OOIR: Observatory of International Research

Papers

(The median citation count of Metrologia is 1. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-05-01 to 2026-05-01.)

Article	Citations
Adoption of ICRU report 90 recommendations in the Canadian Co-60 air-kerma primary standard	125
Key comparison CCQM-K179 - polar analyte in solid organic material: mass fraction of oxytetracycline hydrochloride salt	44
SIM supplementary comparison on calibration of conventional mass of a 20 kg weight	38
Final report of the supplementary comparison between NIMT and LNE on pressure standards in the range 50 MPa to 500 MPa of hydraulic gauge pressure	28
Report on EURAMET supplementary comparison on measurement of a 1 mm stage micrometer	25
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with EMPA, June 2023	24
Report of the CCRI(II) supplementary international comparison of measurement of activity per unit mass of Cs-134 and Cs-137 in wheat flour (CCRI(II)-S13)	23
Final report on the EURAMET key comparison EURAMET AUV.V-K5	21
SIM Thermocouple Type S Supplementary Comparison	21
Comparison of calibration of multimeter	19
Key comparison of voltage unit standards based on the Josephson effect	18
Bilateral Comparison of AC Programmable Josephson Voltage Standard (0.75 V rms and 7 V rms) between the PTB (Germany) and the BIPM, June 2025 (part of the ongoing BIPM key comparison BIPM.EM-K10.c a	18
Reply to Comment on ‘The Avogadro constant is not the defining constant of the mole’	17
Corrigendum: Detection and identification of faults in clock ensembles with the generalized likelihood ratio test (2022 Metrologia 59 045010)	17
Measurement of melting and freezing temperature of iron using radiation thermometry	16
Update of the BIPM comparison BIPM.RI(II)-K1.Ga-67 of activity measurements of the radionuclide ⁶⁷Ga to include the 2023 result of the CMI (Czechia)	16
Absolute frequency measurement of a Lu⁺ (³D₁) optical frequency standard via link to international atomic time	15
Final report of CCQM-K96.2023: assay of potassium dichromate	14
Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the BFKH, Hungary, and the BIPM in low-energy x-rays	14
Low-Frequency Calibration of Accelerometers by Rotation in the Gravitational Field at NIST	14
Final report of APMP.AUV.V-S1: supplementary comparison on calibration of laser tachometers using mechanical generators	14
CORRIGENDUM: Angles in the SI—a practical dimensional metrologist viewpoint ^* (2026 Metrologia 63 013	13
Comparison of low air speed facilities	13
Detection and identification of faults in clock ensembles with the generalized likelihood ratio test	13
Characterization of the LED filament lamp for luminous intensity calibration	13

Final Report on key comparison EURAMET.M.P K4.2020 in the range from 1 Pa to 15 kPa of absolute and gauge pressure	13
CIPM key comparison of viscosity CCM.V-K4	13
CCQM-K68.2019, nitrous oxide (N₂O) in air, ambient level, final report	13
APMP key comparison of AC-DC current transfer standards: final report	13
Comparison between four integer ambiguity resolved PPP GNSS time transfer software solutions	13
Discussion on the calculation of the uncertainties of [UTC-UTC(k)]	12
Relating SI units to the ‘defining constants’	12
Report on the APMP key comparison of hydrometer calibrations APMP.M.D-K4	12
Autocollimators: plane angle measurand ambiguities and the impact of surface form	12
Determining the calibration factor of Rn-220 by low-pressure scintillation cell	12
Economic optimization of acceptance interval in conformity assessment: 1. Process with no systematic effect	11
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the GUM, Poland and the BIPM in ¹³⁷Cs gamma radiation	11
Corrigendum: Uncertainty of the measurement of the frequency dependence of four-terminal pair capacitance with a four-channel vector network analyzer (2025 Metrologia	11
International Comparison CCQM-K10.2018.1 - BTEX gas mixtures	10
Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the BFKH, Hungary, and the BIPM in mammography x-rays	10
Comparison of blackbody for clinical infrared ear thermometers	10
CCM.G-K2.2023: CIPM key comparison of absolute gravimeters	10
High polarity analyte(s) in aqueous media: Determination of L-PFOA and L-PFOS in ground water	9
Evaluations of the decay data of ⁴⁰ K, ⁴⁵ Ti, ⁵⁶	9
NTSC SrII optical lattice clock with uncertainty of 2	9
Series connection of quantum Hall resistance array and programmable Josephson voltage standard for current generation at one microampere	9
Key comparison CCQM-K148.b - polar analyte in solid organic material: mass fraction of oxytetracycline	8
Final report for CCQM-P212: coherence of carbon isotope delta reference materials	8
Gas viscosities from a semiconductor-manufacturing mass-flow controller	8
The unusual status of the hectare in the SI	8
Machine learning based priors for Bayesian inversion in MR imaging	8
Traceable characterisation of fibre-coupled single-photon detectors	8
Final report on key comparison APMP.M.P-K7.2 in hydraulic gauge pressure from 10 MPa to 100 MPa	8
Reply to Second Comment on ‘The Avogadro constant is not the defining constant of the mole’	8
Phase shifting angle interferometer	8
The forgotten (?) potentiometric method in thermometry	7
Total radiant flux measurement of UV LEDs using a gonio-spectroradiometer	7
Ambient humidity, the overlooked influencer of radioactivity measurements	7
Multi-taper-based automatic correction of non-anechoic antenna measurements	7
Application of a bandwidth correction method to thin-film reflectance measurements	7
Measurement model of circadian action factor of phosphor-converted white LEDs based on photometric, electrical, and thermal properties	7
Accurate characterisation of optical diffuse transmission—primary facility and extension to translucent samples	7
Evaluations of the decay data of ⁵⁷ Co, ⁷⁶ Br, ^133m	7
Applying heat transport modelling to reduce measurement uncertainty of the LASP reference standard NACR8 ^*	7
A proposal for three categories of units within the SI	7
Final report on the CCM key comparison of kilogram realizations CCM.M-K8.2021	7
Key comparison CCEM.RF-K27.W of RF power from 50 GHz to 75 GHz in rectangular waveguide	6
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)	6
Room temperature dual-mode internal quantum deficiency measurement with propagated uncertainty to 0.03% (k = 2)	6
A new interpolation equation in the ITS-90 subrange from the triple point of water to the freezing point of indium	6
Dual-mode room temperature self-calibrating photodiodes approaching cryogenic radiometer uncertainty	6
Evaluation of the transportable atom gravimeter HUST-QG	6
Linkage for Metrosert to CCT-K9 via the EURAMET-T.K9.1 bilateral comparison	6
Bilateral comparison of 10 pF and 100 pF standards (ongoing BIPM key comparisons BIPM.EM-K14.a and 14.b) between the NMIM (Malaysia) and the BIPM	6
Method for traceable calibration of 5G NR measuring receivers	6

Power of a test for assessing interlaboratory consensus of nominal and ordinal characteristics of a substance, material, or object	6
Precision measurement of an electron pump at 2 GHz; the frontier of small DC current metrology	5
Measurement science meets the reproducibility challenge	5
A simple tool for weighted averaging of inconsistent data sets	5
Continuous IPPP links for UTC	5
Precise high resistance comparison between the NMIJ traveling dual source bridge and the NIST adapted Wheatstone bridge	5
Corrigendum: Accuracy evaluation of primary frequency standard NIST-F4 (2025 Metrologia 62 035002)	5
Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the NMIJ, Japan, and the BIPM in ⁶⁰Co gamma radiation	5
Calibration of GNSS stations for UTC	5
Comparison of PLTS-2000 and the magnetic field fluctuation thermometer at LNE-Cnam	5
