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Nelson Rowell
Phone: 613-993-2377
Fax: 613-952-1394
Email: Nelson.Rowell@nrc-cnrc.gc.ca
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Thermometry
The Thermometry group provides Canadian science and industry with traceability to the SI unit of temperature, the kelvin (K). It does this by implementing primary standards based on the definition of the International Temperature Scale of 1990 (ITS-90), and by offering a calibration service which is linked to the primary standards.
These core activities set the direction of the research programs, which include the realization of primary fixed points, studies of the effects that limit the accuracies of the realizations and measurement instrumentation, and improvements in the scale itself.
A cryostat suitable for calibrating capsule platinum resistance thermometers at the triple points of hydrogen, neon, oxygen, and argon in the range 13.8 K to 84 K has been constructed and tested. [More]
Between the fixed points, temperatures on the ITS-90 are obtained by interpolation using standard instruments and assigned formulae. These standard instruments are the helium gas thermometer (3 K to 24.5561 K), the platinum resistance thermometer (13.8033 K to 961.78 °C), and the optical pyrometer (above 961.78 °C). [More]
Related Information
International Temperature Scale of 1990
