Metrologia

Article	Citations
Optical frequency ratio of a 171Yb+ single-ion clock and a 87Sr lattice clock	31
Demonstration of the nearly continuous operation of an171Yb optical lattice clock for half a year	29
Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year	24
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	23
Beginning of a new phase of the dissemination of the kilogram	20
A 87Sr optical lattice clock with 2.9 × 10  −17 uncertainty and its absolute frequency measurement	20
Roadmap towards the redefinition of the second	19
Review of field characterization techniques for high intensity therapeutic ultrasound	19
Absolute frequency of 87Sr at 1.8 × 10−16 uncertainty by reference to remote primary frequency standards	19
Reduction of calibration uncertainty due to mounting of three-axis accelerometers using the intrinsic properties model	17
High-performance coherent population trapping atomic clock with direct-modulation distributed Bragg reflector laser	16
Refractive index gas thermometry between 13.8 K and 161.4 K	15
Thermodynamic effects in a gas modulated Invar-based dual Fabry–Pérot cavity refractometer	14
Measurement configurations for differential sampling of AC waveforms based on a programmable Josephson voltage standard: effects of sampler bandwidth on the measurements	14
Empirical decomposition and error propagation of medium-term instabilities in half-life determinations	13
The international reference system for pure beta-particle emitting radionuclides: an evaluation of the measurement uncertainties	13
First uncertainty evaluation of the cesium fountain primary frequency standard NMIJ-F2	13
Guidance on Bayesian uncertainty evaluation for a class of GUM measurement models	12
Absolute energies and emission line shapes of the L x-ray transitions of lanthanide metals	12
Primary calibration system for digital accelerometers	11
Continuous IPPP links for UTC	11
Ytterbium optical lattice clock with instability of order 10−18	11
Establishing waveguide lines as primary standards for scattering parameter measurements at submillimetre wavelengths	11
Preliminary study of generating a local time scale with NIM 87Sr optical lattice clock	10
Refining the cold atom pressure standard	10

An AC quantum voltmeter for frequencies up to 100 kHz using sub-sampling	10
Improved frequency ratio measurement with 87Sr and 171Yb optical lattice clocks at NMIJ	10
Final report on the CCM key comparison of kilogram realizations CCM.M-K8.2021	10
A critical review of the common thermocouple reference functions	10
Towards a consensus on a continuous coordinated universal time	9
The irony of the magnet system for Kibble balances—a review	9
Prenormative verification and validation of a protocol for measuring magnetite–maghemite ratios in magnetic nanoparticles	9
CCQM-K68.2019, nitrous oxide (N2O) in air, ambient level, final report	9
Transient heating in fixed length optical cavities for use as temperature and pressure standards	9
On the influence of inlet perturbations on slug dynamics in horizontal multiphase flow—a computational study	9
Precise density measurement and its uncertainty evaluation for refractory liquid metals over 3000 K using electrostatic levitation	9
Precision measurement of an electron pump at 2 GHz; the frontier of small DC current metrology	8
A three-cornered hat analysis of instabilities in two-way and GPS carrier phase time transfer systems	8
Measurement of the 27Al+ and 87Sr absolute optical frequencies	8
Highly-accurate second-virial-coefficient values for helium from 3.7 K to 273 K determined by dielectric-constant gas thermometry	8
Thickness and refractive index measurements of a thin-film using an artificial neural network algorithm	8
A fully digital bridge towards the realization of the farad from the quantum Hall effect	8
Robustness tests for an optical time scale	8
Determination of the responsivity of a predictable quantum efficient detector over a wide spectral range based on a 3D model of charge carrier recombination losses	8
Towards traceable dynamic pressure calibration using a shock tube with an optical probe for accurate phase determination	8
Achieving traceability to UTC through GNSS measurements	8
A new calibration setup for lock-in amplifiers in the low frequency range and its validation in a bilateral comparison	8
Precise sinusoidal signal extraction from noisy waveform in vibration calibration	8
Quantification of titanium dioxide (TiO2) anatase and rutile polymorphs in binary mixtures by Raman spectroscopy: an interlaboratory comparison	8
Acoustic measurement of the triple point of neon T Ne and thermodynamic calibration of a transfer standard for accurate cryogenic thermometry	8
Thickness measurements and uncertainty evaluation of a multilayer thin-film sample using auxiliary single-layer samples	7
The comparability of the determination of the molar mass of silicon highly enriched in 28Si: results of the CCQM-P160 interlaboratory comparison and additional external measurements	7
Two-point diameter calibration of a sphere using a micro-coordinate measuring machine at NMIJ	7
Gonioreflectometer for measuring 3D spectral BRDF of horizontally aligned samples with traceability to SI	7
Survey of subrange inconsistency of long-stem standard platinum resistance thermometers	7
Evaluation of the transportable atom gravimeter HUST-QG	7
A laser pistonphone designed for absolute calibration of infrasound sensors from 10 mHz up to 20 Hz	7
