OOIR: Observatory of International Research

Papers

(The TQCC of Metrologia is 2. 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 2021-06-01 to 2025-06-01.)

Article	Citations
Calibration of gauge blocks by optical interferometry comparison - final report	69
SIM Thermocouple Type S Supplementary Comparison	29
Report on EURAMET supplementary comparison on measurement of a 1 mm stage micrometer	26
Adoption of ICRU report 90 recommendations in the Canadian Co-60 air-kerma primary standard	20
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)	18
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	17
Key comparison CCQM-K179 - polar analyte in solid organic material: mass fraction of oxytetracycline hydrochloride salt	17
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
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	16
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with EMPA, June 2023	16
Final report on the EURAMET key comparison EURAMET AUV.V-K5	14
Absolute frequency measurement of a Lu⁺ (³D₁) optical frequency standard via link to international atomic time	14
Comparison between four integer ambiguity resolved PPP GNSS time transfer software solutions	14
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
Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the BFKH, Hungary, and the BIPM in low-energy x-rays	13
Final report of CCQM-K96.2023: assay of potassium dichromate	13
CIPM key comparison of viscosity CCM.V-K4	13
Relating SI units to the ‘defining constants’	13
Acoustic measurement of the triple point of neon T _Ne and thermodynamic calibration of a transfer standard for accurate cryogenic thermometry	13
Characterization of the LED filament lamp for luminous intensity calibration	12
Bilateral comparison of 1 Ω and 10 kΩ standards (ongoing BIPM key comparison BIPM.EM-K13) between the NPLI (India) and the BIPM	12
Report on comparison EURAMET.M.M-S10 (comparison of sub-multiples of the kilogram)	12
Final report of APMP.AUV.V-S1: supplementary comparison on calibration of laser tachometers using mechanical generators	12
CCQM-K68.2019, nitrous oxide (N₂O) in air, ambient level, final report	11

Update of the BIPM comparison BIPM.RI(II)-K1.Sn-113 of activity measurements of the radionuclide ¹¹³Sn to include the 2017 result of the LNE-LNHB (France)	11
Bilateral Comparison of 1.018 V and 10 V Standards between the SMD (Belgium) and the BIPM, October to December 2021 (part of the ongoing BIPM key comparison BIPM.EM-K11)	11
Detection and identification of faults in clock ensembles with the generalized likelihood ratio test	11
APMP key comparison of AC-DC current transfer standards: final report	11
Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the BFKH, Hungary, and the BIPM in mammography x-rays	10
Comparison in dynamic primary calibration of digital-output accelerometer between CEM and PTB	10
Autocollimators: plane angle measurand ambiguities and the impact of surface form	10
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the GUM, Poland and the BIPM in ¹³⁷Cs gamma radiation	10
Discussion on the calculation of the uncertainties of [UTC-UTC(k)]	10
High precision roundness measurement by error separation techniques (EURAMET.L-S30)	10
Comparison of low air speed facilities	10
Corrigendum: Uncertainty of the measurement of the frequency dependence of four-terminal pair capacitance with a four-channel vector network analyzer (2025 Metrologia 62 025011)	10
Series connection of quantum Hall resistance array and programmable Josephson voltage standard for current generation at one microampere	9
Comparison of blackbody for clinical infrared ear thermometers	9
Determining the calibration factor of Rn-220 by low-pressure scintillation cell	9
Extrapolation schemes of key comparison results in gas analysis	9
ITS-90 reproducibility, xenon fixed point substitution and new interpolating equations between 13.8033 K and 273.16 K	9
Report on the APMP key comparison of hydrometer calibrations APMP.M.D-K4	9
Economic optimization of acceptance interval in conformity assessment: 1. Process with no systematic effect	9
EURAMET.M.FF-S13 final report	9
The irony of the magnet system for Kibble balances—a review	8
Machine learning based priors for Bayesian inversion in MR imaging	8
CCM.G-K2.2023: CIPM key comparison of absolute gravimeters	8
NTSC SrII optical lattice clock with uncertainty of 2x10^-18	8
Achievement of 0.005% combined transfer uncertainties in the NIST detector calibration facility	7
High polarity analyte(s) in aqueous media: Determination of L-PFOA and L-PFOS in ground water	7
