Metrology

metrologicalmetrologistlegal metrologymeasurementmeasurement standards laboratorymeasuredMetrological physicsmetrological traceabilityanalysisGauging/Metrology
Metrology is the science of measurement.wikipedia
408 Related Articles

Metre Convention

Convention of the MetreTreaty of the Metre[61]
Several other countries adopted the metric system between 1795 and 1875; to ensure conformity between the countries, the Bureau International des Poids et Mesures (BIPM) was established by the Metre Convention.
The treaty created the International Bureau of Weights and Measures (BIPM), an intergovernmental organization under the authority of the General Conference on Weights and Measures (CGPM) and the supervision of the International Committee for Weights and Measures (CIPM), that coordinates international metrology and the development of the metric system.

Unit of measurement

unitunits of measurementunits
The sub-fields are scientific or fundamental metrology, which is concerned with the establishment of units of measurement, Applied, technical or industrial metrology, the application of measurement to manufacturing and other processes in society, and Legal metrology, which covers the regulation and statutory requirements for measuring instruments and the methods of measurement.
Metrology is the science of developing nationally and internationally accepted units of measurement.

General Conference on Weights and Measures

CGPMCGPM conferenceCGPM (General Conference on Weights and Measures)
This has evolved into the International System of Units (SI) as a result of a resolution at the 11th Conference Generale des Poids et Mesures (CGPM) in 1960.
Comité international des poids et mesures (CIPM), consisting of selected scientists and metrologists, which prepares and executes the decisions of the CGPM and is responsible for the supervision of the International Bureau of Weights and Measures;

Kibble balance

Kibble (or watt) balance
Scientific metrology, through the development of the Kibble balance and the Avogadro project, has produced a value of Planck constant with low enough uncertainty to allow for a redefinition of the kilogram.
It is a metrological instrument that can realize the new definition of the kilogram unit of mass based on fundamental constants, termed an electronic or electrical kilogram.

WELMEC

WELMEC was established in 1990 to promote cooperation in the field of legal metrology in the European Union and among European Free Trade Association (EFTA) member states.
WELMEC is a body set up to promote European cooperation in the field of legal metrology.

National Institute of Standards and Technology

NISTNational Bureau of StandardsBureau of Standards
In the United States legal metrology is under the authority of the Office of Weights and Measures of National Institute of Standards and Technology (NIST), enforced by the individual states. Some examples of NMI's are the National Institute of Standards and Technology (NIST) in the United States, the National Research Council (NRC) in Canada, the Korea Research Institute of Standards and Science (KRISS), and the National Physical Laboratory of India (NPL-India).
The Bureau took custody of the copies of the kilogram and meter bars that were the standards for US measures, and set up a program to provide metrology services for United States scientific and commercial users.

Kilogram

kgmgmilligram
Scientific metrology, through the development of the Kibble balance and the Avogadro project, has produced a value of Planck constant with low enough uncertainty to allow for a redefinition of the kilogram. With the redefinition of the SI units occurring on May 20th, 2019 the kilogram, ampere, kelvin, and mole will then be defined by setting exact numerical values for the Planck constant (''
Copies of the IPK kept by national metrology laboratories around the world were compared with the IPK in 1889, 1948, and 1989 to provide traceability of measurements of mass anywhere in the world back to the IPK.

Kelvin

KkelvinsmK
With the redefinition of the SI units occurring on May 20th, 2019 the kilogram, ampere, kelvin, and mole will then be defined by setting exact numerical values for the Planck constant (''
For legal metrology purposes, the new definition will officially come into force 20 May 2019 (the 130th anniversary of the Metre Convention).

Calibration

calibratedcalibratecalibrating
Traceability is most often obtained by calibration, establishing the relationship between an indication on a measuring instrument (or secondary standard) and the value of the standard.
Calibration in measurement technology and metrology is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy.

Standard (metrology)

standardstandardscalibration standard
A standard (or etalon) is an object, system, or experiment with a defined relationship to a unit of measurement of a physical quantity.
In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity.

Measurement uncertainty

uncertaintyerroruncertainties
Measurement uncertainty is a value associated with a measurement which expresses the spread of possible values associated with the measurand—a quantitative expression of the doubt existing in the measurement.
In metrology, measurement uncertainty is the expression of the statistical dispersion of the values attributed to a measured quantity.