Role of measurement uncertainty in the comparison of average areal rainfall methods	7
Calibration of GNSS stations for UTC	7
Absolute frequency measurement of the 87Sr optical lattice clock at NTSC using international atomic time	7
First realisation of the kilogram with the METAS Kibble balance	7
A metrological approach to quantities that are counted and the unit one	7
Realization and evaluation of the triple point of sulfur hexafluoride	7
Uncertainty evaluations from small datasets	7
PTB–INRIM comparison of novel digital impedance bridges with graphene impedance quantum standards	6
Evaluation of blackbody radiation shift with 2 × 10−18 uncertainty at room temperature for a transportable 40Ca+ optical clock	6
Measurements of absolute, SI-traceable lunar irradiance with the airborne lunar spectral irradiance (air-LUSI) instrument	6
Rejection sampling for Bayesian uncertainty evaluation using the Monte Carlo techniques of GUM-S1	6
Metrological approach of γ-emitting radionuclides identification at low statistics: application of sparse spectral unmixing to scintillation detectors	6
Method to traceably determine the refractive index by measuring the angle of minimum deviation	6
SI-traceable solar irradiance measurements for aerosol optical depth retrieval	6
On the uncertainties in the realization of the kelvin based on thermodynamic temperatures of high-temperature fixed-point cells	6
Primary standard for the number concentration of liquid-borne particles: extension of the diameter range from the micrometer to the sub-micrometer level and reduction of the measurement uncertainty	6
Final report on the CIPM key comparison CCAUV.V-K5	6
Revisiting the limits of photon momentum based optical power measurement method, employing the case of multi-reflected laser beam	6

Coherent fiber links operated for years: effect of missing data	6
Proposal for the dimensionally consistent treatment of angle and solid angle by the International System of Units (SI)	6
Finite element analysis of blackbody radiation environment for an ytterbium lattice clock operated at room temperature	5
Differential sampling of AC waveforms based on a programmable Josephson voltage standard using a high-precision sampler	5
Evaluation of effective area of air piston gauge with limitations in piston–cylinder dimension measurements	5
On the dimension of angles and their units	5
A bilateral comparison of NIST and PTB laser power standards for scale realization confidence by gravitational wave observatories	5
Axial force radiometer for primary standard laser power measurements using photon momentum	5
Traceability for nuclear medicine: the status of primary radioactivity standards	5
Defining relative humidity in terms of water activity: III. Relations to dew-point and frost-point temperatures	5
Primary thermometry at 4 K, 14 K, and 25 K applying dielectric-constant gas thermometry	5
Precise measurement of the thickness of silicon wafers by double-sided interferometer and bilateral comparison	5
Corrigendum: Realization of the triple point of carbon dioxide evaluated by the ITS–90 (2020 Metrologia 57 015004)	5
CCQM-K143 comparison of copper calibration solutions prepared by NMIs/DIs	5
Ode to Bayesian methods in metrology	5
ITS-90 reproducibility, xenon fixed point substitution and new interpolating equations between 13.8033 K and 273.16 K	5
Improved absolute frequency measurement of the strontium ion clock using a GPS link to the SI second	5
Final report on CCQM-K167: carbon isotope delta measurements of vanillin	5
Final report of the new BIPM comparison BIPM.RI(II)-K1.Ra-223 of activity measurements of the radionuclide 223Ra including the 2014 result of the NPL (United Kingdom), the 2014 result of th	5
Errors-in-variables calibration with dark uncertainty	5
Uncertainty budget for PTB’s gonioreflectometers and ways to improve it in the short VIS spectral range	5
On the long-term stability of the triple-point-of-water cells	5
A comparison of traceable spatial angle autocollimator calibrations performed by PTB and VTT MIKES	5
International comparison CCQM-K118 natural gas	5
High amplification laser-pressure optic enables ultra-low uncertainty measurements of optical laser power at kilowatt levels	5
Evaluation of different general V(λ) mismatch indices of photometers for LED-based light sources in general lighting applications	5
Detection and identification of faults in clock ensembles with the generalized likelihood ratio test	5
Angles in the SI: a detailed proposal for solving the problem	5
A further short history of the SI prefixes	5
Uncertainty analysis of stack gas flow measurements with an S-type Pitot tube for estimating greenhouse gas emissions using a continuous emission monitoring system	5
Experimental validation of theoretically predicted cut-off of L1–L3M4,5 transitions at Z = 50 through measurements of fluorescence and Coster–Kronig yi	5
Correction factors for primary beta dosimetry	5
A strontium lattice clock with both stability and uncertainty below 5×10−18	5
Final report for supplementary comparison APMP.QM-S15: carbon dioxide in nitrogen at 1000 μmol/mol	4
Type A uncertainty analysis validation of type B analysis for three-axis accelerometer calibrations	4
Verification of an in situ calibrated optomechanical accelerometer for use as a strong ground motion seismic reference	4
The least informative distribution and correlation coefficient of measurement results	4