Final report on the supplementary comparison EURAMET.AUV.V-S2	7
Traceable characterisation of fibre-coupled single-photon detectors	7
The forgotten (?) potentiometric method in thermometry	7
Key comparison CCQM-K148.b - polar analyte in solid organic material: mass fraction of oxytetracycline	7
Phase shifting angle interferometer	7
The unusual status of the hectare in the SI	7
Final report on key comparison APMP.M.P-K7.2 in hydraulic gauge pressure from 10 MPa to 100 MPa	7
Gas viscosities from a semiconductor-manufacturing mass-flow controller	6
Dual-mode room temperature self-calibrating photodiodes approaching cryogenic radiometer uncertainty	6
Ambient humidity, the overlooked influencer of radioactivity measurements	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
Final report for CCQM-P212: coherence of carbon isotope delta reference materials	6
Evaluation of the transportable atom gravimeter HUST-QG	6
Accurate characterisation of optical diffuse transmission—primary facility and extension to translucent samples	6
Report on APMP key comparison: calibration of line scale (APMP.L-K7)	6
A proposal for three categories of units within the SI	6
Measurement model of circadian action factor of phosphor-converted white LEDs based on photometric, electrical, and thermal properties	6
A new interpolation equation in the ITS-90 subrange from the triple point of water to the freezing point of indium	6
Room temperature dual-mode internal quantum deficiency measurement with propagated uncertainty to 0.03% (k = 2)	6
Key comparison CCEM.RF-K27.W of RF power from 50 GHz to 75 GHz in rectangular waveguide	5
Bilateral comparison in torque transducer calibration between CENAM, Mexico and CEM, Spain, SIM.M.T-S1	5
Calibration of GNSS stations for UTC	5
Multi-taper-based automatic correction of non-anechoic antenna measurements	5
AFRIMETS.AUV.A-S2 final report, calibration of a multi-function acoustic calibrator	5

International comparison CCQM-K165: dimethyl sulfide in nitrogen at 5 nmol mol^-1	5
Key comparison COOMET.QM-K120 "Carbon dioxide in air at urban level (480–800) μmol/mol"	5
Primary thermometry at 4 K, 14 K, and 25 K applying dielectric-constant gas thermometry	5
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)	5
Final report on the CCM key comparison of kilogram realizations CCM.M-K8.2021	5
Gonioreflectometer for measuring 3D spectral BRDF of horizontally aligned samples with traceability to SI	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
Pilot study CCQM-P172 – spectroscopic methods for HNO₃ value assignment	5
Accurate density measurement of a small solid sample using a combination of hydrostatic weighing and pressure-of-flotation methods	5
Linkage for Metrosert to CCT-K9 via the EURAMET-T.K9.1 bilateral comparison	5
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with NIST, July 2022	5
Precise high resistance comparison between the NMIJ traveling dual source bridge and the NIST adapted Wheatstone bridge	5
Power of a test for assessing interlaboratory consensus of nominal and ordinal characteristics of a substance, material, or object	5
Measurement science meets the reproducibility challenge	5
A proposal to change the leap-second adjustments to coordinated universal time	5
Erratum: Metrological characterization of a commercial single-photon source with high photon flux emission (2024 Metrologia 61 054001)	5
Precision measurement of an electron pump at 2 GHz; the frontier of small DC current metrology	4
Continuous IPPP links for UTC	4
Final report, On-going Key Comparison BIPM.QM-K1, Ozone at ambient level, comparison with NIM Oct.2023	4
APMP key comparison of luminous intensity (APMP.PR-K3.a): final report	4
A Bayesian statistical method for large-scale MEMS-based sensors calibration: a case study on 100 digital accelerometers	4
CCQM-P206, nitrous oxide (N₂O) in air, ambient level, pilot study run in parallel with CCQM-K68.2019	4
Comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the NRC, Canada and the BIPM in accelerator photon beams	4
First evaluation of the primary frequency standard NTSC-CsF2	4
Activity measurements of the radionuclides ^99mTc, ¹⁸F and ⁶⁴Cu for the POLATOM, Poland, in the ongoing comparisons BIPM.RI(II)-K4 series and KCRV update in the corres	4
Continuous GPS PPP-AR frequency transfer links	4
Corrigendum: Refractive index gas thermometry between 13.8 K and 161.4 K (2021 Metrologia 58 025008)	4
Primary standard for traceability in low liquid hydrocarbon fuel flow rates	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
Assay of sodium carbonate	4
Facility for calibrating anemometers as a function of air velocity vector and turbulence	4
