonization process began on November 1st, 1999 between Germany and The Netherlands and has been finalized on May 4, 2004 due to the incorporation of the French LNE to the Harmonized Reference Value. The outcome was named: “Harmonized European Natural Gas Cubic Meter” as realized by three independent National Metrology Institutes. The prerequisites of the harmonization process, underlying procedures, results obtained so far and the mutual benefits will be pointed out as well as the economic consequences for the European market as well as for the international user. The paper shows the degree of equivalence between the three participating NMIs PTB, LNE and NMi-VSL. Under auspices of the BIPM (International Bureau for Weight and Measurers) as well as the CIPM (International Conference for Weight and Measures), which is the highest metrological authority worldwide, so called Key Comparisons (KC) have been conducted to get international reference values for all quantities of interest. Among these KCs, the flow area is of economic importance and Key Comparisons for natural gas flow at high pressure and larger flow rates have been conducted successfully. The outcome of such a KC is the international Key Comparisons Reference Value (KCRV), which is then considered to be the worldwide best available realization of Natural Gas Flow at high pressure. These KCs have been conducted among the National Primary Standards of all nations worldwide, represented by their National Metrology Institutes (NMIs) and have been finalized in December 2004 and the KCRV has been approved by the BIPM in April 2005. It turns out at last that the international recommended reference value is exactly the same as the above mentioned European Harmonized Reference Value.

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