Final report for supplementary comparison APMP.QM-S9.2017: 100 μmol/mol of carbon monoxide in nitrogen	4
Remote time and frequency calibration with holdover traceability from a new treatment of non-white noise in rubidium clocks	4
The value of stable, comparable and standardised measurement: enabling confidence in decision making for societal challenges	4
Interlaboratory consensus building	4
Speedy in-situ magnetic field compensation algorithm for multiple-channel single-beam SERF atomic magnetometers	4
UME Kibble balance operating in air	4
Improvements of the programmable quantum current generator for better traceability of electrical current measurements	4
Direct comparison of ITS-90 and PLTS-2000 from 0.65 K to 1 K at LNE-CNAM	4
Gas flow standards and their uncertainty	4
Mass fraction assignment of Bisphenol-A high purity material	4
A method for calibrating forward scatter meters indoors	4
The CCRI(II)-K2.Fe-55.2019 key comparison of activity concentration measurements of a 55Fe solution	4
Report of the CCQM-K152. Assay of potassium iodate	4
Ambient humidity, the overlooked influencer of radioactivity measurements	4
International comparison CCQM-K10.2018: BTEX in nitrogen at 5 nmol mol−1	4
Thickness measurement of nm HfO2 films	4
Terahertz frequency counter based on a semiconductor-superlattice harmonic mixer with four-octave measurable bandwidth and 16-digit precision	4
PAWG Pilot Study on Quantification of SARS-CoV-2 Monoclonal Antibody - Part 1	4
ITS-90 SPRT calibration from the Ar TP to the Zn FP	4
International comparison CCQM-K117 ammonia	4
Comment on ‘Angles in the SI: a detailed proposal for solving the problem’	4
Development of a new KRISS low frost-point generator with improved uncertainty from 7 nmol·mol−1 to 1000 nmol·mol−1	3
Long-term spectral responsivity stability of predictable quantum efficient detectors	3
The kilogram: inertial or gravitational mass?	3
International comparison of activity measurements of radon 222 - EURAMET Project n°1475 - EURAMET.RI(II)-S8.Rn-222	3
A high precision VIS/NIR dynamic goniometer-spectrometer	3
International comparison CCQM-K74.2018: Nitrogen dioxide, 10 μmol mol-1	3
Measurement of miscut angles in the determination of Si lattice parameters	3
Development of a primary measurement standard for trace moisture in Ar	3
Precise high resistance comparison between the NMIJ traveling dual source bridge and the NIST adapted Wheatstone bridge	3
Supplementary comparison EURAMET.EM-S42, comparison of lightning impulse (LI) reference measuring systems	3
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	3
International comparison CCQM-K165: dimethyl sulfide in nitrogen at 5 nmol mol-1	3
Reply to Comment on ‘Angles in the SI: a detailed proposal for solving the problem’	3
Simple informative prior distributions for Type A uncertainty evaluation in metrology	3
Increased detector response in optical overfilled measurements due to gas lens formation by nitrogen flow through the entrance aperture	3
Residual resistance ratio as indicator for the influence of impurities on fixed-point temperatures	3
Final report of CCQM-P204, comparison on CO2 isotope ratios in pure CO2	3
Development and implementation of an automated four-terminal-pair Josephson impedance bridge	3
Candidate primary reference measurement procedure for the amount-of-substance content of a complexing agent expressed as EDTA based on the coulometric titration with electrogenerated Hg ions	3
Economic optimization of acceptance interval in conformity assessment: 1. Process with no systematic effect	3
A constant pressure flowmeter for extreme-high vacuum	3
Enhanced dilution step and gravimetric preparation uncertainty for low-amount fraction standard gas mixtures using a newly developed automatic weighing system for a mini cylinder	3

Assay of sodium carbonate	3
Key Comparison Study - Organic Solvent Calibration Solution - Gravimetric preparation and value assignment of aflatoxin B1 (AfB1) in acetonitrile (ACN)	3
Effects of fast x-ray cone-beam tomographic measurement on dimensional metrology	3
Traceable spectral interferometry for length measurement	3
Accurate ground-to-ground laser time transfer by diffuse reflections from tumbling space debris objects	3
Final report of the new BIPM comparison BIPM.RI(II)-K1.Ac-225 of activity measurements of the radionuclide 225Ac to include the 2019 result of the PTB (Germany)	3
A digital framework for realising the SI—a proposal for the metre	3
A virtual flow meter downstream of various elbow configurations	3
Effects of rotation errors on goniometric measurements	3
Mid-infrared spectral responsivity scale based on an absolute cryogenic radiometer and a tunable quantum cascade laser	3
The CIPM list ‘Recommended values of standard frequencies’: 2021 update	3
Some predictions of a validated physical model of Pt–Rh thermocouple drift above 1200 °C	3
Economic optimization of acceptance interval in conformity assessment: 2. Process with unknown systematic effect	3
Scaling of thermoelectric inhomogeneities with temperature in platinum–rhodium alloyed thermocouples	3
Characterization of predictable quantum efficient detector in terms of optical non-linearity in the visible to near-infrared range	3
Evaluation of long-term robustness of the International System of Reference (SIR) used in radionuclide metrology based on the meta-analysis of its machine-readable database	3