Acoustic measurements of the thermodynamic temperature between the triple point of mercury and 380 K

Benedetto, G.; Gavioso, R. M.; Spagnolo, R.; Marcarino, P.; Merlone, A.

doi:10.1088/0026-1394/41/1/011

Cited by 77 publications

(115 citation statements)

References 36 publications

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“…They also modeled shells with spherical inner surfaces and outer surfaces that had large bosses and/or flanges similar to those on the resonators used for acoustic thermometry. [5,6,7,8,9] Consistent with the observations of Pitre et al and Gavioso et al, the models predict that radial acoustic modes do couple to non-radial shell modes when the spherical symmetry is broken, either by the shape of the outer surface or by a stiff support. Optimizing an acoustic resonator to measure k B will minimize its departures from spherical symmetry.…”

Section: Coupling Between Gas Modes and Shell Vibrationssupporting

confidence: 78%

“…In contrast with Ripple et al, Pitre et al [8] and, independently, Benedetto et al [7] used ducts with lengths equal to their respective cavities' radii a. These ducts led from the cavities to the volume inside pressure vessels surrounding the cavities.…”

Section: Ducts That Admit Gas Into a Cavitymentioning

confidence: 99%

“…[28] (A crevice will increase Δg/f.) Because, the zero-pressure limits of Δg/f in [7] and [8] were independent of temperature for each mode, the acoustic thermometry was successful. (In [8] the same limits were found for helium and argon.)…”

Section: Ducts That Admit Gas Into a Cavitymentioning

confidence: 99%

“…[4] This article reviews the advances in both understanding and technique that have occurred since the work of Quinn et al and Moldover et al Nearly all of these advances were introduced to reduce the uncertainty and complexity of primary acoustic thermometry at temperatures that extend well above and well below T TPW . [5,6,7,8,9] Because primary acoustic thermometry requires the accurate measurement of the zero-pressure limit of speed-of-sound ratios for pure monatomic gases, many thermometry-motivated improvements are applicable to acoustic determinations of k B . Such improvements include:…”

Section: Introductionmentioning

confidence: 99%

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Optimizing acoustic measurements of the Boltzmann constant

Moldover

2009

Comptes Rendus. Physique

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We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant R using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophysical properties of helium ab initio suggest that today one could determine Boltzmann's constant k B from acoustic measurements using either helium or argon with a relative uncertainty less than 10 −6 . RésuméProgrès dans la détermination de la constante de Boltzmann par voie acoustique L'article récapitule les avancées effectuées en métrologie acoustique dans les gaz depuis la mesure de la constante universelle des gaz R effectuée en 1988 en utilisant un résonateur acoustique sphérique. Des progrès substantiels ont été réalisés, tant pour mieux comprendre le fonctionnement des résonateurs acoustiques que pour calculer ab initio, avec une fiabilité accrue, les caractéristiques thermo-physiques de l'hélium. Ils permettent d'envisager désormais une détermination de la constante de Boltzmann k B par voie acoustique avec une incertitude relative meilleure que 10 -6 , en utilisant soit l'argon, soit l'hélium.________________________________ 1. Introduction.

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Section: Coupling Between Gas Modes and Shell Vibrationssupporting

confidence: 78%

Section: Ducts That Admit Gas Into a Cavitymentioning

confidence: 99%

Section: Ducts That Admit Gas Into a Cavitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing acoustic measurements of the Boltzmann constant

Moldover

2009

Comptes Rendus. Physique

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“…This experimental technique allows the measurement of the thermal expansion of spherical cavities in acoustic thermometry, and has successfully been applied in several experiments [14][15][16][17][18][19]. The radius a(p, T TPW ) of the cavity can be obtained using…”

Section: Principle Of Measurementmentioning

confidence: 99%

Determination of the Boltzmann constant using a quasi-spherical acoustic resonator

Pitre

Sparasci

Truong

et al. 2011

Phil. Trans. R. Soc. A.

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The paper reports a new experiment to determine the value of the Boltzmann constant, k B = 1.3806477(17) × 10 −23 J K −1 , with a relative standard uncertainty of 1.2 parts in 10 6 . k B was deduced from measurements of the velocity of sound in argon, inside a closed quasispherical cavity at a temperature of the triple point of water. The shape of the cavity was achieved using an extremely accurate diamond turning process. The traceability of temperature measurements was ensured at the highest level of accuracy. The volume of the resonator was calculated from measurements of the resonance frequencies of microwave modes. The molar mass of the gas was determined by chemical and isotopic composition measurements with a mass spectrometer. Within combined uncertainties, our new value of k B is consistent with the 2006 Committee on Data for Science and Technology (CODATA) value: (k new B /k B_CODATA − 1) = −1.96 × 10 −6 , where the relative uncertainties are u r (k new B ) = 1.2 × 10 −6 and u r (k B_CODATA ) = 1.7 × 10 −6 . The new relative uncertainty approaches the target value of 1 × 10 −6 set by the Consultative Committee on Thermometry as a precondition for redefining the unit of the thermodynamic temperature, the kelvin.

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Temperature Measurement

Fischer

2009

Digital Encyclopedia of Applied Physics

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Accurate measurement and control of temperature is important in many areas such as in the process industry and for the characterisation of materials used in the automotive, aerospace and semiconductor industries. This contribution reviews the current status of temperature measurement. It starts after a brief introduction on the idea of temperature with the description of the main fundamental methods to measure it concentrating on the temperature range important for applications. Different variants of gas thermometry, noise thermometry and the optical methods applying Doppler‐broadening spectroscopy and thermal radiation measurement are reported. The presently adopted international temperature scales to harmonize and facilitate practical temperature measurement are following including the most frequently used practical thermometers such as resistance thermometers, thermocouples and radiation thermometers. New developments like standards based on metal‐carbon eutectic phase transitions and the proposed new definition of the Kelvin based on a fundamental constant conclude the overview.

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Acoustic measurements of the thermodynamic temperature between the triple point of mercury and 380 K

Cited by 77 publications

References 36 publications

Optimizing acoustic measurements of the Boltzmann constant

Optimizing acoustic measurements of the Boltzmann constant

Determination of the Boltzmann constant using a quasi-spherical acoustic resonator

Temperature Measurement

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