Indirect determination of the thermodynamic temperature of the copper point by a multi-fixed-point technique

Battuello, M.; Florio, M.; Girard, F.

doi:10.1088/0026-1394/47/3/013

Cited by 7 publications

(17 citation statements)

References 15 publications

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“…Values in Table 2 are obtained assuming T Cu = 1357.840 K, i.e., the value determined by INRIM [11]. Table 3.…”

Section: Measurements and Resultsmentioning

confidence: 99%

“…It is generally accepted that such an approach may be safely used within the extreme end points and that extrapolation beyond these points is not recommended. However, it has been proved that in some circumstances, namely, when a low uncertainty can be associated to the fixed-point realizations and when the temperature difference between the highest calibration point and the extrapolated point is relatively small, the uncertainty in the extrapolated temperature can be kept reasonably low [11,12].…”

Section: Multi-fixed-point Approachmentioning

confidence: 99%

“…The difference of 228 mK was found between the two determinations, namely, a very large difference, well outside of the combined uncertainties of the two experiments. A recent determination at INRIM by a multi-fixed-point approach produced a (T − T 90 ) Cu value of 70 mK with a standard uncertainty of 47 mK [11]. It is worthwhile to remember that the presently available (T − T 90 ) differences at the Au and Cu points, as elaborated by the CCT-WG4, are 39.9 mK and 52.1 mK, respectively.…”

Section: Introductionmentioning

confidence: 96%

“…A summary of the figures discussed above is reported in Fig. 1, where (T − T 90 ) values have been drawn from the last CCT-WG4 document [2] and from [11]. The CCT-WG4, considering the weaknesses discussed above, recommends and encourages new measurements to be undertaken urgently.…”

Section: Introductionmentioning

confidence: 99%

“…Error bars associated to the mean measured values represent uncertainties with k = 1 as reported in [2] thermometers for many years. Recently, the technique has been improved and already used for the indirect determination of the thermodynamic temperature of the copper point [11] and of the transition temperature of the Co-C eutectic fixed point [12]. In the present exercise the technique has been implemented for deriving T Au both by interpolation and extrapolation of a thermodynamic scale.…”

Section: Introductionmentioning

confidence: 99%

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Indirect Determination of the Thermodynamic Temperature of a Gold Fixed-Point Cell

2010

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Since the value T 90 (Au) was fixed on the ITS-90, some determinations of the thermodynamic temperature of the gold point have been performed which form, with other renormalized results of previous measurements by radiation thermometry, the basis for the current best estimates of (T − T 90 ) Au = 39.9 mK as elaborated by the CCT-WG4. Such a value, even if consistent with the behavior of T − T 90 differences at lower temperatures, is quite influenced by the low values of T Au as determined with few radiometric measurements. At INRIM, an independent indirect determination of the thermodynamic temperature of gold was performed by means of a radiation thermometry approach. A fixed-point technique was used to realize approximated thermodynamic scales from the Zn point up to the Cu point. A Si-based standard radiation thermometer working at 900 nm and 950 nm was used. The low uncertainty presently associated to the thermodynamic temperature of fixed points and the accuracy of INRIM realizations, allowed scales with an uncertainty lower than 0.03 K in terms of the thermodynamic temperature to be realized. A fixed-point cell filled with gold, 99.999 % in purity, was measured, and its freezing temperature was determined by both interpolation and extrapolation. An average T Au = 1337.395 K was found with a combined standard uncertainty of 23 mK. Such a value is 25 mK higher than the presently available value as derived by the CCT-WG4 value of (T − T 90 ) Au = 39.9 mK.

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“…Values in Table 2 are obtained assuming T Cu = 1357.840 K, i.e., the value determined by INRIM [11]. Table 3.…”

Section: Measurements and Resultsmentioning

confidence: 99%

Section: Multi-fixed-point Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Indirect Determination of the Thermodynamic Temperature of a Gold Fixed-Point Cell

2010

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Co–C and Pd–C Fixed Points for the Evaluation of Facilities and Scales Realization at INRIM and NMC

et al. 2014

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Influence of the Cavity Length on the Behavior of Hybrid Fixed-Point Cells Constructed at INRIM

2014

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Hybrid cells with double carbon/carbon sheets are used at the Istituto Nazionale di Ricerca Metrologica (INRIM) for the realization of both pure metal fixed points and high-temperature metal-carbon eutectic points. Cells for the Cu and Co-C fixed points have been prepared to be used in the high-temperature fixed-point project of the Comité Consultatif de Thermométrie. The results of the evaluation processes were not completely satisfactory for the INRIM cells because of their low transition temperatures with respect to the best cells, and of a rather large melting range for the Co-C cell. A new design of the cells was devised, and considerable improvements were achieved with respect to the transition temperature, and the plateau shape and duration. As for the Cu point, the duration of the freezing plateaux increased by more than 50 % and the freezing temperature increased by 18 mK. As for the Co-C point, the melting temperature, expressed in terms of the point of inflection of the melting curve, increased by about 70 mK. The melting range of the plateaux, expressed as a difference (T liquidus − T solid ) was reduced from about 180 mK to about 130 mK, with melting times (t liquidus − t solid ) increased by about 50 %, as a consequence of an improvement of flatness and run-off of the plateaux.

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Indirect determination of the thermodynamic temperature of the copper point by a multi-fixed-point technique

Cited by 7 publications

References 15 publications

Indirect Determination of the Thermodynamic Temperature of a Gold Fixed-Point Cell

Indirect Determination of the Thermodynamic Temperature of a Gold Fixed-Point Cell

Co–C and Pd–C Fixed Points for the Evaluation of Facilities and Scales Realization at INRIM and NMC

Influence of the Cavity Length on the Behavior of Hybrid Fixed-Point Cells Constructed at INRIM

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