– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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BIPM news: BIPM highlights
    Evolving calibration hierarchies for diabetes diagnostics [2017]  
Improved measurements of C-peptide could lead to benefits for people with diabetes according to a report recently published in Clinical Chemistry.
    Happy World Standards Day! [2017]  
Standards make cities smarter Each year on 14 October, the members of the IEC, ISO and ITU celebrate World Standards Day, which is a means of paying tribute to the collaborative efforts of the thousands of experts worldwide who develop the voluntary technical agreements that are published as international standards.
    Agreement with the CEA List gives the BIPM access to the DOSEO platform for high-energy photon beams [2017]  
An agreement between the BIPM and the CEA List will allow the BIPM to operate the ongoing BIPM.RI(I)-K6 comparison for high-energy photon beams at the DOSEO platform for R&D in radiotherapy and imaging technologies.
    Standards to differentiate CO2 emission sources in the atmosphere [2017]  
Standards and methods to calibrate instruments that measure isotope ratios of carbon dioxide in air and operate in the infra-red, have been described in a recent publication in Analytical Chemistry.
    Reference measurement systems for novel biomarkers [2017]  
Methods developed at the BIPM for characterizing primary calibrators for the measurement of hepcidin, a major iron metabolism regulator, have been published in Analytical and Bioanalytical Chemistry.
    Are ozone concentrations in the atmosphere being underestimated? [2016]  
An article just published in Analytical Chemistry by the BIPM reports an independent value of the cross-section of ozone, which provides further evidence to suggest that the currently adopted conventional value of this quantity is too high, meaning that the reported ozone concentrations in the atmosphere are at present being underestimated.
    Time Department launches database and interactive tool for time scale contributors [2016]  
The BIPM Time Department has launched a new database and interactive tool for time scale contributors that is updated monthly with an inventory of laboratories that contribute to UTC and UTCr, their equipment and calibrations.
    Research improves the stability of timescale computation [2016]  
A paper entitled "A new approach to UTC calculation by means of the Kalman filter" has been published in Metrologia following a collaborative research project in the Time Department.
    Improved characterization of the BIPM secondary voltage standards used for bilateral comparisons [2016]  
The BIPM has improved the characterization of its secondary voltage standards used for bilateral comparisons of calibrations of Zener voltage standards (BIPM.EM-K11).
    First BIPM-NMIJ direct comparison of PJVSs at 10 V based on different technologies [2016]  
The BIPM's new transportable programmable Josephson voltage standard (PJVS) was used for the first time for an on-site comparison, at the NMIJ (Japan).
    How pure is your folic acid? BIPM qNMR facility supports organic reference material key comparisons [2016]  
Folic acid is the measurand for an organic purity comparison currently being coordinated by the BIPM. Twenty-two NMIs and expert laboratories are taking part and for the first time the BIPM qNMR facility was used in the development and characterization of the comparison material.
    Standards for monitoring atmospheric carbon dioxide [2016]  
Measurements of the amount fraction of CO2 in air standards, performed with cryogenic trapping, have been achieved at the BIPM. This represents an important milestone towards the establishment of the BIPM CO2-PVT measurement system, which will play a role in the CCQM-K120 key comparison for CO2 in air in 2016.
    New BIPM facility for brachytherapy and x-ray imaging [2016]  
A new facility has been designed and built at the BIPM to support the international comparison series in the field of brachytherapy, a radiotherapy treatment in which calibrated radioactive sources are positioned inside the patient.
    Update on the LISA Pathfinder mission [2016]  
The science mission of the LISA Pathfinder space mission is under way using test masses of a type that had their d.c. volume magnetic susceptibility measured by the BIPM.
    BIPM provided data for the LISA Pathfinder mission [2015]  
The BIPM provided essential magnetic susceptibility data for the proof masses aboard the LISA Pathfinder satellite, launched by ESA on 3 December 2015.
    Graphene-based QHE measurements [2015]  
The use of graphene to greatly simplify the quantum Hall effect (QHE) standard for electrical resistance calibrations is getting closer to reality. Read about the latest measurements at the BIPM.
    First comparisons of 18F activity using the SIR Transfer Instrument [2015]  
These successful comparisons took place in 2014 at the VNIIM, NPL and ENEA-LNMRI and their results were presented at the International Committee for Radionuclide Metrology (ICRM) conference in Vienna in June 2015.
    Presentations and webcast from the BIPM Carbon Workshop [2015]  
The webcast and presentations from the BIPM Workshop on Global to Urban Scale Carbon measurements, held on 30 June to 1 July 2015, are now available.
    Publication of new ozone cross-section measurements for the accurate monitoring of air quality [2015]  
New measurements of the ozone cross section carried out in the BIPM laboratories have been published with a relative standard uncertainty of 0.43 %, the smallest to date. Adoption of these new values would resolve differences between reference methods for surface ozone measurements.
    IPPP: a new technique to improve clock frequency comparisons [2015]  
A joint project between the BIPM, CNES and CLS has developed and tested the IPPP (PPP with integer ambiguity resolution) technique which will lead to a significant improvement in clock frequency comparisons using GPS signals.
    BIPM on-site comparison for radiation therapy dosimetry successfully uses new technology [2014]  
The BIPM carried out a joint comparison with the NPL, UK, and VSL, the Netherlands, in the NPL’s medical accelerator facility from 23 September to 20 October 2014. The BIPM used its transportable graphite calorimeter system to make a direct measurement of absorbed dose to water - a key quantity for traceability in radiation therapy - in three of the high-energy photon beams from 6 MV to 25 MV. The BIPM used a remote-controlled motorized monitoring and shutter system for the first time to reliably track and correct for intrinsic intensity variations in the beams. The new design is compact and demonstrated a high reproducibility in the positioning of the shutter.
    Best overall paper at the 2014 NCSLI Workshop and Symposium [2014]  
Nick Fletcher's paper, ‘Electrical Units in the new SI: Saying Goodbye to the 1990 Values,’ was selected as the best overall paper at the 2014 NCSLI Workshop and Symposium in Orlando, Florida. The extended paper has been published in the journal NCSLI Measure.
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