Uncertainty Budgets for Realization of ITS-90 by Radiation Thermometry

Fischer, Joachim; Battuello, M.; Sadli, M.; Ballico, Mark; Park, Seung-Nam; Saunders, Peter M.; Yuan, Z.; Johnson, Bettye C.; Ham, Eric; Sakuma, F; Machin, G.; Fox, Nigel; Li, Wang; Uğur, S.; Matveyev, M.

doi:10.1063/1.1627198

Cited by 42 publications

(47 citation statements)

References 1 publication

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“…When the CCT K5 Final Report is available, the review protocol will be updated accordingly. An additional scrutiny criterion is the existence of an uncertainty budget with evidence that the budget follows Table C of [7] for t > 960 • C. The CCT WG8 accepted this CMC review protocol in December 2003.…”

Section: Radiation Thermometer Cmc Review Protocolmentioning

confidence: 99%

“…The review protocol provides three-tier cutoff values for determining whether no review, an RMO-level review, or a CCT WG8-level review is necessary. The cutoff values were determined from the arithmetic mean of the normal and best uncertainty (k = 2) values from CCT WG5, a published document for Service Category 2.5.4, and the TRIRAT comparison uncertainty (k = 2) values [7][8][9]. The review protocol does not use CCT K5 comparison values due to the fact that the CCT K5 NMI uncertainty values were not available at the time of the review protocol creation.…”

Section: Radiation Thermometer Cmc Review Protocolmentioning

confidence: 99%

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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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Section: Radiation Thermometer Cmc Review Protocolmentioning

confidence: 99%

Section: Radiation Thermometer Cmc Review Protocolmentioning

confidence: 99%

CCT WG8 CMC Review Protocols: Development and Implementation

et al. 2008

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“…Temperature measurements of the LgAu1 and SmAu cells were also performed in 1991 where the differences in temperature were 32 mK (k = 2) (Charles Gibson, Personal communication). These measurements can also be examined with respect to the uncertainty budget of fixed-point measurements listed by the CCT-WG5 for ITS-90 fixed points [6]. The items in the uncertainty budget are grouped according to those associated with the fixed-point transition and those associated with the operation of the radiation thermometer.…”

Section: Discussionmentioning

confidence: 99%

Radiometric Temperature Comparisons of Three NIST Gold Freezing-Point Blackbodies

Sasajima¹,

Gibson

Khromchenko

et al. 2011

Int J Thermophys

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Radiometric temperature comparisons of three NIST gold freezingtemperature blackbodies are described. The blackbodies are used in different facilities with different furnaces for the radiance temperature and spectral radiance scales, and the comparisons are needed to determine the equivalence of the gold-point based realizations. The temperatures of each gold-point blackbody are compared against each other using a detector-based radiation thermometer which is calibrated using the cryogenic electrical substitution radiometer. These measurements were performed over a month period in 2004 and compared to the previous measurements of two of the same blackbodies in 1991. The freezing temperatures of all three blackbodies are found to be in agreement to <10 mK (k = 2), and the differences are within the comparison uncertainties. These differences are in agreement, within the combined uncertainties, with the <16 mK (k = 1) differences found in 1991.

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“…Previously [or "traditionally"], Eq. 1 has been used to estimate the temperature drop in uncertainty calculations [7], and this contribution may need to be revised to lower values to take into account the influence of the surroundings. From these calculations estimates of the correction for the temperature drop for this design of an HTFP blackbody can be made.…”

Section: Furnace Conditionsmentioning

confidence: 99%

Calculation of the Temperature Drop for High-Temperature Fixed Points for Different Furnace Conditions

et al. 2011

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High-temperature fixed points (HTFPs) based on eutectic and peritectic reactions of metals and carbon are likely to become, in the near term, reference standards at high temperatures. Typically for radiation thermometry applications, these HTFPs are generally formed of a graphite crucible, with a reentrant well, an included 120 • cone, and a nominal aperture of 3 mm. It is important to quantify the temperature drop at the back wall of the cavity, and to understand the influence of the crucible configuration and furnace conditions on this drop. In order to study these influences, three different situations have been modeled by means of the finite volume method for numerical analysis. The first investigates the influence of the furnace temperature profile on the temperature drop by simulating four different furnace conditions. The other two study variations in the crucible configuration, namely, the thickness of the graphite back wall and the length of the blackbody tube.

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Uncertainty Budgets for Realization of ITS-90 by Radiation Thermometry

Cited by 42 publications

References 1 publication

CCT WG8 CMC Review Protocols: Development and Implementation

CCT WG8 CMC Review Protocols: Development and Implementation

Radiometric Temperature Comparisons of Three NIST Gold Freezing-Point Blackbodies

Calculation of the Temperature Drop for High-Temperature Fixed Points for Different Furnace Conditions

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