Accurate density measurement of a small solid sample using a combination of hydrostatic weighing and pressure-of-flotation methods	5
Erratum: Metrological characterization of a commercial single-photon source with high photon flux emission (2024 Metrologia 61 054001)	5
Final report of SIM supplementary comparison on testing machine calibration in compression up to 100 kN.	5
AFRIMETS.AUV.A-S2 final report, calibration of a multi-function acoustic calibrator	5
Key comparison COOMET.QM-K120 "Carbon dioxide in air at urban level (480–800) μmol/mol"	5
Precision control of resistive power in Kibble balance coils: an advanced method for minimizing temperature-related magnetic errors	5
Pilot study CCQM-P172 – spectroscopic methods for HNO₃ value assignment	5
First evaluation of the primary frequency standard NTSC-CsF2	5
Final report, On-going Key Comparison BIPM.QM-K1, Ozone at ambient level, comparison with NIM Oct.2023	5
Continuous GPS PPP-AR frequency transfer links	5
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with NIST, July 2022	5
A constant pressure flowmeter for extreme-high vacuum	4
Spectrophotometer-employed method for measuring luminous transmittance and haze	4
Bilateral comparison of irradiance scales between PMOD/WRC and PTB for longwave downward radiation measurements	4
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the NIM and the BIPM	4
Report of the comparison BIPM.QM-K2.b, on carbon dioxide in nitrogen at ambient levels, with E+ E Elektronik (2025)	4
A proposal to change the leap-second adjustments to coordinated universal time	4
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the BEV, Austria and the BIPM in ¹³⁷Cs gamma radiation	4
Report on the key comparison, CCM.F-K23 in force at 200 N and 500 N	4
Bilateral supplementary comparison of high voltage transformer measuring systems	4
Final report of CCQM-K96.2023.1: assay of potassium dichromate	4
Calibration of a step gauge (APMP.L-K5.n01)	4
Comparison report between NIM and CMS of the ITS-90 realization at the triple point of argon	4
CIPM key comparison CCPR-K1.a.2017 for spectral irradiance 250 nm to 2500 nm. Final report	4
CCQM-P206, nitrous oxide (N₂O) in air, ambient level, pilot study run in parallel with CCQM-K68.2019	4
International comparison CCQM-K3.2019 automotive exhaust gases	4
A Bayesian statistical method for large-scale MEMS-based sensors calibration: a case study on 100 digital accelerometers	4
Final report on EURAMET key comparison EURAMET.M.D-K2.2 (1523)	4
Lunar reference timescale	4
Monte Carlo Uncertainty Evaluation of Gravimetric Gas Mixture with Asymmetric Distributions	4
Assay of sodium carbonate	4
Torque euramet supplementary comparison EURAMET.M.T-S4 (Euramet Project 1304) from 0.1 N·m to 5 N·m and from 5 N·m to 50 N·m	4
A two-capillary viscometer for temperatures up to 473 K and pressures up to 100 MPa—operation and verification at low pressure	4
Practical realisation of the kelvin by Johnson noise thermometry	4
Advancements in the NRC-FCs2 primary frequency standard	4
Key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of deoxynivalenol (DON) in acetonitrile (ACN)	4
Final report on the APMP regional comparison of type R thermocouples calibration at Cu, Co-C and Pd fixed points, APMP.T-S16	4
APMP key comparison of luminous intensity (APMP.PR-K3.a): final report	4
Measurement method of the solar diffuser bidirectional reflectance distribution function in the short-wave infrared band	4
Final report on the CCM key comparison of density measurements of a silicon sphere (1 kg) by hydrostatic weighing (CCM.D-K1.2023)	4
Bilateral comparison of 1.018 V and 10 V standards between CSIR-NPL (India) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	4
Force Key Comparison CCM.F-K2.a.2 - Final Report	4
Key comparisons of air kerma and absorbed dose to water standards in ⁶⁰Co radiation beam (EURAMET.RI(I)-K1.3 and EURAMET.RI(I)-K4.3)	4
Calibration of an ionisation chamber for parent–progeny decay	4
