Current progress in the INRiM experiment for the determination of the Boltzmann constant k (B) by means of acoustic thermometry is reported. Particularly, the microwave determination of the volume of a triaxial ellipsoidal resonator with an inner radius of 5 cm which was designed at LNE-CNAM is discussed. For the same cavity, acoustic measurements in helium at T (w) over the extended pressure range between 50 kPa and 1.4 MPa are reported and these results are compared with the predictions of a model which accounts for several perturbing effects. The procedures, methods, and results obtained in the calibration of several capsule-type SPRTs used in the experiment are briefly illustrated, together with the estimate of the temperature uniformity of the experiment.
Progress in INRiM Experiment for the Determination of the Boltzmann Constant with a Quasi-spherical Resonator / Gavioso, Roberto; Benedetto, G.; Madonna Ripa, D.; Giuliano Albo, P. A.; Guianvarc’H, C.; Merlone, A; Pitre, L.; Truong, D.; Moro, F.; Cuccaro, R.. - In: INTERNATIONAL JOURNAL OF THERMOPHYSICS. - ISSN 0195-928X. - 32:7(2011), pp. 1339-1354. [10.1007/s10765-011-1032-9]
Progress in INRiM Experiment for the Determination of the Boltzmann Constant with a Quasi-spherical Resonator
Gavioso, Roberto;Madonna Ripa, D.;Giuliano Albo, P. A.;Merlone, A;Cuccaro, R.
2011
Abstract
Current progress in the INRiM experiment for the determination of the Boltzmann constant k (B) by means of acoustic thermometry is reported. Particularly, the microwave determination of the volume of a triaxial ellipsoidal resonator with an inner radius of 5 cm which was designed at LNE-CNAM is discussed. For the same cavity, acoustic measurements in helium at T (w) over the extended pressure range between 50 kPa and 1.4 MPa are reported and these results are compared with the predictions of a model which accounts for several perturbing effects. The procedures, methods, and results obtained in the calibration of several capsule-type SPRTs used in the experiment are briefly illustrated, together with the estimate of the temperature uniformity of the experiment.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