The new mise en pratique for the metre—a review of approaches for the practical realization of traceable length metrology from 10⁻¹¹ m to 10¹³ m	4
Key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of deoxynivalenol (DON) in acetonitrile (ACN)	4
Precision Control of Resistive Power in Kibble Balance Coils: An Advanced Method for Minimizing Temperature-Related Magnetic Errors	4
Final report on EURAMET key comparison EURAMET.M.D-K2.2 (1523)	4
International comparison CCQM-K3.2019 automotive exhaust gases	4
Supplementary comparison for the traceability of AC high voltage reference measuring systems up to 200 kV (EURAMET.EM-S33)	4
Bilateral supplementary comparison of high voltage transformer measuring systems	3
Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the GUM, Poland, and the BIPM in low-energy x-rays	3
Bilateral key comparison EURAMET.EM-K11.1 "AC-DC Voltage Transfer Difference at Low Voltages"	3
Bilateral comparison of irradiance scales between PMOD/WRC and PTB for longwave downward radiation measurements	3
Automatic alignment technique for the suspended coil in the joule balance	3
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with INRIM, February 2022	3
Comment on ‘On the dimension of angles and their units’	3
Final report "Key comparison CCM.FF-K1.2015 - water flow: 30 m³/h ... 200 m³/h"	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
Report on the key comparison, CCM.F-K23 in force at 200 N and 500 N	3
Analysis of reproducibility by using inclusive and exclusive statistics in the framework of a bilateral comparison	3
Advancements in the NRC-FCs2 primary frequency standard	3
New impedance bridge at LNE for the two terminal-pair AC resistor calibration up to 20 kHz	3
Calibration of an ionisation chamber for parent–progeny decay	3
Final report of CCQM-P204, comparison on CO₂ isotope ratios in pure CO₂	3
Comparison report between NIM and CMS of the ITS-90 realization at the triple point of argon	3
A constant pressure flowmeter for extreme-high vacuum	3
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the BEV, Austria and the BIPM in ¹³⁷Cs gamma radiation	3
Observation of systematic deviations between Faraday cup aerosol electrometers for varying particle sizes and flow rates—results of the AEROMET FCAE workshop	3
Comparison of methods to determine the fluence of monoenergetic neutrons in the energy range from 30 keV to 14.8 MeV	3
Developing calibration and measurement capabilities for atmospheric CH₄ stable isotope ratios at NMIs/DIs: metrology for global comparability	3
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the KRISS, Republic of Korea and the BIPM in ⁶⁰Co gamma radiation	3
Phase-stepping interferometry for parallelism measurement of step gauge faces	3
Final report on the APMP regional comparison of type R thermocouples calibration at Cu, Co-C and Pd fixed points, APMP.T-S16	3
Report on the AFRIMETS.M. F-S1 supplementary force comparison for 10 kN and 100 kN	3
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)	3
Primary calibration system for digital accelerometers	3
Practical realisation of the kelvin by Johnson noise thermometry	3
AFRIMETS supplementary comparison on pin gauges	3
Key comparison study on peptide purity - glycated hexapeptide of HbA1c	3
Remote time and frequency calibration with holdover traceability from a new treatment of non-white noise in rubidium clocks	3
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the NIM and the BIPM	3
CIPM key comparison CCPR-K1.a.2017 for spectral irradiance 250 nm to 2500 nm. Final report	3
Measurement of average mass attenuation coefficient of air for ¹³⁷Cs gamma-ray irradiation beam	3
Method to traceably determine the refractive index by measuring the angle of minimum deviation	3
Long-term stability of molecular doped epigraphene quantum Hall standards: single elements and large arrays (R _K/236 ≈ 109 Ω)	3
Final report of CCQM-K157 for the measurement of the amount of substance of HfO₂ expressed as the thickness of nm films	3
Mass fraction assignment of Bisphenol-A high purity material	3
An assessment of the ageing of the absolute spectral responsivity of trap detectors at krypton ion laser emission wavelengths	3
A two-capillary viscometer for temperatures up to 473 K and pressures up to 100 MPa—operation and verification at low pressure	3
Final report of CCQM-K96.2023.1: assay of potassium dichromate	3
Traceable spectral interferometry for length measurement	2
Update of the BIPM comparison BIPM.RI(II)-K1.Tl-201 of activity measurements of the radionuclide ²⁰¹Tl to include the 2011 result of the NIST (United States)	2