Analysis of reproducibility by using inclusive and exclusive statistics in the framework of a bilateral comparison	3
Final report on key comparison APMP.AUV.A-K5	3
Final report of CCQM-K157 for the measurement of the amount of substance of HfO₂ expressed as the thickness of nm films	3
Subsequent bilateral key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of aflatoxin B1 (AfB1) in acetonitrile (ACN)	3
An assessment of the ageing of the absolute spectral responsivity of trap detectors at krypton ion laser emission wavelengths	3
Measurement of the intrinsic sensitivity for a single-ended accelerometer without the influence of the mounting condition	3
Comparison of methods to determine the fluence of monoenergetic neutrons in the energy range from 30 keV to 14.8 MeV	3
Phase-stepping interferometry for parallelism measurement of step gauge faces	3
GPS PPP-AR frequency transfer and its application for comparing atomic fountain primary frequency standards between NRC and PTB	3
Phase transition behavior of pure Fe cells for thermocouple calibration	3
FINAL REPORT OF SIM SUPPLEMENTARY COMPARISON ON TESTING MACHINE CALIBRATION IN COMPRESSION UP TO 100 kN	3
Speedy in-situ magnetic field compensation algorithm for multiple-channel single-beam SERF atomic magnetometers	3
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with CMS/ITRI, March 2024	3
APMP.QM-S19: Toxic elements in seafood	3
Experimental determination and Monte Carlo validation of ²²⁵ Ac absorbed dose	3
Extension to the range of prefixes for binary multiples	3
New impedance bridge at LNE for the two terminal-pair AC resistor calibration up to 20 kHz	3
Comment on ‘On the dimension of angles and their units’	3
Comparison of standards for the calibration of stopwatches	3
Final report of CCQM-P204, comparison on CO₂ isotope ratios in pure CO₂	3
What is measurement uncertainty? A discussion ^*	3
Long-term stability of molecular doped epigraphene quantum Hall standards: single elements and large arrays (R _K/236 ≈ 109 Ω)	3
APMP supplementary international comparison of activity measurement of Cs-134 and Cs-137 in brown rice	3
A metrological framework for uncertainty evaluation in machine learning classification models	3
Characterization of laser-pumped Cs-⁴He atomic magnetometer	3
Properties of a definition of the SI second based on several optical transitions	3

AFRIMETS supplementary comparison on calibration of dial gauge	3
Activity measurements of the radionuclides ¹⁸F, ⁶⁴Cu and ^99mTc for the ANSTO, Australia, in the ongoing comparisons BIPM.RI(II)-K4 series and KCRV update in the corre	3
Method to traceably determine the refractive index by measuring the angle of minimum deviation	3
International Comparison CCQM-K175 - Hydrogen chloride in nitrogen	3
Comparison of primary standards for liquid flow - flow range (0.1 to 10) µL/min	3
Measurement of average mass attenuation coefficient of air for ¹³⁷Cs gamma-ray irradiation beam	3
Developing calibration and measurement capabilities for atmospheric CH₄ stable isotope ratios at NMIs/DIs: metrology for global comparability	3
AFRIMETS supplementary comparison on pin gauges	3
Reply to Comment on ‘On the dimension of angles and their units’	3
Realisation of the kilogram with the XRCD method – improved XRF evaluation and its impact	3
CCQM-K176 breast cancer biomarker HER2 copy number variation (CNV) measurement	3
Bilateral comparison of 1.018 V and 10 V standards between INRIM (Italy) and the BIPM, November to December 2023 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	3
Bilateral comparison of 1.018 V and 10 V standards between DEFNAT (Tunisia) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	2
Evaluation of the long-term reproducibility of a realization of the kilogram by the XRCD method	2
Bilateral comparison of 10 kΩ standards (ongoing BIPM key comparisons BIPM.EM-K13.b) between UME and the BIPM.	2
