On the International Temperature Scale of 1990 (ITS-90). Part I: Some definitions

Mangum, B. W.; Bloembergen, P.; Chattle, M V; Fellmuth, B.; Marcarino, P.; Pokhodun, A. I.

doi:10.1088/0026-1394/34/5/8

Cited by 53 publications

(79 citation statements)

References 3 publications

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“…One of the mathematical ambiguities of the ITS-90 is the Type 3 non-uniqueness of calibrated platinum resistance thermometers: temperature measurements made with several different thermometers agree with one another, by definition, at the ITS-90 defining fixed points, but disagree with one another at temperatures between the defining fixed points [4,5]. Expressions for the uncertainty due to Type 3 non-uniqueness are derived in table 7.2 of reference [24] by fitting the temperature-dependent standard deviation of a set of many thermometers from the comprehensive experimental data of reference [5] in temperature intervals between 24 K and 273.16 K. In the temperature range 83.8058 K to 234.3156 K, the uncertainty due to Type 3 non-uniqueness is estimated as [24] δT non−uniqueness = 2.…”

Section: Csprt Type 3 Non-uniquenessmentioning

confidence: 99%

“…Improving the measurement and understanding of these secondary reference points remains a field of active research: for example, updated measurements have shown that the triple point of xenon, currently listed as a "first quality" secondary reference point [2] is suitable for inclusion as a defining fixed point of the next ITS revision [3] as a means of reducing the severity of the ITS-90 non-uniqueness problem between the triple point of argon and the triple point of water [4,5].…”

Section: Introductionmentioning

confidence: 99%

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The triple point of sulfur hexafluoride

Rourke

2016

Metrologia

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READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.nrc-cnrc.gc.ca/eng/copyright Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions?Contact the NRC Publications Archive team at PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.nrc-cnrc.gc.ca/eng/view/object/?id=94ce3cda-5197-4a6b-9b1b-3d2848210cae http://nparc.nrc-cnrc.gc.ca/fra/voir/objet/?id=94ce3cda-5197-4a6b-9b1b-3d2848210caeThe triple point of sulfur hexafluoride P M C Rourke National Research Council 1200 Montreal Road, Ottawa, ON, K1A 0R6 Canada E-mail: patrick.rourke@nrc-cnrc.gc.ca Abstract. A cryogenic fixed point cell has been filled with high purity (99.999%) sulfur hexafluoride (SF 6 ) and measured in an adiabatic closed-cycle cryostat system. Temperature measurements of the SF 6 melting curve were performed using a capsule-type standard platinum resistance thermometer (CSPRT) calibrated over the International Temperature Scale of 1990 (ITS-90) subrange from the triple point of equilibrium hydrogen to the triple point of water. The measured temperatures were corrected by 0.37 mK for the effects of thermometer self-heating, and the liquidus-point temperature estimated by extrapolation to melted fraction F = 1 of a simple linear regression versus melted fraction F in the range F = 0.53 to 0.84. Based on this measurement, the temperature of the triple point of sulfur hexafluoride is shown to be 223.555 23(49) K (k = 1) on the ITS-90. This value is in excellent agreement with the best prior measurements reported in the literature, but with considerably smaller uncertainty. An analysis of the detailed uncertainty budget of this measurement suggests that if the triple point of sulfur hexafluoride were to be included as a defining fixed point of the next revision of the International Temperature Scale, it could do so with a total realization uncertainty of approximately 0.43 mK, slightly larger than the realization uncertainties of the defining fixed points of the ITS-90. Since the combined standard uncertainty of this SF 6 triple point temperature determination is dominated by chemical impurity effects, further research exploring gas purification techniques and the influence of specific impurity species on the...

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Section: Csprt Type 3 Non-uniquenessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The triple point of sulfur hexafluoride

Rourke

2016

Metrologia

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“…Differences of less than 10 mK have been found between 5N and 6N Ag samples. A detailed analysis with references on the influence of impurities can also be found in [13,19,20].…”

Section: Impuritiesmentioning

confidence: 99%

Uncertainty Budgets for Calibration of Radiation Thermometers below the Silver Point

et al. 2008

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Below the freezing point of silver, radiation thermometers are generally calibrated by implementing the multi-point interpolation method using blackbody measurements at three or more calibration points, rather than the ITS-90 extrapolation technique. The interpolation method eliminates the need to measure the spectral responsivity and provides greater accuracy at the longer wavelengths required below the silver point. This article identifies all the sources of uncertainty associated with the interpolation method, in particular, those related to the reference blackbody temperatures (either variable-temperature or fixed-point blackbodies) and to the measured thermometer signals at these points. Estimates are given of the 'normal' and 'best' uncertainties currently achievable. A model of the thermometer response is used to propagate all the uncertainties at the reference points and provide a total uncertainty at any temperature within the calibration range. The multi-point method has the effect of constraining the total uncertainty over this range, unlike the ITS-90 technique for which the uncertainties propagate as T 2 . This article is a joint effort of the working group on radiation thermometry of the Consultative Committee for Thermometry (CCT), summarizing the knowledge and experience of all experts in this field.

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“…The review protocol provides three-tier algorithms for determining whether no review, an RMO-level review, or a CCT WG8 review is necessary. The cutoff values (U comb ) used in the algorithms were determined from the statistical derivation of 25th and 75th percentile values of the combined CCT K3 and CCT K4 uncertainties and Type I and Type III non-uniqueness values [13]. The Type I and Type III non-uniqueness values were derived from several published and unpublished literature sources.…”

Section: Its-90 Subrange Cmc Review Protocolmentioning

confidence: 99%

CCT WG8 CMC Review Protocols: Development and Implementation

et al. 2008

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The primary objectives of the Consultative Committee on Thermometry Working Group 8 (CCT WG8) are to establish and maintain lists of service categories, to agree on detailed technical review criteria of submitted calibration and measurement capabilities (CMCs), and, where necessary, to develop rules for the preparation of CMC entries. One of the main tasks of CCT WG8 is the creation of harmonized CMC review protocols for thermometry and humidity that are scientifically based. The work of CCT WG8 is performed by the Regional Metrology Organization (RMO) Working Group on Thermometry chairpersons and invited technical experts. The CCT WG8 develops practical, pragmatic guidelines for CMC reviews that let the CMC review process proceed according to a set of objective numerical criteria and specified technical evidence to reduce the possibility of disagreement. The CCT WG8 CMC review protocols are designed so that CMC reviews are scientifically based and not designed to bluntly increase uncertainties. The CMC review protocols currently developed and G. F. Strouse (B) Process Measurements Division (836), National accepted by CCT WG8 cover International Temperature Scale of 1990 (ITS-90) fixed-point cells, ITS-90 calibration temperature subranges for standard platinum resistance thermometers, industrial thermometers, radiation thermometry, and humidity. This article describes the methods used by the CCT WG8 committee to create the review protocols.

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On the International Temperature Scale of 1990 (ITS-90). Part I: Some definitions

Cited by 53 publications

References 3 publications

The triple point of sulfur hexafluoride

The triple point of sulfur hexafluoride

Uncertainty Budgets for Calibration of Radiation Thermometers below the Silver Point

CCT WG8 CMC Review Protocols: Development and Implementation

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