International Organization of Legal Metrology

OIMLInternational Organization of Legal Metrology (OIML)Convention establishing an International Organization of Legal Metrology
The International Organization for Legal Metrology (OIML) was established to assist in harmonising regulations across national boundaries to ensure that legal requirements do not inhibit trade.
The International Organization of Legal Metrology (Organisation Internationale de Métrologie Légale - OIML), is an intergovernmental organization, created in 1955 and based in Paris, to promote the global harmonization of the legal metrology procedures that underpin and facilitate international trade.

Measurement

measuremeasuringmeasured
Measurement uncertainty is a value associated with a measurement which expresses the spread of possible values associated with the measurand—a quantitative expression of the doubt existing in the measurement. Metrology is the science of measurement.
The science of measurement is pursued in the field of metrology.

SI base unit

base unitbase unitsbase
There is a proposed redefinition of the SI base units that was formally voted on in November 2018, and will come into effect in May 2019.
It has long been an objective in metrology to define the kilogram in terms of a fundamental constant, in the same way that the metre is now defined in terms of the speed of light.

International System of Units

SISI unitsSI unit
This has evolved into the International System of Units (SI) as a result of a resolution at the 11th Conference Generale des Poids et Mesures (CGPM) in 1960.
A French-inspired initiative for international cooperation in metrology led to the signing in 1875 of the Metre Convention, also called Treaty of the Metre, by 17 nations.

Metric system

metricmetric unitsmetric unit
This led to the creation of the decimal-based metric system in 1795, establishing a set of standards for other types of measurements.
Metrology

National Physical Laboratory of India

National Physical LaboratoryNational Physical Laboratory (NPL)National Physical Laboratory, New Delhi
Some examples of NMI's are the National Institute of Standards and Technology (NIST) in the United States, the National Research Council (NRC) in Canada, the Korea Research Institute of Standards and Science (KRISS), and the National Physical Laboratory of India (NPL-India).
The National Physical Laboratory of India, situated in New Delhi, is the measurement standards laboratory of India.

Korea Research Institute of Standards and Science

Some examples of NMI's are the National Institute of Standards and Technology (NIST) in the United States, the National Research Council (NRC) in Canada, the Korea Research Institute of Standards and Science (KRISS), and the National Physical Laboratory of India (NPL-India).
The Korea Research Institute of Standards and Science (KRISS) is the national measurement standards laboratory for the Republic of Korea.

Measuring instrument

instrumentscientific instrumentinstruments
Although the emphasis in this area of metrology is on the measurements themselves, traceability of the measuring-device calibration is necessary to ensure confidence in the measurement.
Metrology

Forensic metrology

Forensic metrology
Forensic metrology is metrology, the science of measurement, as it applies to forensic sciences.

Ohm

Ωohms
Three possible methods of realisation are defined by the [[Joint Committee for Guides in Metrology#VIM: International vocabulary of metrology|international vocabulary of metrology]] (VIM): a physical realisation of the unit from its definition, a highly-reproducible measurement as a reproduction of the definition (such as the quantum Hall effect for the ohm), and the use of a material object as the measurement standard.
Not all users of units had the resources to carry out metrology experiments to the required precision, so working standards notionally based on the physical definition were required.

Dimensional metrology

industrial metrology
Dimensional metrology
Early Mesopotamian and Egyptian metrologists created a set of measurement standards based on body measures such as fingers, palms, hands, feet, Cubits, and paces and agricultural measures such as feet, yards, paces, fathoms, rods, cords, perch, stadia, miles and degrees of the Earth's circumference.

Metrologia

Metrologia (academic journal)
Metrologia is an international journal dealing with the scientific aspects of metrology.

NCSL International

NCSL International
NCSL International (NCSLI) (from the founding name "National Conference of Standards Laboratories") is a global, non-profit organization whose membership is open to any organization with an interest in metrology (the science of measurement) and its application in research, development, education, and commerce.

Sèvres

SevresSèvres, France
The CIPM meets annually in Sèvres to discuss reports from the CCs, to submit an annual report to the governments of member states concerning the administration and finances of the BIPM and to advise the CGPM on technical matters as needed.
* The Bureau International des Poids et Mesures (International Bureau of Weights and Measures), located in the Pavillon de Breteuil in Sèvres, keeps the measurement standards of the International System of Units (SI): the standard kilogram, atomic clocks, and other metrological devices.