Calibration of two mass standards with the LNE Kibble balance in 2024	2
Evaluating the effect of wavefront aberrations in an atom gravimeter^*	2
PAWG pilot study on quantification of total haemoglobin in blood	2
Final report, on-going key comparison BIPM.QM-K1, ozone at ambient level, comparison with NIMT, September 2022	2
On modelling of artefact instability in interlaboratory comparisons	2
Characterization of the collisional frequency shift in an atomic fountain clock using absorption imaging	2
A virtual flow meter downstream of various elbow configurations	2
Update of the BIPM comparison BIPM.RI(II)-K1.Ge-68 of activity measurements of the radionuclide ⁶⁸Ge to include the 2021 result of the NIM (China)	2
Absolute frequency measurement of the ⁸⁷Sr optical lattice clock at NTSC using international atomic time	2
International comparison CCQM-P229 pilot study to measure line intensities of selected ¹²C¹⁶O transitions	2
Calibration of angle standards	2
Repeatability of a primary thermometer and calibration of resistance thermometers between 5 K and 25 K	2
Quantum plasmonic sensing by Hong–Ou–Mandel interferometry	2
Bilateral comparison of 10 pF and 100 pF standards (ongoing BIPM key comparisons BIPM.EM-K14.a and 14.b) between the CENAM (Mexico) and the BIPM	2
Comparison of partial discharge (PD) calibrators from 0.1 pC to 10 nC	2
Measurement of bidirectional transmittance distribution function in the visible and near-infrared spectral range	2
Supplementary comparisons of national standards of ratio error and phase displacement of AC voltage of power frequency COOMET 411/RU-a/07 (COOMET.EM-S6)	2
Regional comparison SIM.QM-S5 - natural gas	2
Calibration of the microphone sensitivity below 0.5 Hz using the liquid-column-type sound pressure generator	2
Report of subsequent key comparison CCQM - K73.2018.2 amount content of H+ in hydrochloric acid (0.1 mol/kg-1)	2
Explicit ensemble mean clock synchronization for optimal atomic time scale generation	2
A three-cornered hat analysis of instabilities in two-way and GPS carrier phase time transfer systems	2
Comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the ARPANSA, Australia, and the BIPM in accelerator photon beams	2
Evaluation of the relativistic redshift in frequency standards at KRISS	2
Enhancing the UTCr algorithm: performance improvements and optimization	2
Letter case pairs for SI prefix symbols	2
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the VSL and the BIPM	2
The isotopic composition of the new enriched silicon crystal Si28-31Pr11: maintaining the realization and dissemination of the mole and the kilogram via the XRCD method	2
Eight-element polarisation independent transmission trap detector with high attenuation	2
COOMET key comparison COOMET.PR-K1.a.2018 for spectral irradiance 250 nm to 2500 nmm, final report	2
Results of the CCRI(II)-S16.Lu-177 International Supplementary Comparison of the Activity Measurements of a Solution of ¹⁷⁷Lu	2
Speed of sound measurements and derived third and fourth acoustic virial coefficients of supercritical neon	2
Uncertainty analysis of MSL’s CCT-K7.2021 key comparison measurements taking account of correlations	2
SIM.T-K9.3: Standard platinum resistance thermometer ITS-90 realizations from the Hg triple point to the Zn freezing point	2
Novel developments of refractive power measurement techniques in the automotive world	2
Primary calibration for airborne infrasound utilizing the vertical gradient of the ambient pressure	2
Second generation room-temperature dual-mode photodiodes with record-low uncertainties	2
EURAMET supplementary comparison EURAMET.L-S26.1, measurement of groove depth standards in the range 5 μm up to 0.9 mm	2
EURAMET.T-K9 regional key comparison ITS-90 SPRT calibration from the Ar TP to the Zn FP	2
CCQM-K158 elements and inorganic arsenic in rice flour	2
A test of measurement results with increased sensitivity to inconsistency	2
