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BEGIN:VEVENT
DTSTAMP:20260610T093853Z
DTSTART;VALUE=DATE-TIME:20230118T163000
DTEND;VALUE=DATE-TIME:20230118T173000
SUMMARY:Graham Machin (National Physical Laboratory): The kelvin redefine
 d and its implications
TZID:Europe/London
UID:20230118-8a17841a837f52ba01838e21fdf370ad@warwick.ac.uk
CREATED:20230118T114707Z
DESCRIPTION:The kelvin redefined and its implications Professor Graham Ma
 chin (National Physical Laboratory) In May 2019 the International System
  of Units (the SI) underwent what was its biggest change since its intro
 duction when the definition of four of the seven SI base units were chan
 ged to be based on defined values of fundamental physical constants. Sin
 ce the change\, the kelvin is now defined in terms of the Boltzmann cons
 tant\, the ampere on the electron charge\, the kilogram on the Planck co
 nstant and the mole on the Avogadro constant. The redefinition of the ke
 lvin has opened several new possibilities for traceable thermometry dire
 ct to the kelvin definition. These could include using primary thermomet
 ry to calibrate sensors at National Measurement Institutes (NMIs) and\, 
 in the medium term\, in calibration laboratories dispensing with traceab
 ility to the defined scales (ITS-90\, PLTS-2000) and so disseminating th
 ermodynamic temperature. In the longer term these changes could lead to 
 the rise in potential\, paradigm changing approaches to temperature sens
 ing such as traceability at the point of measurements both through self-
 validating thermometers and more radically by the deployment of practica
 l primary thermometry based on fundamental physics and where temperature
  sensor itself will\, unlike today\, no longer need calibrating to provi
 de traceability. In this talk an introduction to how the kelvin was rede
 fined and to the mise en pratique for the definition of the kelvin (MeP-
 K) will be given. How traceable temperatures are attained will be discus
 sed\, both presently\, through the defined scales and how\, in the mediu
 m and long term\, this is likely to change\; with thermodynamic temperat
 ure approaches becoming increasingly prevalent. The talk will end by int
 roducing novel approaches to temperature traceability including provisio
 n of NMI like uncertainty thermodynamic temperatures in calibration labo
 ratories and the rise of in-situ/in-process traceability and the implica
 tions\, particularly in the context of digitalisation and the need for "
 point-of-truth" in for example autonomous sensor networks.
LOCATION:PLT
CATEGORIES:Departmental Colloquium
LAST-MODIFIED:20230118T114707Z
ORGANIZER;CN=Valery Nakariakov:
END:VEVENT
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