A bilateral comparison of NIST and PTB laser power standards for scale realization confidence by gravitational wave observatories	2
Reply to Comment on ‘On the dimension of angles and their units’	2
Measurement of bidirectional transmittance distribution function in the visible and near-infrared spectral range	2
APMP.QM-S19: Toxic elements in seafood	2
International comparison CCQM-P229 pilot study to measure line intensities of selected ¹²C¹⁶O transitions	2
GPS PPP-AR frequency transfer and its application for comparing atomic fountain primary frequency standards between NRC and PTB	2
Report of subsequent key comparison CCQM - K73.2018.2 amount content of H+ in hydrochloric acid (0.1 mol/kg-1)	2
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
Calibration of the microphone sensitivity below 0.5 Hz using the liquid-column-type sound pressure generator	2
Supplementary comparison CCRI(I)-S3 of standards for absorbed dose to water in ⁶⁰Co gamma radiation at radiation processing dose levels	2
Final report on GULFMET supplementary comparison of high current transformer measuring systems (GULFMET.EM-S7)	2
Primary calibration for airborne infrasound utilizing the vertical gradient of the ambient pressure	2
Extension to the range of prefixes for binary multiples	2
Speedy in-situ magnetic field compensation algorithm for multiple-channel single-beam SERF atomic magnetometers	2
On modelling of artefact instability in interlaboratory comparisons	2
EURAMET.T-K9 regional key comparison ITS-90 SPRT calibration from the Ar TP to the Zn FP	2
Characterization of laser-pumped Cs-⁴He atomic magnetometer	2
A test of measurement results with increased sensitivity to inconsistency	2
APMP supplementary international comparison of activity measurement of Cs-134 and Cs-137 in brown rice	2
Calibration of angle standards	2
AFRIMETS supplementary comparison on calibration of dial gauge	2
Final report on CCQM-K167: carbon isotope delta measurements of vanillin	2
Comparison of standards for the calibration of stopwatches	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
Elements in lipstick material	2
PAWG pilot study on quantification of total haemoglobin in blood	2
Evaluation of the relativistic redshift in frequency standards at KRISS	2
Repeatability of a primary thermometer and calibration of resistance thermometers between 5 K and 25 K	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
A three-cornered hat analysis of instabilities in two-way and GPS carrier phase time transfer systems	2
Subsequent bilateral key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of aflatoxin B1 (AfB1) in acetonitrile (ACN)	2
EURAMET supplementary comparison EURAMET.L-S26.1, measurement of groove depth standards in the range 5 μm up to 0.9 mm	2
Thermodynamic effects in a gas modulated Invar-based dual Fabry–Pérot cavity refractometer	2
Final report, on-going key comparison BIPM.QM-K1, ozone at ambient level, comparison with NIMT, September 2022	2
Update of the BIPM comparison BIPM.RI(II)-K1.Ba-133 of activity measurements of the radionuclide ¹³³Ba to include the 2016 result of the NRC (Canada), the 2018 result of the TENMAK-NÜKEN (T	2
Supplementary comparison of the measurement of the alpha and beta particle surface emission rates from large area sources (CCRI(II)-S10 LASCE)	2
High polarity analyte(s) in aqueous media: determination of L-PFOA and L-PFOS in ground water	2
Speed of sound measurements and derived third and fourth acoustic virial coefficients of supercritical neon	2
Phase transition behavior of pure Fe cells for thermocouple calibration	2
Characterization of the collisional frequency shift in an atomic fountain clock using absorption imaging	2
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with CMS/ITRI, March 2024	2
ITS-90 SPRT calibration from the Ar TP to the Zn FP	2
Temperature dependence correction method of LED filament lamp for total luminous flux calibration based on voltage measurement	2
CCQM-K176 breast cancer biomarker HER2 copy number variation (CNV) measurement	2
Noise-induced servo errors in optical clocks utilizing Rabi interrogation	2
CCQM-K158 elements and inorganic arsenic in rice flour	2
Absolute frequency measurement of the ⁸⁷Sr optical lattice clock at NTSC using international atomic time	2
SIM.T-K9.3: Standard platinum resistance thermometer ITS-90 realizations from the Hg triple point to the Zn freezing point	2
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)	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
Iodine frequency-stabilized HeNe laser amplified by injection locking of a semiconductor laser diode	2