Laser-based primary standard for absolute spectral irradiance calibration with predictable quantum efficient detectors	2
ITS-90 SPRT calibration from the Ar TP to the Zn FP	2
Evaluation of different general V(λ) mismatch indices of photometers for LED-based light sources in general lighting applications	2
Update of the BIPM comparison BIPM.RI(II)-K1.Mn-54 of activity measurements of the radionuclide ⁵⁴Mn to include the 2024 result of the POLATOM (Poland)	2
Improved systematic evaluation of a strontium optical clock with uncertainty below	2
NRC measurement set-up and preparatory work for CCT-K7.2021 key comparison of triple-point-of-water cells	2
Impact study of numerical discretization accuracy on parameter reconstructions and model parameter distributions	2
Noise-induced servo errors in optical clocks utilizing Rabi interrogation	2
A robust time scale for space applications using the student’s t-distribution	2
On-site comparison of Quantum Hall Effect resistance standards of the PTB and the BIPM: Ongoing key comparison BIPM.EM-K12	2
Final report on the key comparison CCAUV.A-K6	1
Supplementary comparison of national standard instruments in the field of magnetic flux density and magnetic flux measurements by sensing coils	1
Corrigendum: Corrections to a proposal for three categories of units within the SI (2024 Metrologia 61 033001)	1
Statistics for quantifying aging in time transfer system delays	1
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with UNAL-CALAIRE (November 2023)	1
Instrumentation and uncertainty evaluation for absolute characterization of thin films and nanostructured surfaces in advanced optical metrology	1
Dark uncertainty in key comparisons in the gas analysis area	1
High-fidelity analysis of the electro-optical non-equivalence of planar electrical substitution radiometers^*	1
Update of the BIPM comparison BIPM.RI(II)-K1.Y-88 of activity measurements of the radionuclide ⁸⁸Y to include the 2016 result of the LNE-LNHB (France) and the 2019 result of the BEV (Austri	1
Final report for SIM.QM-S12: supplementary comparison for trace elements in natural water	1
International comparison CCQM-K150: particle number concentration (100 to 20 000 cm^-3) and particle charge concentration (0.15 to 3 fC cm^-3)	1
CCQM-K161 "Anions in Seawater"	1
Small mass value realization equivalent to accuracy class E1 using the Planck-Balance at PTB	1
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with NMC-A*STAR, July 2022	1
Final report of SIM.L-K7.2016	1
On the rationale for recent updates to the SI Brochure concerning angles and quantities with the unit one	1
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the NIST, USA and the BIPM in ⁶⁰Co gamma radiation	1
Bilateral comparison in high gauge pressure 250 MPa	1
Final report of APMP.AUV.V-S2: supplementary comparison on calibration of laser tachometers using mechanical generators or optical simulators	1
Subsequent key comparison of the pH of a borate buffer	1
COOMET regional comparison of the national standards of air kerma for x-radiation qualities used for radiation protection and diagnostic radiology (COOMET.RI(I)-S3)	1
Supplementary comparison of gas provers in the gas flow range 0.25 m³/h to 25 m³/h	1
Bilateral comparison of 1.018 V and 10 V standards between the NSAI (Ireland) and the BIPM, May to June 2024 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	1
Economic optimization of acceptance interval in conformity assessment: 2. Process with unknown systematic effect	1
Thickness and refractive index measurements of a thin-film using an artificial neural network algorithm	1
Conversion of a piston–cylinder dimensional dataset to the effective area of a mechanical pressure generator	1
New beta primary standard (BPS2) and revised ISO 6980 at PTB	1
Final report on EURAMET key comparison EURAMET.M.D-K2.1 (1522)	1
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the NPL and the BIPM	1